https://gcc.gnu.org/g:dea7b9a78b11b5ca0c85b971521144ba07a66aca
commit r16-178-gdea7b9a78b11b5ca0c85b971521144ba07a66aca
Author: LIU Hao <lh_mo...@126.com>
Date: Sun Apr 27 18:18:34 2025 +0800
gcc: For Windows x86-32, always attempt to realign stack regardless of SSE
For Windows x86-32 targets, the Microsoft ABI only guarantees that the stack
is aligned to 4-byte boundaries. GCC knows about the default alignment of
the
stack. However, before this commit, it did not realign the stack unless SSE
was also enabled.
When a stricter (larger) alignment is requested, it's always necessary to
realign the stack, as what Solaris does.
Reference: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111107#c14
Signed-off-by: LIU Hao <lh_mo...@126.com>
Signed-off-by: Jonathan Yong <10wa...@gmail.com>
gcc/ChangeLog:
PR target/111107
* config/i386/cygming.h (STACK_REALIGN_DEFAULT): Copy from sol2.h.
Diff:
---
gcc/config/i386/cygming.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/config/i386/cygming.h b/gcc/config/i386/cygming.h
index 3ddcbecb22fd..d587d25a58a8 100644
--- a/gcc/config/i386/cygming.h
+++ b/gcc/config/i386/cygming.h
@@ -36,7 +36,7 @@ along with GCC; see the file COPYING3. If not see
/* 32-bit Windows aligns the stack on a 4-byte boundary but SSE instructions
may require 16-byte alignment. */
#undef STACK_REALIGN_DEFAULT
-#define STACK_REALIGN_DEFAULT TARGET_SSE
+#define STACK_REALIGN_DEFAULT (TARGET_64BIT ? 0 : 1)
/* Support hooks for SEH. */
#undef TARGET_ASM_UNWIND_EMIT
