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Do not hoist instruction above branch condition. The instruction may use branch condition.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56286 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1046,15 +1046,8 @@ static bool SpeculativelyExecuteBB(BranchInst *BI, BasicBlock *BB1) {
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return false;
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}
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// If we get here, we can hoist the instruction. Try to place it before the
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// icmp instruction preceeding the conditional branch.
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BasicBlock::iterator InsertPos = BI;
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if (InsertPos != BIParent->begin())
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--InsertPos;
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if (InsertPos == BrCond && !isa<PHINode>(BrCond))
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BIParent->getInstList().splice(InsertPos, BB1->getInstList(), I);
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else
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BIParent->getInstList().splice(BI, BB1->getInstList(), I);
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// If we get here, we can hoist the instruction.
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BIParent->getInstList().splice(BI, BB1->getInstList(), I);
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// Create a select whose true value is the speculatively executed value and
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// false value is the previously determined FalseV.
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18
test/Transforms/SimplifyCFG/2008-09-17-SpeculativeHoist.ll
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18
test/Transforms/SimplifyCFG/2008-09-17-SpeculativeHoist.ll
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@ -0,0 +1,18 @@
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; RUN: llvm-as < %s | opt -simplifycfg -disable-output
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; PR 2800
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define void @foo() {
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start:
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%tmp = call i1 @bar( ) ; <i1> [#uses=4]
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br i1 %tmp, label %brtrue, label %brfalse
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brtrue: ; preds = %start
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%tmpnew = and i1 %tmp, %tmp ; <i1> [#uses=1]
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br label %brfalse
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brfalse: ; preds = %brtrue, %start
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%andandtmp.0 = phi i1 [ %tmp, %start ], [ %tmpnew, %brtrue ] ; <i1> [#uses=0]
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ret void
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}
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declare i1 @bar()
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