https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87053
Bug ID: 87053
Summary: wrong code with c_strlen
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: bernd.edlinger at hotmail dot de
Target Milestone: ---
$ cat u.c
const union
{ struct {
char x[4];
char y[4];
};
struct {
char z[8];
};
} u = {{"1234", "567"}};
int test()
{
return __builtin_strlen(u.z);
}
$ gcc -S u.c
$
cat u.s
.file "u.c"
.text
.globl u
.section .rodata
.align 8
.type u, @object
.size u, 8
u:
.ascii "1234"
.string "567"
.text
.globl test
.type test, @function
test:
.LFB0:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq %rsp, %rbp
.cfi_def_cfa_register 6
movl $4, %eax
popq %rbp
.cfi_def_cfa 7, 8
ret
.cfi_endproc
.LFE0:
.size test, .-test
.ident "GCC: (GNU) 9.0.0 20180821 (experimental)"
.section .note.GNU-stack,"",@progbits
which Looks wrong.
expected: not folded, or evaluate to 7.
