llvm-project

91dad7e7 - [X86] canonicalizeLaneShuffleWithRepeatedOps - avoid folding vperm2x128(vpshufd(load()),undef) -> vpshufd(vperm2x128(load(),undef)) (#178675)

[X86] canonicalizeLaneShuffleWithRepeatedOps - avoid folding vperm2x128(vpshufd(load()),undef) -> vpshufd(vperm2x128(load(),undef)) (#178675) There's no benefit to letting vperm2x128 handle the fold in an unary shuffle and llvm-mca assumes there's an extra register dependency, which confuses analysis. Fixes #178632