44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
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From 7c8fc6b414dc1718e71e0d05c7a78498e06eb499 Mon Sep 17 00:00:00 2001
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From: Lulu Cheng <chenglulu@loongson.cn>
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Date: Thu, 29 Jun 2023 19:30:59 +0800
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Subject: [PATCH 053/124] LoongArch: Fix bug in loongarch_emit_stack_tie
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[PR110484].
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Which may result in implicit references to $fp when frame_pointer_needed is false,
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causing regs_ever_live[$fp] to be true when $fp is not explicitly used,
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resulting in $fp being used as the target replacement register in the rnreg pass.
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The bug originates from SPEC2017 541.leela_r(-flto).
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gcc/ChangeLog:
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PR target/110484
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* config/loongarch/loongarch.cc (loongarch_emit_stack_tie): Use the
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frame_pointer_needed to determine whether to use the $fp register.
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Co-authored-by: Guo Jie <guojie@loongson.cn>
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Signed-off-by: Peng Fan <fanpeng@loongson.cn>
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Signed-off-by: ticat_fp <fanpeng@loongson.cn>
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---
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gcc/config/loongarch/loongarch.cc | 4 +++-
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1 file changed, 3 insertions(+), 1 deletion(-)
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diff --git a/gcc/config/loongarch/loongarch.cc b/gcc/config/loongarch/loongarch.cc
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index caacfa8a3..7b48e3216 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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@@ -1109,7 +1109,9 @@ loongarch_first_stack_step (struct loongarch_frame_info *frame)
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static void
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loongarch_emit_stack_tie (void)
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{
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- emit_insn (gen_stack_tie (Pmode, stack_pointer_rtx, hard_frame_pointer_rtx));
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+ emit_insn (gen_stack_tie (Pmode, stack_pointer_rtx,
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+ frame_pointer_needed ? hard_frame_pointer_rtx
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+ : stack_pointer_rtx));
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}
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#define PROBE_INTERVAL (1 << STACK_CHECK_PROBE_INTERVAL_EXP)
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--
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2.33.0
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