| Issue |
160792
|
| Summary |
Assertion "Request for a fixed element count on a scalable object" failed, vectorizer crashing with -Rpass=loop-vectorize
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
namikukr-qc
|
Ran into a crash recently with the vectorizer while trying to build something. Note that this crash only happens if -Rpass=loop-vectorize is enabled.
Reproducer: https://godbolt.org/z/Ms47v6Eea
Note: using the x86 trunk for the assertions build since there doesn't seem to one for armv8-a.
Can't seem to reproduce it while giving the resulting IR into llc to produce assembly.
Seems to be associated with commit #1858532 (tag: @fhahn ).
Source C code used to produce the issue:
```
void foo(int *a, int *b, int *c) {
int i;
int temp;
int *ptr = a;
long qval;
for (i = 0; i < 64; i++) {
qval = b[i];
temp = c[i];
if (temp < 0) {
temp += qval >> 1;
temp /= qval;
}
ptr[i] = temp;
}
}
int main(int argc, char **argv) {
int a[] = {5, 3, 4, 5, 6, 7, 6};
int b[] = {0, 1, 2, 3, 4, 5, 6};
int c[] = {1, 2, 3, 4, 5, 6, 7};
foo(a, b, c);
return 0;
}
```
`clang -march=armv8-a+sve -O3 -Rpass=loop-vectorize test.c -o test.s`
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