| Issue |
126974
|
| Summary |
[RISC-V] Miscompile using rv64gcv
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
ewlu
|
Testcase:
```c
int a[][21][21];
void b(int c, int d, int e, short f, _Bool g, char h, char i, int j, int k,
int l, unsigned char m, int n, char o, int p, long long q[],
unsigned short r[][10], unsigned s[][10],
unsigned long long t[][10][10][10], unsigned long long u[][10][10][10],
int w[][10][10][10][10], _Bool x) {
for (signed z = 0; z < (char)m + 3; z = 4)
for (short aa = ({
__typeof__(0) ab = 173;
__typeof__(0) ac = ({
__typeof__(0) ab = m;
ab;
});
ab > ac ? ab : ac;
}) -
171;
aa < 9; aa = k)
a[z][aa][aa] = ~0;
}
typedef int ad;
int printf(const char *, ...);
long long ae;
void af(long long *ae, int v) { *ae ^= v; }
int c;
int d;
int e;
short f;
_Bool g;
char h;
char i;
int j;
int k = 2805750831;
int l;
char m;
int n;
char o;
int p;
long long q[0];
unsigned short r[0][10];
unsigned s[0][10];
unsigned long long t[0][10][10][10];
unsigned long long u[0][10][10][10];
int w[0][10][10][10][10];
_Bool x;
int a[21][21][21];
void ag() {
for (ad y = 0; y < 10; ++y)
for (ad ah = 0; ah < 10; ++ah)
for (ad ai = 0; ai < 10; ++ai)
af(&ae, a[y][ah][ai]);
}
int main() {
b(c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, w, x);
ag();
printf("%llu\n", ae);
}
```
Commands:
```
# riscv
$ QEMU_CPU=rv64,vlen=128,rvv_ta_all_1s=true,rvv_ma_all_1s=true,v=true,vext_spec=v1.0,zve32f=true,zve64f=true timeout --verbose -k 0.1 4 /scratch/ewlu/daily-upstream-build/build-gcv/bin/qemu-riscv64 user-config.out 1
0
# x86
$ ./native.out 1
18446744073709551615
```
Godbolt: https://godbolt.org/z/85rz18rxY
Bisected to cfee344dda7394631f2177a15e56cfeee1d61fc4 as the first bad commit
I tried reducing the testcase down farther but was unsuccessful
Found via fuzzer. First detected 01/24/2025
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