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Implement mul.ll:test11
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11737 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -616,12 +616,13 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) {
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Value *SCIOp0 = SCI->getOperand(0), *SCIOp1 = SCI->getOperand(1);
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const Type *SCOpTy = SCIOp0->getType();
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// If the source is X < 0, and X is a signed integer type, convert this
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// multiply into a shift/and combination.
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if (SCI->getOpcode() == Instruction::SetLT &&
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isa<Constant>(SCIOp1) && cast<Constant>(SCIOp1)->isNullValue() &&
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SCOpTy->isInteger() && SCOpTy->isSigned()) {
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// If the source is X < 0 or X <= -1, and X is a signed integer type,
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// convert this multiply into a shift/and combination.
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if (SCOpTy->isSigned() && isa<ConstantInt>(SCIOp1) &&
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((SCI->getOpcode() == Instruction::SetLT &&
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cast<Constant>(SCIOp1)->isNullValue()) ||
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(SCI->getOpcode() == Instruction::SetLE &&
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cast<ConstantInt>(SCIOp1)->isAllOnesValue()))) {
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// Shift the X value right to turn it into "all signbits".
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Constant *Amt = ConstantUInt::get(Type::UByteTy,
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SCOpTy->getPrimitiveSize()*8-1);
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