[all-commits] [llvm/llvm-project] 1ac99b: [InstSimplify] Simplify select i1 ConstExpr, i1 tr...

luxufan via All-commits all-commits at lists.llvm.org
Sat Jun 3 00:09:59 PDT 2023

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1ac99bc452a863713d404724fb1e10f45ba8b454
  Author: luxufan <luxufan at iscas.ac.cn>
  Date:   2023-06-03 (Sat, 03 Jun 2023)

  Changed paths:
    M llvm/lib/Analysis/InstructionSimplify.cpp
    M llvm/test/Transforms/InstSimplify/select-inseltpoison.ll
    M llvm/test/Transforms/InstSimplify/select.ll

  Log Message:
  [InstSimplify] Simplify select i1 ConstExpr, i1 true, i1 false to ConstExpr

`select i1 non-const, i1 true, i1 false` has been optimized to
`non-const`. There is no reason that we can not optimize `select i1
ConstExpr, i1 true, i1 false` to `ConstExpr`.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D151631

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