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Implement constant propogation of shift instructions

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2471 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2002-05-06 03:01:37 +00:00
parent cf4929fa27
commit 4c1061f58c
5 changed files with 108 additions and 7 deletions
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12
lib/Transforms/Scalar/SCCP.cpp
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@@ -502,9 +502,15 @@ void SCCP::visitBinaryOperator(Instruction *I) {
if (V1State.isOverdefined() || V2State.isOverdefined()) {
markOverdefined(I);
} else if (V1State.isConstant() && V2State.isConstant()) {
Constant *Result = ConstantFoldBinaryInstruction(I->getOpcode(),
V1State.getConstant(),
V2State.getConstant());
Constant *Result = 0;
if (isa<BinaryOperator>(I))
Result = ConstantFoldBinaryInstruction(I->getOpcode(),
V1State.getConstant(),
V2State.getConstant());
else if (isa<ShiftInst>(I))
Result = ConstantFoldShiftInstruction(I->getOpcode(),
V1State.getConstant(),
V2State.getConstant());
if (Result)
markConstant(I, Result); // This instruction constant folds!
else