Ricardo Jesus c91c3f930c [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

2025-04-30 08:22:38 +01:00

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