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Be more careful when inserting reused instructions. This fixes CodeGen/Generic/2007-04-17-lsr-crash.ll
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36231 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -71,15 +71,20 @@ Value *SCEVExpander::InsertCastOfTo(Instruction::CastOps opcode, Value *V,
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/// InsertBinop - Insert the specified binary operator, doing a small amount
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/// of work to avoid inserting an obviously redundant operation.
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Value *SCEVExpander::InsertBinop(Instruction::BinaryOps Opcode, Value *LHS,
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Value *RHS, Instruction *InsertPt) {
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Value *RHS, Instruction *&InsertPt) {
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// Do a quick scan to see if we have this binop nearby. If so, reuse it.
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unsigned ScanLimit = 6;
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for (BasicBlock::iterator IP = InsertPt, E = InsertPt->getParent()->begin();
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ScanLimit; --IP, --ScanLimit) {
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if (BinaryOperator *BinOp = dyn_cast<BinaryOperator>(IP))
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if (BinOp->getOpcode() == Opcode && BinOp->getOperand(0) == LHS &&
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BinOp->getOperand(1) == RHS)
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BinOp->getOperand(1) == RHS) {
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// If we found the instruction *at* the insert point, insert later
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// instructions after it.
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if (BinOp == InsertPt)
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InsertPt = ++IP;
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return BinOp;
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}
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if (IP == E) break;
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}
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