| /* PR middle-end/92312 - bogus -Wstringop-overflow storing into a trailing |
| array backed by larger buffer |
| { dg-do compile } |
| { dg-options "-O2 -Wall -Wno-array-bounds" } */ |
| |
| struct S0 { char a, b[0]; }; |
| |
| void sink (void*); |
| |
| void test_memset_zero_length (void) |
| { |
| char a[3]; |
| struct S0 *p = (struct S0*)a; |
| p->a = 0; |
| __builtin_memset (p->b, 0, 2); |
| sink (p); |
| |
| __builtin_memset (p->b, 0, 3); // { dg-warning "\\\[-Wstringop-overflow" } |
| sink (p); |
| } |
| |
| void test_store_zero_length (int i) |
| { |
| char a[3]; |
| struct S0 *p = (struct S0*)a; |
| p->a = 0; // { dg-warning "\\\[-Wstringop-overflow" "pr102706" { target { vect_slp_v4qi_store_align } } } |
| p->b[0] = 0; |
| p->b[1] = 1; // { dg-bogus "\\\[-Wstringop-overflow" } |
| p->b[2] = 2; // { dg-warning "\\\[-Wstringop-overflow" "pr102706" { xfail { vect_slp_v4qi_store_align } } } |
| p->b[i] = 2; |
| sink (p); |
| } |
| |
| |
| struct Sx { char a, b[]; }; |
| |
| void test_memset_flexarray (int i) |
| { |
| char a[3]; |
| struct Sx *p = (struct Sx*)a; |
| p->a = 0; |
| __builtin_memset (p->b, 0, 2); |
| sink (p); |
| |
| __builtin_memset (p->b, 0, 3); // { dg-warning "\\\[-Wstringop-overflow" } |
| sink (p); |
| } |
| |
| void test_store_flexarray (int i) |
| { |
| char a[3]; |
| struct Sx *p = (struct Sx*)a; |
| p->a = 0; // { dg-warning "\\\[-Wstringop-overflow" "pr102706" { target { vect_slp_v4qi_store_align } } } |
| p->b[0] = 0; |
| p->b[1] = 1; // { dg-bogus "\\\[-Wstringop-overflow" } |
| p->b[2] = 1; // { dg-warning "\\\[-Wstringop-overflow" "pr102706" { xfail { vect_slp_v4qi_store_align } } } |
| p->b[i] = 2; |
| sink (p); |
| } |