https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89544
--- Comment #7 from Bernd Edlinger <bernd.edlinger at hotmail dot de> --- However while writing the patch "Sanitizing the middle-end interface to the back-end for strict alignment": https://gcc.gnu.org/ml/gcc-patches/2019-08/msg01130.html I discovered another wrong code bug, this time affecting all arch: $ cat unaligned-argument-3.c /* { dg-do compile } */ /* { dg-require-effective-target arm_arm_ok } */ /* { dg-require-effective-target arm_ldrd_strd_ok } */ /* { dg-options "-marm -mno-unaligned-access -O3" } */ typedef int __attribute__((aligned(1))) s; void x(char*, s*); void f(char a, s f) { x(&a, &f); } /* { dg-final { scan-assembler-times "str\t\[^\\n\]*\\\[sp\\\]" 1 } } */ /* { dg-final { scan-assembler-times "str\t\[^\\n\]*\\\[sp, #3\\\]" 0 } } */ currently with -marm -mno-unaligned-access -O3 we generate: f: @ args = 0, pretend = 0, frame = 8 @ frame_needed = 0, uses_anonymous_args = 0 str lr, [sp, #-4]! sub sp, sp, #12 mov r3, r0 str r1, [sp, #3] add r0, sp, #7 add r1, sp, #3 strb r3, [sp, #7] bl x add sp, sp, #12 @ sp needed ldr pc, [sp], #4
