From 7c8fc6b414dc1718e71e0d05c7a78498e06eb499 Mon Sep 17 00:00:00 2001 From: Lulu Cheng Date: Thu, 29 Jun 2023 19:30:59 +0800 Subject: [PATCH 053/124] LoongArch: Fix bug in loongarch_emit_stack_tie [PR110484]. 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 Signed-off-by: Peng Fan Signed-off-by: ticat_fp --- 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 caacfa8a3..7b48e3216 100644 --- a/gcc/config/loongarch/loongarch.cc +++ b/gcc/config/loongarch/loongarch.cc @@ -1109,7 +1109,9 @@ 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) -- 2.33.0