36 lines
1017 B
Diff
36 lines
1017 B
Diff
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From 35bce671a97b27a41c425109ba92b24ab87ff35b Mon Sep 17 00:00:00 2001
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From: Xi Ruoyao <xry111@xry111.site>
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Date: Tue, 17 Oct 2023 21:55:05 +0800
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Subject: [PATCH 010/188] LoongArch: Use fcmp.caf.s instead of movgr2cf for
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zeroing a fcc
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During the review of an LLVM change [1], on LA464 we found that zeroing
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an fcc with fcmp.caf.s is much faster than a movgr2cf from $r0.
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[1]: https://github.com/llvm/llvm-project/pull/69300
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gcc/ChangeLog:
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* config/loongarch/loongarch.md (movfcc): Use fcmp.caf.s for
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zeroing a fcc.
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---
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gcc/config/loongarch/loongarch.md | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/gcc/config/loongarch/loongarch.md b/gcc/config/loongarch/loongarch.md
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index 73e2cbe0b..5f9e63d66 100644
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--- a/gcc/config/loongarch/loongarch.md
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+++ b/gcc/config/loongarch/loongarch.md
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@@ -2150,7 +2150,7 @@
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[(set (match_operand:FCC 0 "register_operand" "=z")
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(const_int 0))]
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""
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- "movgr2cf\t%0,$r0")
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+ "fcmp.caf.s\t%0,$f0,$f0")
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;; Conditional move instructions.
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--
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2.43.0
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