SuccessChanges

Summary

  1. [AVX512] Correct isExtractSubvectorCheap so that it will return the correct answers for extracting 128-bits from a 512-bit vector and for mask registers. Previously it would not return true for extracting either of the upper quarters of a 512-bit registers. For mask registers we support extracting anything from index 0. And otherwise we only support extracting the upper half of a register. Differential Revision: https://reviews.llvm.org/D36638
Revision 310794 by ctopper:
[AVX512] Correct isExtractSubvectorCheap so that it will return the correct answers for extracting 128-bits from a 512-bit vector and for mask registers.

Previously it would not return true for extracting either of the upper quarters of a 512-bit registers.

For mask registers we support extracting anything from index 0. And otherwise we only support extracting the upper half of a register.

Differential Revision: https://reviews.llvm.org/D36638
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The file was modified/llvm/trunk/lib/Target/X86/X86ISelLowering.cppllvm.src/lib/Target/X86/X86ISelLowering.cpp