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* [gcc r13-2440] RISC-V: Fix division instructions for `m` with `zmmul` extension.
@ 2022-09-05 13:46 Kito Cheng
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From: Kito Cheng @ 2022-09-05 13:46 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:ae97ba1efcd66d73d3631addf4c09f55e12d34f5
commit r13-2440-gae97ba1efcd66d73d3631addf4c09f55e12d34f5
Author: Kito Cheng <kito.cheng@sifive.com>
Date: Mon Sep 5 21:36:45 2022 +0800
RISC-V: Fix division instructions for `m` with `zmmul` extension.
gcc/ChangeLog:
* config/riscv/riscv.cc (riscv_option_override): Fix wrong
condition for MASK_DIV and simplify incompatible checking.
* config/riscv/riscv.md (muldi3): Adding parentheses.
Diff:
---
gcc/config/riscv/riscv.cc | 8 ++------
gcc/config/riscv/riscv.md | 2 +-
2 files changed, 3 insertions(+), 7 deletions(-)
diff --git a/gcc/config/riscv/riscv.cc b/gcc/config/riscv/riscv.cc
index b5252b41df7..675d92c0961 100644
--- a/gcc/config/riscv/riscv.cc
+++ b/gcc/config/riscv/riscv.cc
@@ -5277,14 +5277,10 @@ riscv_option_override (void)
/* The presence of the M extension implies that division instructions
are present, so include them unless explicitly disabled. */
if (TARGET_MUL && (target_flags_explicit & MASK_DIV) == 0)
- if(!TARGET_ZMMUL)
- target_flags |= MASK_DIV;
+ target_flags |= MASK_DIV;
else if (!TARGET_MUL && TARGET_DIV)
error ("%<-mdiv%> requires %<-march%> to subsume the %<M%> extension");
-
- if(TARGET_ZMMUL && !TARGET_MUL && TARGET_DIV)
- warning (0, "%<-mdiv%> cannot be used when %<ZMMUL%> extension is present");
-
+
/* Likewise floating-point division and square root. */
if (TARGET_HARD_FLOAT && (target_flags_explicit & MASK_FDIV) == 0)
target_flags |= MASK_FDIV;
diff --git a/gcc/config/riscv/riscv.md b/gcc/config/riscv/riscv.md
index d2dfde28e31..014206fb8bd 100644
--- a/gcc/config/riscv/riscv.md
+++ b/gcc/config/riscv/riscv.md
@@ -752,7 +752,7 @@
[(set (match_operand:DI 0 "register_operand" "=r")
(mult:DI (match_operand:DI 1 "register_operand" " r")
(match_operand:DI 2 "register_operand" " r")))]
- "TARGET_ZMMUL || TARGET_MUL && TARGET_64BIT"
+ "(TARGET_ZMMUL || TARGET_MUL) && TARGET_64BIT"
"mul\t%0,%1,%2"
[(set_attr "type" "imul")
(set_attr "mode" "DI")])
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