aarch64: Fine-grained ldp and stp policies with test-cases.
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| Context |
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| linaro-tcwg-bot/tcwg_gcc_build--master-arm |
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|
Testing passed
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| linaro-tcwg-bot/tcwg_gcc_build--master-aarch64 |
success
|
Testing passed
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| linaro-tcwg-bot/tcwg_gcc_check--master-arm |
success
|
Testing passed
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| linaro-tcwg-bot/tcwg_gcc_check--master-aarch64 |
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|
Testing failed
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Commit Message
This patch implements the following TODO in gcc/config/aarch64/aarch64.cc
to provide the requested behaviour for handling ldp and stp:
/* Allow the tuning structure to disable LDP instruction formation
from combining instructions (e.g., in peephole2).
TODO: Implement fine-grained tuning control for LDP and STP:
1. control policies for load and store separately;
2. support the following policies:
- default (use what is in the tuning structure)
- always
- never
- aligned (only if the compiler can prove that the
load will be aligned to 2 * element_size) */
It provides two new and concrete command-line options -mldp-policy and -mstp-policy
to give the ability to control load and store policies seperately as
stated in part 1 of the TODO.
The accepted values for both options are:
- default: Use the ldp/stp policy defined in the corresponding tuning
structure.
- always: Emit ldp/stp regardless of alignment.
- never: Do not emit ldp/stp.
- aligned: In order to emit ldp/stp, first check if the load/store will
be aligned to 2 * element_size.
gcc/ChangeLog:
* config/aarch64/aarch64-protos.h (struct tune_params): Add
appropriate enums for the policies.
* config/aarch64/aarch64-tuning-flags.def
(AARCH64_EXTRA_TUNING_OPTION): Remove superseded tuning
options.
* config/aarch64/aarch64.cc (aarch64_parse_ldp_policy): New
function to parse ldp-policy option.
(aarch64_parse_stp_policy): New function to parse stp-policy option.
(aarch64_override_options_internal): Call parsing functions.
(aarch64_operands_ok_for_ldpstp): Add option-value check and
alignment check and remove superseded ones
(aarch64_operands_adjust_ok_for_ldpstp): Add option-value check and
alignment check and remove superseded ones.
* config/aarch64/aarch64.opt: Add options.
gcc/testsuite/ChangeLog:
* gcc.target/aarch64/ldp_aligned.c: New test.
* gcc.target/aarch64/ldp_always.c: New test.
* gcc.target/aarch64/ldp_never.c: New test.
* gcc.target/aarch64/stp_aligned.c: New test.
* gcc.target/aarch64/stp_always.c: New test.
* gcc.target/aarch64/stp_never.c: New test.
Signed-off-by: Manos Anagnostakis <manos.anagnostakis@vrull.eu>
---
gcc/config/aarch64/aarch64-protos.h | 24 ++
gcc/config/aarch64/aarch64-tuning-flags.def | 8 -
gcc/config/aarch64/aarch64.cc | 229 ++++++++++++++----
gcc/config/aarch64/aarch64.opt | 8 +
.../gcc.target/aarch64/ldp_aligned.c | 64 +++++
gcc/testsuite/gcc.target/aarch64/ldp_always.c | 64 +++++
gcc/testsuite/gcc.target/aarch64/ldp_never.c | 64 +++++
.../gcc.target/aarch64/stp_aligned.c | 60 +++++
gcc/testsuite/gcc.target/aarch64/stp_always.c | 60 +++++
gcc/testsuite/gcc.target/aarch64/stp_never.c | 60 +++++
10 files changed, 580 insertions(+), 61 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_always.c
create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_never.c
create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_aligned.c
create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_always.c
create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_never.c
Comments
Hi Manos,
Apologies for the long delay.
> -----Original Message-----
> From: Manos Anagnostakis <manos.anagnostakis@vrull.eu>
> Sent: Friday, August 18, 2023 8:50 AM
> To: gcc-patches@gcc.gnu.org
> Cc: Kyrylo Tkachov <Kyrylo.Tkachov@arm.com>; Philipp Tomsich
> <philipp.tomsich@vrull.eu>; Manos Anagnostakis
> <manos.anagnostakis@vrull.eu>
> Subject: [PATCH] aarch64: Fine-grained ldp and stp policies with test-cases.
>
> This patch implements the following TODO in gcc/config/aarch64/aarch64.cc
> to provide the requested behaviour for handling ldp and stp:
>
> /* Allow the tuning structure to disable LDP instruction formation
> from combining instructions (e.g., in peephole2).
> TODO: Implement fine-grained tuning control for LDP and STP:
> 1. control policies for load and store separately;
> 2. support the following policies:
> - default (use what is in the tuning structure)
> - always
> - never
> - aligned (only if the compiler can prove that the
> load will be aligned to 2 * element_size) */
>
> It provides two new and concrete command-line options -mldp-policy and -
> mstp-policy
> to give the ability to control load and store policies seperately as
> stated in part 1 of the TODO.
>
> The accepted values for both options are:
> - default: Use the ldp/stp policy defined in the corresponding tuning
> structure.
> - always: Emit ldp/stp regardless of alignment.
> - never: Do not emit ldp/stp.
> - aligned: In order to emit ldp/stp, first check if the load/store will
> be aligned to 2 * element_size.
>
> gcc/ChangeLog:
> * config/aarch64/aarch64-protos.h (struct tune_params): Add
> appropriate enums for the policies.
> * config/aarch64/aarch64-tuning-flags.def
> (AARCH64_EXTRA_TUNING_OPTION): Remove superseded tuning
> options.
> * config/aarch64/aarch64.cc (aarch64_parse_ldp_policy): New
> function to parse ldp-policy option.
> (aarch64_parse_stp_policy): New function to parse stp-policy option.
> (aarch64_override_options_internal): Call parsing functions.
> (aarch64_operands_ok_for_ldpstp): Add option-value check and
> alignment check and remove superseded ones
> (aarch64_operands_adjust_ok_for_ldpstp): Add option-value check and
> alignment check and remove superseded ones.
> * config/aarch64/aarch64.opt: Add options.
>
> gcc/testsuite/ChangeLog:
> * gcc.target/aarch64/ldp_aligned.c: New test.
> * gcc.target/aarch64/ldp_always.c: New test.
> * gcc.target/aarch64/ldp_never.c: New test.
> * gcc.target/aarch64/stp_aligned.c: New test.
> * gcc.target/aarch64/stp_always.c: New test.
> * gcc.target/aarch64/stp_never.c: New test.
>
> Signed-off-by: Manos Anagnostakis <manos.anagnostakis@vrull.eu>
> ---
>
> gcc/config/aarch64/aarch64-protos.h | 24 ++
> gcc/config/aarch64/aarch64-tuning-flags.def | 8 -
> gcc/config/aarch64/aarch64.cc | 229 ++++++++++++++----
> gcc/config/aarch64/aarch64.opt | 8 +
> .../gcc.target/aarch64/ldp_aligned.c | 64 +++++
> gcc/testsuite/gcc.target/aarch64/ldp_always.c | 64 +++++
> gcc/testsuite/gcc.target/aarch64/ldp_never.c | 64 +++++
> .../gcc.target/aarch64/stp_aligned.c | 60 +++++
> gcc/testsuite/gcc.target/aarch64/stp_always.c | 60 +++++
> gcc/testsuite/gcc.target/aarch64/stp_never.c | 60 +++++
> 10 files changed, 580 insertions(+), 61 deletions(-)
> create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
> create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_always.c
> create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_never.c
> create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_aligned.c
> create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_always.c
> create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_never.c
>
> diff --git a/gcc/config/aarch64/aarch64-protos.h
> b/gcc/config/aarch64/aarch64-protos.h
> index 70303d6fd95..be1d73490ed 100644
> --- a/gcc/config/aarch64/aarch64-protos.h
> +++ b/gcc/config/aarch64/aarch64-protos.h
> @@ -568,6 +568,30 @@ struct tune_params
> /* Place prefetch struct pointer at the end to enable type checking
> errors when tune_params misses elements (e.g., from erroneous merges).
> */
> const struct cpu_prefetch_tune *prefetch;
> +/* An enum specifying how to handle load pairs using a fine-grained policy:
> + - LDP_POLICY_ALIGNED: Emit ldp if the source pointer is aligned
> + to at least double the alignment of the type.
> + - LDP_POLICY_ALWAYS: Emit ldp regardless of alignment.
> + - LDP_POLICY_NEVER: Do not emit ldp. */
> +
> + enum aarch64_ldp_policy_model
> + {
> + LDP_POLICY_ALIGNED,
> + LDP_POLICY_ALWAYS,
> + LDP_POLICY_NEVER
> + } ldp_policy_model;
> +/* An enum specifying how to handle store pairs using a fine-grained policy:
> + - STP_POLICY_ALIGNED: Emit stp if the source pointer is aligned
> + to at least double the alignment of the type.
> + - STP_POLICY_ALWAYS: Emit stp regardless of alignment.
> + - STP_POLICY_NEVER: Do not emit stp. */
> +
> + enum aarch64_stp_policy_model
> + {
> + STP_POLICY_ALIGNED,
> + STP_POLICY_ALWAYS,
> + STP_POLICY_NEVER
> + } stp_policy_model;
> };
>
> /* Classifies an address.
> diff --git a/gcc/config/aarch64/aarch64-tuning-flags.def
> b/gcc/config/aarch64/aarch64-tuning-flags.def
> index 52112ba7c48..774568e9106 100644
> --- a/gcc/config/aarch64/aarch64-tuning-flags.def
> +++ b/gcc/config/aarch64/aarch64-tuning-flags.def
> @@ -30,11 +30,6 @@
>
> AARCH64_EXTRA_TUNING_OPTION ("rename_fma_regs",
> RENAME_FMA_REGS)
>
> -/* Don't create non-8 byte aligned load/store pair. That is if the
> -two load/stores are not at least 8 byte aligned don't create load/store
> -pairs. */
> -AARCH64_EXTRA_TUNING_OPTION ("slow_unaligned_ldpw",
> SLOW_UNALIGNED_LDPW)
> -
> /* Some of the optional shift to some arthematic instructions are
> considered cheap. Logical shift left <=4 with or without a
> zero extend are considered cheap. Sign extend; non logical shift left
> @@ -44,9 +39,6 @@ AARCH64_EXTRA_TUNING_OPTION
> ("cheap_shift_extend", CHEAP_SHIFT_EXTEND)
> /* Disallow load/store pair instructions on Q-registers. */
> AARCH64_EXTRA_TUNING_OPTION ("no_ldp_stp_qregs",
> NO_LDP_STP_QREGS)
>
> -/* Disallow load-pair instructions to be formed in combine/peephole. */
> -AARCH64_EXTRA_TUNING_OPTION ("no_ldp_combine", NO_LDP_COMBINE)
> -
> AARCH64_EXTRA_TUNING_OPTION ("rename_load_regs",
> RENAME_LOAD_REGS)
>
> AARCH64_EXTRA_TUNING_OPTION ("cse_sve_vl_constants",
> CSE_SVE_VL_CONSTANTS)
> diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
> index 560e5431636..51c94804f12 100644
> --- a/gcc/config/aarch64/aarch64.cc
> +++ b/gcc/config/aarch64/aarch64.cc
> @@ -1356,7 +1356,9 @@ static const struct tune_params generic_tunings =
> Neoverse V1. It does not have a noticeable effect on A64FX and should
> have at most a very minor effect on SVE2 cores. */
> (AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params cortexa35_tunings =
> @@ -1390,7 +1392,9 @@ static const struct tune_params cortexa35_tunings
> =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params cortexa53_tunings =
> @@ -1424,7 +1428,9 @@ static const struct tune_params cortexa53_tunings
> =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params cortexa57_tunings =
> @@ -1458,7 +1464,9 @@ static const struct tune_params cortexa57_tunings
> =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_RENAME_FMA_REGS), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params cortexa72_tunings =
> @@ -1492,7 +1500,9 @@ static const struct tune_params cortexa72_tunings
> =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params cortexa73_tunings =
> @@ -1526,7 +1536,9 @@ static const struct tune_params cortexa73_tunings
> =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
>
> @@ -1561,7 +1573,9 @@ static const struct tune_params exynosm1_tunings
> =
> 48, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &exynosm1_prefetch_tune
> + &exynosm1_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params thunderxt88_tunings =
> @@ -1593,8 +1607,10 @@ static const struct tune_params
> thunderxt88_tunings =
> 2, /* min_div_recip_mul_df. */
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
> - (AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW), /* tune_flags. */
> - &thunderxt88_prefetch_tune
> + (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> + &thunderxt88_prefetch_tune,
> + tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
> };
>
> static const struct tune_params thunderx_tunings =
> @@ -1626,9 +1642,10 @@ static const struct tune_params thunderx_tunings
> =
> 2, /* min_div_recip_mul_df. */
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
> - (AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW
> - | AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
> - &thunderx_prefetch_tune
> + (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
> + &thunderx_prefetch_tune,
> + tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
> };
>
> static const struct tune_params tsv110_tunings =
> @@ -1662,7 +1679,9 @@ static const struct tune_params tsv110_tunings =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &tsv110_prefetch_tune
> + &tsv110_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params xgene1_tunings =
> @@ -1695,7 +1714,9 @@ static const struct tune_params xgene1_tunings =
> 17, /* max_case_values. */
> tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NO_LDP_STP_QREGS), /* tune_flags. */
> - &xgene1_prefetch_tune
> + &xgene1_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params emag_tunings =
> @@ -1728,7 +1749,9 @@ static const struct tune_params emag_tunings =
> 17, /* max_case_values. */
> tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NO_LDP_STP_QREGS), /* tune_flags. */
> - &xgene1_prefetch_tune
> + &xgene1_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params qdf24xx_tunings =
> @@ -1762,7 +1785,9 @@ static const struct tune_params qdf24xx_tunings =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> AARCH64_EXTRA_TUNE_RENAME_LOAD_REGS, /* tune_flags. */
> - &qdf24xx_prefetch_tune
> + &qdf24xx_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> /* Tuning structure for the Qualcomm Saphira core. Default to falkor values
> @@ -1798,7 +1823,9 @@ static const struct tune_params saphira_tunings =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params thunderx2t99_tunings =
> @@ -1832,7 +1859,9 @@ static const struct tune_params
> thunderx2t99_tunings =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &thunderx2t99_prefetch_tune
> + &thunderx2t99_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params thunderx3t110_tunings =
> @@ -1866,7 +1895,9 @@ static const struct tune_params
> thunderx3t110_tunings =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &thunderx3t110_prefetch_tune
> + &thunderx3t110_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params neoversen1_tunings =
> @@ -1899,7 +1930,9 @@ static const struct tune_params
> neoversen1_tunings =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params ampere1_tunings =
> @@ -1935,8 +1968,10 @@ static const struct tune_params ampere1_tunings
> =
> 2, /* min_div_recip_mul_df. */
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> - (AARCH64_EXTRA_TUNE_NO_LDP_COMBINE), /* tune_flags. */
> - &ere1_prefetch_tune
> + (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> + &ere1_prefetch_tune,
> + tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
> };
>
> static const struct tune_params ampere1a_tunings =
> @@ -1973,8 +2008,10 @@ static const struct tune_params ampere1a_tunings
> =
> 2, /* min_div_recip_mul_df. */
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> - (AARCH64_EXTRA_TUNE_NO_LDP_COMBINE), /* tune_flags. */
> - &ere1_prefetch_tune
> + (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> + &ere1_prefetch_tune,
> + tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
> };
>
> static const advsimd_vec_cost neoversev1_advsimd_vector_cost =
> @@ -2155,7 +2192,9 @@ static const struct tune_params
> neoversev1_tunings =
> | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
> | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
> | AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const sve_vec_cost neoverse512tvb_sve_vector_cost =
> @@ -2292,7 +2331,9 @@ static const struct tune_params
> neoverse512tvb_tunings =
> (AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
> | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
> | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /*
> tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const advsimd_vec_cost neoversen2_advsimd_vector_cost =
> @@ -2482,7 +2523,9 @@ static const struct tune_params
> neoversen2_tunings =
> | AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
> | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
> | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /*
> tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const advsimd_vec_cost neoversev2_advsimd_vector_cost =
> @@ -2672,7 +2715,9 @@ static const struct tune_params
> neoversev2_tunings =
> | AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
> | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
> | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /*
> tune_flags. */
> - &generic_prefetch_tune
> + &generic_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> static const struct tune_params a64fx_tunings =
> @@ -2705,7 +2750,9 @@ static const struct tune_params a64fx_tunings =
> 0, /* max_case_values. */
> tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> - &a64fx_prefetch_tune
> + &a64fx_prefetch_tune,
> + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> };
>
> /* Support for fine-grained override of the tuning structures. */
> @@ -17645,6 +17692,50 @@ aarch64_parse_tune (const char *to_parse,
> const struct processor **res)
> return AARCH_PARSE_INVALID_ARG;
> }
>
> +/* Validate a command-line -mldp-policy option. Parse the policy
> + specified in STR and throw errors if appropriate. */
> +
> +static bool
> +aarch64_parse_ldp_policy (const char *str, struct tune_params* tune)
> +{
> + /* Check the value of the option to be one of the accepted. */
> + if (strcmp (str, "always") == 0)
> + tune->ldp_policy_model = tune_params::LDP_POLICY_ALWAYS;
> + else if (strcmp (str, "never") == 0)
> + tune->ldp_policy_model = tune_params::LDP_POLICY_NEVER;
> + else if (strcmp (str, "aligned") == 0)
> + tune->ldp_policy_model = tune_params::LDP_POLICY_ALIGNED;
> + else if (strcmp (str, "default") != 0)
> + {
> + error ("unknown value %qs for %<-mldp-policy%>", str);
> + return false;
> + }
> +
> + return true;
> +}
> +
> +/* Validate a command-line -mstp-policy option. Parse the policy
> + specified in STR and throw errors if appropriate. */
> +
> +static bool
> +aarch64_parse_stp_policy (const char *str, struct tune_params* tune)
> +{
> + /* Check the value of the option to be one of the accepted. */
> + if (strcmp (str, "always") == 0)
> + tune->stp_policy_model = tune_params::STP_POLICY_ALWAYS;
> + else if (strcmp (str, "never") == 0)
> + tune->stp_policy_model = tune_params::STP_POLICY_NEVER;
> + else if (strcmp (str, "aligned") == 0)
> + tune->stp_policy_model = tune_params::STP_POLICY_ALIGNED;
> + else if (strcmp (str, "default") != 0)
> + {
> + error ("unknown value %qs for %<-mstp-policy%>", str);
> + return false;
> + }
> +
> + return true;
> +}
> +
> /* Parse TOKEN, which has length LENGTH to see if it is an option
> described in FLAG. If it is, return the index bit for that fusion type.
> If not, error (printing OPTION_NAME) and return zero. */
> @@ -17993,6 +18084,14 @@ aarch64_override_options_internal (struct
> gcc_options *opts)
> aarch64_parse_override_string (opts->x_aarch64_override_tune_string,
> &aarch64_tune_params);
>
> + if (opts->x_aarch64_ldp_policy_string)
> + aarch64_parse_ldp_policy (opts->x_aarch64_ldp_policy_string,
> + &aarch64_tune_params);
> +
> + if (opts->x_aarch64_stp_policy_string)
> + aarch64_parse_stp_policy (opts->x_aarch64_stp_policy_string,
> + &aarch64_tune_params);
> +
> /* This target defaults to strict volatile bitfields. */
> if (opts->x_flag_strict_volatile_bitfields < 0 && abi_version_at_least (2))
> opts->x_flag_strict_volatile_bitfields = 1;
> @@ -26301,18 +26400,14 @@ aarch64_operands_ok_for_ldpstp (rtx
> *operands, bool load,
> enum reg_class rclass_1, rclass_2;
> rtx mem_1, mem_2, reg_1, reg_2;
>
> - /* Allow the tuning structure to disable LDP instruction formation
> - from combining instructions (e.g., in peephole2).
> - TODO: Implement fine-grained tuning control for LDP and STP:
> - 1. control policies for load and store separately;
> - 2. support the following policies:
> - - default (use what is in the tuning structure)
> - - always
> - - never
> - - aligned (only if the compiler can prove that the
> - load will be aligned to 2 * element_size) */
> - if (load && (aarch64_tune_params.extra_tuning_flags
> - & AARCH64_EXTRA_TUNE_NO_LDP_COMBINE))
> + /* If we have LDP_POLICY_NEVER, reject the load pair. */
> + if (load
> + && aarch64_tune_params.ldp_policy_model ==
> tune_params::LDP_POLICY_NEVER)
> + return false;
> +
> + /* If we have STP_POLICY_NEVER, reject the store pair. */
> + if (!load
> + && aarch64_tune_params.stp_policy_model ==
> tune_params::STP_POLICY_NEVER)
> return false;
>
> if (load)
> @@ -26339,13 +26434,22 @@ aarch64_operands_ok_for_ldpstp (rtx
> *operands, bool load,
> if (MEM_VOLATILE_P (mem_1) || MEM_VOLATILE_P (mem_2))
> return false;
>
> - /* If we have SImode and slow unaligned ldp,
> - check the alignment to be at least 8 byte. */
> - if (mode == SImode
> - && (aarch64_tune_params.extra_tuning_flags
> - & AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW)
> + /* If we have LDP_POLICY_ALIGNED,
> + do not emit the load pair unless the alignment is checked to be
> + at least double the alignment of the type. */
> + if (load
> + && aarch64_tune_params.ldp_policy_model ==
> tune_params::LDP_POLICY_ALIGNED
> && !optimize_size
> - && MEM_ALIGN (mem_1) < 8 * BITS_PER_UNIT)
> + && MEM_ALIGN (mem_1) < 2 * GET_MODE_ALIGNMENT (mode))
> + return false;
> +
> + /* If we have STP_POLICY_ALIGNED,
> + do not emit the store pair unless the alignment is checked to be
> + at least double the alignment of the type. */
> + if (!load
> + && aarch64_tune_params.stp_policy_model ==
> tune_params::STP_POLICY_ALIGNED
> + && !optimize_size
> + && MEM_ALIGN (mem_1) < 2 * GET_MODE_ALIGNMENT (mode))
> return false;
I appreciate there is an existing use of optimize_size above, but the recommended way of checking this is optimize_function_for_size_p (cfun)
>
> /* Check if the addresses are in the form of [base+offset]. */
> @@ -26475,6 +26579,16 @@ aarch64_operands_adjust_ok_for_ldpstp (rtx
> *operands, bool load,
> HOST_WIDE_INT offvals[num_insns], msize;
> rtx mem[num_insns], reg[num_insns], base[num_insns],
> offset[num_insns];
>
> + /* If we have LDP_POLICY_NEVER, reject the load pair. */
> + if (load
> + && aarch64_tune_params.ldp_policy_model ==
> tune_params::LDP_POLICY_NEVER)
> + return false;
> +
> + /* If we have STP_POLICY_NEVER, reject the store pair. */
> + if (!load
> + && aarch64_tune_params.stp_policy_model ==
> tune_params::STP_POLICY_NEVER)
> + return false;
> +
> if (load)
> {
> for (int i = 0; i < num_insns; i++)
> @@ -26564,13 +26678,22 @@ aarch64_operands_adjust_ok_for_ldpstp (rtx
> *operands, bool load,
> if (offvals[0] % msize != offvals[2] % msize)
> return false;
>
> - /* If we have SImode and slow unaligned ldp,
> - check the alignment to be at least 8 byte. */
> - if (mode == SImode
> - && (aarch64_tune_params.extra_tuning_flags
> - & AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW)
> + /* If we have LDP_POLICY_ALIGNED,
> + do not emit the load pair unless the alignment is checked to be
> + at least double the alignment of the type. */
> + if (load
> + && aarch64_tune_params.ldp_policy_model ==
> tune_params::LDP_POLICY_ALIGNED
> + && !optimize_size
> + && MEM_ALIGN (mem[0]) < 2 * GET_MODE_ALIGNMENT (mode))
> + return false;
> +
> + /* If we have STP_POLICY_ALIGNED,
> + do not emit the store pair unless the alignment is checked to be
> + at least double the alignment of the type. */
> + if (!load
> + && aarch64_tune_params.stp_policy_model ==
> tune_params::STP_POLICY_ALIGNED
> && !optimize_size
> - && MEM_ALIGN (mem[0]) < 8 * BITS_PER_UNIT)
> + && MEM_ALIGN (mem[0]) < 2 * GET_MODE_ALIGNMENT (mode))
> return false;
>
> return true;
> diff --git a/gcc/config/aarch64/aarch64.opt b/gcc/config/aarch64/aarch64.opt
> index 4a0580435a8..e5302947ce7 100644
> --- a/gcc/config/aarch64/aarch64.opt
> +++ b/gcc/config/aarch64/aarch64.opt
> @@ -205,6 +205,14 @@ msign-return-address=
> Target WarnRemoved RejectNegative Joined Enum(aarch_ra_sign_scope_t)
> Var(aarch_ra_sign_scope) Init(AARCH_FUNCTION_NONE) Save
> Select return address signing scope.
>
> +mldp-policy=
> +Target RejectNegative Joined Var(aarch64_ldp_policy_string) Save
> +Fine-grained policy for load pairs.
> +
> +mstp-policy=
> +Target RejectNegative Joined Var(aarch64_stp_policy_string) Save
> +Fine-grained policy for store pairs.
I'd like to avoid having -m* option for such low-level codegen tweaks. -m* options should be used for options that enable/disable user-visible features, ABI things etc.
We have target-specific params these days so I'd recommend you implement this in a similar way to -param=aarch64-autovec-preference=.
It will have to take a number rather than a string but that should be okay, as long as the right values are documented in invoke.texi.
Otherwise the approach looks good.
Thanks,
Kyrill
> +
> Enum
> Name(aarch_ra_sign_scope_t) Type(enum aarch_function_type)
> Supported AArch64 return address signing scope (for use with -msign-return-
> address= option):
> diff --git a/gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
> b/gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
> new file mode 100644
> index 00000000000..895018f6b53
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
> @@ -0,0 +1,64 @@
> +/* { dg-options "-O3 -mldp-policy=aligned" } */
> +
> +#include <stdlib.h>
> +#include <stdint.h>
> +
> +typedef int v4si __attribute__ ((vector_size (16)));
> +
> +#define LDP_TEST_ALIGNED(TYPE) \
> +TYPE ldp_aligned_##TYPE(char* ptr){ \
> + TYPE a_0, a_1; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + a_0 = arr[0]; \
> + a_1 = arr[1]; \
> + return a_0 + a_1; \
> +}
> +
> +#define LDP_TEST_UNALIGNED(TYPE) \
> +TYPE ldp_unaligned_##TYPE(char* ptr){ \
> + TYPE a_0, a_1; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a_0 = a[0]; \
> + a_1 = a[1]; \
> + return a_0 + a_1; \
> +}
> +
> +#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
> +TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
> + TYPE a_0, a_1, a_2, a_3; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + a_0 = arr[100]; \
> + a_1 = arr[101]; \
> + a_2 = arr[102]; \
> + a_3 = arr[103]; \
> + return a_0 + a_1 + a_2 + a_3; \
> +}
> +
> +#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
> +TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
> + TYPE a_0, a_1, a_2, a_3; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a_0 = a[100]; \
> + a_1 = a[101]; \
> + a_2 = a[102]; \
> + a_3 = a[103]; \
> + return a_0 + a_1 + a_2 + a_3; \
> +}
> +
> +LDP_TEST_ALIGNED(int32_t);
> +LDP_TEST_ALIGNED(int64_t);
> +LDP_TEST_ALIGNED(v4si);
> +LDP_TEST_UNALIGNED(int32_t);
> +LDP_TEST_UNALIGNED(int64_t);
> +LDP_TEST_UNALIGNED(v4si);
> +LDP_TEST_ADJUST_ALIGNED(int32_t);
> +LDP_TEST_ADJUST_ALIGNED(int64_t);
> +LDP_TEST_ADJUST_UNALIGNED(int32_t);
> +LDP_TEST_ADJUST_UNALIGNED(int64_t);
> +
> +/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 3 } } */
> +/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 3 } } */
> +/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 1 } } */
> +
> diff --git a/gcc/testsuite/gcc.target/aarch64/ldp_always.c
> b/gcc/testsuite/gcc.target/aarch64/ldp_always.c
> new file mode 100644
> index 00000000000..ead4fe41891
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/aarch64/ldp_always.c
> @@ -0,0 +1,64 @@
> +/* { dg-options "-O3 -mldp-policy=always" } */
> +
> +#include <stdlib.h>
> +#include <stdint.h>
> +
> +typedef int v4si __attribute__ ((vector_size (16)));
> +
> +#define LDP_TEST_ALIGNED(TYPE) \
> +TYPE ldp_aligned_##TYPE(char* ptr){ \
> + TYPE a_0, a_1; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + a_0 = arr[0]; \
> + a_1 = arr[1]; \
> + return a_0 + a_1; \
> +}
> +
> +#define LDP_TEST_UNALIGNED(TYPE) \
> +TYPE ldp_unaligned_##TYPE(char* ptr){ \
> + TYPE a_0, a_1; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a_0 = a[0]; \
> + a_1 = a[1]; \
> + return a_0 + a_1; \
> +}
> +
> +#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
> +TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
> + TYPE a_0, a_1, a_2, a_3; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + a_0 = arr[100]; \
> + a_1 = arr[101]; \
> + a_2 = arr[102]; \
> + a_3 = arr[103]; \
> + return a_0 + a_1 + a_2 + a_3; \
> +}
> +
> +#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
> +TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
> + TYPE a_0, a_1, a_2, a_3; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a_0 = a[100]; \
> + a_1 = a[101]; \
> + a_2 = a[102]; \
> + a_3 = a[103]; \
> + return a_0 + a_1 + a_2 + a_3; \
> +}
> +
> +LDP_TEST_ALIGNED(int32_t);
> +LDP_TEST_ALIGNED(int64_t);
> +LDP_TEST_ALIGNED(v4si);
> +LDP_TEST_UNALIGNED(int32_t);
> +LDP_TEST_UNALIGNED(int64_t);
> +LDP_TEST_UNALIGNED(v4si);
> +LDP_TEST_ADJUST_ALIGNED(int32_t);
> +LDP_TEST_ADJUST_ALIGNED(int64_t);
> +LDP_TEST_ADJUST_UNALIGNED(int32_t);
> +LDP_TEST_ADJUST_UNALIGNED(int64_t);
> +
> +/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 6 } } */
> +/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 6 } } */
> +/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 2 } } */
> +
> diff --git a/gcc/testsuite/gcc.target/aarch64/ldp_never.c
> b/gcc/testsuite/gcc.target/aarch64/ldp_never.c
> new file mode 100644
> index 00000000000..aae2f087241
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/aarch64/ldp_never.c
> @@ -0,0 +1,64 @@
> +/* { dg-options "-O3 -mldp-policy=never" } */
> +
> +#include <stdlib.h>
> +#include <stdint.h>
> +
> +typedef int v4si __attribute__ ((vector_size (16)));
> +
> +#define LDP_TEST_ALIGNED(TYPE) \
> +TYPE ldp_aligned_##TYPE(char* ptr){ \
> + TYPE a_0, a_1; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + a_0 = arr[0]; \
> + a_1 = arr[1]; \
> + return a_0 + a_1; \
> +}
> +
> +#define LDP_TEST_UNALIGNED(TYPE) \
> +TYPE ldp_unaligned_##TYPE(char* ptr){ \
> + TYPE a_0, a_1; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a_0 = a[0]; \
> + a_1 = a[1]; \
> + return a_0 + a_1; \
> +}
> +
> +#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
> +TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
> + TYPE a_0, a_1, a_2, a_3; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + a_0 = arr[100]; \
> + a_1 = arr[101]; \
> + a_2 = arr[102]; \
> + a_3 = arr[103]; \
> + return a_0 + a_1 + a_2 + a_3; \
> +}
> +
> +#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
> +TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
> + TYPE a_0, a_1, a_2, a_3; \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a_0 = a[100]; \
> + a_1 = a[101]; \
> + a_2 = a[102]; \
> + a_3 = a[103]; \
> + return a_0 + a_1 + a_2 + a_3; \
> +}
> +
> +LDP_TEST_ALIGNED(int32_t);
> +LDP_TEST_ALIGNED(int64_t);
> +LDP_TEST_ALIGNED(v4si);
> +LDP_TEST_UNALIGNED(int32_t);
> +LDP_TEST_UNALIGNED(int64_t);
> +LDP_TEST_UNALIGNED(v4si);
> +LDP_TEST_ADJUST_ALIGNED(int32_t);
> +LDP_TEST_ADJUST_ALIGNED(int64_t);
> +LDP_TEST_ADJUST_UNALIGNED(int32_t);
> +LDP_TEST_ADJUST_UNALIGNED(int64_t);
> +
> +/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 0 } } */
> +/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 0 } } */
> +/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 0 } } */
> +
> diff --git a/gcc/testsuite/gcc.target/aarch64/stp_aligned.c
> b/gcc/testsuite/gcc.target/aarch64/stp_aligned.c
> new file mode 100644
> index 00000000000..07b49629292
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/aarch64/stp_aligned.c
> @@ -0,0 +1,60 @@
> +/* { dg-options "-O3 -mstp-policy=aligned" } */
> +
> +#include <stdlib.h>
> +#include <stdint.h>
> +
> +typedef int v4si __attribute__ ((vector_size (16)));
> +
> +#define STP_TEST_ALIGNED(TYPE) \
> +TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + arr[0] = x; \
> + arr[1] = x; \
> + return arr; \
> +}
> +
> +#define STP_TEST_UNALIGNED(TYPE) \
> +TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a[0] = x; \
> + a[1] = x; \
> + return a; \
> +}
> +
> +#define STP_TEST_ADJUST_ALIGNED(TYPE) \
> +TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + arr[100] = x; \
> + arr[101] = x; \
> + arr[102] = x; \
> + arr[103] = x; \
> + return arr; \
> +}
> +
> +#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
> +TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a[100] = x; \
> + a[101] = x; \
> + a[102] = x; \
> + a[103] = x; \
> + return a; \
> +}
> +
> +STP_TEST_ALIGNED(int32_t);
> +STP_TEST_ALIGNED(int64_t);
> +STP_TEST_ALIGNED(v4si);
> +STP_TEST_UNALIGNED(int32_t);
> +STP_TEST_UNALIGNED(int64_t);
> +STP_TEST_UNALIGNED(v4si);
> +STP_TEST_ADJUST_ALIGNED(int32_t);
> +STP_TEST_ADJUST_ALIGNED(int64_t);
> +STP_TEST_ADJUST_UNALIGNED(int32_t);
> +STP_TEST_ADJUST_UNALIGNED(int64_t);
> +
> +/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 3 } } */
> +/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 3 } } */
> +/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 1 } } */
> +
> diff --git a/gcc/testsuite/gcc.target/aarch64/stp_always.c
> b/gcc/testsuite/gcc.target/aarch64/stp_always.c
> new file mode 100644
> index 00000000000..6a1c671f02c
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/aarch64/stp_always.c
> @@ -0,0 +1,60 @@
> +/* { dg-options "-O3 -mstp-policy=always" } */
> +
> +#include <stdlib.h>
> +#include <stdint.h>
> +
> +typedef int v4si __attribute__ ((vector_size (16)));
> +
> +#define STP_TEST_ALIGNED(TYPE) \
> +TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + arr[0] = x; \
> + arr[1] = x; \
> + return arr; \
> +}
> +
> +#define STP_TEST_UNALIGNED(TYPE) \
> +TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a[0] = x; \
> + a[1] = x; \
> + return a; \
> +}
> +
> +#define STP_TEST_ADJUST_ALIGNED(TYPE) \
> +TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + arr[100] = x; \
> + arr[101] = x; \
> + arr[102] = x; \
> + arr[103] = x; \
> + return arr; \
> +}
> +
> +#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
> +TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a[100] = x; \
> + a[101] = x; \
> + a[102] = x; \
> + a[103] = x; \
> + return a; \
> +}
> +
> +STP_TEST_ALIGNED(int32_t);
> +STP_TEST_ALIGNED(int64_t);
> +STP_TEST_ALIGNED(v4si);
> +STP_TEST_UNALIGNED(int32_t);
> +STP_TEST_UNALIGNED(int64_t);
> +STP_TEST_UNALIGNED(v4si);
> +STP_TEST_ADJUST_ALIGNED(int32_t);
> +STP_TEST_ADJUST_ALIGNED(int64_t);
> +STP_TEST_ADJUST_UNALIGNED(int32_t);
> +STP_TEST_ADJUST_UNALIGNED(int64_t);
> +
> +/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 6 } } */
> +/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 6 } } */
> +/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 2 } } */
> +
> diff --git a/gcc/testsuite/gcc.target/aarch64/stp_never.c
> b/gcc/testsuite/gcc.target/aarch64/stp_never.c
> new file mode 100644
> index 00000000000..9cd703995b7
> --- /dev/null
> +++ b/gcc/testsuite/gcc.target/aarch64/stp_never.c
> @@ -0,0 +1,60 @@
> +/* { dg-options "-O3 -mstp-policy=never" } */
> +
> +#include <stdlib.h>
> +#include <stdint.h>
> +
> +typedef int v4si __attribute__ ((vector_size (16)));
> +
> +#define STP_TEST_ALIGNED(TYPE) \
> +TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + arr[0] = x; \
> + arr[1] = x; \
> + return arr; \
> +}
> +
> +#define STP_TEST_UNALIGNED(TYPE) \
> +TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a[0] = x; \
> + a[1] = x; \
> + return a; \
> +}
> +
> +#define STP_TEST_ADJUST_ALIGNED(TYPE) \
> +TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + arr[100] = x; \
> + arr[101] = x; \
> + arr[102] = x; \
> + arr[103] = x; \
> + return arr; \
> +}
> +
> +#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
> +TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
> + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
> + TYPE *a = arr+1; \
> + a[100] = x; \
> + a[101] = x; \
> + a[102] = x; \
> + a[103] = x; \
> + return a; \
> +}
> +
> +STP_TEST_ALIGNED(int32_t);
> +STP_TEST_ALIGNED(int64_t);
> +STP_TEST_ALIGNED(v4si);
> +STP_TEST_UNALIGNED(int32_t);
> +STP_TEST_UNALIGNED(int64_t);
> +STP_TEST_UNALIGNED(v4si);
> +STP_TEST_ADJUST_ALIGNED(int32_t);
> +STP_TEST_ADJUST_ALIGNED(int64_t);
> +STP_TEST_ADJUST_UNALIGNED(int32_t);
> +STP_TEST_ADJUST_UNALIGNED(int64_t);
> +
> +/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 0 } } */
> +/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 0 } } */
> +/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 0 } } */
> +
> --
> 2.40.1
Thanks for the feedback, Kyrill.
I'll resend it as a V3. I believe you have also checked V2 containing just
a small test adjustment.
Manos Anagnostakis | Compiler Engineer
| E: manos.anagnostakis@vrull.eu
VRULL GmbH | Beatrixgasse 32 1030 Vienna | W: www.vrull.eu
Στις Δευ 25 Σεπ 2023, 13:59 ο χρήστης Kyrylo Tkachov <Kyrylo.Tkachov@arm.com>
έγραψε:
> Hi Manos,
>
> Apologies for the long delay.
>
> > -----Original Message-----
> > From: Manos Anagnostakis <manos.anagnostakis@vrull.eu>
> > Sent: Friday, August 18, 2023 8:50 AM
> > To: gcc-patches@gcc.gnu.org
> > Cc: Kyrylo Tkachov <Kyrylo.Tkachov@arm.com>; Philipp Tomsich
> > <philipp.tomsich@vrull.eu>; Manos Anagnostakis
> > <manos.anagnostakis@vrull.eu>
> > Subject: [PATCH] aarch64: Fine-grained ldp and stp policies with
> test-cases.
> >
> > This patch implements the following TODO in gcc/config/aarch64/aarch64.cc
> > to provide the requested behaviour for handling ldp and stp:
> >
> > /* Allow the tuning structure to disable LDP instruction formation
> > from combining instructions (e.g., in peephole2).
> > TODO: Implement fine-grained tuning control for LDP and STP:
> > 1. control policies for load and store separately;
> > 2. support the following policies:
> > - default (use what is in the tuning structure)
> > - always
> > - never
> > - aligned (only if the compiler can prove that the
> > load will be aligned to 2 * element_size) */
> >
> > It provides two new and concrete command-line options -mldp-policy and -
> > mstp-policy
> > to give the ability to control load and store policies seperately as
> > stated in part 1 of the TODO.
> >
> > The accepted values for both options are:
> > - default: Use the ldp/stp policy defined in the corresponding tuning
> > structure.
> > - always: Emit ldp/stp regardless of alignment.
> > - never: Do not emit ldp/stp.
> > - aligned: In order to emit ldp/stp, first check if the load/store will
> > be aligned to 2 * element_size.
> >
> > gcc/ChangeLog:
> > * config/aarch64/aarch64-protos.h (struct tune_params): Add
> > appropriate enums for the policies.
> > * config/aarch64/aarch64-tuning-flags.def
> > (AARCH64_EXTRA_TUNING_OPTION): Remove superseded tuning
> > options.
> > * config/aarch64/aarch64.cc (aarch64_parse_ldp_policy): New
> > function to parse ldp-policy option.
> > (aarch64_parse_stp_policy): New function to parse stp-policy
> option.
> > (aarch64_override_options_internal): Call parsing functions.
> > (aarch64_operands_ok_for_ldpstp): Add option-value check and
> > alignment check and remove superseded ones
> > (aarch64_operands_adjust_ok_for_ldpstp): Add option-value check
> and
> > alignment check and remove superseded ones.
> > * config/aarch64/aarch64.opt: Add options.
> >
> > gcc/testsuite/ChangeLog:
> > * gcc.target/aarch64/ldp_aligned.c: New test.
> > * gcc.target/aarch64/ldp_always.c: New test.
> > * gcc.target/aarch64/ldp_never.c: New test.
> > * gcc.target/aarch64/stp_aligned.c: New test.
> > * gcc.target/aarch64/stp_always.c: New test.
> > * gcc.target/aarch64/stp_never.c: New test.
> >
> > Signed-off-by: Manos Anagnostakis <manos.anagnostakis@vrull.eu>
> > ---
> >
> > gcc/config/aarch64/aarch64-protos.h | 24 ++
> > gcc/config/aarch64/aarch64-tuning-flags.def | 8 -
> > gcc/config/aarch64/aarch64.cc | 229 ++++++++++++++----
> > gcc/config/aarch64/aarch64.opt | 8 +
> > .../gcc.target/aarch64/ldp_aligned.c | 64 +++++
> > gcc/testsuite/gcc.target/aarch64/ldp_always.c | 64 +++++
> > gcc/testsuite/gcc.target/aarch64/ldp_never.c | 64 +++++
> > .../gcc.target/aarch64/stp_aligned.c | 60 +++++
> > gcc/testsuite/gcc.target/aarch64/stp_always.c | 60 +++++
> > gcc/testsuite/gcc.target/aarch64/stp_never.c | 60 +++++
> > 10 files changed, 580 insertions(+), 61 deletions(-)
> > create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
> > create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_always.c
> > create mode 100644 gcc/testsuite/gcc.target/aarch64/ldp_never.c
> > create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_aligned.c
> > create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_always.c
> > create mode 100644 gcc/testsuite/gcc.target/aarch64/stp_never.c
> >
> > diff --git a/gcc/config/aarch64/aarch64-protos.h
> > b/gcc/config/aarch64/aarch64-protos.h
> > index 70303d6fd95..be1d73490ed 100644
> > --- a/gcc/config/aarch64/aarch64-protos.h
> > +++ b/gcc/config/aarch64/aarch64-protos.h
> > @@ -568,6 +568,30 @@ struct tune_params
> > /* Place prefetch struct pointer at the end to enable type checking
> > errors when tune_params misses elements (e.g., from erroneous
> merges).
> > */
> > const struct cpu_prefetch_tune *prefetch;
> > +/* An enum specifying how to handle load pairs using a fine-grained
> policy:
> > + - LDP_POLICY_ALIGNED: Emit ldp if the source pointer is aligned
> > + to at least double the alignment of the type.
> > + - LDP_POLICY_ALWAYS: Emit ldp regardless of alignment.
> > + - LDP_POLICY_NEVER: Do not emit ldp. */
> > +
> > + enum aarch64_ldp_policy_model
> > + {
> > + LDP_POLICY_ALIGNED,
> > + LDP_POLICY_ALWAYS,
> > + LDP_POLICY_NEVER
> > + } ldp_policy_model;
> > +/* An enum specifying how to handle store pairs using a fine-grained
> policy:
> > + - STP_POLICY_ALIGNED: Emit stp if the source pointer is aligned
> > + to at least double the alignment of the type.
> > + - STP_POLICY_ALWAYS: Emit stp regardless of alignment.
> > + - STP_POLICY_NEVER: Do not emit stp. */
> > +
> > + enum aarch64_stp_policy_model
> > + {
> > + STP_POLICY_ALIGNED,
> > + STP_POLICY_ALWAYS,
> > + STP_POLICY_NEVER
> > + } stp_policy_model;
> > };
> >
> > /* Classifies an address.
> > diff --git a/gcc/config/aarch64/aarch64-tuning-flags.def
> > b/gcc/config/aarch64/aarch64-tuning-flags.def
> > index 52112ba7c48..774568e9106 100644
> > --- a/gcc/config/aarch64/aarch64-tuning-flags.def
> > +++ b/gcc/config/aarch64/aarch64-tuning-flags.def
> > @@ -30,11 +30,6 @@
> >
> > AARCH64_EXTRA_TUNING_OPTION ("rename_fma_regs",
> > RENAME_FMA_REGS)
> >
> > -/* Don't create non-8 byte aligned load/store pair. That is if the
> > -two load/stores are not at least 8 byte aligned don't create load/store
> > -pairs. */
> > -AARCH64_EXTRA_TUNING_OPTION ("slow_unaligned_ldpw",
> > SLOW_UNALIGNED_LDPW)
> > -
> > /* Some of the optional shift to some arthematic instructions are
> > considered cheap. Logical shift left <=4 with or without a
> > zero extend are considered cheap. Sign extend; non logical shift
> left
> > @@ -44,9 +39,6 @@ AARCH64_EXTRA_TUNING_OPTION
> > ("cheap_shift_extend", CHEAP_SHIFT_EXTEND)
> > /* Disallow load/store pair instructions on Q-registers. */
> > AARCH64_EXTRA_TUNING_OPTION ("no_ldp_stp_qregs",
> > NO_LDP_STP_QREGS)
> >
> > -/* Disallow load-pair instructions to be formed in combine/peephole. */
> > -AARCH64_EXTRA_TUNING_OPTION ("no_ldp_combine", NO_LDP_COMBINE)
> > -
> > AARCH64_EXTRA_TUNING_OPTION ("rename_load_regs",
> > RENAME_LOAD_REGS)
> >
> > AARCH64_EXTRA_TUNING_OPTION ("cse_sve_vl_constants",
> > CSE_SVE_VL_CONSTANTS)
> > diff --git a/gcc/config/aarch64/aarch64.cc
> b/gcc/config/aarch64/aarch64.cc
> > index 560e5431636..51c94804f12 100644
> > --- a/gcc/config/aarch64/aarch64.cc
> > +++ b/gcc/config/aarch64/aarch64.cc
> > @@ -1356,7 +1356,9 @@ static const struct tune_params generic_tunings =
> > Neoverse V1. It does not have a noticeable effect on A64FX and
> should
> > have at most a very minor effect on SVE2 cores. */
> > (AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params cortexa35_tunings =
> > @@ -1390,7 +1392,9 @@ static const struct tune_params cortexa35_tunings
> > =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params cortexa53_tunings =
> > @@ -1424,7 +1428,9 @@ static const struct tune_params cortexa53_tunings
> > =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params cortexa57_tunings =
> > @@ -1458,7 +1464,9 @@ static const struct tune_params cortexa57_tunings
> > =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_RENAME_FMA_REGS), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params cortexa72_tunings =
> > @@ -1492,7 +1500,9 @@ static const struct tune_params cortexa72_tunings
> > =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params cortexa73_tunings =
> > @@ -1526,7 +1536,9 @@ static const struct tune_params cortexa73_tunings
> > =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> >
> > @@ -1561,7 +1573,9 @@ static const struct tune_params exynosm1_tunings
> > =
> > 48, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &exynosm1_prefetch_tune
> > + &exynosm1_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params thunderxt88_tunings =
> > @@ -1593,8 +1607,10 @@ static const struct tune_params
> > thunderxt88_tunings =
> > 2, /* min_div_recip_mul_df. */
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
> > - (AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW), /* tune_flags. */
> > - &thunderxt88_prefetch_tune
> > + (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > + &thunderxt88_prefetch_tune,
> > + tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
> > };
> >
> > static const struct tune_params thunderx_tunings =
> > @@ -1626,9 +1642,10 @@ static const struct tune_params thunderx_tunings
> > =
> > 2, /* min_div_recip_mul_df. */
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
> > - (AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW
> > - | AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
> > - &thunderx_prefetch_tune
> > + (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
> > + &thunderx_prefetch_tune,
> > + tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
> > };
> >
> > static const struct tune_params tsv110_tunings =
> > @@ -1662,7 +1679,9 @@ static const struct tune_params tsv110_tunings =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &tsv110_prefetch_tune
> > + &tsv110_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params xgene1_tunings =
> > @@ -1695,7 +1714,9 @@ static const struct tune_params xgene1_tunings =
> > 17, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NO_LDP_STP_QREGS), /* tune_flags. */
> > - &xgene1_prefetch_tune
> > + &xgene1_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params emag_tunings =
> > @@ -1728,7 +1749,9 @@ static const struct tune_params emag_tunings =
> > 17, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NO_LDP_STP_QREGS), /* tune_flags. */
> > - &xgene1_prefetch_tune
> > + &xgene1_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params qdf24xx_tunings =
> > @@ -1762,7 +1785,9 @@ static const struct tune_params qdf24xx_tunings =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > AARCH64_EXTRA_TUNE_RENAME_LOAD_REGS, /* tune_flags. */
> > - &qdf24xx_prefetch_tune
> > + &qdf24xx_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > /* Tuning structure for the Qualcomm Saphira core. Default to falkor
> values
> > @@ -1798,7 +1823,9 @@ static const struct tune_params saphira_tunings =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params thunderx2t99_tunings =
> > @@ -1832,7 +1859,9 @@ static const struct tune_params
> > thunderx2t99_tunings =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &thunderx2t99_prefetch_tune
> > + &thunderx2t99_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params thunderx3t110_tunings =
> > @@ -1866,7 +1895,9 @@ static const struct tune_params
> > thunderx3t110_tunings =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &thunderx3t110_prefetch_tune
> > + &thunderx3t110_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params neoversen1_tunings =
> > @@ -1899,7 +1930,9 @@ static const struct tune_params
> > neoversen1_tunings =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params ampere1_tunings =
> > @@ -1935,8 +1968,10 @@ static const struct tune_params ampere1_tunings
> > =
> > 2, /* min_div_recip_mul_df. */
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > - (AARCH64_EXTRA_TUNE_NO_LDP_COMBINE), /* tune_flags. */
> > - &ere1_prefetch_tune
> > + (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > + &ere1_prefetch_tune,
> > + tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
> > };
> >
> > static const struct tune_params ampere1a_tunings =
> > @@ -1973,8 +2008,10 @@ static const struct tune_params ampere1a_tunings
> > =
> > 2, /* min_div_recip_mul_df. */
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > - (AARCH64_EXTRA_TUNE_NO_LDP_COMBINE), /* tune_flags. */
> > - &ere1_prefetch_tune
> > + (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > + &ere1_prefetch_tune,
> > + tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
> > };
> >
> > static const advsimd_vec_cost neoversev1_advsimd_vector_cost =
> > @@ -2155,7 +2192,9 @@ static const struct tune_params
> > neoversev1_tunings =
> > | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
> > | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
> > | AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const sve_vec_cost neoverse512tvb_sve_vector_cost =
> > @@ -2292,7 +2331,9 @@ static const struct tune_params
> > neoverse512tvb_tunings =
> > (AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
> > | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
> > | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /*
> > tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const advsimd_vec_cost neoversen2_advsimd_vector_cost =
> > @@ -2482,7 +2523,9 @@ static const struct tune_params
> > neoversen2_tunings =
> > | AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
> > | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
> > | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /*
> > tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const advsimd_vec_cost neoversev2_advsimd_vector_cost =
> > @@ -2672,7 +2715,9 @@ static const struct tune_params
> > neoversev2_tunings =
> > | AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
> > | AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
> > | AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /*
> > tune_flags. */
> > - &generic_prefetch_tune
> > + &generic_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > static const struct tune_params a64fx_tunings =
> > @@ -2705,7 +2750,9 @@ static const struct tune_params a64fx_tunings =
> > 0, /* max_case_values. */
> > tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
> > (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
> > - &a64fx_prefetch_tune
> > + &a64fx_prefetch_tune,
> > + tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
> > + tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
> > };
> >
> > /* Support for fine-grained override of the tuning structures. */
> > @@ -17645,6 +17692,50 @@ aarch64_parse_tune (const char *to_parse,
> > const struct processor **res)
> > return AARCH_PARSE_INVALID_ARG;
> > }
> >
> > +/* Validate a command-line -mldp-policy option. Parse the policy
> > + specified in STR and throw errors if appropriate. */
> > +
> > +static bool
> > +aarch64_parse_ldp_policy (const char *str, struct tune_params* tune)
> > +{
> > + /* Check the value of the option to be one of the accepted. */
> > + if (strcmp (str, "always") == 0)
> > + tune->ldp_policy_model = tune_params::LDP_POLICY_ALWAYS;
> > + else if (strcmp (str, "never") == 0)
> > + tune->ldp_policy_model = tune_params::LDP_POLICY_NEVER;
> > + else if (strcmp (str, "aligned") == 0)
> > + tune->ldp_policy_model = tune_params::LDP_POLICY_ALIGNED;
> > + else if (strcmp (str, "default") != 0)
> > + {
> > + error ("unknown value %qs for %<-mldp-policy%>", str);
> > + return false;
> > + }
> > +
> > + return true;
> > +}
> > +
> > +/* Validate a command-line -mstp-policy option. Parse the policy
> > + specified in STR and throw errors if appropriate. */
> > +
> > +static bool
> > +aarch64_parse_stp_policy (const char *str, struct tune_params* tune)
> > +{
> > + /* Check the value of the option to be one of the accepted. */
> > + if (strcmp (str, "always") == 0)
> > + tune->stp_policy_model = tune_params::STP_POLICY_ALWAYS;
> > + else if (strcmp (str, "never") == 0)
> > + tune->stp_policy_model = tune_params::STP_POLICY_NEVER;
> > + else if (strcmp (str, "aligned") == 0)
> > + tune->stp_policy_model = tune_params::STP_POLICY_ALIGNED;
> > + else if (strcmp (str, "default") != 0)
> > + {
> > + error ("unknown value %qs for %<-mstp-policy%>", str);
> > + return false;
> > + }
> > +
> > + return true;
> > +}
> > +
> > /* Parse TOKEN, which has length LENGTH to see if it is an option
> > described in FLAG. If it is, return the index bit for that fusion
> type.
> > If not, error (printing OPTION_NAME) and return zero. */
> > @@ -17993,6 +18084,14 @@ aarch64_override_options_internal (struct
> > gcc_options *opts)
> > aarch64_parse_override_string (opts->x_aarch64_override_tune_string,
> > &aarch64_tune_params);
> >
> > + if (opts->x_aarch64_ldp_policy_string)
> > + aarch64_parse_ldp_policy (opts->x_aarch64_ldp_policy_string,
> > + &aarch64_tune_params);
> > +
> > + if (opts->x_aarch64_stp_policy_string)
> > + aarch64_parse_stp_policy (opts->x_aarch64_stp_policy_string,
> > + &aarch64_tune_params);
> > +
> > /* This target defaults to strict volatile bitfields. */
> > if (opts->x_flag_strict_volatile_bitfields < 0 &&
> abi_version_at_least (2))
> > opts->x_flag_strict_volatile_bitfields = 1;
> > @@ -26301,18 +26400,14 @@ aarch64_operands_ok_for_ldpstp (rtx
> > *operands, bool load,
> > enum reg_class rclass_1, rclass_2;
> > rtx mem_1, mem_2, reg_1, reg_2;
> >
> > - /* Allow the tuning structure to disable LDP instruction formation
> > - from combining instructions (e.g., in peephole2).
> > - TODO: Implement fine-grained tuning control for LDP and STP:
> > - 1. control policies for load and store separately;
> > - 2. support the following policies:
> > - - default (use what is in the tuning structure)
> > - - always
> > - - never
> > - - aligned (only if the compiler can prove that the
> > - load will be aligned to 2 * element_size) */
> > - if (load && (aarch64_tune_params.extra_tuning_flags
> > - & AARCH64_EXTRA_TUNE_NO_LDP_COMBINE))
> > + /* If we have LDP_POLICY_NEVER, reject the load pair. */
> > + if (load
> > + && aarch64_tune_params.ldp_policy_model ==
> > tune_params::LDP_POLICY_NEVER)
> > + return false;
> > +
> > + /* If we have STP_POLICY_NEVER, reject the store pair. */
> > + if (!load
> > + && aarch64_tune_params.stp_policy_model ==
> > tune_params::STP_POLICY_NEVER)
> > return false;
> >
> > if (load)
> > @@ -26339,13 +26434,22 @@ aarch64_operands_ok_for_ldpstp (rtx
> > *operands, bool load,
> > if (MEM_VOLATILE_P (mem_1) || MEM_VOLATILE_P (mem_2))
> > return false;
> >
> > - /* If we have SImode and slow unaligned ldp,
> > - check the alignment to be at least 8 byte. */
> > - if (mode == SImode
> > - && (aarch64_tune_params.extra_tuning_flags
> > - & AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW)
> > + /* If we have LDP_POLICY_ALIGNED,
> > + do not emit the load pair unless the alignment is checked to be
> > + at least double the alignment of the type. */
> > + if (load
> > + && aarch64_tune_params.ldp_policy_model ==
> > tune_params::LDP_POLICY_ALIGNED
> > && !optimize_size
> > - && MEM_ALIGN (mem_1) < 8 * BITS_PER_UNIT)
> > + && MEM_ALIGN (mem_1) < 2 * GET_MODE_ALIGNMENT (mode))
> > + return false;
> > +
> > + /* If we have STP_POLICY_ALIGNED,
> > + do not emit the store pair unless the alignment is checked to be
> > + at least double the alignment of the type. */
> > + if (!load
> > + && aarch64_tune_params.stp_policy_model ==
> > tune_params::STP_POLICY_ALIGNED
> > + && !optimize_size
> > + && MEM_ALIGN (mem_1) < 2 * GET_MODE_ALIGNMENT (mode))
> > return false;
>
> I appreciate there is an existing use of optimize_size above, but the
> recommended way of checking this is optimize_function_for_size_p (cfun)
> >
> > /* Check if the addresses are in the form of [base+offset]. */
> > @@ -26475,6 +26579,16 @@ aarch64_operands_adjust_ok_for_ldpstp (rtx
> > *operands, bool load,
> > HOST_WIDE_INT offvals[num_insns], msize;
> > rtx mem[num_insns], reg[num_insns], base[num_insns],
> > offset[num_insns];
> >
> > + /* If we have LDP_POLICY_NEVER, reject the load pair. */
> > + if (load
> > + && aarch64_tune_params.ldp_policy_model ==
> > tune_params::LDP_POLICY_NEVER)
> > + return false;
> > +
> > + /* If we have STP_POLICY_NEVER, reject the store pair. */
> > + if (!load
> > + && aarch64_tune_params.stp_policy_model ==
> > tune_params::STP_POLICY_NEVER)
> > + return false;
> > +
> > if (load)
> > {
> > for (int i = 0; i < num_insns; i++)
> > @@ -26564,13 +26678,22 @@ aarch64_operands_adjust_ok_for_ldpstp (rtx
> > *operands, bool load,
> > if (offvals[0] % msize != offvals[2] % msize)
> > return false;
> >
> > - /* If we have SImode and slow unaligned ldp,
> > - check the alignment to be at least 8 byte. */
> > - if (mode == SImode
> > - && (aarch64_tune_params.extra_tuning_flags
> > - & AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW)
> > + /* If we have LDP_POLICY_ALIGNED,
> > + do not emit the load pair unless the alignment is checked to be
> > + at least double the alignment of the type. */
> > + if (load
> > + && aarch64_tune_params.ldp_policy_model ==
> > tune_params::LDP_POLICY_ALIGNED
> > + && !optimize_size
> > + && MEM_ALIGN (mem[0]) < 2 * GET_MODE_ALIGNMENT (mode))
> > + return false;
> > +
> > + /* If we have STP_POLICY_ALIGNED,
> > + do not emit the store pair unless the alignment is checked to be
> > + at least double the alignment of the type. */
> > + if (!load
> > + && aarch64_tune_params.stp_policy_model ==
> > tune_params::STP_POLICY_ALIGNED
> > && !optimize_size
> > - && MEM_ALIGN (mem[0]) < 8 * BITS_PER_UNIT)
> > + && MEM_ALIGN (mem[0]) < 2 * GET_MODE_ALIGNMENT (mode))
> > return false;
> >
> > return true;
> > diff --git a/gcc/config/aarch64/aarch64.opt
> b/gcc/config/aarch64/aarch64.opt
> > index 4a0580435a8..e5302947ce7 100644
> > --- a/gcc/config/aarch64/aarch64.opt
> > +++ b/gcc/config/aarch64/aarch64.opt
> > @@ -205,6 +205,14 @@ msign-return-address=
> > Target WarnRemoved RejectNegative Joined Enum(aarch_ra_sign_scope_t)
> > Var(aarch_ra_sign_scope) Init(AARCH_FUNCTION_NONE) Save
> > Select return address signing scope.
> >
> > +mldp-policy=
> > +Target RejectNegative Joined Var(aarch64_ldp_policy_string) Save
> > +Fine-grained policy for load pairs.
> > +
> > +mstp-policy=
> > +Target RejectNegative Joined Var(aarch64_stp_policy_string) Save
> > +Fine-grained policy for store pairs.
>
> I'd like to avoid having -m* option for such low-level codegen tweaks. -m*
> options should be used for options that enable/disable user-visible
> features, ABI things etc.
> We have target-specific params these days so I'd recommend you implement
> this in a similar way to -param=aarch64-autovec-preference=.
> It will have to take a number rather than a string but that should be
> okay, as long as the right values are documented in invoke.texi.
> Otherwise the approach looks good.
> Thanks,
> Kyrill
>
> > +
> > Enum
> > Name(aarch_ra_sign_scope_t) Type(enum aarch_function_type)
> > Supported AArch64 return address signing scope (for use with
> -msign-return-
> > address= option):
> > diff --git a/gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
> > b/gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
> > new file mode 100644
> > index 00000000000..895018f6b53
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/aarch64/ldp_aligned.c
> > @@ -0,0 +1,64 @@
> > +/* { dg-options "-O3 -mldp-policy=aligned" } */
> > +
> > +#include <stdlib.h>
> > +#include <stdint.h>
> > +
> > +typedef int v4si __attribute__ ((vector_size (16)));
> > +
> > +#define LDP_TEST_ALIGNED(TYPE) \
> > +TYPE ldp_aligned_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + a_0 = arr[0]; \
> > + a_1 = arr[1]; \
> > + return a_0 + a_1; \
> > +}
> > +
> > +#define LDP_TEST_UNALIGNED(TYPE) \
> > +TYPE ldp_unaligned_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a_0 = a[0]; \
> > + a_1 = a[1]; \
> > + return a_0 + a_1; \
> > +}
> > +
> > +#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
> > +TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1, a_2, a_3; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + a_0 = arr[100]; \
> > + a_1 = arr[101]; \
> > + a_2 = arr[102]; \
> > + a_3 = arr[103]; \
> > + return a_0 + a_1 + a_2 + a_3; \
> > +}
> > +
> > +#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
> > +TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1, a_2, a_3; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a_0 = a[100]; \
> > + a_1 = a[101]; \
> > + a_2 = a[102]; \
> > + a_3 = a[103]; \
> > + return a_0 + a_1 + a_2 + a_3; \
> > +}
> > +
> > +LDP_TEST_ALIGNED(int32_t);
> > +LDP_TEST_ALIGNED(int64_t);
> > +LDP_TEST_ALIGNED(v4si);
> > +LDP_TEST_UNALIGNED(int32_t);
> > +LDP_TEST_UNALIGNED(int64_t);
> > +LDP_TEST_UNALIGNED(v4si);
> > +LDP_TEST_ADJUST_ALIGNED(int32_t);
> > +LDP_TEST_ADJUST_ALIGNED(int64_t);
> > +LDP_TEST_ADJUST_UNALIGNED(int32_t);
> > +LDP_TEST_ADJUST_UNALIGNED(int64_t);
> > +
> > +/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 3 } } */
> > +/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 3 } } */
> > +/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 1 } } */
> > +
> > diff --git a/gcc/testsuite/gcc.target/aarch64/ldp_always.c
> > b/gcc/testsuite/gcc.target/aarch64/ldp_always.c
> > new file mode 100644
> > index 00000000000..ead4fe41891
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/aarch64/ldp_always.c
> > @@ -0,0 +1,64 @@
> > +/* { dg-options "-O3 -mldp-policy=always" } */
> > +
> > +#include <stdlib.h>
> > +#include <stdint.h>
> > +
> > +typedef int v4si __attribute__ ((vector_size (16)));
> > +
> > +#define LDP_TEST_ALIGNED(TYPE) \
> > +TYPE ldp_aligned_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + a_0 = arr[0]; \
> > + a_1 = arr[1]; \
> > + return a_0 + a_1; \
> > +}
> > +
> > +#define LDP_TEST_UNALIGNED(TYPE) \
> > +TYPE ldp_unaligned_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a_0 = a[0]; \
> > + a_1 = a[1]; \
> > + return a_0 + a_1; \
> > +}
> > +
> > +#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
> > +TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1, a_2, a_3; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + a_0 = arr[100]; \
> > + a_1 = arr[101]; \
> > + a_2 = arr[102]; \
> > + a_3 = arr[103]; \
> > + return a_0 + a_1 + a_2 + a_3; \
> > +}
> > +
> > +#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
> > +TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1, a_2, a_3; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a_0 = a[100]; \
> > + a_1 = a[101]; \
> > + a_2 = a[102]; \
> > + a_3 = a[103]; \
> > + return a_0 + a_1 + a_2 + a_3; \
> > +}
> > +
> > +LDP_TEST_ALIGNED(int32_t);
> > +LDP_TEST_ALIGNED(int64_t);
> > +LDP_TEST_ALIGNED(v4si);
> > +LDP_TEST_UNALIGNED(int32_t);
> > +LDP_TEST_UNALIGNED(int64_t);
> > +LDP_TEST_UNALIGNED(v4si);
> > +LDP_TEST_ADJUST_ALIGNED(int32_t);
> > +LDP_TEST_ADJUST_ALIGNED(int64_t);
> > +LDP_TEST_ADJUST_UNALIGNED(int32_t);
> > +LDP_TEST_ADJUST_UNALIGNED(int64_t);
> > +
> > +/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 6 } } */
> > +/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 6 } } */
> > +/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 2 } } */
> > +
> > diff --git a/gcc/testsuite/gcc.target/aarch64/ldp_never.c
> > b/gcc/testsuite/gcc.target/aarch64/ldp_never.c
> > new file mode 100644
> > index 00000000000..aae2f087241
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/aarch64/ldp_never.c
> > @@ -0,0 +1,64 @@
> > +/* { dg-options "-O3 -mldp-policy=never" } */
> > +
> > +#include <stdlib.h>
> > +#include <stdint.h>
> > +
> > +typedef int v4si __attribute__ ((vector_size (16)));
> > +
> > +#define LDP_TEST_ALIGNED(TYPE) \
> > +TYPE ldp_aligned_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + a_0 = arr[0]; \
> > + a_1 = arr[1]; \
> > + return a_0 + a_1; \
> > +}
> > +
> > +#define LDP_TEST_UNALIGNED(TYPE) \
> > +TYPE ldp_unaligned_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a_0 = a[0]; \
> > + a_1 = a[1]; \
> > + return a_0 + a_1; \
> > +}
> > +
> > +#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
> > +TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1, a_2, a_3; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + a_0 = arr[100]; \
> > + a_1 = arr[101]; \
> > + a_2 = arr[102]; \
> > + a_3 = arr[103]; \
> > + return a_0 + a_1 + a_2 + a_3; \
> > +}
> > +
> > +#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
> > +TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
> > + TYPE a_0, a_1, a_2, a_3; \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a_0 = a[100]; \
> > + a_1 = a[101]; \
> > + a_2 = a[102]; \
> > + a_3 = a[103]; \
> > + return a_0 + a_1 + a_2 + a_3; \
> > +}
> > +
> > +LDP_TEST_ALIGNED(int32_t);
> > +LDP_TEST_ALIGNED(int64_t);
> > +LDP_TEST_ALIGNED(v4si);
> > +LDP_TEST_UNALIGNED(int32_t);
> > +LDP_TEST_UNALIGNED(int64_t);
> > +LDP_TEST_UNALIGNED(v4si);
> > +LDP_TEST_ADJUST_ALIGNED(int32_t);
> > +LDP_TEST_ADJUST_ALIGNED(int64_t);
> > +LDP_TEST_ADJUST_UNALIGNED(int32_t);
> > +LDP_TEST_ADJUST_UNALIGNED(int64_t);
> > +
> > +/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 0 } } */
> > +/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 0 } } */
> > +/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 0 } } */
> > +
> > diff --git a/gcc/testsuite/gcc.target/aarch64/stp_aligned.c
> > b/gcc/testsuite/gcc.target/aarch64/stp_aligned.c
> > new file mode 100644
> > index 00000000000..07b49629292
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/aarch64/stp_aligned.c
> > @@ -0,0 +1,60 @@
> > +/* { dg-options "-O3 -mstp-policy=aligned" } */
> > +
> > +#include <stdlib.h>
> > +#include <stdint.h>
> > +
> > +typedef int v4si __attribute__ ((vector_size (16)));
> > +
> > +#define STP_TEST_ALIGNED(TYPE) \
> > +TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + arr[0] = x; \
> > + arr[1] = x; \
> > + return arr; \
> > +}
> > +
> > +#define STP_TEST_UNALIGNED(TYPE) \
> > +TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a[0] = x; \
> > + a[1] = x; \
> > + return a; \
> > +}
> > +
> > +#define STP_TEST_ADJUST_ALIGNED(TYPE) \
> > +TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + arr[100] = x; \
> > + arr[101] = x; \
> > + arr[102] = x; \
> > + arr[103] = x; \
> > + return arr; \
> > +}
> > +
> > +#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
> > +TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a[100] = x; \
> > + a[101] = x; \
> > + a[102] = x; \
> > + a[103] = x; \
> > + return a; \
> > +}
> > +
> > +STP_TEST_ALIGNED(int32_t);
> > +STP_TEST_ALIGNED(int64_t);
> > +STP_TEST_ALIGNED(v4si);
> > +STP_TEST_UNALIGNED(int32_t);
> > +STP_TEST_UNALIGNED(int64_t);
> > +STP_TEST_UNALIGNED(v4si);
> > +STP_TEST_ADJUST_ALIGNED(int32_t);
> > +STP_TEST_ADJUST_ALIGNED(int64_t);
> > +STP_TEST_ADJUST_UNALIGNED(int32_t);
> > +STP_TEST_ADJUST_UNALIGNED(int64_t);
> > +
> > +/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 3 } } */
> > +/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 3 } } */
> > +/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 1 } } */
> > +
> > diff --git a/gcc/testsuite/gcc.target/aarch64/stp_always.c
> > b/gcc/testsuite/gcc.target/aarch64/stp_always.c
> > new file mode 100644
> > index 00000000000..6a1c671f02c
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/aarch64/stp_always.c
> > @@ -0,0 +1,60 @@
> > +/* { dg-options "-O3 -mstp-policy=always" } */
> > +
> > +#include <stdlib.h>
> > +#include <stdint.h>
> > +
> > +typedef int v4si __attribute__ ((vector_size (16)));
> > +
> > +#define STP_TEST_ALIGNED(TYPE) \
> > +TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + arr[0] = x; \
> > + arr[1] = x; \
> > + return arr; \
> > +}
> > +
> > +#define STP_TEST_UNALIGNED(TYPE) \
> > +TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a[0] = x; \
> > + a[1] = x; \
> > + return a; \
> > +}
> > +
> > +#define STP_TEST_ADJUST_ALIGNED(TYPE) \
> > +TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + arr[100] = x; \
> > + arr[101] = x; \
> > + arr[102] = x; \
> > + arr[103] = x; \
> > + return arr; \
> > +}
> > +
> > +#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
> > +TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a[100] = x; \
> > + a[101] = x; \
> > + a[102] = x; \
> > + a[103] = x; \
> > + return a; \
> > +}
> > +
> > +STP_TEST_ALIGNED(int32_t);
> > +STP_TEST_ALIGNED(int64_t);
> > +STP_TEST_ALIGNED(v4si);
> > +STP_TEST_UNALIGNED(int32_t);
> > +STP_TEST_UNALIGNED(int64_t);
> > +STP_TEST_UNALIGNED(v4si);
> > +STP_TEST_ADJUST_ALIGNED(int32_t);
> > +STP_TEST_ADJUST_ALIGNED(int64_t);
> > +STP_TEST_ADJUST_UNALIGNED(int32_t);
> > +STP_TEST_ADJUST_UNALIGNED(int64_t);
> > +
> > +/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 6 } } */
> > +/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 6 } } */
> > +/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 2 } } */
> > +
> > diff --git a/gcc/testsuite/gcc.target/aarch64/stp_never.c
> > b/gcc/testsuite/gcc.target/aarch64/stp_never.c
> > new file mode 100644
> > index 00000000000..9cd703995b7
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/aarch64/stp_never.c
> > @@ -0,0 +1,60 @@
> > +/* { dg-options "-O3 -mstp-policy=never" } */
> > +
> > +#include <stdlib.h>
> > +#include <stdint.h>
> > +
> > +typedef int v4si __attribute__ ((vector_size (16)));
> > +
> > +#define STP_TEST_ALIGNED(TYPE) \
> > +TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + arr[0] = x; \
> > + arr[1] = x; \
> > + return arr; \
> > +}
> > +
> > +#define STP_TEST_UNALIGNED(TYPE) \
> > +TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a[0] = x; \
> > + a[1] = x; \
> > + return a; \
> > +}
> > +
> > +#define STP_TEST_ADJUST_ALIGNED(TYPE) \
> > +TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + arr[100] = x; \
> > + arr[101] = x; \
> > + arr[102] = x; \
> > + arr[103] = x; \
> > + return arr; \
> > +}
> > +
> > +#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
> > +TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
> > + TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) -
> 1)); \
> > + TYPE *a = arr+1; \
> > + a[100] = x; \
> > + a[101] = x; \
> > + a[102] = x; \
> > + a[103] = x; \
> > + return a; \
> > +}
> > +
> > +STP_TEST_ALIGNED(int32_t);
> > +STP_TEST_ALIGNED(int64_t);
> > +STP_TEST_ALIGNED(v4si);
> > +STP_TEST_UNALIGNED(int32_t);
> > +STP_TEST_UNALIGNED(int64_t);
> > +STP_TEST_UNALIGNED(v4si);
> > +STP_TEST_ADJUST_ALIGNED(int32_t);
> > +STP_TEST_ADJUST_ALIGNED(int64_t);
> > +STP_TEST_ADJUST_UNALIGNED(int32_t);
> > +STP_TEST_ADJUST_UNALIGNED(int64_t);
> > +
> > +/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 0 } } */
> > +/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 0 } } */
> > +/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 0 } } */
> > +
> > --
> > 2.40.1
>
>
@@ -568,6 +568,30 @@ struct tune_params
/* Place prefetch struct pointer at the end to enable type checking
errors when tune_params misses elements (e.g., from erroneous merges). */
const struct cpu_prefetch_tune *prefetch;
+/* An enum specifying how to handle load pairs using a fine-grained policy:
+ - LDP_POLICY_ALIGNED: Emit ldp if the source pointer is aligned
+ to at least double the alignment of the type.
+ - LDP_POLICY_ALWAYS: Emit ldp regardless of alignment.
+ - LDP_POLICY_NEVER: Do not emit ldp. */
+
+ enum aarch64_ldp_policy_model
+ {
+ LDP_POLICY_ALIGNED,
+ LDP_POLICY_ALWAYS,
+ LDP_POLICY_NEVER
+ } ldp_policy_model;
+/* An enum specifying how to handle store pairs using a fine-grained policy:
+ - STP_POLICY_ALIGNED: Emit stp if the source pointer is aligned
+ to at least double the alignment of the type.
+ - STP_POLICY_ALWAYS: Emit stp regardless of alignment.
+ - STP_POLICY_NEVER: Do not emit stp. */
+
+ enum aarch64_stp_policy_model
+ {
+ STP_POLICY_ALIGNED,
+ STP_POLICY_ALWAYS,
+ STP_POLICY_NEVER
+ } stp_policy_model;
};
/* Classifies an address.
@@ -30,11 +30,6 @@
AARCH64_EXTRA_TUNING_OPTION ("rename_fma_regs", RENAME_FMA_REGS)
-/* Don't create non-8 byte aligned load/store pair. That is if the
-two load/stores are not at least 8 byte aligned don't create load/store
-pairs. */
-AARCH64_EXTRA_TUNING_OPTION ("slow_unaligned_ldpw", SLOW_UNALIGNED_LDPW)
-
/* Some of the optional shift to some arthematic instructions are
considered cheap. Logical shift left <=4 with or without a
zero extend are considered cheap. Sign extend; non logical shift left
@@ -44,9 +39,6 @@ AARCH64_EXTRA_TUNING_OPTION ("cheap_shift_extend", CHEAP_SHIFT_EXTEND)
/* Disallow load/store pair instructions on Q-registers. */
AARCH64_EXTRA_TUNING_OPTION ("no_ldp_stp_qregs", NO_LDP_STP_QREGS)
-/* Disallow load-pair instructions to be formed in combine/peephole. */
-AARCH64_EXTRA_TUNING_OPTION ("no_ldp_combine", NO_LDP_COMBINE)
-
AARCH64_EXTRA_TUNING_OPTION ("rename_load_regs", RENAME_LOAD_REGS)
AARCH64_EXTRA_TUNING_OPTION ("cse_sve_vl_constants", CSE_SVE_VL_CONSTANTS)
@@ -1356,7 +1356,9 @@ static const struct tune_params generic_tunings =
Neoverse V1. It does not have a noticeable effect on A64FX and should
have at most a very minor effect on SVE2 cores. */
(AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params cortexa35_tunings =
@@ -1390,7 +1392,9 @@ static const struct tune_params cortexa35_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params cortexa53_tunings =
@@ -1424,7 +1428,9 @@ static const struct tune_params cortexa53_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params cortexa57_tunings =
@@ -1458,7 +1464,9 @@ static const struct tune_params cortexa57_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_RENAME_FMA_REGS), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params cortexa72_tunings =
@@ -1492,7 +1500,9 @@ static const struct tune_params cortexa72_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params cortexa73_tunings =
@@ -1526,7 +1536,9 @@ static const struct tune_params cortexa73_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
@@ -1561,7 +1573,9 @@ static const struct tune_params exynosm1_tunings =
48, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &exynosm1_prefetch_tune
+ &exynosm1_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params thunderxt88_tunings =
@@ -1593,8 +1607,10 @@ static const struct tune_params thunderxt88_tunings =
2, /* min_div_recip_mul_df. */
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
- (AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW), /* tune_flags. */
- &thunderxt88_prefetch_tune
+ (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
+ &thunderxt88_prefetch_tune,
+ tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
};
static const struct tune_params thunderx_tunings =
@@ -1626,9 +1642,10 @@ static const struct tune_params thunderx_tunings =
2, /* min_div_recip_mul_df. */
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
- (AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW
- | AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
- &thunderx_prefetch_tune
+ (AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
+ &thunderx_prefetch_tune,
+ tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
};
static const struct tune_params tsv110_tunings =
@@ -1662,7 +1679,9 @@ static const struct tune_params tsv110_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &tsv110_prefetch_tune
+ &tsv110_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params xgene1_tunings =
@@ -1695,7 +1714,9 @@ static const struct tune_params xgene1_tunings =
17, /* max_case_values. */
tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NO_LDP_STP_QREGS), /* tune_flags. */
- &xgene1_prefetch_tune
+ &xgene1_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params emag_tunings =
@@ -1728,7 +1749,9 @@ static const struct tune_params emag_tunings =
17, /* max_case_values. */
tune_params::AUTOPREFETCHER_OFF, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NO_LDP_STP_QREGS), /* tune_flags. */
- &xgene1_prefetch_tune
+ &xgene1_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params qdf24xx_tunings =
@@ -1762,7 +1785,9 @@ static const struct tune_params qdf24xx_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
AARCH64_EXTRA_TUNE_RENAME_LOAD_REGS, /* tune_flags. */
- &qdf24xx_prefetch_tune
+ &qdf24xx_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
/* Tuning structure for the Qualcomm Saphira core. Default to falkor values
@@ -1798,7 +1823,9 @@ static const struct tune_params saphira_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params thunderx2t99_tunings =
@@ -1832,7 +1859,9 @@ static const struct tune_params thunderx2t99_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &thunderx2t99_prefetch_tune
+ &thunderx2t99_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params thunderx3t110_tunings =
@@ -1866,7 +1895,9 @@ static const struct tune_params thunderx3t110_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &thunderx3t110_prefetch_tune
+ &thunderx3t110_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params neoversen1_tunings =
@@ -1899,7 +1930,9 @@ static const struct tune_params neoversen1_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params ampere1_tunings =
@@ -1935,8 +1968,10 @@ static const struct tune_params ampere1_tunings =
2, /* min_div_recip_mul_df. */
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
- (AARCH64_EXTRA_TUNE_NO_LDP_COMBINE), /* tune_flags. */
- &ere1_prefetch_tune
+ (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
+ &ere1_prefetch_tune,
+ tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
};
static const struct tune_params ampere1a_tunings =
@@ -1973,8 +2008,10 @@ static const struct tune_params ampere1a_tunings =
2, /* min_div_recip_mul_df. */
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
- (AARCH64_EXTRA_TUNE_NO_LDP_COMBINE), /* tune_flags. */
- &ere1_prefetch_tune
+ (AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
+ &ere1_prefetch_tune,
+ tune_params::LDP_POLICY_ALIGNED, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALIGNED /* stp_policy_model. */
};
static const advsimd_vec_cost neoversev1_advsimd_vector_cost =
@@ -2155,7 +2192,9 @@ static const struct tune_params neoversev1_tunings =
| AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
| AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT
| AARCH64_EXTRA_TUNE_CHEAP_SHIFT_EXTEND), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const sve_vec_cost neoverse512tvb_sve_vector_cost =
@@ -2292,7 +2331,9 @@ static const struct tune_params neoverse512tvb_tunings =
(AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
| AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
| AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const advsimd_vec_cost neoversen2_advsimd_vector_cost =
@@ -2482,7 +2523,9 @@ static const struct tune_params neoversen2_tunings =
| AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
| AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
| AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const advsimd_vec_cost neoversev2_advsimd_vector_cost =
@@ -2672,7 +2715,9 @@ static const struct tune_params neoversev2_tunings =
| AARCH64_EXTRA_TUNE_CSE_SVE_VL_CONSTANTS
| AARCH64_EXTRA_TUNE_USE_NEW_VECTOR_COSTS
| AARCH64_EXTRA_TUNE_MATCHED_VECTOR_THROUGHPUT), /* tune_flags. */
- &generic_prefetch_tune
+ &generic_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
static const struct tune_params a64fx_tunings =
@@ -2705,7 +2750,9 @@ static const struct tune_params a64fx_tunings =
0, /* max_case_values. */
tune_params::AUTOPREFETCHER_WEAK, /* autoprefetcher_model. */
(AARCH64_EXTRA_TUNE_NONE), /* tune_flags. */
- &a64fx_prefetch_tune
+ &a64fx_prefetch_tune,
+ tune_params::LDP_POLICY_ALWAYS, /* ldp_policy_model. */
+ tune_params::STP_POLICY_ALWAYS /* stp_policy_model. */
};
/* Support for fine-grained override of the tuning structures. */
@@ -17645,6 +17692,50 @@ aarch64_parse_tune (const char *to_parse, const struct processor **res)
return AARCH_PARSE_INVALID_ARG;
}
+/* Validate a command-line -mldp-policy option. Parse the policy
+ specified in STR and throw errors if appropriate. */
+
+static bool
+aarch64_parse_ldp_policy (const char *str, struct tune_params* tune)
+{
+ /* Check the value of the option to be one of the accepted. */
+ if (strcmp (str, "always") == 0)
+ tune->ldp_policy_model = tune_params::LDP_POLICY_ALWAYS;
+ else if (strcmp (str, "never") == 0)
+ tune->ldp_policy_model = tune_params::LDP_POLICY_NEVER;
+ else if (strcmp (str, "aligned") == 0)
+ tune->ldp_policy_model = tune_params::LDP_POLICY_ALIGNED;
+ else if (strcmp (str, "default") != 0)
+ {
+ error ("unknown value %qs for %<-mldp-policy%>", str);
+ return false;
+ }
+
+ return true;
+}
+
+/* Validate a command-line -mstp-policy option. Parse the policy
+ specified in STR and throw errors if appropriate. */
+
+static bool
+aarch64_parse_stp_policy (const char *str, struct tune_params* tune)
+{
+ /* Check the value of the option to be one of the accepted. */
+ if (strcmp (str, "always") == 0)
+ tune->stp_policy_model = tune_params::STP_POLICY_ALWAYS;
+ else if (strcmp (str, "never") == 0)
+ tune->stp_policy_model = tune_params::STP_POLICY_NEVER;
+ else if (strcmp (str, "aligned") == 0)
+ tune->stp_policy_model = tune_params::STP_POLICY_ALIGNED;
+ else if (strcmp (str, "default") != 0)
+ {
+ error ("unknown value %qs for %<-mstp-policy%>", str);
+ return false;
+ }
+
+ return true;
+}
+
/* Parse TOKEN, which has length LENGTH to see if it is an option
described in FLAG. If it is, return the index bit for that fusion type.
If not, error (printing OPTION_NAME) and return zero. */
@@ -17993,6 +18084,14 @@ aarch64_override_options_internal (struct gcc_options *opts)
aarch64_parse_override_string (opts->x_aarch64_override_tune_string,
&aarch64_tune_params);
+ if (opts->x_aarch64_ldp_policy_string)
+ aarch64_parse_ldp_policy (opts->x_aarch64_ldp_policy_string,
+ &aarch64_tune_params);
+
+ if (opts->x_aarch64_stp_policy_string)
+ aarch64_parse_stp_policy (opts->x_aarch64_stp_policy_string,
+ &aarch64_tune_params);
+
/* This target defaults to strict volatile bitfields. */
if (opts->x_flag_strict_volatile_bitfields < 0 && abi_version_at_least (2))
opts->x_flag_strict_volatile_bitfields = 1;
@@ -26301,18 +26400,14 @@ aarch64_operands_ok_for_ldpstp (rtx *operands, bool load,
enum reg_class rclass_1, rclass_2;
rtx mem_1, mem_2, reg_1, reg_2;
- /* Allow the tuning structure to disable LDP instruction formation
- from combining instructions (e.g., in peephole2).
- TODO: Implement fine-grained tuning control for LDP and STP:
- 1. control policies for load and store separately;
- 2. support the following policies:
- - default (use what is in the tuning structure)
- - always
- - never
- - aligned (only if the compiler can prove that the
- load will be aligned to 2 * element_size) */
- if (load && (aarch64_tune_params.extra_tuning_flags
- & AARCH64_EXTRA_TUNE_NO_LDP_COMBINE))
+ /* If we have LDP_POLICY_NEVER, reject the load pair. */
+ if (load
+ && aarch64_tune_params.ldp_policy_model == tune_params::LDP_POLICY_NEVER)
+ return false;
+
+ /* If we have STP_POLICY_NEVER, reject the store pair. */
+ if (!load
+ && aarch64_tune_params.stp_policy_model == tune_params::STP_POLICY_NEVER)
return false;
if (load)
@@ -26339,13 +26434,22 @@ aarch64_operands_ok_for_ldpstp (rtx *operands, bool load,
if (MEM_VOLATILE_P (mem_1) || MEM_VOLATILE_P (mem_2))
return false;
- /* If we have SImode and slow unaligned ldp,
- check the alignment to be at least 8 byte. */
- if (mode == SImode
- && (aarch64_tune_params.extra_tuning_flags
- & AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW)
+ /* If we have LDP_POLICY_ALIGNED,
+ do not emit the load pair unless the alignment is checked to be
+ at least double the alignment of the type. */
+ if (load
+ && aarch64_tune_params.ldp_policy_model == tune_params::LDP_POLICY_ALIGNED
&& !optimize_size
- && MEM_ALIGN (mem_1) < 8 * BITS_PER_UNIT)
+ && MEM_ALIGN (mem_1) < 2 * GET_MODE_ALIGNMENT (mode))
+ return false;
+
+ /* If we have STP_POLICY_ALIGNED,
+ do not emit the store pair unless the alignment is checked to be
+ at least double the alignment of the type. */
+ if (!load
+ && aarch64_tune_params.stp_policy_model == tune_params::STP_POLICY_ALIGNED
+ && !optimize_size
+ && MEM_ALIGN (mem_1) < 2 * GET_MODE_ALIGNMENT (mode))
return false;
/* Check if the addresses are in the form of [base+offset]. */
@@ -26475,6 +26579,16 @@ aarch64_operands_adjust_ok_for_ldpstp (rtx *operands, bool load,
HOST_WIDE_INT offvals[num_insns], msize;
rtx mem[num_insns], reg[num_insns], base[num_insns], offset[num_insns];
+ /* If we have LDP_POLICY_NEVER, reject the load pair. */
+ if (load
+ && aarch64_tune_params.ldp_policy_model == tune_params::LDP_POLICY_NEVER)
+ return false;
+
+ /* If we have STP_POLICY_NEVER, reject the store pair. */
+ if (!load
+ && aarch64_tune_params.stp_policy_model == tune_params::STP_POLICY_NEVER)
+ return false;
+
if (load)
{
for (int i = 0; i < num_insns; i++)
@@ -26564,13 +26678,22 @@ aarch64_operands_adjust_ok_for_ldpstp (rtx *operands, bool load,
if (offvals[0] % msize != offvals[2] % msize)
return false;
- /* If we have SImode and slow unaligned ldp,
- check the alignment to be at least 8 byte. */
- if (mode == SImode
- && (aarch64_tune_params.extra_tuning_flags
- & AARCH64_EXTRA_TUNE_SLOW_UNALIGNED_LDPW)
+ /* If we have LDP_POLICY_ALIGNED,
+ do not emit the load pair unless the alignment is checked to be
+ at least double the alignment of the type. */
+ if (load
+ && aarch64_tune_params.ldp_policy_model == tune_params::LDP_POLICY_ALIGNED
+ && !optimize_size
+ && MEM_ALIGN (mem[0]) < 2 * GET_MODE_ALIGNMENT (mode))
+ return false;
+
+ /* If we have STP_POLICY_ALIGNED,
+ do not emit the store pair unless the alignment is checked to be
+ at least double the alignment of the type. */
+ if (!load
+ && aarch64_tune_params.stp_policy_model == tune_params::STP_POLICY_ALIGNED
&& !optimize_size
- && MEM_ALIGN (mem[0]) < 8 * BITS_PER_UNIT)
+ && MEM_ALIGN (mem[0]) < 2 * GET_MODE_ALIGNMENT (mode))
return false;
return true;
@@ -205,6 +205,14 @@ msign-return-address=
Target WarnRemoved RejectNegative Joined Enum(aarch_ra_sign_scope_t) Var(aarch_ra_sign_scope) Init(AARCH_FUNCTION_NONE) Save
Select return address signing scope.
+mldp-policy=
+Target RejectNegative Joined Var(aarch64_ldp_policy_string) Save
+Fine-grained policy for load pairs.
+
+mstp-policy=
+Target RejectNegative Joined Var(aarch64_stp_policy_string) Save
+Fine-grained policy for store pairs.
+
Enum
Name(aarch_ra_sign_scope_t) Type(enum aarch_function_type)
Supported AArch64 return address signing scope (for use with -msign-return-address= option):
new file mode 100644
@@ -0,0 +1,64 @@
+/* { dg-options "-O3 -mldp-policy=aligned" } */
+
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef int v4si __attribute__ ((vector_size (16)));
+
+#define LDP_TEST_ALIGNED(TYPE) \
+TYPE ldp_aligned_##TYPE(char* ptr){ \
+ TYPE a_0, a_1; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ a_0 = arr[0]; \
+ a_1 = arr[1]; \
+ return a_0 + a_1; \
+}
+
+#define LDP_TEST_UNALIGNED(TYPE) \
+TYPE ldp_unaligned_##TYPE(char* ptr){ \
+ TYPE a_0, a_1; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a_0 = a[0]; \
+ a_1 = a[1]; \
+ return a_0 + a_1; \
+}
+
+#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
+TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
+ TYPE a_0, a_1, a_2, a_3; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ a_0 = arr[100]; \
+ a_1 = arr[101]; \
+ a_2 = arr[102]; \
+ a_3 = arr[103]; \
+ return a_0 + a_1 + a_2 + a_3; \
+}
+
+#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
+TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
+ TYPE a_0, a_1, a_2, a_3; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a_0 = a[100]; \
+ a_1 = a[101]; \
+ a_2 = a[102]; \
+ a_3 = a[103]; \
+ return a_0 + a_1 + a_2 + a_3; \
+}
+
+LDP_TEST_ALIGNED(int32_t);
+LDP_TEST_ALIGNED(int64_t);
+LDP_TEST_ALIGNED(v4si);
+LDP_TEST_UNALIGNED(int32_t);
+LDP_TEST_UNALIGNED(int64_t);
+LDP_TEST_UNALIGNED(v4si);
+LDP_TEST_ADJUST_ALIGNED(int32_t);
+LDP_TEST_ADJUST_ALIGNED(int64_t);
+LDP_TEST_ADJUST_UNALIGNED(int32_t);
+LDP_TEST_ADJUST_UNALIGNED(int64_t);
+
+/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 3 } } */
+/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 3 } } */
+/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 1 } } */
+
new file mode 100644
@@ -0,0 +1,64 @@
+/* { dg-options "-O3 -mldp-policy=always" } */
+
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef int v4si __attribute__ ((vector_size (16)));
+
+#define LDP_TEST_ALIGNED(TYPE) \
+TYPE ldp_aligned_##TYPE(char* ptr){ \
+ TYPE a_0, a_1; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ a_0 = arr[0]; \
+ a_1 = arr[1]; \
+ return a_0 + a_1; \
+}
+
+#define LDP_TEST_UNALIGNED(TYPE) \
+TYPE ldp_unaligned_##TYPE(char* ptr){ \
+ TYPE a_0, a_1; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a_0 = a[0]; \
+ a_1 = a[1]; \
+ return a_0 + a_1; \
+}
+
+#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
+TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
+ TYPE a_0, a_1, a_2, a_3; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ a_0 = arr[100]; \
+ a_1 = arr[101]; \
+ a_2 = arr[102]; \
+ a_3 = arr[103]; \
+ return a_0 + a_1 + a_2 + a_3; \
+}
+
+#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
+TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
+ TYPE a_0, a_1, a_2, a_3; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a_0 = a[100]; \
+ a_1 = a[101]; \
+ a_2 = a[102]; \
+ a_3 = a[103]; \
+ return a_0 + a_1 + a_2 + a_3; \
+}
+
+LDP_TEST_ALIGNED(int32_t);
+LDP_TEST_ALIGNED(int64_t);
+LDP_TEST_ALIGNED(v4si);
+LDP_TEST_UNALIGNED(int32_t);
+LDP_TEST_UNALIGNED(int64_t);
+LDP_TEST_UNALIGNED(v4si);
+LDP_TEST_ADJUST_ALIGNED(int32_t);
+LDP_TEST_ADJUST_ALIGNED(int64_t);
+LDP_TEST_ADJUST_UNALIGNED(int32_t);
+LDP_TEST_ADJUST_UNALIGNED(int64_t);
+
+/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 6 } } */
+/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 6 } } */
+/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 2 } } */
+
new file mode 100644
@@ -0,0 +1,64 @@
+/* { dg-options "-O3 -mldp-policy=never" } */
+
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef int v4si __attribute__ ((vector_size (16)));
+
+#define LDP_TEST_ALIGNED(TYPE) \
+TYPE ldp_aligned_##TYPE(char* ptr){ \
+ TYPE a_0, a_1; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ a_0 = arr[0]; \
+ a_1 = arr[1]; \
+ return a_0 + a_1; \
+}
+
+#define LDP_TEST_UNALIGNED(TYPE) \
+TYPE ldp_unaligned_##TYPE(char* ptr){ \
+ TYPE a_0, a_1; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a_0 = a[0]; \
+ a_1 = a[1]; \
+ return a_0 + a_1; \
+}
+
+#define LDP_TEST_ADJUST_ALIGNED(TYPE) \
+TYPE ldp_aligned_adjust_##TYPE(char* ptr){ \
+ TYPE a_0, a_1, a_2, a_3; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ a_0 = arr[100]; \
+ a_1 = arr[101]; \
+ a_2 = arr[102]; \
+ a_3 = arr[103]; \
+ return a_0 + a_1 + a_2 + a_3; \
+}
+
+#define LDP_TEST_ADJUST_UNALIGNED(TYPE) \
+TYPE ldp_unaligned_adjust_##TYPE(char* ptr){ \
+ TYPE a_0, a_1, a_2, a_3; \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a_0 = a[100]; \
+ a_1 = a[101]; \
+ a_2 = a[102]; \
+ a_3 = a[103]; \
+ return a_0 + a_1 + a_2 + a_3; \
+}
+
+LDP_TEST_ALIGNED(int32_t);
+LDP_TEST_ALIGNED(int64_t);
+LDP_TEST_ALIGNED(v4si);
+LDP_TEST_UNALIGNED(int32_t);
+LDP_TEST_UNALIGNED(int64_t);
+LDP_TEST_UNALIGNED(v4si);
+LDP_TEST_ADJUST_ALIGNED(int32_t);
+LDP_TEST_ADJUST_ALIGNED(int64_t);
+LDP_TEST_ADJUST_UNALIGNED(int32_t);
+LDP_TEST_ADJUST_UNALIGNED(int64_t);
+
+/* { dg-final { scan-assembler-times "ldp\tw\[0-9\]+, w\[0-9\]" 0 } } */
+/* { dg-final { scan-assembler-times "ldp\tx\[0-9\]+, x\[0-9\]" 0 } } */
+/* { dg-final { scan-assembler-times "ldp\tq\[0-9\]+, q\[0-9\]" 0 } } */
+
new file mode 100644
@@ -0,0 +1,60 @@
+/* { dg-options "-O3 -mstp-policy=aligned" } */
+
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef int v4si __attribute__ ((vector_size (16)));
+
+#define STP_TEST_ALIGNED(TYPE) \
+TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ arr[0] = x; \
+ arr[1] = x; \
+ return arr; \
+}
+
+#define STP_TEST_UNALIGNED(TYPE) \
+TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a[0] = x; \
+ a[1] = x; \
+ return a; \
+}
+
+#define STP_TEST_ADJUST_ALIGNED(TYPE) \
+TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ arr[100] = x; \
+ arr[101] = x; \
+ arr[102] = x; \
+ arr[103] = x; \
+ return arr; \
+}
+
+#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
+TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a[100] = x; \
+ a[101] = x; \
+ a[102] = x; \
+ a[103] = x; \
+ return a; \
+}
+
+STP_TEST_ALIGNED(int32_t);
+STP_TEST_ALIGNED(int64_t);
+STP_TEST_ALIGNED(v4si);
+STP_TEST_UNALIGNED(int32_t);
+STP_TEST_UNALIGNED(int64_t);
+STP_TEST_UNALIGNED(v4si);
+STP_TEST_ADJUST_ALIGNED(int32_t);
+STP_TEST_ADJUST_ALIGNED(int64_t);
+STP_TEST_ADJUST_UNALIGNED(int32_t);
+STP_TEST_ADJUST_UNALIGNED(int64_t);
+
+/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 3 } } */
+/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 3 } } */
+/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 1 } } */
+
new file mode 100644
@@ -0,0 +1,60 @@
+/* { dg-options "-O3 -mstp-policy=always" } */
+
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef int v4si __attribute__ ((vector_size (16)));
+
+#define STP_TEST_ALIGNED(TYPE) \
+TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ arr[0] = x; \
+ arr[1] = x; \
+ return arr; \
+}
+
+#define STP_TEST_UNALIGNED(TYPE) \
+TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a[0] = x; \
+ a[1] = x; \
+ return a; \
+}
+
+#define STP_TEST_ADJUST_ALIGNED(TYPE) \
+TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ arr[100] = x; \
+ arr[101] = x; \
+ arr[102] = x; \
+ arr[103] = x; \
+ return arr; \
+}
+
+#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
+TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a[100] = x; \
+ a[101] = x; \
+ a[102] = x; \
+ a[103] = x; \
+ return a; \
+}
+
+STP_TEST_ALIGNED(int32_t);
+STP_TEST_ALIGNED(int64_t);
+STP_TEST_ALIGNED(v4si);
+STP_TEST_UNALIGNED(int32_t);
+STP_TEST_UNALIGNED(int64_t);
+STP_TEST_UNALIGNED(v4si);
+STP_TEST_ADJUST_ALIGNED(int32_t);
+STP_TEST_ADJUST_ALIGNED(int64_t);
+STP_TEST_ADJUST_UNALIGNED(int32_t);
+STP_TEST_ADJUST_UNALIGNED(int64_t);
+
+/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 6 } } */
+/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 6 } } */
+/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 2 } } */
+
new file mode 100644
@@ -0,0 +1,60 @@
+/* { dg-options "-O3 -mstp-policy=never" } */
+
+#include <stdlib.h>
+#include <stdint.h>
+
+typedef int v4si __attribute__ ((vector_size (16)));
+
+#define STP_TEST_ALIGNED(TYPE) \
+TYPE *stp_aligned_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ arr[0] = x; \
+ arr[1] = x; \
+ return arr; \
+}
+
+#define STP_TEST_UNALIGNED(TYPE) \
+TYPE *stp_unaligned_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a[0] = x; \
+ a[1] = x; \
+ return a; \
+}
+
+#define STP_TEST_ADJUST_ALIGNED(TYPE) \
+TYPE *stp_aligned_adjust_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ arr[100] = x; \
+ arr[101] = x; \
+ arr[102] = x; \
+ arr[103] = x; \
+ return arr; \
+}
+
+#define STP_TEST_ADJUST_UNALIGNED(TYPE) \
+TYPE *stp_unaligned_adjust_##TYPE(char* ptr, TYPE x){ \
+ TYPE *arr = (TYPE*) ((uintptr_t)ptr & ~(2 * 8 * _Alignof(TYPE) - 1)); \
+ TYPE *a = arr+1; \
+ a[100] = x; \
+ a[101] = x; \
+ a[102] = x; \
+ a[103] = x; \
+ return a; \
+}
+
+STP_TEST_ALIGNED(int32_t);
+STP_TEST_ALIGNED(int64_t);
+STP_TEST_ALIGNED(v4si);
+STP_TEST_UNALIGNED(int32_t);
+STP_TEST_UNALIGNED(int64_t);
+STP_TEST_UNALIGNED(v4si);
+STP_TEST_ADJUST_ALIGNED(int32_t);
+STP_TEST_ADJUST_ALIGNED(int64_t);
+STP_TEST_ADJUST_UNALIGNED(int32_t);
+STP_TEST_ADJUST_UNALIGNED(int64_t);
+
+/* { dg-final { scan-assembler-times "stp\tw\[0-9\]+, w\[0-9\]" 0 } } */
+/* { dg-final { scan-assembler-times "stp\tx\[0-9\]+, x\[0-9\]" 0 } } */
+/* { dg-final { scan-assembler-times "stp\tq\[0-9\]+, q\[0-9\]" 0 } } */
+