| Issue |
158474
|
| Summary |
[MIPS] Wrong code at O1 in trunk
|
| Labels |
backend:MIPS,
miscompilation
|
| Assignees |
|
| Reporter |
XChy
|
C Testcase:
```c
#include <stdint.h>
#include <stdio.h>
#define BS_VEC(type, num) type __attribute__((vector_size(num * sizeof(type))))
typedef int32_t int32;
typedef int64_t int64;
typedef uint64_t uint64;
uint64 BS_CHECKSUM;
int32_t g_25;
uint32_t func_55(uint8_t p_58) {
BS_VEC(int64, 4) BS_VAR_2 = {};
BS_VEC(int32, 32) BS_VAR_4;
BS_VEC(int64, 8) BS_VAR_8;
uint64 *LOCAL_CHECKSUM = &BS_CHECKSUM;
for (; p_58 <= 7; ++p_58) {
*LOCAL_CHECKSUM ^= BS_VAR_2[3] + *LOCAL_CHECKSUM;
BS_VAR_2 = __builtin_shufflevector(
__builtin_shufflevector(
(BS_VEC(int64, 2)){},
(BS_VEC(int64, 2)){0, BS_VAR_8[4]}, 1, 3, 0, 3, 3, 0, 2, 3),
(BS_VEC(int64, 8)) __builtin_convertvector(
__builtin_shufflevector(BS_VAR_4, BS_VAR_4, 8, 9, 1, 6, 0, 3, 8, 4),
BS_VEC(uint64, 8)),
5, 6, 4, 1);
}
}
int main() {
func_55(g_25);
printf("0x%016llx\n", BS_CHECKSUM);
}
```
Compile with -O1 and run on qemu-mips64el:
```
0x000000000000007b
```
Compile with -O0/O2/O3 and run on qemu-mips64el:
```
0x0000000000000000
```
Maybe related to https://github.com/llvm/llvm-project/issues/157521
clang -v: `clang version 22.0.0git (g...@github.com:llvm/llvm-project.git 0c3cf200f5b918fb5c1114e9f1764c2d54d1779b)`
Let me know if you need a reduced LLVM-IR testcase.
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