| Issue |
166666
|
| Summary |
missed optimization: llvm fails to vectorize when dealing with bools
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
alex
|
https://godbolt.org/z/zz8xGqbY7
```c
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
// Count how many bools are true
size_t count_true(const bool *values, size_t len) {
size_t count = 0;
for (size_t i = 0; i < len; i++) {
if (values[i]) {
count++;
}
}
return count;
}
// Count how many uint8_t values are non-zero
size_t count_nonzero_u8(const uint8_t *values, size_t len) {
size_t count = 0;
for (size_t i = 0; i < len; i++) {
if (values[i] != 0) {
count++;
}
}
return count;
}
```
`count_true` should vectorize just as easily as `count_nonzero_u8`, except it doesn't :-)
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