Patchwork [v3] PPC64: Add libmvec SIMD double-precision natural exponent function.

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Submitter Shawn Landden
Date May 29, 2019, 7:11 p.m.
Message ID <20190529191106.23888-1-shawn@git.icu>
Download mbox | patch
Permalink /patch/32905/
State New
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Comments

Shawn Landden - May 29, 2019, 7:11 p.m.
Passes all tests.

Unlike other libmvec functions, this sets the underflow and overflow bits.
The caller can check these flags, and possibly re-run the calculations with
scalar expf to figure out what is causing the overflow or underflow.

The special-case path is not vectorized, and performs much worse than
the scalar code.
Normalized data: 1 to 2^32 converted to double
Running 20 times over 32MiB
vector: mean 563.807107 MiB/s (sd 0.390922)
scalar: mean 226.527824 MiB/s (sd 0.077406)

Random data:
vector: mean 80.175986 MiB/s (sd 1.110948)
scalar: mean 244.738130 MiB/s (sd 0.029561)

v2: Fix some serious problems with the algorithm. Not
    sure how I missed those problems.
v3: Style problems.  Fix symbol order.

2019-05-11  Shawn Landden  <shawn@git.icu>

	[BZ #24209]
	* NEWS: Noted the addition of PPC64 vector exp function.
	* sysdeps/powerpc/bits/math-vector.h: Added entry for vector exp.
	* sysdeps/powerpc/powerpc64/fpu/Versions: Added vector exp entry.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile:
	(libmvec-sysdep_routines, CFLAGS-vec_d_exp2_vsx.c):
	(CFLAGS-vec_d_exp_data.c): Added build of VSX SIMD expf
	function and tests. Added vec_math_err.c to build.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/(math_config.h)->(math_config_dbl.h)
	Renamed, and modified for exp.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c:
	Added entry for vector exp.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c: New file.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c: Likewise.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist: SIMD expf
	added.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c: Rename of math_config.h
	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c: Likewise
---
 NEWS                                          |   1 +
 sysdeps/powerpc/bits/math-vector.h            |   2 +
 sysdeps/powerpc/powerpc64/fpu/Versions        |   2 +-
 .../powerpc/powerpc64/fpu/multiarch/Makefile  |   8 +-
 .../{math_config.h => math_config_dbl.h}      |  15 +-
 .../multiarch/test-double-vlen2-wrappers.c    |   1 +
 .../powerpc64/fpu/multiarch/vec_d_exp2_vsx.c  | 197 +++++++++++++++++
 .../powerpc64/fpu/multiarch/vec_d_exp_data.c  | 202 ++++++++++++++++++
 .../powerpc64/fpu/multiarch/vec_d_log2_vsx.c  |   2 +-
 .../powerpc64/fpu/multiarch/vec_d_log_data.c  |   2 +-
 .../powerpc64/fpu/multiarch/vec_math_err.c    |  40 ++++
 .../linux/powerpc/powerpc64/libmvec.abilist   |   1 +
 12 files changed, 461 insertions(+), 12 deletions(-)
 rename sysdeps/powerpc/powerpc64/fpu/multiarch/{math_config.h => math_config_dbl.h} (95%)
 create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
 create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
 create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
Shawn Landden - May 29, 2019, 7:12 p.m.
On Wed, May 29, 2019 at 2:11 PM Shawn Landden <shawn@git.icu> wrote:
>
> Passes all tests.
I change this but forgot to regenerate the patch. I am getting a bunch
of seemingly unrelated test failures.
FAIL: dlfcn/bug-atexit3
FAIL: elf/check-abi-libc
XPASS: elf/tst-protected1a
XPASS: elf/tst-protected1b
FAIL: elf/tst-unwind-main
FAIL: iconv/tst-iconv-mt
FAIL: inet/tst-idna_name_classify
FAIL: malloc/tst-malloc-stats-cancellation
UNSUPPORTED: math/test-fesetexcept-traps
UNSUPPORTED: math/test-fexcept-traps
FAIL: misc/tst-gettid-kill
FAIL: misc/tst-pkey
UNSUPPORTED: nptl/test-cond-printers
UNSUPPORTED: nptl/test-condattr-printers
FAIL: nptl/test-get_hwcap
UNSUPPORTED: nptl/test-mutex-printers
UNSUPPORTED: nptl/test-mutexattr-printers
UNSUPPORTED: nptl/test-rwlock-printers
UNSUPPORTED: nptl/test-rwlockattr-printers
FAIL: nptl/tst-basic3
FAIL: nptl/tst-basic4
FAIL: nptl/tst-call-once
FAIL: nptl/tst-cancel-self
FAIL: nptl/tst-cancel-self-cancelstate
FAIL: nptl/tst-cancel-self-canceltype
FAIL: nptl/tst-cancel-self-testcancel
FAIL: nptl/tst-cancel1
FAIL: nptl/tst-cancel10
FAIL: nptl/tst-cancel11
FAIL: nptl/tst-cancel12
FAIL: nptl/tst-cancel13
FAIL: nptl/tst-cancel14
FAIL: nptl/tst-cancel15
FAIL: nptl/tst-cancel16
FAIL: nptl/tst-cancel17
FAIL: nptl/tst-cancel18
FAIL: nptl/tst-cancel2
FAIL: nptl/tst-cancel20
FAIL: nptl/tst-cancel21
FAIL: nptl/tst-cancel22
FAIL: nptl/tst-cancel23
FAIL: nptl/tst-cancel24
FAIL: nptl/tst-cancel25
FAIL: nptl/tst-cancel3
FAIL: nptl/tst-cancel4
FAIL: nptl/tst-cancel4_1
FAIL: nptl/tst-cancel4_2
FAIL: nptl/tst-cancel5
FAIL: nptl/tst-cancel6
FAIL: nptl/tst-cancel7
FAIL: nptl/tst-cancel8
FAIL: nptl/tst-cancel9
FAIL: nptl/tst-cancelx10
FAIL: nptl/tst-cancelx11
FAIL: nptl/tst-cancelx12
FAIL: nptl/tst-cancelx13
FAIL: nptl/tst-cancelx14
FAIL: nptl/tst-cancelx15
FAIL: nptl/tst-cancelx16
FAIL: nptl/tst-cancelx17
FAIL: nptl/tst-cancelx18
FAIL: nptl/tst-cancelx2
FAIL: nptl/tst-cancelx20
FAIL: nptl/tst-cancelx21
FAIL: nptl/tst-cancelx3
FAIL: nptl/tst-cancelx4
FAIL: nptl/tst-cancelx5
FAIL: nptl/tst-cancelx6
FAIL: nptl/tst-cancelx7
FAIL: nptl/tst-cancelx8
FAIL: nptl/tst-cancelx9
FAIL: nptl/tst-cleanup0
FAIL: nptl/tst-cleanup0-cmp
FAIL: nptl/tst-cleanup1
FAIL: nptl/tst-cleanup3
FAIL: nptl/tst-cleanup4
FAIL: nptl/tst-cleanupx0
FAIL: nptl/tst-cleanupx1
FAIL: nptl/tst-cleanupx3
FAIL: nptl/tst-cleanupx4
FAIL: nptl/tst-cnd-basic
FAIL: nptl/tst-cnd-broadcast
FAIL: nptl/tst-cnd-timedwait
FAIL: nptl/tst-cond-except
FAIL: nptl/tst-cond22
FAIL: nptl/tst-cond25
FAIL: nptl/tst-cond7
FAIL: nptl/tst-cond8
FAIL: nptl/tst-default-attr
FAIL: nptl/tst-exec5
FAIL: nptl/tst-execstack
FAIL: nptl/tst-exit2
FAIL: nptl/tst-exit3
FAIL: nptl/tst-fini1
FAIL: nptl/tst-join1
FAIL: nptl/tst-join5
FAIL: nptl/tst-join6
FAIL: nptl/tst-join8
FAIL: nptl/tst-join9
FAIL: nptl/tst-key3
FAIL: nptl/tst-minstack-cancel
FAIL: nptl/tst-minstack-exit
FAIL: nptl/tst-minstack-throw
FAIL: nptl/tst-mtx-basic
FAIL: nptl/tst-mtx-timedlock
FAIL: nptl/tst-mtx-trylock
FAIL: nptl/tst-mutex8
FAIL: nptl/tst-mutexpi8
FAIL: nptl/tst-once3
FAIL: nptl/tst-once4
FAIL: nptl/tst-oncex3
FAIL: nptl/tst-oncex4
FAIL: nptl/tst-robust1
FAIL: nptl/tst-robust2
FAIL: nptl/tst-robust3
FAIL: nptl/tst-robust4
FAIL: nptl/tst-robust5
FAIL: nptl/tst-robust6
FAIL: nptl/tst-robust7
FAIL: nptl/tst-robustpi1
FAIL: nptl/tst-robustpi2
FAIL: nptl/tst-robustpi3
FAIL: nptl/tst-robustpi4
FAIL: nptl/tst-robustpi5
FAIL: nptl/tst-robustpi6
FAIL: nptl/tst-robustpi7
FAIL: nptl/tst-sem11
FAIL: nptl/tst-sem12
FAIL: nptl/tst-sem16
FAIL: nptl/tst-stack4
FAIL: nptl/tst-thrd-detach
FAIL: nptl/tst-thrd-sleep
FAIL: nptl/tst-thread-exit-clobber
FAIL: nptl/tst-thread_local1
FAIL: nptl/tst-tsd5
FAIL: nptl/tst-tss-basic
FAIL: nptl/tst-unwind-thread
FAIL: nss/tst-cancel-getpwuid_r
FAIL: nss/tst-nss-files-hosts-long
FAIL: nss/tst-nss-test3
FAIL: posix/tst-getopt-cancel
UNSUPPORTED: posix/tst-spawn4-compat
UNSUPPORTED: resolv/tst-resolv-ai_idn
UNSUPPORTED: resolv/tst-resolv-ai_idn-latin1
FAIL: rt/tst-cpuclock2
FAIL: rt/tst-mqueue8
FAIL: rt/tst-mqueue8x
FAIL: rt/tst-shm-cancel
FAIL: stdlib/tst-quick_exit
FAIL: stdlib/tst-thread-quick_exit

>
> Unlike other libmvec functions, this sets the underflow and overflow bits.
> The caller can check these flags, and possibly re-run the calculations with
> scalar expf to figure out what is causing the overflow or underflow.
>
> The special-case path is not vectorized, and performs much worse than
> the scalar code.
> Normalized data: 1 to 2^32 converted to double
> Running 20 times over 32MiB
> vector: mean 563.807107 MiB/s (sd 0.390922)
> scalar: mean 226.527824 MiB/s (sd 0.077406)
>
> Random data:
> vector: mean 80.175986 MiB/s (sd 1.110948)
> scalar: mean 244.738130 MiB/s (sd 0.029561)
>
> v2: Fix some serious problems with the algorithm. Not
>     sure how I missed those problems.
> v3: Style problems.  Fix symbol order.
>
> 2019-05-11  Shawn Landden  <shawn@git.icu>
>
>         [BZ #24209]
>         * NEWS: Noted the addition of PPC64 vector exp function.
>         * sysdeps/powerpc/bits/math-vector.h: Added entry for vector exp.
>         * sysdeps/powerpc/powerpc64/fpu/Versions: Added vector exp entry.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile:
>         (libmvec-sysdep_routines, CFLAGS-vec_d_exp2_vsx.c):
>         (CFLAGS-vec_d_exp_data.c): Added build of VSX SIMD expf
>         function and tests. Added vec_math_err.c to build.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/(math_config.h)->(math_config_dbl.h)
>         Renamed, and modified for exp.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c:
>         Added entry for vector exp.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c: New file.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c: Likewise.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c: Likewise.
>         * sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist: SIMD expf
>         added.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c: Rename of math_config.h
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c: Likewise
> ---
>  NEWS                                          |   1 +
>  sysdeps/powerpc/bits/math-vector.h            |   2 +
>  sysdeps/powerpc/powerpc64/fpu/Versions        |   2 +-
>  .../powerpc/powerpc64/fpu/multiarch/Makefile  |   8 +-
>  .../{math_config.h => math_config_dbl.h}      |  15 +-
>  .../multiarch/test-double-vlen2-wrappers.c    |   1 +
>  .../powerpc64/fpu/multiarch/vec_d_exp2_vsx.c  | 197 +++++++++++++++++
>  .../powerpc64/fpu/multiarch/vec_d_exp_data.c  | 202 ++++++++++++++++++
>  .../powerpc64/fpu/multiarch/vec_d_log2_vsx.c  |   2 +-
>  .../powerpc64/fpu/multiarch/vec_d_log_data.c  |   2 +-
>  .../powerpc64/fpu/multiarch/vec_math_err.c    |  40 ++++
>  .../linux/powerpc/powerpc64/libmvec.abilist   |   1 +
>  12 files changed, 461 insertions(+), 12 deletions(-)
>  rename sysdeps/powerpc/powerpc64/fpu/multiarch/{math_config.h => math_config_dbl.h} (95%)
>  create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
>  create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
>  create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
>
> diff --git a/NEWS b/NEWS
> index 26f5c67f75..a33af8c316 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -20,6 +20,7 @@ Major new features:
>    - single-precision sine: sinf
>    - double-precision sincos: sincos
>    - single-precision sincos: sincosf
> +  - double-precision exp: exp
>    - single-precision exp: expf
>
>    GCC support for auto-vectorization of functions on PPC64 is not yet
> diff --git a/sysdeps/powerpc/bits/math-vector.h b/sysdeps/powerpc/bits/math-vector.h
> index bbc9db0dd9..e7846b4bfa 100644
> --- a/sysdeps/powerpc/bits/math-vector.h
> +++ b/sysdeps/powerpc/bits/math-vector.h
> @@ -46,6 +46,8 @@
>  #  define __DECL_SIMD_sincosf __DECL_SIMD_PPC64
>  #  undef __DECL_SIMD_expf
>  #  define __DECL_SIMD_expf __DECL_SIMD_PPC64
> +#  undef __DECL_SIMD_exp
> +#  define __DECL_SIMD_exp __DECL_SIMD_PPC64
>
>  # endif
>  #endif
> diff --git a/sysdeps/powerpc/powerpc64/fpu/Versions b/sysdeps/powerpc/powerpc64/fpu/Versions
> index 7c45e76074..361edee9e7 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/Versions
> +++ b/sysdeps/powerpc/powerpc64/fpu/Versions
> @@ -2,6 +2,6 @@ libmvec {
>    GLIBC_2.30 {
>      _ZGVbN2v_cos; _ZGVbN4v_cosf; _ZGVbN2v_sin; _ZGVbN4v_sinf;
>      _ZGVbN2v_log; _ZGVbN4v_logf; _ZGVbN2vvv_sincos; _ZGVbN4vvv_sincosf;
> -    _ZGVbN4v_expf;
> +    _ZGVbN4v_expf; _ZGVbN2v_exp;
>    }
>  }
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
> index d15183d5ee..dd982bb068 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
> @@ -49,7 +49,8 @@ libmvec-sysdep_routines += vec_d_cos2_vsx vec_s_cosf4_vsx \
>                            vec_d_log2_vsx vec_d_log_data \
>                            vec_s_logf4_vsx vec_s_logf_data \
>                            vec_s_expf4_vsx vec_s_exp2f_data \
> -                          vec_math_errf \
> +                          vec_math_errf vec_math_err \
> +                          vec_d_exp2_vsx vec_d_exp_data \
>                            vec_d_sincos2_vsx vec_s_sincosf4_vsx
>  CFLAGS-vec_d_cos2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
>  CFLAGS-vec_d_log2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
> @@ -64,6 +65,9 @@ CFLAGS-vec_d_sincos2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
>  CFLAGS-vec_s_sincosf4_vsx.c += -mabi=altivec -maltivec -mvsx
>  CFLAGS-vec_s_expf4_vsx.c += -mabi=altivec -maltivec -mvsx
>  CFLAGS-vec_s_exp2f_data.c += -mabi=altivec -maltivec -mvsx
> +CFLAGS-vec_d_exp2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
> +CFLAGS-vec_d_exp_data.c += -mabi=altivec -maltivec -mvsx
> +CFLAGS-vec_math_err.c += -mabi=altivec -maltivec -mvsx
>  endif
>
>  # Variables for libmvec tests.
> @@ -71,7 +75,7 @@ ifeq ($(subdir),math)
>  ifeq ($(build-mathvec),yes)
>  libmvec-tests += double-vlen2 float-vlen4
>
> -double-vlen2-funcs = cos sin sincos log
> +double-vlen2-funcs = cos sin sincos log exp
>  float-vlen4-funcs = cos sin sincos log exp
>
>  double-vlen2-arch-ext-cflags = -mabi=altivec -maltivec -mvsx -DREQUIRE_VSX
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h b/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
> similarity index 95%
> rename from sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h
> rename to sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
> index bd37906ecb..7c94f5b9b2 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
> @@ -24,6 +24,7 @@
>  #include <nan-high-order-bit.h>
>  #include <stdint.h>
>  #include <altivec.h>
> +#include <math-narrow-eval.h>
>
>  #ifndef WANT_ROUNDING
>  /* Correct special case results in non-nearest rounding modes.  */
> @@ -134,13 +135,13 @@ check_uflow (double x)
>  #define EXP2_POLY_ORDER 5
>  extern const struct exp_data
>  {
> -  double invln2N;
> -  double shift;
> -  double negln2hiN;
> -  double negln2loN;
> -  double poly[4]; /* Last four coefficients.  */
> -  double exp2_shift;
> -  double exp2_poly[EXP2_POLY_ORDER];
> +  vector double invln2N;
> +  vector double shift;
> +  vector double negln2hiN;
> +  vector double negln2loN;
> +  vector double poly[4]; /* Last four coefficients.  */
> +  vector double exp2_shift;
> +  vector double exp2_poly[EXP2_POLY_ORDER];
>    uint64_t tab[2*(1 << EXP_TABLE_BITS)];
>  } __exp_data attribute_hidden;
>
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
> index c9e2dbfdd0..f368e47947 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
> @@ -24,4 +24,5 @@
>  VECTOR_WRAPPER (WRAPPER_NAME (cos), _ZGVbN2v_cos)
>  VECTOR_WRAPPER (WRAPPER_NAME (sin), _ZGVbN2v_sin)
>  VECTOR_WRAPPER (WRAPPER_NAME (log), _ZGVbN2v_log)
> +VECTOR_WRAPPER (WRAPPER_NAME (exp), _ZGVbN2v_exp)
>  VECTOR_WRAPPER_fFF (WRAPPER_NAME (sincos), _ZGVbN2vvv_sincos)
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
> new file mode 100644
> index 0000000000..376531e32b
> --- /dev/null
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
> @@ -0,0 +1,197 @@
> +/* Double-precision vector exp(x) function.
> +   Copyright (C) 2019 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +/* Based on sysdeps/ieee754/dbl-64/e_exp.c which came from
> +   Szabolcs Nagy at ARM Ltd. */
> +#include <altivec.h>
> +#include <math.h>
> +#include <math-barriers.h>
> +#include <math-narrow-eval.h>
> +
> +#include "math_config_dbl.h"
> +
> +typedef vector long long unsigned v64u;
> +typedef union {
> +  vector unsigned u;
> +  vector float f;
> +  v64u l;
> +  vector double d;
> +} u;
> +typedef union {
> +  double d;
> +  uint64_t l;
> +  unsigned u;
> +  float f;
> +} us;
> +
> +#define N (1 << EXP_TABLE_BITS)
> +#define InvLn2N __exp_data.invln2N
> +#define NegLn2hiN __exp_data.negln2hiN
> +#define NegLn2loN __exp_data.negln2loN
> +#define Shift __exp_data.shift
> +#define T __exp_data.tab
> +#define C2 __exp_data.poly[5 - EXP_POLY_ORDER]
> +#define C3 __exp_data.poly[6 - EXP_POLY_ORDER]
> +#define C4 __exp_data.poly[7 - EXP_POLY_ORDER]
> +#define C5 __exp_data.poly[8 - EXP_POLY_ORDER]
> +
> +/* Handle cases that may overflow or underflow when computing the result that
> +   is scale*(1+TMP) without intermediate rounding.  The bit representation of
> +   scale is in SBITS, however it has a computed exponent that may have
> +   overflown into the sign bit so that needs to be adjusted before using it as
> +   a double.  (int32_t)KI is the k used in the argument reduction and exponent
> +   adjustment of scale, positive k here means the result may overflow and
> +   negative k means the result may underflow.  */
> +static inline double
> +specialcase (double_t tmp, uint64_t sbits, uint64_t ki)
> +{
> +  double_t scale, y;
> +
> +  if ((ki & 0x80000000) == 0)
> +    {
> +      /* k > 0, the exponent of scale might have overflowed by <= 460.  */
> +      sbits -= 1009ull << 52;
> +      scale = asdouble (sbits);
> +      y = 0x1p1009 * (scale + scale * tmp);
> +      return y;
> +    }
> +  /* k < 0, need special care in the subnormal range.  */
> +  sbits += 1022ull << 52;
> +  scale = asdouble (sbits);
> +  y = scale + scale * tmp;
> +  if (y < 1.0)
> +    {
> +      /* Round y to the right precision before scaling it into the subnormal
> +        range to avoid double rounding that can cause 0.5+E/2 ulp error where
> +        E is the worst-case ulp error outside the subnormal range.  So this
> +        is only useful if the goal is better than 1 ulp worst-case error.  */
> +      double_t hi, lo;
> +      lo = scale - y + scale * tmp;
> +      hi = 1.0 + y;
> +      lo = 1.0 - hi + y + lo;
> +      y = math_narrow_eval (hi + lo) - 1.0;
> +      /* Avoid -0.0 with downward rounding.  */
> +      if (WANT_ROUNDING && y == 0.0)
> +       y = 0.0;
> +      /* The underflow exception needs to be signaled explicitly.  */
> +      math_force_eval (math_opt_barrier (0x1p-1022) * 0x1p-1022);
> +    }
> +  y = 0x1p-1022 * y;
> +  return y;
> +}
> +
> +/* Top 12 bits of a double (sign and exponent bits).  */
> +static inline uint32_t top12(double x)
> +{
> +       return asuint64(x) >> 52;
> +}
> +
> +vector double
> +_ZGVbN2v_exp (vector double x)
> +{
> +       v64u abstop, is_special_case, is_special_case2, idx, top, sbits;
> +       vector double kd, z, r, r2, scale, tail, tmp;
> +       u t, t2;
> +       u res;
> +       u xu;
> +       xu.d = x;
> +       v64u zero = {0, 0};
> +       u c512;
> +       vector double load = {512.0, 512.0};
> +       c512.d = load;
> +       u normalize;
> +       vector double load2 = {0x1p-54, 0x1p-54};
> +       normalize.d = load2;
> +       c512.l &= 0x7ff0000000000000;
> +       normalize.l &= 0x7ff0000000000000;
> +       abstop = xu.l & 0x7ff0000000000000;
> +       is_special_case = (v64u) vec_cmpge (xu.l - normalize.l, c512.l - normalize.l);
> +       if (__glibc_unlikely (!vec_all_eq (is_special_case, zero)))
> +       {
> +               for (int m=0;m<2;++m)
> +               {
> +                       if (!is_special_case[m])
> +                               continue;
> +                       double v;
> +                       uint32_t abstops = abstop[m] >> 52;
> +                       if (!is_special_case[m])
> +                               continue;
> +                       v = x[m];
> +                       if (abstops - top12(0x1p-54) >= 0x80000000)
> +                               /* Avoid spurious underflow for tiny x.  */
> +                               /* Note: 0 is common input.  */
> +                               res.d[m] = WANT_ROUNDING ? 1.0 + v : 1.0;
> +                       if (abstops >= top12(1024.0)) {
> +                               if (asuint64(v) == asuint64(-INFINITY))
> +                                       res.d[m] = 0.0;
> +                               else if (abstops >= top12(INFINITY))
> +                                       res.d[m] = 1.0 + v;
> +                               else if (asuint64(v) >> 63)
> +                                       res.d[m] = __math_uflow(0);
> +                               else
> +                                       res.d[m] = __math_oflow(0);
> +                               /* prevent is_special_case2 from matching */
> +                               abstop[m] = 1;
> +                       } else {
> +                               /* Large x is special cased below.  */
> +                               abstop[m] = 0;
> +                               is_special_case[m] = 0;
> +                       }
> +               }
> +       }
> +       /* exp(x) = 2^(k/N) * exp(r), with exp(r) in [2^(-1/2N),2^(1/2N)].  */
> +       /* x = ln2/N*k + r, with int k and r in [-ln2/2N, ln2/2N].  */
> +       z = InvLn2N * x;
> +       u kdu;
> +       /* z - kd is in [-1, 1] in non-nearest rounding modes.  */
> +       kd = z + Shift;
> +       kdu.d = kd;
> +       kd -= Shift;
> +       r = x + kd * NegLn2hiN + kd * NegLn2loN;
> +       /* 2^(k/N) ~= scale * (1 + tail).  */
> +       idx = 2 * (kdu.l % N);
> +       top = kdu.l << (52 - EXP_TABLE_BITS);
> +       v64u load3 = {T[idx[0]], T[idx[1]]};
> +       t.l = load3;
> +       v64u load4 = {T[idx[0] + 1], T[idx[1] + 1]};
> +       t2.l = load4;
> +       tail = t.d;
> +       /* This is only a valid scale when -1023*N < k < 1024*N.  */
> +       sbits = t2.l + top;
> +       /* exp(x) = 2^(k/N) * exp(r) ~= scale + scale * (tail + exp(r) - 1).  */
> +       /* Evaluation is optimized assuming superscalar pipelined execution.  */
> +       r2 = r * r;
> +       /* Without fma the worst case error is 0.25/N ulp larger.  */
> +       /* Worst case error is less than 0.5+1.11/N+(abs poly error * 2^53) ulp.  */
> +       tmp = tail + r + r2 * (C2 + r * C3) + r2 * r2 * (C4 + r * C5);
> +       is_special_case2 = (v64u) vec_cmpeq (abstop, zero);
> +       if (__glibc_unlikely (!vec_all_eq (is_special_case2, zero)))
> +       {
> +               u sc2;
> +               for (int m=0;m<2;++m)
> +               {
> +                       sc2.d[m] = specialcase(tmp[m], sbits[m], kdu.l[m]);
> +               }
> +               res.l = vec_sel (res.l, sc2.l, is_special_case2);
> +       }
> +       u sbitsu;
> +       sbitsu.l = sbits;
> +       scale = sbitsu.d;
> +       u res2;
> +       res2.d = scale + scale * tmp;
> +       /* Note: tmp == 0 or |tmp| > 2^-200 and scale > 2^-739, so there
> +          is no spurious underflow here even without fma.  */
> +       res.l = vec_sel (res.l, res2.l, ~is_special_case & ~is_special_case2);
> +       return res.d;
> +}
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
> new file mode 100644
> index 0000000000..208b897d04
> --- /dev/null
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
> @@ -0,0 +1,202 @@
> +/* Shared data between vector exp, exp2 and pow
> +   Copyright (C) 2019 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +/* Based on sysdeps/ieee754/dbl-64/e_exp.c which came from
> +   Szabolcs Nagy at ARM Ltd. */
> +
> +#include "math_config_dbl.h"
> +
> +#define N (1 << EXP_TABLE_BITS)
> +
> +const struct exp_data __exp_data = {
> +// N/ln2
> +.invln2N = {
> +  0x1.71547652b82fep0 * N,
> +  0x1.71547652b82fep0 * N,
> +},
> +// -ln2/N
> +.negln2hiN = {
> +  -0x1.62e42fefa0000p-8,
> +  -0x1.62e42fefa0000p-8,
> +},
> +.negln2loN = {
> +  -0x1.cf79abc9e3b3ap-47,
> +  -0x1.cf79abc9e3b3ap-47,
> +},
> +.shift = {
> +  0x1.8p52,
> +  0x1.8p52,
> +},
> +// exp polynomial coefficients.
> +.poly = {
> +// abs error: 1.555*2^-66
> +// ulp error: 0.509 (0.511 without fma)
> +// if |x| < ln2/256+eps
> +// abs error if |x| < ln2/256+0x1p-15: 1.09*2^-65
> +// abs error if |x| < ln2/128: 1.7145*2^-56
> +{0x1.ffffffffffdbdp-2, 0x1.ffffffffffdbdp-2},
> +{0x1.555555555543cp-3, 0x1.555555555543cp-3},
> +{0x1.55555cf172b91p-5, 0x1.55555cf172b91p-5},
> +{0x1.1111167a4d017p-7, 0x1.1111167a4d017p-7},
> +},
> +.exp2_shift = {
> +  0x1.8p52 / N,
> +  0x1.8p52 / N,
> +},
> +// exp2 polynomial coefficients.
> +.exp2_poly = {
> +// abs error: 1.2195*2^-65
> +// ulp error: 0.507 (0.511 without fma)
> +// if |x| < 1/256
> +// abs error if |x| < 1/128: 1.9941*2^-56
> +{0x1.62e42fefa39efp-1, 0x1.62e42fefa39efp-1},
> +{0x1.ebfbdff82c424p-3, 0x1.ebfbdff82c424p-3},
> +{0x1.c6b08d70cf4b5p-5, 0x1.c6b08d70cf4b5p-5},
> +{0x1.3b2abd24650ccp-7, 0x1.3b2abd24650ccp-7},
> +{0x1.5d7e09b4e3a84p-10, 0x1.5d7e09b4e3a84p-10},
> +},
> +// 2^(k/N) ~= H[k]*(1 + T[k]) for int k in [0,N)
> +// tab[2*k] = asuint64(T[k])
> +// tab[2*k+1] = asuint64(H[k]) - (k << 52)/N
> +.tab = {
> +0x0, 0x3ff0000000000000,
> +0x3c9b3b4f1a88bf6e, 0x3feff63da9fb3335,
> +0xbc7160139cd8dc5d, 0x3fefec9a3e778061,
> +0xbc905e7a108766d1, 0x3fefe315e86e7f85,
> +0x3c8cd2523567f613, 0x3fefd9b0d3158574,
> +0xbc8bce8023f98efa, 0x3fefd06b29ddf6de,
> +0x3c60f74e61e6c861, 0x3fefc74518759bc8,
> +0x3c90a3e45b33d399, 0x3fefbe3ecac6f383,
> +0x3c979aa65d837b6d, 0x3fefb5586cf9890f,
> +0x3c8eb51a92fdeffc, 0x3fefac922b7247f7,
> +0x3c3ebe3d702f9cd1, 0x3fefa3ec32d3d1a2,
> +0xbc6a033489906e0b, 0x3fef9b66affed31b,
> +0xbc9556522a2fbd0e, 0x3fef9301d0125b51,
> +0xbc5080ef8c4eea55, 0x3fef8abdc06c31cc,
> +0xbc91c923b9d5f416, 0x3fef829aaea92de0,
> +0x3c80d3e3e95c55af, 0x3fef7a98c8a58e51,
> +0xbc801b15eaa59348, 0x3fef72b83c7d517b,
> +0xbc8f1ff055de323d, 0x3fef6af9388c8dea,
> +0x3c8b898c3f1353bf, 0x3fef635beb6fcb75,
> +0xbc96d99c7611eb26, 0x3fef5be084045cd4,
> +0x3c9aecf73e3a2f60, 0x3fef54873168b9aa,
> +0xbc8fe782cb86389d, 0x3fef4d5022fcd91d,
> +0x3c8a6f4144a6c38d, 0x3fef463b88628cd6,
> +0x3c807a05b0e4047d, 0x3fef3f49917ddc96,
> +0x3c968efde3a8a894, 0x3fef387a6e756238,
> +0x3c875e18f274487d, 0x3fef31ce4fb2a63f,
> +0x3c80472b981fe7f2, 0x3fef2b4565e27cdd,
> +0xbc96b87b3f71085e, 0x3fef24dfe1f56381,
> +0x3c82f7e16d09ab31, 0x3fef1e9df51fdee1,
> +0xbc3d219b1a6fbffa, 0x3fef187fd0dad990,
> +0x3c8b3782720c0ab4, 0x3fef1285a6e4030b,
> +0x3c6e149289cecb8f, 0x3fef0cafa93e2f56,
> +0x3c834d754db0abb6, 0x3fef06fe0a31b715,
> +0x3c864201e2ac744c, 0x3fef0170fc4cd831,
> +0x3c8fdd395dd3f84a, 0x3feefc08b26416ff,
> +0xbc86a3803b8e5b04, 0x3feef6c55f929ff1,
> +0xbc924aedcc4b5068, 0x3feef1a7373aa9cb,
> +0xbc9907f81b512d8e, 0x3feeecae6d05d866,
> +0xbc71d1e83e9436d2, 0x3feee7db34e59ff7,
> +0xbc991919b3ce1b15, 0x3feee32dc313a8e5,
> +0x3c859f48a72a4c6d, 0x3feedea64c123422,
> +0xbc9312607a28698a, 0x3feeda4504ac801c,
> +0xbc58a78f4817895b, 0x3feed60a21f72e2a,
> +0xbc7c2c9b67499a1b, 0x3feed1f5d950a897,
> +0x3c4363ed60c2ac11, 0x3feece086061892d,
> +0x3c9666093b0664ef, 0x3feeca41ed1d0057,
> +0x3c6ecce1daa10379, 0x3feec6a2b5c13cd0,
> +0x3c93ff8e3f0f1230, 0x3feec32af0d7d3de,
> +0x3c7690cebb7aafb0, 0x3feebfdad5362a27,
> +0x3c931dbdeb54e077, 0x3feebcb299fddd0d,
> +0xbc8f94340071a38e, 0x3feeb9b2769d2ca7,
> +0xbc87deccdc93a349, 0x3feeb6daa2cf6642,
> +0xbc78dec6bd0f385f, 0x3feeb42b569d4f82,
> +0xbc861246ec7b5cf6, 0x3feeb1a4ca5d920f,
> +0x3c93350518fdd78e, 0x3feeaf4736b527da,
> +0x3c7b98b72f8a9b05, 0x3feead12d497c7fd,
> +0x3c9063e1e21c5409, 0x3feeab07dd485429,
> +0x3c34c7855019c6ea, 0x3feea9268a5946b7,
> +0x3c9432e62b64c035, 0x3feea76f15ad2148,
> +0xbc8ce44a6199769f, 0x3feea5e1b976dc09,
> +0xbc8c33c53bef4da8, 0x3feea47eb03a5585,
> +0xbc845378892be9ae, 0x3feea34634ccc320,
> +0xbc93cedd78565858, 0x3feea23882552225,
> +0x3c5710aa807e1964, 0x3feea155d44ca973,
> +0xbc93b3efbf5e2228, 0x3feea09e667f3bcd,
> +0xbc6a12ad8734b982, 0x3feea012750bdabf,
> +0xbc6367efb86da9ee, 0x3fee9fb23c651a2f,
> +0xbc80dc3d54e08851, 0x3fee9f7df9519484,
> +0xbc781f647e5a3ecf, 0x3fee9f75e8ec5f74,
> +0xbc86ee4ac08b7db0, 0x3fee9f9a48a58174,
> +0xbc8619321e55e68a, 0x3fee9feb564267c9,
> +0x3c909ccb5e09d4d3, 0x3feea0694fde5d3f,
> +0xbc7b32dcb94da51d, 0x3feea11473eb0187,
> +0x3c94ecfd5467c06b, 0x3feea1ed0130c132,
> +0x3c65ebe1abd66c55, 0x3feea2f336cf4e62,
> +0xbc88a1c52fb3cf42, 0x3feea427543e1a12,
> +0xbc9369b6f13b3734, 0x3feea589994cce13,
> +0xbc805e843a19ff1e, 0x3feea71a4623c7ad,
> +0xbc94d450d872576e, 0x3feea8d99b4492ed,
> +0x3c90ad675b0e8a00, 0x3feeaac7d98a6699,
> +0x3c8db72fc1f0eab4, 0x3feeace5422aa0db,
> +0xbc65b6609cc5e7ff, 0x3feeaf3216b5448c,
> +0x3c7bf68359f35f44, 0x3feeb1ae99157736,
> +0xbc93091fa71e3d83, 0x3feeb45b0b91ffc6,
> +0xbc5da9b88b6c1e29, 0x3feeb737b0cdc5e5,
> +0xbc6c23f97c90b959, 0x3feeba44cbc8520f,
> +0xbc92434322f4f9aa, 0x3feebd829fde4e50,
> +0xbc85ca6cd7668e4b, 0x3feec0f170ca07ba,
> +0x3c71affc2b91ce27, 0x3feec49182a3f090,
> +0x3c6dd235e10a73bb, 0x3feec86319e32323,
> +0xbc87c50422622263, 0x3feecc667b5de565,
> +0x3c8b1c86e3e231d5, 0x3feed09bec4a2d33,
> +0xbc91bbd1d3bcbb15, 0x3feed503b23e255d,
> +0x3c90cc319cee31d2, 0x3feed99e1330b358,
> +0x3c8469846e735ab3, 0x3feede6b5579fdbf,
> +0xbc82dfcd978e9db4, 0x3feee36bbfd3f37a,
> +0x3c8c1a7792cb3387, 0x3feee89f995ad3ad,
> +0xbc907b8f4ad1d9fa, 0x3feeee07298db666,
> +0xbc55c3d956dcaeba, 0x3feef3a2b84f15fb,
> +0xbc90a40e3da6f640, 0x3feef9728de5593a,
> +0xbc68d6f438ad9334, 0x3feeff76f2fb5e47,
> +0xbc91eee26b588a35, 0x3fef05b030a1064a,
> +0x3c74ffd70a5fddcd, 0x3fef0c1e904bc1d2,
> +0xbc91bdfbfa9298ac, 0x3fef12c25bd71e09,
> +0x3c736eae30af0cb3, 0x3fef199bdd85529c,
> +0x3c8ee3325c9ffd94, 0x3fef20ab5fffd07a,
> +0x3c84e08fd10959ac, 0x3fef27f12e57d14b,
> +0x3c63cdaf384e1a67, 0x3fef2f6d9406e7b5,
> +0x3c676b2c6c921968, 0x3fef3720dcef9069,
> +0xbc808a1883ccb5d2, 0x3fef3f0b555dc3fa,
> +0xbc8fad5d3ffffa6f, 0x3fef472d4a07897c,
> +0xbc900dae3875a949, 0x3fef4f87080d89f2,
> +0x3c74a385a63d07a7, 0x3fef5818dcfba487,
> +0xbc82919e2040220f, 0x3fef60e316c98398,
> +0x3c8e5a50d5c192ac, 0x3fef69e603db3285,
> +0x3c843a59ac016b4b, 0x3fef7321f301b460,
> +0xbc82d52107b43e1f, 0x3fef7c97337b9b5f,
> +0xbc892ab93b470dc9, 0x3fef864614f5a129,
> +0x3c74b604603a88d3, 0x3fef902ee78b3ff6,
> +0x3c83c5ec519d7271, 0x3fef9a51fbc74c83,
> +0xbc8ff7128fd391f0, 0x3fefa4afa2a490da,
> +0xbc8dae98e223747d, 0x3fefaf482d8e67f1,
> +0x3c8ec3bc41aa2008, 0x3fefba1bee615a27,
> +0x3c842b94c3a9eb32, 0x3fefc52b376bba97,
> +0x3c8a64a931d185ee, 0x3fefd0765b6e4540,
> +0xbc8e37bae43be3ed, 0x3fefdbfdad9cbe14,
> +0x3c77893b4d91cd9d, 0x3fefe7c1819e90d8,
> +0x3c5305c14160cc89, 0x3feff3c22b8f71f1,
> +},
> +};
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
> index d7588a7929..3a9fb05aee 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
> @@ -21,7 +21,7 @@
>  #include <math/math-svid-compat.h>
>  #include <shlib-compat.h>
>  #include <libm-alias-double.h>
> -#include "math_config.h"
> +#include "math_config_dbl.h"
>  #include <altivec.h>
>
>  #define T __log_data.tab
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
> index 2fe569576c..f1299404c4 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
> @@ -16,7 +16,7 @@
>     License along with the GNU C Library; if not, see
>     <http://www.gnu.org/licenses/>.  */
>
> -#include "math_config.h"
> +#include "math_config_dbl.h"
>
>  #define N (1 << LOG_TABLE_BITS)
>
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
> new file mode 100644
> index 0000000000..e60b0d232f
> --- /dev/null
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
> @@ -0,0 +1,40 @@
> +/* Double-precision math error handling.
> +   Copyright (C) 2017-2019 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include <fpu/math-barriers.h>
> +#include "math_config_dbl.h"
> +
> +/* NOINLINE reduces code size.  */
> +NOINLINE static double
> +xflow (uint32_t sign, double y)
> +{
> +  y = math_opt_barrier (sign ? -y : y) * y;
> +  return y;
> +}
> +
> +attribute_hidden double
> +__math_uflow (uint32_t sign)
> +{
> +  return xflow (sign, 0x1p-767);
> +}
> +
> +attribute_hidden double
> +__math_oflow (uint32_t sign)
> +{
> +  return xflow (sign, 0x1p769);
> +}
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
> index bfbd340626..46558dbd77 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
> @@ -1,4 +1,5 @@
>  GLIBC_2.30 _ZGVbN2v_cos F
> +GLIBC_2.30 _ZGVbN2v_exp F
>  GLIBC_2.30 _ZGVbN2v_log F
>  GLIBC_2.30 _ZGVbN2v_sin F
>  GLIBC_2.30 _ZGVbN2vvv_sincos F
> --
> 2.21.0.1020.gf2820cf01a
>
Florian Weimer - May 29, 2019, 7:19 p.m.
* Shawn Landden:

> On Wed, May 29, 2019 at 2:11 PM Shawn Landden <shawn@git.icu> wrote:
>>
>> Passes all tests.

> I change this but forgot to regenerate the patch. I am getting a bunch
> of seemingly unrelated test failures.

Did you rebuild everything from scratch?  Incremental builds often
result in bizarre failures. 8-(

Thanks,
Florian
Shawn Landden - June 4, 2019, 2:43 a.m.
Ping

On Wed, May 29, 2019 at 2:11 PM Shawn Landden <shawn@git.icu> wrote:
>
> Passes all tests.
>
> Unlike other libmvec functions, this sets the underflow and overflow bits.
> The caller can check these flags, and possibly re-run the calculations with
> scalar expf to figure out what is causing the overflow or underflow.
>
> The special-case path is not vectorized, and performs much worse than
> the scalar code.
> Normalized data: 1 to 2^32 converted to double
> Running 20 times over 32MiB
> vector: mean 563.807107 MiB/s (sd 0.390922)
> scalar: mean 226.527824 MiB/s (sd 0.077406)
>
> Random data:
> vector: mean 80.175986 MiB/s (sd 1.110948)
> scalar: mean 244.738130 MiB/s (sd 0.029561)
>
> v2: Fix some serious problems with the algorithm. Not
>     sure how I missed those problems.
> v3: Style problems.  Fix symbol order.
>
> 2019-05-11  Shawn Landden  <shawn@git.icu>
>
>         [BZ #24209]
>         * NEWS: Noted the addition of PPC64 vector exp function.
>         * sysdeps/powerpc/bits/math-vector.h: Added entry for vector exp.
>         * sysdeps/powerpc/powerpc64/fpu/Versions: Added vector exp entry.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile:
>         (libmvec-sysdep_routines, CFLAGS-vec_d_exp2_vsx.c):
>         (CFLAGS-vec_d_exp_data.c): Added build of VSX SIMD expf
>         function and tests. Added vec_math_err.c to build.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/(math_config.h)->(math_config_dbl.h)
>         Renamed, and modified for exp.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c:
>         Added entry for vector exp.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c: New file.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c: Likewise.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c: Likewise.
>         * sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist: SIMD expf
>         added.
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c: Rename of math_config.h
>         * sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c: Likewise
> ---
>  NEWS                                          |   1 +
>  sysdeps/powerpc/bits/math-vector.h            |   2 +
>  sysdeps/powerpc/powerpc64/fpu/Versions        |   2 +-
>  .../powerpc/powerpc64/fpu/multiarch/Makefile  |   8 +-
>  .../{math_config.h => math_config_dbl.h}      |  15 +-
>  .../multiarch/test-double-vlen2-wrappers.c    |   1 +
>  .../powerpc64/fpu/multiarch/vec_d_exp2_vsx.c  | 197 +++++++++++++++++
>  .../powerpc64/fpu/multiarch/vec_d_exp_data.c  | 202 ++++++++++++++++++
>  .../powerpc64/fpu/multiarch/vec_d_log2_vsx.c  |   2 +-
>  .../powerpc64/fpu/multiarch/vec_d_log_data.c  |   2 +-
>  .../powerpc64/fpu/multiarch/vec_math_err.c    |  40 ++++
>  .../linux/powerpc/powerpc64/libmvec.abilist   |   1 +
>  12 files changed, 461 insertions(+), 12 deletions(-)
>  rename sysdeps/powerpc/powerpc64/fpu/multiarch/{math_config.h => math_config_dbl.h} (95%)
>  create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
>  create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
>  create mode 100644 sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
>
> diff --git a/NEWS b/NEWS
> index 26f5c67f75..a33af8c316 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -20,6 +20,7 @@ Major new features:
>    - single-precision sine: sinf
>    - double-precision sincos: sincos
>    - single-precision sincos: sincosf
> +  - double-precision exp: exp
>    - single-precision exp: expf
>
>    GCC support for auto-vectorization of functions on PPC64 is not yet
> diff --git a/sysdeps/powerpc/bits/math-vector.h b/sysdeps/powerpc/bits/math-vector.h
> index bbc9db0dd9..e7846b4bfa 100644
> --- a/sysdeps/powerpc/bits/math-vector.h
> +++ b/sysdeps/powerpc/bits/math-vector.h
> @@ -46,6 +46,8 @@
>  #  define __DECL_SIMD_sincosf __DECL_SIMD_PPC64
>  #  undef __DECL_SIMD_expf
>  #  define __DECL_SIMD_expf __DECL_SIMD_PPC64
> +#  undef __DECL_SIMD_exp
> +#  define __DECL_SIMD_exp __DECL_SIMD_PPC64
>
>  # endif
>  #endif
> diff --git a/sysdeps/powerpc/powerpc64/fpu/Versions b/sysdeps/powerpc/powerpc64/fpu/Versions
> index 7c45e76074..361edee9e7 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/Versions
> +++ b/sysdeps/powerpc/powerpc64/fpu/Versions
> @@ -2,6 +2,6 @@ libmvec {
>    GLIBC_2.30 {
>      _ZGVbN2v_cos; _ZGVbN4v_cosf; _ZGVbN2v_sin; _ZGVbN4v_sinf;
>      _ZGVbN2v_log; _ZGVbN4v_logf; _ZGVbN2vvv_sincos; _ZGVbN4vvv_sincosf;
> -    _ZGVbN4v_expf;
> +    _ZGVbN4v_expf; _ZGVbN2v_exp;
>    }
>  }
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
> index d15183d5ee..dd982bb068 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
> @@ -49,7 +49,8 @@ libmvec-sysdep_routines += vec_d_cos2_vsx vec_s_cosf4_vsx \
>                            vec_d_log2_vsx vec_d_log_data \
>                            vec_s_logf4_vsx vec_s_logf_data \
>                            vec_s_expf4_vsx vec_s_exp2f_data \
> -                          vec_math_errf \
> +                          vec_math_errf vec_math_err \
> +                          vec_d_exp2_vsx vec_d_exp_data \
>                            vec_d_sincos2_vsx vec_s_sincosf4_vsx
>  CFLAGS-vec_d_cos2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
>  CFLAGS-vec_d_log2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
> @@ -64,6 +65,9 @@ CFLAGS-vec_d_sincos2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
>  CFLAGS-vec_s_sincosf4_vsx.c += -mabi=altivec -maltivec -mvsx
>  CFLAGS-vec_s_expf4_vsx.c += -mabi=altivec -maltivec -mvsx
>  CFLAGS-vec_s_exp2f_data.c += -mabi=altivec -maltivec -mvsx
> +CFLAGS-vec_d_exp2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
> +CFLAGS-vec_d_exp_data.c += -mabi=altivec -maltivec -mvsx
> +CFLAGS-vec_math_err.c += -mabi=altivec -maltivec -mvsx
>  endif
>
>  # Variables for libmvec tests.
> @@ -71,7 +75,7 @@ ifeq ($(subdir),math)
>  ifeq ($(build-mathvec),yes)
>  libmvec-tests += double-vlen2 float-vlen4
>
> -double-vlen2-funcs = cos sin sincos log
> +double-vlen2-funcs = cos sin sincos log exp
>  float-vlen4-funcs = cos sin sincos log exp
>
>  double-vlen2-arch-ext-cflags = -mabi=altivec -maltivec -mvsx -DREQUIRE_VSX
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h b/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
> similarity index 95%
> rename from sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h
> rename to sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
> index bd37906ecb..7c94f5b9b2 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
> @@ -24,6 +24,7 @@
>  #include <nan-high-order-bit.h>
>  #include <stdint.h>
>  #include <altivec.h>
> +#include <math-narrow-eval.h>
>
>  #ifndef WANT_ROUNDING
>  /* Correct special case results in non-nearest rounding modes.  */
> @@ -134,13 +135,13 @@ check_uflow (double x)
>  #define EXP2_POLY_ORDER 5
>  extern const struct exp_data
>  {
> -  double invln2N;
> -  double shift;
> -  double negln2hiN;
> -  double negln2loN;
> -  double poly[4]; /* Last four coefficients.  */
> -  double exp2_shift;
> -  double exp2_poly[EXP2_POLY_ORDER];
> +  vector double invln2N;
> +  vector double shift;
> +  vector double negln2hiN;
> +  vector double negln2loN;
> +  vector double poly[4]; /* Last four coefficients.  */
> +  vector double exp2_shift;
> +  vector double exp2_poly[EXP2_POLY_ORDER];
>    uint64_t tab[2*(1 << EXP_TABLE_BITS)];
>  } __exp_data attribute_hidden;
>
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
> index c9e2dbfdd0..f368e47947 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
> @@ -24,4 +24,5 @@
>  VECTOR_WRAPPER (WRAPPER_NAME (cos), _ZGVbN2v_cos)
>  VECTOR_WRAPPER (WRAPPER_NAME (sin), _ZGVbN2v_sin)
>  VECTOR_WRAPPER (WRAPPER_NAME (log), _ZGVbN2v_log)
> +VECTOR_WRAPPER (WRAPPER_NAME (exp), _ZGVbN2v_exp)
>  VECTOR_WRAPPER_fFF (WRAPPER_NAME (sincos), _ZGVbN2vvv_sincos)
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
> new file mode 100644
> index 0000000000..376531e32b
> --- /dev/null
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
> @@ -0,0 +1,197 @@
> +/* Double-precision vector exp(x) function.
> +   Copyright (C) 2019 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +/* Based on sysdeps/ieee754/dbl-64/e_exp.c which came from
> +   Szabolcs Nagy at ARM Ltd. */
> +#include <altivec.h>
> +#include <math.h>
> +#include <math-barriers.h>
> +#include <math-narrow-eval.h>
> +
> +#include "math_config_dbl.h"
> +
> +typedef vector long long unsigned v64u;
> +typedef union {
> +  vector unsigned u;
> +  vector float f;
> +  v64u l;
> +  vector double d;
> +} u;
> +typedef union {
> +  double d;
> +  uint64_t l;
> +  unsigned u;
> +  float f;
> +} us;
> +
> +#define N (1 << EXP_TABLE_BITS)
> +#define InvLn2N __exp_data.invln2N
> +#define NegLn2hiN __exp_data.negln2hiN
> +#define NegLn2loN __exp_data.negln2loN
> +#define Shift __exp_data.shift
> +#define T __exp_data.tab
> +#define C2 __exp_data.poly[5 - EXP_POLY_ORDER]
> +#define C3 __exp_data.poly[6 - EXP_POLY_ORDER]
> +#define C4 __exp_data.poly[7 - EXP_POLY_ORDER]
> +#define C5 __exp_data.poly[8 - EXP_POLY_ORDER]
> +
> +/* Handle cases that may overflow or underflow when computing the result that
> +   is scale*(1+TMP) without intermediate rounding.  The bit representation of
> +   scale is in SBITS, however it has a computed exponent that may have
> +   overflown into the sign bit so that needs to be adjusted before using it as
> +   a double.  (int32_t)KI is the k used in the argument reduction and exponent
> +   adjustment of scale, positive k here means the result may overflow and
> +   negative k means the result may underflow.  */
> +static inline double
> +specialcase (double_t tmp, uint64_t sbits, uint64_t ki)
> +{
> +  double_t scale, y;
> +
> +  if ((ki & 0x80000000) == 0)
> +    {
> +      /* k > 0, the exponent of scale might have overflowed by <= 460.  */
> +      sbits -= 1009ull << 52;
> +      scale = asdouble (sbits);
> +      y = 0x1p1009 * (scale + scale * tmp);
> +      return y;
> +    }
> +  /* k < 0, need special care in the subnormal range.  */
> +  sbits += 1022ull << 52;
> +  scale = asdouble (sbits);
> +  y = scale + scale * tmp;
> +  if (y < 1.0)
> +    {
> +      /* Round y to the right precision before scaling it into the subnormal
> +        range to avoid double rounding that can cause 0.5+E/2 ulp error where
> +        E is the worst-case ulp error outside the subnormal range.  So this
> +        is only useful if the goal is better than 1 ulp worst-case error.  */
> +      double_t hi, lo;
> +      lo = scale - y + scale * tmp;
> +      hi = 1.0 + y;
> +      lo = 1.0 - hi + y + lo;
> +      y = math_narrow_eval (hi + lo) - 1.0;
> +      /* Avoid -0.0 with downward rounding.  */
> +      if (WANT_ROUNDING && y == 0.0)
> +       y = 0.0;
> +      /* The underflow exception needs to be signaled explicitly.  */
> +      math_force_eval (math_opt_barrier (0x1p-1022) * 0x1p-1022);
> +    }
> +  y = 0x1p-1022 * y;
> +  return y;
> +}
> +
> +/* Top 12 bits of a double (sign and exponent bits).  */
> +static inline uint32_t top12(double x)
> +{
> +       return asuint64(x) >> 52;
> +}
> +
> +vector double
> +_ZGVbN2v_exp (vector double x)
> +{
> +       v64u abstop, is_special_case, is_special_case2, idx, top, sbits;
> +       vector double kd, z, r, r2, scale, tail, tmp;
> +       u t, t2;
> +       u res;
> +       u xu;
> +       xu.d = x;
> +       v64u zero = {0, 0};
> +       u c512;
> +       vector double load = {512.0, 512.0};
> +       c512.d = load;
> +       u normalize;
> +       vector double load2 = {0x1p-54, 0x1p-54};
> +       normalize.d = load2;
> +       c512.l &= 0x7ff0000000000000;
> +       normalize.l &= 0x7ff0000000000000;
> +       abstop = xu.l & 0x7ff0000000000000;
> +       is_special_case = (v64u) vec_cmpge (xu.l - normalize.l, c512.l - normalize.l);
> +       if (__glibc_unlikely (!vec_all_eq (is_special_case, zero)))
> +       {
> +               for (int m=0;m<2;++m)
> +               {
> +                       if (!is_special_case[m])
> +                               continue;
> +                       double v;
> +                       uint32_t abstops = abstop[m] >> 52;
> +                       if (!is_special_case[m])
> +                               continue;
> +                       v = x[m];
> +                       if (abstops - top12(0x1p-54) >= 0x80000000)
> +                               /* Avoid spurious underflow for tiny x.  */
> +                               /* Note: 0 is common input.  */
> +                               res.d[m] = WANT_ROUNDING ? 1.0 + v : 1.0;
> +                       if (abstops >= top12(1024.0)) {
> +                               if (asuint64(v) == asuint64(-INFINITY))
> +                                       res.d[m] = 0.0;
> +                               else if (abstops >= top12(INFINITY))
> +                                       res.d[m] = 1.0 + v;
> +                               else if (asuint64(v) >> 63)
> +                                       res.d[m] = __math_uflow(0);
> +                               else
> +                                       res.d[m] = __math_oflow(0);
> +                               /* prevent is_special_case2 from matching */
> +                               abstop[m] = 1;
> +                       } else {
> +                               /* Large x is special cased below.  */
> +                               abstop[m] = 0;
> +                               is_special_case[m] = 0;
> +                       }
> +               }
> +       }
> +       /* exp(x) = 2^(k/N) * exp(r), with exp(r) in [2^(-1/2N),2^(1/2N)].  */
> +       /* x = ln2/N*k + r, with int k and r in [-ln2/2N, ln2/2N].  */
> +       z = InvLn2N * x;
> +       u kdu;
> +       /* z - kd is in [-1, 1] in non-nearest rounding modes.  */
> +       kd = z + Shift;
> +       kdu.d = kd;
> +       kd -= Shift;
> +       r = x + kd * NegLn2hiN + kd * NegLn2loN;
> +       /* 2^(k/N) ~= scale * (1 + tail).  */
> +       idx = 2 * (kdu.l % N);
> +       top = kdu.l << (52 - EXP_TABLE_BITS);
> +       v64u load3 = {T[idx[0]], T[idx[1]]};
> +       t.l = load3;
> +       v64u load4 = {T[idx[0] + 1], T[idx[1] + 1]};
> +       t2.l = load4;
> +       tail = t.d;
> +       /* This is only a valid scale when -1023*N < k < 1024*N.  */
> +       sbits = t2.l + top;
> +       /* exp(x) = 2^(k/N) * exp(r) ~= scale + scale * (tail + exp(r) - 1).  */
> +       /* Evaluation is optimized assuming superscalar pipelined execution.  */
> +       r2 = r * r;
> +       /* Without fma the worst case error is 0.25/N ulp larger.  */
> +       /* Worst case error is less than 0.5+1.11/N+(abs poly error * 2^53) ulp.  */
> +       tmp = tail + r + r2 * (C2 + r * C3) + r2 * r2 * (C4 + r * C5);
> +       is_special_case2 = (v64u) vec_cmpeq (abstop, zero);
> +       if (__glibc_unlikely (!vec_all_eq (is_special_case2, zero)))
> +       {
> +               u sc2;
> +               for (int m=0;m<2;++m)
> +               {
> +                       sc2.d[m] = specialcase(tmp[m], sbits[m], kdu.l[m]);
> +               }
> +               res.l = vec_sel (res.l, sc2.l, is_special_case2);
> +       }
> +       u sbitsu;
> +       sbitsu.l = sbits;
> +       scale = sbitsu.d;
> +       u res2;
> +       res2.d = scale + scale * tmp;
> +       /* Note: tmp == 0 or |tmp| > 2^-200 and scale > 2^-739, so there
> +          is no spurious underflow here even without fma.  */
> +       res.l = vec_sel (res.l, res2.l, ~is_special_case & ~is_special_case2);
> +       return res.d;
> +}
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
> new file mode 100644
> index 0000000000..208b897d04
> --- /dev/null
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
> @@ -0,0 +1,202 @@
> +/* Shared data between vector exp, exp2 and pow
> +   Copyright (C) 2019 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +/* Based on sysdeps/ieee754/dbl-64/e_exp.c which came from
> +   Szabolcs Nagy at ARM Ltd. */
> +
> +#include "math_config_dbl.h"
> +
> +#define N (1 << EXP_TABLE_BITS)
> +
> +const struct exp_data __exp_data = {
> +// N/ln2
> +.invln2N = {
> +  0x1.71547652b82fep0 * N,
> +  0x1.71547652b82fep0 * N,
> +},
> +// -ln2/N
> +.negln2hiN = {
> +  -0x1.62e42fefa0000p-8,
> +  -0x1.62e42fefa0000p-8,
> +},
> +.negln2loN = {
> +  -0x1.cf79abc9e3b3ap-47,
> +  -0x1.cf79abc9e3b3ap-47,
> +},
> +.shift = {
> +  0x1.8p52,
> +  0x1.8p52,
> +},
> +// exp polynomial coefficients.
> +.poly = {
> +// abs error: 1.555*2^-66
> +// ulp error: 0.509 (0.511 without fma)
> +// if |x| < ln2/256+eps
> +// abs error if |x| < ln2/256+0x1p-15: 1.09*2^-65
> +// abs error if |x| < ln2/128: 1.7145*2^-56
> +{0x1.ffffffffffdbdp-2, 0x1.ffffffffffdbdp-2},
> +{0x1.555555555543cp-3, 0x1.555555555543cp-3},
> +{0x1.55555cf172b91p-5, 0x1.55555cf172b91p-5},
> +{0x1.1111167a4d017p-7, 0x1.1111167a4d017p-7},
> +},
> +.exp2_shift = {
> +  0x1.8p52 / N,
> +  0x1.8p52 / N,
> +},
> +// exp2 polynomial coefficients.
> +.exp2_poly = {
> +// abs error: 1.2195*2^-65
> +// ulp error: 0.507 (0.511 without fma)
> +// if |x| < 1/256
> +// abs error if |x| < 1/128: 1.9941*2^-56
> +{0x1.62e42fefa39efp-1, 0x1.62e42fefa39efp-1},
> +{0x1.ebfbdff82c424p-3, 0x1.ebfbdff82c424p-3},
> +{0x1.c6b08d70cf4b5p-5, 0x1.c6b08d70cf4b5p-5},
> +{0x1.3b2abd24650ccp-7, 0x1.3b2abd24650ccp-7},
> +{0x1.5d7e09b4e3a84p-10, 0x1.5d7e09b4e3a84p-10},
> +},
> +// 2^(k/N) ~= H[k]*(1 + T[k]) for int k in [0,N)
> +// tab[2*k] = asuint64(T[k])
> +// tab[2*k+1] = asuint64(H[k]) - (k << 52)/N
> +.tab = {
> +0x0, 0x3ff0000000000000,
> +0x3c9b3b4f1a88bf6e, 0x3feff63da9fb3335,
> +0xbc7160139cd8dc5d, 0x3fefec9a3e778061,
> +0xbc905e7a108766d1, 0x3fefe315e86e7f85,
> +0x3c8cd2523567f613, 0x3fefd9b0d3158574,
> +0xbc8bce8023f98efa, 0x3fefd06b29ddf6de,
> +0x3c60f74e61e6c861, 0x3fefc74518759bc8,
> +0x3c90a3e45b33d399, 0x3fefbe3ecac6f383,
> +0x3c979aa65d837b6d, 0x3fefb5586cf9890f,
> +0x3c8eb51a92fdeffc, 0x3fefac922b7247f7,
> +0x3c3ebe3d702f9cd1, 0x3fefa3ec32d3d1a2,
> +0xbc6a033489906e0b, 0x3fef9b66affed31b,
> +0xbc9556522a2fbd0e, 0x3fef9301d0125b51,
> +0xbc5080ef8c4eea55, 0x3fef8abdc06c31cc,
> +0xbc91c923b9d5f416, 0x3fef829aaea92de0,
> +0x3c80d3e3e95c55af, 0x3fef7a98c8a58e51,
> +0xbc801b15eaa59348, 0x3fef72b83c7d517b,
> +0xbc8f1ff055de323d, 0x3fef6af9388c8dea,
> +0x3c8b898c3f1353bf, 0x3fef635beb6fcb75,
> +0xbc96d99c7611eb26, 0x3fef5be084045cd4,
> +0x3c9aecf73e3a2f60, 0x3fef54873168b9aa,
> +0xbc8fe782cb86389d, 0x3fef4d5022fcd91d,
> +0x3c8a6f4144a6c38d, 0x3fef463b88628cd6,
> +0x3c807a05b0e4047d, 0x3fef3f49917ddc96,
> +0x3c968efde3a8a894, 0x3fef387a6e756238,
> +0x3c875e18f274487d, 0x3fef31ce4fb2a63f,
> +0x3c80472b981fe7f2, 0x3fef2b4565e27cdd,
> +0xbc96b87b3f71085e, 0x3fef24dfe1f56381,
> +0x3c82f7e16d09ab31, 0x3fef1e9df51fdee1,
> +0xbc3d219b1a6fbffa, 0x3fef187fd0dad990,
> +0x3c8b3782720c0ab4, 0x3fef1285a6e4030b,
> +0x3c6e149289cecb8f, 0x3fef0cafa93e2f56,
> +0x3c834d754db0abb6, 0x3fef06fe0a31b715,
> +0x3c864201e2ac744c, 0x3fef0170fc4cd831,
> +0x3c8fdd395dd3f84a, 0x3feefc08b26416ff,
> +0xbc86a3803b8e5b04, 0x3feef6c55f929ff1,
> +0xbc924aedcc4b5068, 0x3feef1a7373aa9cb,
> +0xbc9907f81b512d8e, 0x3feeecae6d05d866,
> +0xbc71d1e83e9436d2, 0x3feee7db34e59ff7,
> +0xbc991919b3ce1b15, 0x3feee32dc313a8e5,
> +0x3c859f48a72a4c6d, 0x3feedea64c123422,
> +0xbc9312607a28698a, 0x3feeda4504ac801c,
> +0xbc58a78f4817895b, 0x3feed60a21f72e2a,
> +0xbc7c2c9b67499a1b, 0x3feed1f5d950a897,
> +0x3c4363ed60c2ac11, 0x3feece086061892d,
> +0x3c9666093b0664ef, 0x3feeca41ed1d0057,
> +0x3c6ecce1daa10379, 0x3feec6a2b5c13cd0,
> +0x3c93ff8e3f0f1230, 0x3feec32af0d7d3de,
> +0x3c7690cebb7aafb0, 0x3feebfdad5362a27,
> +0x3c931dbdeb54e077, 0x3feebcb299fddd0d,
> +0xbc8f94340071a38e, 0x3feeb9b2769d2ca7,
> +0xbc87deccdc93a349, 0x3feeb6daa2cf6642,
> +0xbc78dec6bd0f385f, 0x3feeb42b569d4f82,
> +0xbc861246ec7b5cf6, 0x3feeb1a4ca5d920f,
> +0x3c93350518fdd78e, 0x3feeaf4736b527da,
> +0x3c7b98b72f8a9b05, 0x3feead12d497c7fd,
> +0x3c9063e1e21c5409, 0x3feeab07dd485429,
> +0x3c34c7855019c6ea, 0x3feea9268a5946b7,
> +0x3c9432e62b64c035, 0x3feea76f15ad2148,
> +0xbc8ce44a6199769f, 0x3feea5e1b976dc09,
> +0xbc8c33c53bef4da8, 0x3feea47eb03a5585,
> +0xbc845378892be9ae, 0x3feea34634ccc320,
> +0xbc93cedd78565858, 0x3feea23882552225,
> +0x3c5710aa807e1964, 0x3feea155d44ca973,
> +0xbc93b3efbf5e2228, 0x3feea09e667f3bcd,
> +0xbc6a12ad8734b982, 0x3feea012750bdabf,
> +0xbc6367efb86da9ee, 0x3fee9fb23c651a2f,
> +0xbc80dc3d54e08851, 0x3fee9f7df9519484,
> +0xbc781f647e5a3ecf, 0x3fee9f75e8ec5f74,
> +0xbc86ee4ac08b7db0, 0x3fee9f9a48a58174,
> +0xbc8619321e55e68a, 0x3fee9feb564267c9,
> +0x3c909ccb5e09d4d3, 0x3feea0694fde5d3f,
> +0xbc7b32dcb94da51d, 0x3feea11473eb0187,
> +0x3c94ecfd5467c06b, 0x3feea1ed0130c132,
> +0x3c65ebe1abd66c55, 0x3feea2f336cf4e62,
> +0xbc88a1c52fb3cf42, 0x3feea427543e1a12,
> +0xbc9369b6f13b3734, 0x3feea589994cce13,
> +0xbc805e843a19ff1e, 0x3feea71a4623c7ad,
> +0xbc94d450d872576e, 0x3feea8d99b4492ed,
> +0x3c90ad675b0e8a00, 0x3feeaac7d98a6699,
> +0x3c8db72fc1f0eab4, 0x3feeace5422aa0db,
> +0xbc65b6609cc5e7ff, 0x3feeaf3216b5448c,
> +0x3c7bf68359f35f44, 0x3feeb1ae99157736,
> +0xbc93091fa71e3d83, 0x3feeb45b0b91ffc6,
> +0xbc5da9b88b6c1e29, 0x3feeb737b0cdc5e5,
> +0xbc6c23f97c90b959, 0x3feeba44cbc8520f,
> +0xbc92434322f4f9aa, 0x3feebd829fde4e50,
> +0xbc85ca6cd7668e4b, 0x3feec0f170ca07ba,
> +0x3c71affc2b91ce27, 0x3feec49182a3f090,
> +0x3c6dd235e10a73bb, 0x3feec86319e32323,
> +0xbc87c50422622263, 0x3feecc667b5de565,
> +0x3c8b1c86e3e231d5, 0x3feed09bec4a2d33,
> +0xbc91bbd1d3bcbb15, 0x3feed503b23e255d,
> +0x3c90cc319cee31d2, 0x3feed99e1330b358,
> +0x3c8469846e735ab3, 0x3feede6b5579fdbf,
> +0xbc82dfcd978e9db4, 0x3feee36bbfd3f37a,
> +0x3c8c1a7792cb3387, 0x3feee89f995ad3ad,
> +0xbc907b8f4ad1d9fa, 0x3feeee07298db666,
> +0xbc55c3d956dcaeba, 0x3feef3a2b84f15fb,
> +0xbc90a40e3da6f640, 0x3feef9728de5593a,
> +0xbc68d6f438ad9334, 0x3feeff76f2fb5e47,
> +0xbc91eee26b588a35, 0x3fef05b030a1064a,
> +0x3c74ffd70a5fddcd, 0x3fef0c1e904bc1d2,
> +0xbc91bdfbfa9298ac, 0x3fef12c25bd71e09,
> +0x3c736eae30af0cb3, 0x3fef199bdd85529c,
> +0x3c8ee3325c9ffd94, 0x3fef20ab5fffd07a,
> +0x3c84e08fd10959ac, 0x3fef27f12e57d14b,
> +0x3c63cdaf384e1a67, 0x3fef2f6d9406e7b5,
> +0x3c676b2c6c921968, 0x3fef3720dcef9069,
> +0xbc808a1883ccb5d2, 0x3fef3f0b555dc3fa,
> +0xbc8fad5d3ffffa6f, 0x3fef472d4a07897c,
> +0xbc900dae3875a949, 0x3fef4f87080d89f2,
> +0x3c74a385a63d07a7, 0x3fef5818dcfba487,
> +0xbc82919e2040220f, 0x3fef60e316c98398,
> +0x3c8e5a50d5c192ac, 0x3fef69e603db3285,
> +0x3c843a59ac016b4b, 0x3fef7321f301b460,
> +0xbc82d52107b43e1f, 0x3fef7c97337b9b5f,
> +0xbc892ab93b470dc9, 0x3fef864614f5a129,
> +0x3c74b604603a88d3, 0x3fef902ee78b3ff6,
> +0x3c83c5ec519d7271, 0x3fef9a51fbc74c83,
> +0xbc8ff7128fd391f0, 0x3fefa4afa2a490da,
> +0xbc8dae98e223747d, 0x3fefaf482d8e67f1,
> +0x3c8ec3bc41aa2008, 0x3fefba1bee615a27,
> +0x3c842b94c3a9eb32, 0x3fefc52b376bba97,
> +0x3c8a64a931d185ee, 0x3fefd0765b6e4540,
> +0xbc8e37bae43be3ed, 0x3fefdbfdad9cbe14,
> +0x3c77893b4d91cd9d, 0x3fefe7c1819e90d8,
> +0x3c5305c14160cc89, 0x3feff3c22b8f71f1,
> +},
> +};
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
> index d7588a7929..3a9fb05aee 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
> @@ -21,7 +21,7 @@
>  #include <math/math-svid-compat.h>
>  #include <shlib-compat.h>
>  #include <libm-alias-double.h>
> -#include "math_config.h"
> +#include "math_config_dbl.h"
>  #include <altivec.h>
>
>  #define T __log_data.tab
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
> index 2fe569576c..f1299404c4 100644
> --- a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
> @@ -16,7 +16,7 @@
>     License along with the GNU C Library; if not, see
>     <http://www.gnu.org/licenses/>.  */
>
> -#include "math_config.h"
> +#include "math_config_dbl.h"
>
>  #define N (1 << LOG_TABLE_BITS)
>
> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
> new file mode 100644
> index 0000000000..e60b0d232f
> --- /dev/null
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
> @@ -0,0 +1,40 @@
> +/* Double-precision math error handling.
> +   Copyright (C) 2017-2019 Free Software Foundation, Inc.
> +   This file is part of the GNU C Library.
> +
> +   The GNU C Library is free software; you can redistribute it and/or
> +   modify it under the terms of the GNU Lesser General Public
> +   License as published by the Free Software Foundation; either
> +   version 2.1 of the License, or (at your option) any later version.
> +
> +   The GNU C Library is distributed in the hope that it will be useful,
> +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> +   Lesser General Public License for more details.
> +
> +   You should have received a copy of the GNU Lesser General Public
> +   License along with the GNU C Library; if not, see
> +   <http://www.gnu.org/licenses/>.  */
> +
> +#include <fpu/math-barriers.h>
> +#include "math_config_dbl.h"
> +
> +/* NOINLINE reduces code size.  */
> +NOINLINE static double
> +xflow (uint32_t sign, double y)
> +{
> +  y = math_opt_barrier (sign ? -y : y) * y;
> +  return y;
> +}
> +
> +attribute_hidden double
> +__math_uflow (uint32_t sign)
> +{
> +  return xflow (sign, 0x1p-767);
> +}
> +
> +attribute_hidden double
> +__math_oflow (uint32_t sign)
> +{
> +  return xflow (sign, 0x1p769);
> +}
> diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
> index bfbd340626..46558dbd77 100644
> --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
> +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
> @@ -1,4 +1,5 @@
>  GLIBC_2.30 _ZGVbN2v_cos F
> +GLIBC_2.30 _ZGVbN2v_exp F
>  GLIBC_2.30 _ZGVbN2v_log F
>  GLIBC_2.30 _ZGVbN2v_sin F
>  GLIBC_2.30 _ZGVbN2vvv_sincos F
> --
> 2.21.0.1020.gf2820cf01a
>
Tulio Magno Quites Machado Filho - June 4, 2019, 8 p.m.
Shawn Landden <shawn@git.icu> writes:

> 	[BZ #24209]
> 	* NEWS: Noted the addition of PPC64 vector exp function.
> 	* sysdeps/powerpc/bits/math-vector.h: Added entry for vector exp.
> 	* sysdeps/powerpc/powerpc64/fpu/Versions: Added vector exp entry.
> 	* sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile:
> 	(libmvec-sysdep_routines, CFLAGS-vec_d_exp2_vsx.c):
> 	(CFLAGS-vec_d_exp_data.c): Added build of VSX SIMD expf
> 	function and tests. Added vec_math_err.c to build.
> 	* sysdeps/powerpc/powerpc64/fpu/multiarch/(math_config.h)->(math_config_dbl.h)
> 	Renamed, and modified for exp.
> 	* sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c:
> 	Added entry for vector exp.
> 	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c: New file.
> 	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c: Likewise.
> 	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c: Likewise.
> 	* sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist: SIMD expf
> 	added.
> 	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c: Rename of math_config.h
> 	* sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c: Likewise

Looks like some of the issues you fixed in v2 got reverted here.
Fixed.

> diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
> new file mode 100644
> index 0000000000..376531e32b
> --- /dev/null
> +++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
> ...
> +/* Top 12 bits of a double (sign and exponent bits).  */
> +static inline uint32_t top12(double x)
> +{
> +	return asuint64(x) >> 52;
> +}

Something happened here as well and all the coding style issues that you fixed
in v2 got lost.  Starting from this function.
Fixed.

I'm pushing this patch with the fixes I mentioned to branch tuliom/libmvec.

Thanks!

Patch

diff --git a/NEWS b/NEWS
index 26f5c67f75..a33af8c316 100644
--- a/NEWS
+++ b/NEWS
@@ -20,6 +20,7 @@  Major new features:
   - single-precision sine: sinf
   - double-precision sincos: sincos
   - single-precision sincos: sincosf
+  - double-precision exp: exp
   - single-precision exp: expf
 
   GCC support for auto-vectorization of functions on PPC64 is not yet
diff --git a/sysdeps/powerpc/bits/math-vector.h b/sysdeps/powerpc/bits/math-vector.h
index bbc9db0dd9..e7846b4bfa 100644
--- a/sysdeps/powerpc/bits/math-vector.h
+++ b/sysdeps/powerpc/bits/math-vector.h
@@ -46,6 +46,8 @@ 
 #  define __DECL_SIMD_sincosf __DECL_SIMD_PPC64
 #  undef __DECL_SIMD_expf
 #  define __DECL_SIMD_expf __DECL_SIMD_PPC64
+#  undef __DECL_SIMD_exp
+#  define __DECL_SIMD_exp __DECL_SIMD_PPC64
 
 # endif
 #endif
diff --git a/sysdeps/powerpc/powerpc64/fpu/Versions b/sysdeps/powerpc/powerpc64/fpu/Versions
index 7c45e76074..361edee9e7 100644
--- a/sysdeps/powerpc/powerpc64/fpu/Versions
+++ b/sysdeps/powerpc/powerpc64/fpu/Versions
@@ -2,6 +2,6 @@  libmvec {
   GLIBC_2.30 {
     _ZGVbN2v_cos; _ZGVbN4v_cosf; _ZGVbN2v_sin; _ZGVbN4v_sinf;
     _ZGVbN2v_log; _ZGVbN4v_logf; _ZGVbN2vvv_sincos; _ZGVbN4vvv_sincosf;
-    _ZGVbN4v_expf;
+    _ZGVbN4v_expf; _ZGVbN2v_exp;
   }
 }
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
index d15183d5ee..dd982bb068 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/Makefile
@@ -49,7 +49,8 @@  libmvec-sysdep_routines += vec_d_cos2_vsx vec_s_cosf4_vsx \
 			   vec_d_log2_vsx vec_d_log_data \
 			   vec_s_logf4_vsx vec_s_logf_data \
 			   vec_s_expf4_vsx vec_s_exp2f_data \
-			   vec_math_errf \
+			   vec_math_errf vec_math_err \
+			   vec_d_exp2_vsx vec_d_exp_data \
 			   vec_d_sincos2_vsx vec_s_sincosf4_vsx
 CFLAGS-vec_d_cos2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
 CFLAGS-vec_d_log2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
@@ -64,6 +65,9 @@  CFLAGS-vec_d_sincos2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
 CFLAGS-vec_s_sincosf4_vsx.c += -mabi=altivec -maltivec -mvsx
 CFLAGS-vec_s_expf4_vsx.c += -mabi=altivec -maltivec -mvsx
 CFLAGS-vec_s_exp2f_data.c += -mabi=altivec -maltivec -mvsx
+CFLAGS-vec_d_exp2_vsx.c += -mabi=altivec -maltivec -mvsx -mpower8-vector
+CFLAGS-vec_d_exp_data.c += -mabi=altivec -maltivec -mvsx
+CFLAGS-vec_math_err.c += -mabi=altivec -maltivec -mvsx
 endif
 
 # Variables for libmvec tests.
@@ -71,7 +75,7 @@  ifeq ($(subdir),math)
 ifeq ($(build-mathvec),yes)
 libmvec-tests += double-vlen2 float-vlen4
 
-double-vlen2-funcs = cos sin sincos log
+double-vlen2-funcs = cos sin sincos log exp
 float-vlen4-funcs = cos sin sincos log exp
 
 double-vlen2-arch-ext-cflags = -mabi=altivec -maltivec -mvsx -DREQUIRE_VSX
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h b/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
similarity index 95%
rename from sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h
rename to sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
index bd37906ecb..7c94f5b9b2 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config.h
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/math_config_dbl.h
@@ -24,6 +24,7 @@ 
 #include <nan-high-order-bit.h>
 #include <stdint.h>
 #include <altivec.h>
+#include <math-narrow-eval.h>
 
 #ifndef WANT_ROUNDING
 /* Correct special case results in non-nearest rounding modes.  */
@@ -134,13 +135,13 @@  check_uflow (double x)
 #define EXP2_POLY_ORDER 5
 extern const struct exp_data
 {
-  double invln2N;
-  double shift;
-  double negln2hiN;
-  double negln2loN;
-  double poly[4]; /* Last four coefficients.  */
-  double exp2_shift;
-  double exp2_poly[EXP2_POLY_ORDER];
+  vector double invln2N;
+  vector double shift;
+  vector double negln2hiN;
+  vector double negln2loN;
+  vector double poly[4]; /* Last four coefficients.  */
+  vector double exp2_shift;
+  vector double exp2_poly[EXP2_POLY_ORDER];
   uint64_t tab[2*(1 << EXP_TABLE_BITS)];
 } __exp_data attribute_hidden;
 
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
index c9e2dbfdd0..f368e47947 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/test-double-vlen2-wrappers.c
@@ -24,4 +24,5 @@ 
 VECTOR_WRAPPER (WRAPPER_NAME (cos), _ZGVbN2v_cos)
 VECTOR_WRAPPER (WRAPPER_NAME (sin), _ZGVbN2v_sin)
 VECTOR_WRAPPER (WRAPPER_NAME (log), _ZGVbN2v_log)
+VECTOR_WRAPPER (WRAPPER_NAME (exp), _ZGVbN2v_exp)
 VECTOR_WRAPPER_fFF (WRAPPER_NAME (sincos), _ZGVbN2vvv_sincos)
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
new file mode 100644
index 0000000000..376531e32b
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp2_vsx.c
@@ -0,0 +1,197 @@ 
+/* Double-precision vector exp(x) function.
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+/* Based on sysdeps/ieee754/dbl-64/e_exp.c which came from
+   Szabolcs Nagy at ARM Ltd. */
+#include <altivec.h>
+#include <math.h>
+#include <math-barriers.h>
+#include <math-narrow-eval.h>
+
+#include "math_config_dbl.h"
+
+typedef vector long long unsigned v64u;
+typedef union {
+  vector unsigned u;
+  vector float f;
+  v64u l;
+  vector double d;
+} u;
+typedef union {
+  double d;
+  uint64_t l;
+  unsigned u;
+  float f;
+} us;
+
+#define N (1 << EXP_TABLE_BITS)
+#define InvLn2N __exp_data.invln2N
+#define NegLn2hiN __exp_data.negln2hiN
+#define NegLn2loN __exp_data.negln2loN
+#define Shift __exp_data.shift
+#define T __exp_data.tab
+#define C2 __exp_data.poly[5 - EXP_POLY_ORDER]
+#define C3 __exp_data.poly[6 - EXP_POLY_ORDER]
+#define C4 __exp_data.poly[7 - EXP_POLY_ORDER]
+#define C5 __exp_data.poly[8 - EXP_POLY_ORDER]
+
+/* Handle cases that may overflow or underflow when computing the result that
+   is scale*(1+TMP) without intermediate rounding.  The bit representation of
+   scale is in SBITS, however it has a computed exponent that may have
+   overflown into the sign bit so that needs to be adjusted before using it as
+   a double.  (int32_t)KI is the k used in the argument reduction and exponent
+   adjustment of scale, positive k here means the result may overflow and
+   negative k means the result may underflow.  */
+static inline double
+specialcase (double_t tmp, uint64_t sbits, uint64_t ki)
+{
+  double_t scale, y;
+
+  if ((ki & 0x80000000) == 0)
+    {
+      /* k > 0, the exponent of scale might have overflowed by <= 460.  */
+      sbits -= 1009ull << 52;
+      scale = asdouble (sbits);
+      y = 0x1p1009 * (scale + scale * tmp);
+      return y;
+    }
+  /* k < 0, need special care in the subnormal range.  */
+  sbits += 1022ull << 52;
+  scale = asdouble (sbits);
+  y = scale + scale * tmp;
+  if (y < 1.0)
+    {
+      /* Round y to the right precision before scaling it into the subnormal
+	 range to avoid double rounding that can cause 0.5+E/2 ulp error where
+	 E is the worst-case ulp error outside the subnormal range.  So this
+	 is only useful if the goal is better than 1 ulp worst-case error.  */
+      double_t hi, lo;
+      lo = scale - y + scale * tmp;
+      hi = 1.0 + y;
+      lo = 1.0 - hi + y + lo;
+      y = math_narrow_eval (hi + lo) - 1.0;
+      /* Avoid -0.0 with downward rounding.  */
+      if (WANT_ROUNDING && y == 0.0)
+	y = 0.0;
+      /* The underflow exception needs to be signaled explicitly.  */
+      math_force_eval (math_opt_barrier (0x1p-1022) * 0x1p-1022);
+    }
+  y = 0x1p-1022 * y;
+  return y;
+}
+
+/* Top 12 bits of a double (sign and exponent bits).  */
+static inline uint32_t top12(double x)
+{
+	return asuint64(x) >> 52;
+}
+
+vector double
+_ZGVbN2v_exp (vector double x)
+{
+	v64u abstop, is_special_case, is_special_case2, idx, top, sbits;
+	vector double kd, z, r, r2, scale, tail, tmp;
+	u t, t2;
+	u res;
+	u xu;
+	xu.d = x;
+	v64u zero = {0, 0};
+	u c512;
+	vector double load = {512.0, 512.0};
+	c512.d = load;
+	u normalize;
+	vector double load2 = {0x1p-54, 0x1p-54};
+	normalize.d = load2;
+	c512.l &= 0x7ff0000000000000;
+	normalize.l &= 0x7ff0000000000000;
+	abstop = xu.l & 0x7ff0000000000000;
+	is_special_case = (v64u) vec_cmpge (xu.l - normalize.l, c512.l - normalize.l);
+	if (__glibc_unlikely (!vec_all_eq (is_special_case, zero)))
+	{
+		for (int m=0;m<2;++m)
+		{
+			if (!is_special_case[m])
+				continue;
+			double v;
+			uint32_t abstops = abstop[m] >> 52;
+			if (!is_special_case[m])
+				continue;
+			v = x[m];
+			if (abstops - top12(0x1p-54) >= 0x80000000)
+				/* Avoid spurious underflow for tiny x.  */
+				/* Note: 0 is common input.  */
+				res.d[m] = WANT_ROUNDING ? 1.0 + v : 1.0;
+			if (abstops >= top12(1024.0)) {
+				if (asuint64(v) == asuint64(-INFINITY))
+					res.d[m] = 0.0;
+				else if (abstops >= top12(INFINITY))
+					res.d[m] = 1.0 + v;
+				else if (asuint64(v) >> 63)
+					res.d[m] = __math_uflow(0);
+				else
+					res.d[m] = __math_oflow(0);
+				/* prevent is_special_case2 from matching */
+				abstop[m] = 1;
+			} else {
+	 			/* Large x is special cased below.  */
+ 				abstop[m] = 0;
+				is_special_case[m] = 0;
+			}
+		}
+	}
+	/* exp(x) = 2^(k/N) * exp(r), with exp(r) in [2^(-1/2N),2^(1/2N)].  */
+	/* x = ln2/N*k + r, with int k and r in [-ln2/2N, ln2/2N].  */
+	z = InvLn2N * x;
+	u kdu;
+	/* z - kd is in [-1, 1] in non-nearest rounding modes.  */
+	kd = z + Shift;
+	kdu.d = kd;
+	kd -= Shift;
+	r = x + kd * NegLn2hiN + kd * NegLn2loN;
+	/* 2^(k/N) ~= scale * (1 + tail).  */
+	idx = 2 * (kdu.l % N);
+	top = kdu.l << (52 - EXP_TABLE_BITS);
+	v64u load3 = {T[idx[0]], T[idx[1]]};
+	t.l = load3;
+	v64u load4 = {T[idx[0] + 1], T[idx[1] + 1]};
+	t2.l = load4;
+	tail = t.d;
+	/* This is only a valid scale when -1023*N < k < 1024*N.  */
+	sbits = t2.l + top;
+	/* exp(x) = 2^(k/N) * exp(r) ~= scale + scale * (tail + exp(r) - 1).  */
+	/* Evaluation is optimized assuming superscalar pipelined execution.  */
+	r2 = r * r;
+	/* Without fma the worst case error is 0.25/N ulp larger.  */
+	/* Worst case error is less than 0.5+1.11/N+(abs poly error * 2^53) ulp.  */
+	tmp = tail + r + r2 * (C2 + r * C3) + r2 * r2 * (C4 + r * C5);
+	is_special_case2 = (v64u) vec_cmpeq (abstop, zero);
+	if (__glibc_unlikely (!vec_all_eq (is_special_case2, zero)))
+	{
+		u sc2;
+		for (int m=0;m<2;++m)
+		{
+			sc2.d[m] = specialcase(tmp[m], sbits[m], kdu.l[m]);
+		}
+		res.l = vec_sel (res.l, sc2.l, is_special_case2);
+	}
+	u sbitsu;
+	sbitsu.l = sbits;
+	scale = sbitsu.d;
+	u res2;
+	res2.d = scale + scale * tmp;
+	/* Note: tmp == 0 or |tmp| > 2^-200 and scale > 2^-739, so there
+	   is no spurious underflow here even without fma.  */
+	res.l = vec_sel (res.l, res2.l, ~is_special_case & ~is_special_case2);
+	return res.d;
+}
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
new file mode 100644
index 0000000000..208b897d04
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_exp_data.c
@@ -0,0 +1,202 @@ 
+/* Shared data between vector exp, exp2 and pow
+   Copyright (C) 2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+/* Based on sysdeps/ieee754/dbl-64/e_exp.c which came from
+   Szabolcs Nagy at ARM Ltd. */
+
+#include "math_config_dbl.h"
+
+#define N (1 << EXP_TABLE_BITS)
+
+const struct exp_data __exp_data = {
+// N/ln2
+.invln2N = {
+  0x1.71547652b82fep0 * N,
+  0x1.71547652b82fep0 * N,
+},
+// -ln2/N
+.negln2hiN = {
+  -0x1.62e42fefa0000p-8,
+  -0x1.62e42fefa0000p-8,
+},
+.negln2loN = {
+  -0x1.cf79abc9e3b3ap-47,
+  -0x1.cf79abc9e3b3ap-47,
+},
+.shift = {
+  0x1.8p52,
+  0x1.8p52,
+},
+// exp polynomial coefficients.
+.poly = {
+// abs error: 1.555*2^-66
+// ulp error: 0.509 (0.511 without fma)
+// if |x| < ln2/256+eps
+// abs error if |x| < ln2/256+0x1p-15: 1.09*2^-65
+// abs error if |x| < ln2/128: 1.7145*2^-56
+{0x1.ffffffffffdbdp-2, 0x1.ffffffffffdbdp-2},
+{0x1.555555555543cp-3, 0x1.555555555543cp-3},
+{0x1.55555cf172b91p-5, 0x1.55555cf172b91p-5},
+{0x1.1111167a4d017p-7, 0x1.1111167a4d017p-7},
+},
+.exp2_shift = {
+  0x1.8p52 / N,
+  0x1.8p52 / N,
+},
+// exp2 polynomial coefficients.
+.exp2_poly = {
+// abs error: 1.2195*2^-65
+// ulp error: 0.507 (0.511 without fma)
+// if |x| < 1/256
+// abs error if |x| < 1/128: 1.9941*2^-56
+{0x1.62e42fefa39efp-1, 0x1.62e42fefa39efp-1},
+{0x1.ebfbdff82c424p-3, 0x1.ebfbdff82c424p-3},
+{0x1.c6b08d70cf4b5p-5, 0x1.c6b08d70cf4b5p-5},
+{0x1.3b2abd24650ccp-7, 0x1.3b2abd24650ccp-7},
+{0x1.5d7e09b4e3a84p-10, 0x1.5d7e09b4e3a84p-10},
+},
+// 2^(k/N) ~= H[k]*(1 + T[k]) for int k in [0,N)
+// tab[2*k] = asuint64(T[k])
+// tab[2*k+1] = asuint64(H[k]) - (k << 52)/N
+.tab = {
+0x0, 0x3ff0000000000000,
+0x3c9b3b4f1a88bf6e, 0x3feff63da9fb3335,
+0xbc7160139cd8dc5d, 0x3fefec9a3e778061,
+0xbc905e7a108766d1, 0x3fefe315e86e7f85,
+0x3c8cd2523567f613, 0x3fefd9b0d3158574,
+0xbc8bce8023f98efa, 0x3fefd06b29ddf6de,
+0x3c60f74e61e6c861, 0x3fefc74518759bc8,
+0x3c90a3e45b33d399, 0x3fefbe3ecac6f383,
+0x3c979aa65d837b6d, 0x3fefb5586cf9890f,
+0x3c8eb51a92fdeffc, 0x3fefac922b7247f7,
+0x3c3ebe3d702f9cd1, 0x3fefa3ec32d3d1a2,
+0xbc6a033489906e0b, 0x3fef9b66affed31b,
+0xbc9556522a2fbd0e, 0x3fef9301d0125b51,
+0xbc5080ef8c4eea55, 0x3fef8abdc06c31cc,
+0xbc91c923b9d5f416, 0x3fef829aaea92de0,
+0x3c80d3e3e95c55af, 0x3fef7a98c8a58e51,
+0xbc801b15eaa59348, 0x3fef72b83c7d517b,
+0xbc8f1ff055de323d, 0x3fef6af9388c8dea,
+0x3c8b898c3f1353bf, 0x3fef635beb6fcb75,
+0xbc96d99c7611eb26, 0x3fef5be084045cd4,
+0x3c9aecf73e3a2f60, 0x3fef54873168b9aa,
+0xbc8fe782cb86389d, 0x3fef4d5022fcd91d,
+0x3c8a6f4144a6c38d, 0x3fef463b88628cd6,
+0x3c807a05b0e4047d, 0x3fef3f49917ddc96,
+0x3c968efde3a8a894, 0x3fef387a6e756238,
+0x3c875e18f274487d, 0x3fef31ce4fb2a63f,
+0x3c80472b981fe7f2, 0x3fef2b4565e27cdd,
+0xbc96b87b3f71085e, 0x3fef24dfe1f56381,
+0x3c82f7e16d09ab31, 0x3fef1e9df51fdee1,
+0xbc3d219b1a6fbffa, 0x3fef187fd0dad990,
+0x3c8b3782720c0ab4, 0x3fef1285a6e4030b,
+0x3c6e149289cecb8f, 0x3fef0cafa93e2f56,
+0x3c834d754db0abb6, 0x3fef06fe0a31b715,
+0x3c864201e2ac744c, 0x3fef0170fc4cd831,
+0x3c8fdd395dd3f84a, 0x3feefc08b26416ff,
+0xbc86a3803b8e5b04, 0x3feef6c55f929ff1,
+0xbc924aedcc4b5068, 0x3feef1a7373aa9cb,
+0xbc9907f81b512d8e, 0x3feeecae6d05d866,
+0xbc71d1e83e9436d2, 0x3feee7db34e59ff7,
+0xbc991919b3ce1b15, 0x3feee32dc313a8e5,
+0x3c859f48a72a4c6d, 0x3feedea64c123422,
+0xbc9312607a28698a, 0x3feeda4504ac801c,
+0xbc58a78f4817895b, 0x3feed60a21f72e2a,
+0xbc7c2c9b67499a1b, 0x3feed1f5d950a897,
+0x3c4363ed60c2ac11, 0x3feece086061892d,
+0x3c9666093b0664ef, 0x3feeca41ed1d0057,
+0x3c6ecce1daa10379, 0x3feec6a2b5c13cd0,
+0x3c93ff8e3f0f1230, 0x3feec32af0d7d3de,
+0x3c7690cebb7aafb0, 0x3feebfdad5362a27,
+0x3c931dbdeb54e077, 0x3feebcb299fddd0d,
+0xbc8f94340071a38e, 0x3feeb9b2769d2ca7,
+0xbc87deccdc93a349, 0x3feeb6daa2cf6642,
+0xbc78dec6bd0f385f, 0x3feeb42b569d4f82,
+0xbc861246ec7b5cf6, 0x3feeb1a4ca5d920f,
+0x3c93350518fdd78e, 0x3feeaf4736b527da,
+0x3c7b98b72f8a9b05, 0x3feead12d497c7fd,
+0x3c9063e1e21c5409, 0x3feeab07dd485429,
+0x3c34c7855019c6ea, 0x3feea9268a5946b7,
+0x3c9432e62b64c035, 0x3feea76f15ad2148,
+0xbc8ce44a6199769f, 0x3feea5e1b976dc09,
+0xbc8c33c53bef4da8, 0x3feea47eb03a5585,
+0xbc845378892be9ae, 0x3feea34634ccc320,
+0xbc93cedd78565858, 0x3feea23882552225,
+0x3c5710aa807e1964, 0x3feea155d44ca973,
+0xbc93b3efbf5e2228, 0x3feea09e667f3bcd,
+0xbc6a12ad8734b982, 0x3feea012750bdabf,
+0xbc6367efb86da9ee, 0x3fee9fb23c651a2f,
+0xbc80dc3d54e08851, 0x3fee9f7df9519484,
+0xbc781f647e5a3ecf, 0x3fee9f75e8ec5f74,
+0xbc86ee4ac08b7db0, 0x3fee9f9a48a58174,
+0xbc8619321e55e68a, 0x3fee9feb564267c9,
+0x3c909ccb5e09d4d3, 0x3feea0694fde5d3f,
+0xbc7b32dcb94da51d, 0x3feea11473eb0187,
+0x3c94ecfd5467c06b, 0x3feea1ed0130c132,
+0x3c65ebe1abd66c55, 0x3feea2f336cf4e62,
+0xbc88a1c52fb3cf42, 0x3feea427543e1a12,
+0xbc9369b6f13b3734, 0x3feea589994cce13,
+0xbc805e843a19ff1e, 0x3feea71a4623c7ad,
+0xbc94d450d872576e, 0x3feea8d99b4492ed,
+0x3c90ad675b0e8a00, 0x3feeaac7d98a6699,
+0x3c8db72fc1f0eab4, 0x3feeace5422aa0db,
+0xbc65b6609cc5e7ff, 0x3feeaf3216b5448c,
+0x3c7bf68359f35f44, 0x3feeb1ae99157736,
+0xbc93091fa71e3d83, 0x3feeb45b0b91ffc6,
+0xbc5da9b88b6c1e29, 0x3feeb737b0cdc5e5,
+0xbc6c23f97c90b959, 0x3feeba44cbc8520f,
+0xbc92434322f4f9aa, 0x3feebd829fde4e50,
+0xbc85ca6cd7668e4b, 0x3feec0f170ca07ba,
+0x3c71affc2b91ce27, 0x3feec49182a3f090,
+0x3c6dd235e10a73bb, 0x3feec86319e32323,
+0xbc87c50422622263, 0x3feecc667b5de565,
+0x3c8b1c86e3e231d5, 0x3feed09bec4a2d33,
+0xbc91bbd1d3bcbb15, 0x3feed503b23e255d,
+0x3c90cc319cee31d2, 0x3feed99e1330b358,
+0x3c8469846e735ab3, 0x3feede6b5579fdbf,
+0xbc82dfcd978e9db4, 0x3feee36bbfd3f37a,
+0x3c8c1a7792cb3387, 0x3feee89f995ad3ad,
+0xbc907b8f4ad1d9fa, 0x3feeee07298db666,
+0xbc55c3d956dcaeba, 0x3feef3a2b84f15fb,
+0xbc90a40e3da6f640, 0x3feef9728de5593a,
+0xbc68d6f438ad9334, 0x3feeff76f2fb5e47,
+0xbc91eee26b588a35, 0x3fef05b030a1064a,
+0x3c74ffd70a5fddcd, 0x3fef0c1e904bc1d2,
+0xbc91bdfbfa9298ac, 0x3fef12c25bd71e09,
+0x3c736eae30af0cb3, 0x3fef199bdd85529c,
+0x3c8ee3325c9ffd94, 0x3fef20ab5fffd07a,
+0x3c84e08fd10959ac, 0x3fef27f12e57d14b,
+0x3c63cdaf384e1a67, 0x3fef2f6d9406e7b5,
+0x3c676b2c6c921968, 0x3fef3720dcef9069,
+0xbc808a1883ccb5d2, 0x3fef3f0b555dc3fa,
+0xbc8fad5d3ffffa6f, 0x3fef472d4a07897c,
+0xbc900dae3875a949, 0x3fef4f87080d89f2,
+0x3c74a385a63d07a7, 0x3fef5818dcfba487,
+0xbc82919e2040220f, 0x3fef60e316c98398,
+0x3c8e5a50d5c192ac, 0x3fef69e603db3285,
+0x3c843a59ac016b4b, 0x3fef7321f301b460,
+0xbc82d52107b43e1f, 0x3fef7c97337b9b5f,
+0xbc892ab93b470dc9, 0x3fef864614f5a129,
+0x3c74b604603a88d3, 0x3fef902ee78b3ff6,
+0x3c83c5ec519d7271, 0x3fef9a51fbc74c83,
+0xbc8ff7128fd391f0, 0x3fefa4afa2a490da,
+0xbc8dae98e223747d, 0x3fefaf482d8e67f1,
+0x3c8ec3bc41aa2008, 0x3fefba1bee615a27,
+0x3c842b94c3a9eb32, 0x3fefc52b376bba97,
+0x3c8a64a931d185ee, 0x3fefd0765b6e4540,
+0xbc8e37bae43be3ed, 0x3fefdbfdad9cbe14,
+0x3c77893b4d91cd9d, 0x3fefe7c1819e90d8,
+0x3c5305c14160cc89, 0x3feff3c22b8f71f1,
+},
+};
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
index d7588a7929..3a9fb05aee 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log2_vsx.c
@@ -21,7 +21,7 @@ 
 #include <math/math-svid-compat.h>
 #include <shlib-compat.h>
 #include <libm-alias-double.h>
-#include "math_config.h"
+#include "math_config_dbl.h"
 #include <altivec.h>
 
 #define T __log_data.tab
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
index 2fe569576c..f1299404c4 100644
--- a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_d_log_data.c
@@ -16,7 +16,7 @@ 
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include "math_config.h"
+#include "math_config_dbl.h"
 
 #define N (1 << LOG_TABLE_BITS)
 
diff --git a/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
new file mode 100644
index 0000000000..e60b0d232f
--- /dev/null
+++ b/sysdeps/powerpc/powerpc64/fpu/multiarch/vec_math_err.c
@@ -0,0 +1,40 @@ 
+/* Double-precision math error handling.
+   Copyright (C) 2017-2019 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#include <fpu/math-barriers.h>
+#include "math_config_dbl.h"
+
+/* NOINLINE reduces code size.  */
+NOINLINE static double
+xflow (uint32_t sign, double y)
+{
+  y = math_opt_barrier (sign ? -y : y) * y;
+  return y;
+}
+
+attribute_hidden double
+__math_uflow (uint32_t sign)
+{
+  return xflow (sign, 0x1p-767);
+}
+
+attribute_hidden double
+__math_oflow (uint32_t sign)
+{
+  return xflow (sign, 0x1p769);
+}
diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
index bfbd340626..46558dbd77 100644
--- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
+++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/libmvec.abilist
@@ -1,4 +1,5 @@ 
 GLIBC_2.30 _ZGVbN2v_cos F
+GLIBC_2.30 _ZGVbN2v_exp F
 GLIBC_2.30 _ZGVbN2v_log F
 GLIBC_2.30 _ZGVbN2v_sin F
 GLIBC_2.30 _ZGVbN2vvv_sincos F