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Bail out earlier
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21786 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -341,10 +341,6 @@ static Value *NegateValue(Value *V, Instruction *BI) {
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/// only used by an add, transform this into (X+(0-Y)) to promote better
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/// reassociation.
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static Instruction *BreakUpSubtract(Instruction *Sub) {
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// Reject cases where it is pointless to do this.
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if (Sub->getType()->isFloatingPoint())
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return 0; // Floating point adds are not associative.
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// Don't bother to break this up unless either the LHS is an associable add or
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// if this is only used by one.
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if (!isReassociableOp(Sub->getOperand(0), Instruction::Add) &&
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@ -560,6 +556,10 @@ static void PrintOps(unsigned Opcode, const std::vector<ValueEntry> &Ops,
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/// reassociating them as we go.
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void Reassociate::ReassociateBB(BasicBlock *BB) {
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for (BasicBlock::iterator BI = BB->begin(); BI != BB->end(); ++BI) {
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// Reject cases where it is pointless to do this.
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if (!isa<BinaryOperator>(BI) || BI->getType()->isFloatingPoint())
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continue; // Floating point ops are not associative.
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// If this is a subtract instruction which is not already in negate form,
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// see if we can convert it to X+-Y.
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if (BI->getOpcode() == Instruction::Sub) {
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