From 1967f21d000e09d3d3190317af7923b578ce02b1 Mon Sep 17 00:00:00 2001 From: Lulu Cheng Date: Thu, 29 Jun 2023 19:30:59 +0800 Subject: [PATCH] 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 --- 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 1905599b9e8b..c72229cad87c 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) -- 2.47.2