https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63668
Bug ID: 63668
Summary: -mstd-struct-return fails for non-leaf functions
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: rth at gcc dot gnu.org
With optimization, the return address adjustment that's
applied for -mstd-struct-return is deleted as dead code,
resulting in a return directly to the unimp insn.
struct S { int x, y, z; };
void bar(void);
struct S foo(void)
{
struct S s = { 1, 2, 3 };
bar();
return s;
}
-O0:
save %sp, -128, %sp
ld [%i7+8], %g1
add %i7, 4, %i7
cmp %g1, 12
be .L2
nop
sub %i7, 4, %i7
add %fp, -20, %g1
st %g1, [%fp+64]
.L2:
-O2:
foo:
save %sp, -112, %sp
ld [%i7+8], %g1
cmp %g1, 12
be .L2
add %fp, -4, %g1
st %g1, [%fp+64]
.L2:
