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

[Jay Foad via Phabricator via llvm-commits]

foad updated this revision to Diff 529967.
foad added a comment.

Rebase on fixed test case.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D152529/new/

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
@@ -4,9 +4,7 @@
 define i1 @f(i1 %a) {
 ; CHECK-LABEL: @f(
 ; CHECK-NEXT:    [[B:%.*]] = freeze i1 [[A:%.*]]
-; CHECK-NEXT:    [[C:%.*]] = freeze i1 [[A]]
-; CHECK-NEXT:    [[D:%.*]] = and i1 [[B]], [[C]]
-; CHECK-NEXT:    ret i1 [[D]]
+; CHECK-NEXT:    ret i1 [[B]]
 ;
   %b = freeze i1 %a
   %c = freeze i1 %a
@@ -17,10 +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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