From: Lulu Cheng <chengl...@loongson.cn>
Which may result in implicit references to $fp when frame_pointer_needed is
false,
causing regs_ever_live[$fp] to be true when $fp is not explicitly used,
resulting in $fp being used as the target replacement register in the rnreg
pass.
The bug originates from SPEC2017 541.leela_r(-flto).
gcc/ChangeLog:
PR target/110484
* config/loongarch/loongarch.cc (loongarch_emit_stack_tie): Use the
frame_pointer_needed to determine whether to use the $fp register.
Co-authored-by: Guo Jie <guo...@loongson.cn>
---
gcc/config/loongarch/loongarch.cc | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/gcc/config/loongarch/loongarch.cc
b/gcc/config/loongarch/loongarch.cc
index 5b8b93eb24b..aa470aafd7b 100644
--- a/gcc/config/loongarch/loongarch.cc
+++ b/gcc/config/loongarch/loongarch.cc
@@ -1112,7 +1112,9 @@ loongarch_first_stack_step (struct loongarch_frame_info
*frame)
static void
loongarch_emit_stack_tie (void)
{
- emit_insn (gen_stack_tie (Pmode, stack_pointer_rtx, hard_frame_pointer_rtx));
+ emit_insn (gen_stack_tie (Pmode, stack_pointer_rtx,
+ frame_pointer_needed ? hard_frame_pointer_rtx
+ : stack_pointer_rtx));
}
#define PROBE_INTERVAL (1 << STACK_CHECK_PROBE_INTERVAL_EXP)
--
2.31.1
