https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101934
Bug ID: 101934
Summary: [11 Regression] aarch64 memset code creates unaligned
stores for -mstrict-align
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rsandifo at gcc dot gnu.org
Target Milestone: ---
For:
struct s { char x[95]; };
void foo (struct s *);
void bar (void) { struct s s1 = {}; foo (&s1); }
compiled with -Os -mstrict-align, GCC produces:
bar:
movi v0.4s, 0
stp x29, x30, [sp, -112]!
mov x29, sp
add x0, sp, 16
str q0, [sp, 80]
stp q0, q0, [sp, 16]
stp q0, q0, [sp, 48]
str q0, [sp, 95] // <-------- unaligned
bl foo
ldp x29, x30, [sp], 112
ret
The *_RATIO macros are already set up to handle STRICT_ALIGNMENT
differently, so presumably we should just make aarch64_expand_setmem
punt in that case.
