[PATCH] D152529: [NewGVN] Fold equivalent freeze instructions

[Jay Foad via Phabricator via llvm-commits]

foad created this revision.
foad added reviewers: aqjune, fhahn, reames, spatel, efriedma, lebedev.ri, nikic.
Herald added subscribers: kmitropoulou, StephenFan, hiraditya.
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foad requested review of this revision.
Herald added a project: LLVM.
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Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152529

Files:
  llvm/lib/Transforms/Scalar/NewGVN.cpp
  llvm/test/Transforms/NewGVN/freeze.ll


Index: llvm/test/Transforms/NewGVN/freeze.ll
===================================================================
--- llvm/test/Transforms/NewGVN/freeze.ll
+++ llvm/test/Transforms/NewGVN/freeze.ll
@@ -15,10 +15,9 @@
 define void @f_multipleuses(i1 %a) {
 ; CHECK-LABEL: @f_multipleuses(
 ; CHECK-NEXT:    [[B:%.*]] = freeze i1 [[A:%.*]]
-; CHECK-NEXT:    [[C:%.*]] = freeze i1 [[A]]
 ; CHECK-NEXT:    call void @use1(i1 [[B]])
-; CHECK-NEXT:    call void @use1(i1 [[C]])
-; CHECK-NEXT:    call void @use1(i1 [[C]])
+; CHECK-NEXT:    call void @use1(i1 [[B]])
+; CHECK-NEXT:    call void @use1(i1 [[B]])
 ; CHECK-NEXT:    ret void
 ;
   %b = freeze i1 %a
Index: llvm/lib/Transforms/Scalar/NewGVN.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/NewGVN.cpp
+++ llvm/lib/Transforms/Scalar/NewGVN.cpp
@@ -1994,6 +1994,7 @@
       break;
     case Instruction::BitCast:
     case Instruction::AddrSpaceCast:
+    case Instruction::Freeze:
       return createExpression(I);
       break;
     case Instruction::ICmp:


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