| Issue |
204549
|
| Summary |
Wrong code at -O1/2/3 on x86_64-linux-gnu
|
| Labels |
miscompilation,
llvm:optimizations,
generated by fuzzer
|
| Assignees |
|
| Reporter |
XChy
|
Reproducer: https://godbolt.org/z/98M7cdzaT
Testcase:
```c
#include <stdint.h>
#include <stdio.h>
typedef int8_t v8i8 __attribute__((vector_size(8)));
v8i8 g6;
void *g18;
uint64_t __chk;
int main()
{
g6 = 0 >= g6;
int8_t v5 = 0;
lbl_cont3:
g6 = __builtin_shufflevector(g6, g6, 9, 4, 2, 6, 3, 0, 9, 7);
if (g18) g6 = g6 * g6;
v5 = v5 + 4;
switch (v5)
{
case 16: goto lbl_sw17;
default: goto lbl_cont3;
}
lbl_sw17:
__chk = g6[5];
printf("checksum=0x%016llx\n", (unsigned long long)__chk);
}
```
This case outputs `checksum=0x0000000000000000` at -O0, and outputs `checksum=0xffffffffffffffff` at -O1/2/3.
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