https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57971
Eelis <gcc-bugzilla at contacts dot eelis.net> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |gcc-bugzilla at contacts dot
eelis
| |.net
--- Comment #1 from Eelis <gcc-bugzilla at contacts dot eelis.net> ---
struct foo { foo(); foo(foo const &); };
foo bar();
foo fast(bool b) {
if (b) return foo();
return bar();
}
/* produces (with -O3):
_Z4fastb:
.LFB0:
testb %sil, %sil
pushq %rbx
movq %rdi, %rbx
jne .L6
call _Z3barv
movq %rbx, %rax
popq %rbx
ret
.p2align 4,,10
.p2align 3
.L6:
call _ZN3fooC1Ev
movq %rbx, %rax
popq %rbx
ret
*/
foo slow(bool b) {
if (b) return foo();
foo f = bar();
return f;
}
/* produces (with -O3):
_Z4slowb:
.LFB1:
pushq %rbx
movq %rdi, %rbx
subq $16, %rsp
testb %sil, %sil
jne .L11
leaq 15(%rsp), %rdi
call _Z3barv
leaq 15(%rsp), %rsi
movq %rbx, %rdi
call _ZN3fooC1ERKS_
addq $16, %rsp
movq %rbx, %rax
popq %rbx
ret
.p2align 4,,10
.p2align 3
.L11:
call _ZN3fooC1Ev
addq $16, %rsp
movq %rbx, %rax
popq %rbx
ret
*/
