[PATCH] D44190: [X86] Make the MUL->VPMADDWD work before op legalization on AVX1 targets. Simplify feature checks by using isTypeLegal.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.

The v8i32 conversion on AVX1 targets was only working after LowerMUL splits 256-bit vectors.

While I was there I've also made it so we don't have to check for AVX2 and BWI directly and instead just ask if the type is legal. I really want to minimize the number of places we have to check useBWIRegs().


Repository:
  rL LLVM

https://reviews.llvm.org/D44190

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/shrink_vmul.ll

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