tree 3f57a042f0dbe7b341a4ecb47c91e49506c91190
parent b2627851373e7afed1f7b14d7013edf41d20a4f5
author Ricardo Jesus <rjj@nvidia.com> 1745997758 +0100
committer GitHub <noreply@github.com> 1745997758 +0100
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[InstCombine] Do not combine shuffle+bitcast if the bitcast is eliminable. (#135769)

If we are attempting to combine shuffle+bitcast but the bitcast is
pairable with a subsequent bitcast, we should not fold the shuffle as
doing so can block further simplifications.

The motivation for this is a long-standing regression affecting SIMDe on
AArch64, introduced indirectly by the AlwaysInliner (1a2e77cf). Some
reproducers:
* https://godbolt.org/z/53qx18s6M
* https://godbolt.org/z/o5e43h5M7