[WIP][RFC][X86] Remove MOVSS/D -> BLENDPS/D conversions from DAG/ISEL #144338
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RKSimon
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This patch attempts to remove most of the MOVSS/D vs BLENDPS/D OptForSize/OptForSpeed instruction selection as possible and lets later domain switching and X86FixupInstTuning passes handle it. (V)MOVSS/D instructions are created in all cases, which also avoids AVX512 getting stuck with VBLENDPS/D VEC inctructions restricting register usage. getExecutionDomainCustom can now convert MOVSS/D to BLENDW/PS to support domain switches and X86FixupInstTuning can convert VMOVSS/D back to VBLENDPS/D if the scheduler model prefers it (and not building for OptSize). Fixes llvm#142972
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This patch attempts to remove as much of the MOVSS/D vs BLENDPS/D OptForSize/OptForSpeed instruction selection as possible and lets later domain switching and X86FixupInstTuning passes handle it.
(V)MOVSS/D instructions are created in all cases, which also avoids AVX512 getting prematurely stuck with VBLENDPS/D VEX instructions restricting register usage.
getExecutionDomainCustom can now convert MOVSS/D to BLENDW/PS to support domain switches and X86FixupInstTuning can convert VMOVSS/D back to VBLENDPS/D if the scheduler model prefers it (and not building for OptSize).
Fixes #142972