llvm-project

83586be2 - [X86] Ensure a (vXi1 bitcast(iX Mask)) memory mask is canonicalised for extension before it might get split by legalisation (#175769)

[X86] Ensure a (vXi1 bitcast(iX Mask)) memory mask is canonicalised for extension before it might get split by legalisation (#175769) Masked load/store/gathers often need to bitcast the mask from a bitcasted integer. On pre-AVX512 targets this can lead to some rather nasty scalarization if we don't custom expand the mask first. This patch uses the canonicalizeBoolMask /combineToExtendBoolVectorInReg helper functions to canonicalise the masks, similar to what we already do for vselect expansion. Alternative to #175385 Fixes #59789