From 46861167f548ec622918d95acd2424b64f56797d Mon Sep 17 00:00:00 2001 From: "Maciej W. Rozycki" Date: Sun, 12 Jan 2025 16:48:53 +0000 Subject: [PATCH] Alpha: Add memory clobbers to `builtin_longjmp' expansion Add the same memory clobbers to `builtin_longjmp' for Alpha as with commit 41439bf6a647 ("builtins.c (expand_builtin_longjmp): Added two memory clobbers."), to prevent instructions that access memory via the frame or stack pointer from being moved across the write to the frame pointer. gcc/ * config/alpha/alpha.md (builtin_longjmp): Add memory clobbers. --- gcc/config/alpha/alpha.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/gcc/config/alpha/alpha.md b/gcc/config/alpha/alpha.md index 376c4cba90c5..35c8030422f5 100644 --- a/gcc/config/alpha/alpha.md +++ b/gcc/config/alpha/alpha.md @@ -5005,6 +5005,8 @@ rtx pv = gen_rtx_REG (Pmode, 27); /* This bit is the same as expand_builtin_longjmp. */ + emit_clobber (gen_rtx_MEM (BLKmode, gen_rtx_SCRATCH (VOIDmode))); + emit_clobber (gen_rtx_MEM (BLKmode, hard_frame_pointer_rtx)); emit_move_insn (hard_frame_pointer_rtx, fp); emit_move_insn (pv, lab); emit_stack_restore (SAVE_NONLOCAL, stack); -- 2.47.2