57 lines
2.2 KiB
Diff
57 lines
2.2 KiB
Diff
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From 7bb1a356ca9eefab48d64bd3deeaac081c1ae7ea Mon Sep 17 00:00:00 2001
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From: Li Wei <liwei@loongson.cn>
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Date: Thu, 11 Jan 2024 19:36:33 +0800
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Subject: [PATCH 111/188] LoongArch: Redundant sign extension elimination
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optimization 2.
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Eliminate the redundant sign extension that exists after the conditional
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move when the target register is SImode.
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gcc/ChangeLog:
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* config/loongarch/loongarch.cc (loongarch_expand_conditional_move):
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Adjust.
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gcc/testsuite/ChangeLog:
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* gcc.target/loongarch/sign-extend-2.c: Adjust.
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---
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gcc/config/loongarch/loongarch.cc | 6 ++++++
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gcc/testsuite/gcc.target/loongarch/sign-extend-2.c | 5 +++--
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2 files changed, 9 insertions(+), 2 deletions(-)
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diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc
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index 533bae5b2..13481130b 100644
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--- a/gcc/config/loongarch/loongarch.cc
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+++ b/gcc/config/loongarch/loongarch.cc
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@@ -5367,6 +5367,12 @@ loongarch_expand_conditional_move (rtx *operands)
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rtx temp3 = gen_reg_rtx (mode);
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emit_insn (gen_rtx_SET (temp3, gen_rtx_IOR (mode, temp, temp2)));
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temp3 = gen_lowpart (GET_MODE (operands[0]), temp3);
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+ /* Nonzero in a subreg if it was made when accessing an object that
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+ was promoted to a wider mode in accord with the PROMOTED_MODE
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+ machine description macro. */
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+ SUBREG_PROMOTED_VAR_P (temp3) = 1;
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+ /* Sets promoted mode for SUBREG_PROMOTED_VAR_P. */
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+ SUBREG_PROMOTED_SET (temp3, SRP_SIGNED);
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loongarch_emit_move (operands[0], temp3);
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}
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else
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diff --git a/gcc/testsuite/gcc.target/loongarch/sign-extend-2.c b/gcc/testsuite/gcc.target/loongarch/sign-extend-2.c
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index a45dde4f7..e57a2727d 100644
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--- a/gcc/testsuite/gcc.target/loongarch/sign-extend-2.c
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+++ b/gcc/testsuite/gcc.target/loongarch/sign-extend-2.c
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@@ -1,6 +1,7 @@
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/* { dg-do compile } */
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-/* { dg-options "-mabi=lp64d -O2" } */
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-/* { dg-final { scan-assembler-times "slli.w\t\\\$r\[0-9\]+,\\\$r\[0-9\]+,0" 1 } } */
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+/* { dg-options "-mabi=lp64d -O2 -fdump-rtl-expand" } */
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+/* { dg-final { scan-rtl-dump "subreg/s" "expand" } } */
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+/* { dg-final { scan-assembler-not "slli.w\t\\\$r\[0-9\]+,\\\$r\[0-9\]+,0" } } */
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#include <stdint.h>
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#define my_min(x, y) ((x) < (y) ? (x) : (y))
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--
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2.43.0
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