[v2,3/3] RISC-V: Limit regs use for zfinx extension
Commit Message
Limit zfinx abi support with 'ilp32','ilp32e','lp64' only.
Use GPR instead FPR when 'zfinx' enable, Only use even registers in RV32 when 'zdinx' enable.
gcc/ChangeLog:
* config/riscv/constraints.md
(TARGET_HARD_FLOAT ? FP_REGS : ((TARGET_ZFINX || TARGET_ZDINX) ? GR_REGS : NO_REGS)):
Use gpr when zfinx or zdinx enable.
* config/riscv/riscv.c (riscv_hard_regno_mode_ok): Add TARGET_ZFINX.
(riscv_option_override): Ditto.
(riscv_abi): Add ABI limit for zfinx.
Co-Authored-By: sinan <sinan@isrc.iscas.ac.cn>
---
gcc/config/riscv/constraints.md | 3 ++-
gcc/config/riscv/riscv.c | 14 +++++++++++++-
2 files changed, 15 insertions(+), 2 deletions(-)
@@ -20,8 +20,9 @@
;; <http://www.gnu.org/licenses/>.
;; Register constraints
+;; Zfinx support need refuse FPR and use GPR
-(define_register_constraint "f" "TARGET_HARD_FLOAT ? FP_REGS : NO_REGS"
+(define_register_constraint "f" "TARGET_HARD_FLOAT ? FP_REGS : ((TARGET_ZFINX || TARGET_ZDINX) ? GR_REGS : NO_REGS)"
"A floating-point register (if available).")
(define_register_constraint "j" "SIBCALL_REGS"
@@ -4789,6 +4789,13 @@ riscv_hard_regno_mode_ok (unsigned int regno, machine_mode mode)
!= call_used_or_fixed_reg_p (regno + i))
return false;
+ /* Only use even registers in RV32 ZDINX */
+ if (!TARGET_64BIT && TARGET_ZDINX){
+ if (GET_MODE_CLASS (mode) == MODE_FLOAT &&
+ GET_MODE_UNIT_SIZE (mode) == GET_MODE_SIZE (DFmode))
+ return !(regno & 1);
+ }
+
return true;
}
@@ -4980,7 +4987,7 @@ riscv_option_override (void)
error ("%<-mdiv%> requires %<-march%> to subsume the %<M%> extension");
/* Likewise floating-point division and square root. */
- if (TARGET_HARD_FLOAT && (target_flags_explicit & MASK_FDIV) == 0)
+ if ((TARGET_HARD_FLOAT || TARGET_ZFINX) && (target_flags_explicit & MASK_FDIV) == 0)
target_flags |= MASK_FDIV;
/* Handle -mtune, use -mcpu if -mtune is not given, and use default -mtune
@@ -5026,6 +5033,11 @@ riscv_option_override (void)
if (TARGET_RVE && riscv_abi != ABI_ILP32E)
error ("rv32e requires ilp32e ABI");
+ // Zfinx require abi ilp32,ilp32e or lp64.
+ if (TARGET_ZFINX && riscv_abi != ABI_ILP32
+ && riscv_abi != ABI_LP64 && riscv_abi != ABI_ILP32E)
+ error ("z*inx requires ABI ilp32, ilp32e or lp64");
+
/* We do not yet support ILP32 on RV64. */
if (BITS_PER_WORD != POINTER_SIZE)
error ("ABI requires %<-march=rv%d%>", POINTER_SIZE);