Switch from `xorq %rax, %rax` to `xorl %eax, %eax`. In 64-bit mode, zeroing EAX implicitly clears RAX, and the 32-bit form encodes one byte smaller while keeping identical semantics.
Signed-off-by: George Hu <[email protected]> --- grub-core/lib/x86_64/setjmp.S | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/grub-core/lib/x86_64/setjmp.S b/grub-core/lib/x86_64/setjmp.S index 6b151bc4d..4c6c81249 100644 --- a/grub-core/lib/x86_64/setjmp.S +++ b/grub-core/lib/x86_64/setjmp.S @@ -36,7 +36,7 @@ GRUB_MOD_LICENSE "GPLv3+" */ FUNCTION(grub_setjmp) pop %rsi /* Return address, and adjust the stack */ - xorq %rax, %rax + xorl %eax, %eax movq %rbx, 0(%rdi) /* RBX */ movq %rsp, 8(%rdi) /* RSP */ push %rsi -- 2.52.0 _______________________________________________ Grub-devel mailing list [email protected] https://lists.gnu.org/mailman/listinfo/grub-devel
