[PATCH] D45315: [X86] Improve unsigned saturation downconvert detection.

[Artur Gainullin via Phabricator via llvm-commits]

ArturGainullin created this revision.
ArturGainullin added a reviewer: RKSimon.

New unsigned saturation downconvert pattern detection was implemented in
X86 Codegen:

  (truncate (smin (smax (x, C1), C2)) to dest_type)
  where C1 >= 0 and C2 >= 0 and C2 is unsigned max of destination type.

In this case smin is actually umin and this expression is unsigned
saturation of smax (x, C1) value with the following truncation.


Repository:
  rL LLVM

https://reviews.llvm.org/D45315

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/avx512-trunc.ll

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