| Issue |
204537
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| Summary |
[Analysis] Strength reduction for `@llvm.pext` and `@llvm.pdep` to AND
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| Labels |
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| Assignees |
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| Reporter |
eisenwave
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When `@llvm.pext` and `@llvm.pdep` are given a single contiguous blocks of `1`-bits starting at the least significant bit, followed by zeros, I believe it is strictly better to transforms this into a bitwise AND. That is:
- `pext(x, 0xFF) -> x & 0xFF`
- `pdep(x, 0xFF) -> x & 0xFF`
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