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Don't sink argument loads into loops or other bad places. This disables folding of argument loads with instructions that are not in the entry block.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20228 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -852,7 +852,14 @@ static BasicBlock *IsOnlyUsedInOneBasicBlock(Argument *A) {
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++UI)
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if (isa<PHINode>(*UI) || cast<Instruction>(*UI)->getParent() != BB)
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return 0; // Disagreement among the users?
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return BB;
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// Okay, there is a single BB user. Only permit this optimization if this is
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// the entry block, otherwise, we might sink argument loads into loops and
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// stuff. Later, when we have global instruction selection, this won't be an
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// issue clearly.
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if (BB == BB->getParent()->begin())
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return BB;
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return 0;
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}
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void SelectionDAGISel::
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