[PATCH] D55855: [X86][SSE] Auto upgrade PADDUS/PSUBUS intrinsics to UADD_SAT/USUB_SAT generic intrinsics

[Simon Pilgrim via Phabricator via llvm-commits]

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

Now that we use the generic ISD opcodes, we can use the generic intrinsics directly as well. This fixes the poor fast-isel codegen by not expanding to an easily broken IR code sequence.

I have a sibling clang patch in progress that I will push for review in due time.

I'm also intending to deal with the signed saturation equivalents as well.


Repository:
  rL LLVM

https://reviews.llvm.org/D55855

Files:
  lib/IR/AutoUpgrade.cpp
  test/CodeGen/X86/avx2-intrinsics-fast-isel.ll
  test/CodeGen/X86/avx512bw-intrinsics-canonical.ll
  test/CodeGen/X86/avx512bwvl-intrinsics-canonical.ll
  test/CodeGen/X86/sse2-intrinsics-fast-isel.ll

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