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Update the branch weight metadata when reversing the order of a branch.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147280 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1603,10 +1603,7 @@ bool llvm::FoldBranchToCommonDest(BranchInst *BI) {
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}
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PBI->setCondition(NewCond);
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BasicBlock *OldTrue = PBI->getSuccessor(0);
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BasicBlock *OldFalse = PBI->getSuccessor(1);
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PBI->setSuccessor(0, OldFalse);
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PBI->setSuccessor(1, OldTrue);
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PBI->swapSuccessors();
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}
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// If we have a bonus inst, clone it into the predecessor block.
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26
test/Transforms/SimplifyCFG/preserve-branchweights.ll
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26
test/Transforms/SimplifyCFG/preserve-branchweights.ll
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@ -0,0 +1,26 @@
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; RUN: opt -simplifycfg -S -o - < %s | FileCheck %s
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declare void @helper(i32)
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define void @test1(i1 %a, i1 %b) {
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; CHECK @test1
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entry:
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br i1 %a, label %Y, label %X, !prof !0
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; CHECK: br i1 %or.cond, label %Z, label %Y, !prof !0
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X:
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%c = or i1 %b, false
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br i1 %c, label %Z, label %Y
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Y:
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call void @helper(i32 0)
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ret void
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Z:
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call void @helper(i32 1)
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ret void
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}
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!0 = metadata !{metadata !"branch_weights", i32 1, i32 2}
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; CHECK: !0 = metadata !{metadata !"branch_weights", i32 2, i32 1}
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