commit | 5d1029b4a87f36a394c169b89b26a74d17f7ff01 | [log] [tgz] |
---|---|---|
author | hanbeom <kese111@gmail.com> | Thu Mar 06 21:43:47 2025 +0900 |
committer | GitHub <noreply@github.com> | Thu Mar 06 12:43:47 2025 +0000 |
tree | 8ac11cd6e63d41681b5c99e0f4f01f40050a26d2 | |
parent | 8c61ef17c3aefd13eaf75f401aa8f3c7dd5d4a12 [diff] |
[VectorCombine] Handle shuffle of selects (#128032) (shuffle(select(c1,t1,f1)), (select(c2,t2,f2)), m) -> (select (shuffle c1,c2,m), (shuffle t1,t2,m), (shuffle f1,f2,m)) The behaviour of SelectInst on vectors is the same as for `V'select[i] = Condition[i] ? V'True[i] : V'False[i]`. If a ShuffleVector is performed on two selects, it will be like: `V'[mask] = (V'select[i] = Condition[i] ? V'True[i] : V'False[i])` That's why a ShuffleVector with two SelectInst is equivalent to first ShuffleVector Condition/True/False and then SelectInst that result. This patch implements the transforming described above. Proof: https://alive2.llvm.org/ce/z/97wfHp Fixes #120775
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