[PATCH] D92183: [DAG] Legalize umin(x,y) -> sub(x,usubsat(x,y)) and umax(x,y) -> add(x,usubsat(y,x)) iff usubsat is legal

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, spatel, dmgreen, t.p.northover, lebedev.ri.
Herald added subscribers: pengfei, hiraditya.
Herald added a project: LLVM.
RKSimon requested review of this revision.

If usubsat() is legal, this is likely to result in smaller codegen expansion than the default cmp+select codegen expansion.

Allows us to move the x86-specific lowering to the generic expansion code.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D92183

Files:
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/lib/Target/AArch64/AArch64TargetTransformInfo.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/Analysis/CostModel/AArch64/min-max.ll
  llvm/test/CodeGen/X86/midpoint-int-vec-128.ll

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