| Issue |
124099
|
| Summary |
AMDGPU fails to fold out useless half of 64-bit or
|
| Labels |
backend:AMDGPU,
missed-optimization
|
| Assignees |
|
| Reporter |
arsenm
|
In some tests I see this pattern appear:
```
t334: v2i32 = BUILD_VECTOR Constant:i32<0>, t258
t335: i64 = bitcast t334
t188: i64 = or # D:1 t342, t335
```
We should be able to do a 32-bit or and drop the operation on the 0 bits. The same applies for other identity value elements, like -1 with and. This is similar to 09583dec15c5100fd5f26f81a1b011bce3f9b21f, except it's a variable case (and for or, instead of add/sub)
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