| Issue |
84350
|
| Summary |
[RISC-V] Miscompile at -O2
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
patrick-rivos
|
Testcase:
```c
int printf(const char *, ...);
long a;
short b = 2;
char c(unsigned char d, unsigned char e) { return e == 0 ?: d % e; }
int main() {
char f;
a = 1;
f = c(0 <= 7, b);
a ^= f;
printf("%lX\n", a);
}
```
Commands:
```bash
> /scratch/tc-testing/tc-mar-5-llvm-slp-ice-2/build/bin/clang -O2 red.c -o red.out
> /scratch/tc-testing/tc-mar-4-llvm/build/bin/qemu-riscv64 red.out
FFFFFFFFFFFFFFFE
> /scratch/tc-testing/tc-mar-5-llvm-slp-ice-2/build/bin/clang red.c -o red.out
> /scratch/tc-testing/tc-mar-4-llvm/build/bin/qemu-riscv64 red.out
0
```
`-opt-bisect-limit` points to `Type Promotion on function (main)`
This is a recent regression.
Known good hash: 083d8aa03aca55b88098a91e41e41a8e321a5721
Known bad hash: 8f79cdd8da97c131ae7d8a3210bb69cb6654903d
Found via fuzzer
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