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Implement InstCombine/add.ll:test28, transforming C1-(X+C2) --> (C1-C2)-X.
This occurs several dozen times in specint2k, particularly in crafty and gcc apparently. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21136 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -795,10 +795,16 @@ Instruction *InstCombiner::visitSub(BinaryOperator &I) {
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if (BinaryOperator *Op1I = dyn_cast<BinaryOperator>(Op1)) {
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if (Op1I->getOpcode() == Instruction::Add &&
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!Op0->getType()->isFloatingPoint()) {
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if (Op1I->getOperand(0) == Op0) // X-(X+Y) == -Y
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if (Op1I->getOperand(0) == Op0) // X-(X+Y) == -Y
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return BinaryOperator::createNeg(Op1I->getOperand(1), I.getName());
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else if (Op1I->getOperand(1) == Op0) // X-(Y+X) == -Y
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else if (Op1I->getOperand(1) == Op0) // X-(Y+X) == -Y
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return BinaryOperator::createNeg(Op1I->getOperand(0), I.getName());
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else if (ConstantInt *CI1 = dyn_cast<ConstantInt>(I.getOperand(0))) {
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if (ConstantInt *CI2 = dyn_cast<ConstantInt>(Op1I->getOperand(1)))
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// C1-(X+C2) --> (C1-C2)-X
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return BinaryOperator::createSub(ConstantExpr::getSub(CI1, CI2),
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Op1I->getOperand(0));
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}
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}
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if (Op1I->hasOneUse()) {
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