[all-commits] [llvm/llvm-project] 5d3930: [DAG] visitTRUNCATE - attempt to truncate USUBSAT

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5d3930bb8feb2c0c6abc1a6ea73a8fbf00c8bfb9
      https://github.com/llvm/llvm-project/commit/5d3930bb8feb2c0c6abc1a6ea73a8fbf00c8bfb9
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2021-02-19 (Fri, 19 Feb 2021)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/test/CodeGen/X86/combine-sub-usat.ll

  Log Message:
  -----------
  [DAG] visitTRUNCATE - attempt to truncate USUBSAT

Fold trunc(usubsat(zext(x),y)) -> usubsat(x,trunc(umin(y,satlimit)))