Jasmine Tang 7fcee5fe08
[WebAssembly] Add support for avgr_u in loops (#153252)
Fixes https://github.com/llvm/llvm-project/issues/150550.

With the test case 
```
void f(unsigned char *x, unsigned char *y, int n) {
  // should have been vectorized into avgr_u instead of seperated vectorized add and logical right shift
  for (int i = 0; i < n; i++)
    x[i] = (x[i] + y[i] + 1) / 2;
}
```

the backend failed to recognize that this can be reduced to avgr_u since
the loop vectorizer doesn't transform into the existing pattern in
tablegen.

This PR sets AVGCEIL_U as legal for v8i16 and v16i8 and selects it to
avgr_u in the tablegen file.
2025-08-22 09:52:49 -07:00
..
2023-01-26 10:26:24 +00:00
2023-01-26 10:26:24 +00:00