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Commit eb6a20e7 authored by Craig Topper's avatar Craig Topper
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[X86][InstCombine] Teach SimplifyDemandedVectorElts to handle scalar round... 

[X86][InstCombine] Teach SimplifyDemandedVectorElts to handle scalar round intrinsics more correctly.

Now we only pass bit 0 of the DemandedElts to optimize operand 1 as we recurse since the upper bits are unused. Similarly we clear bit 0 for optimizing operand 0.

Also calculate UndefElts correctly.

Simplify InstCombineCalls for these instrinics to just call SimplifyDemandedVectorElts for the call instrution to reuse this support.

llvm-svn: 289629
parent a0372dec
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