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Fix constant folding to ALWAYS work. 

llvm-svn: 6355
This commit is contained in:
Chris Lattner 2003-05-27 19:16:07 +00:00
parent e320c9215d
commit 8acf346e20
1 changed files with 9 additions and 19 deletions
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28
llvm/lib/VMCore/ConstantHandling.cpp
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@ -6,6 +6,7 @@
#include "llvm/ConstantHandling.h"
#include "llvm/iPHINode.h"
#include "llvm/InstrTypes.h"
#include "llvm/DerivedTypes.h"
#include <cmath>
@ -45,26 +46,15 @@ Constant *ConstantFoldInstruction(Instruction *I) {
}
}
if (isa<BinaryOperator>(I))
return ConstantExpr::get(I->getOpcode(), Op0, Op1);
switch (I->getOpcode()) {
case Instruction::Cast:
return ConstRules::get(*Op0, *Op0)->castTo(Op0, I->getType());
case Instruction::Add: return *Op0 + *Op1;
case Instruction::Sub: return *Op0 - *Op1;
case Instruction::Mul: return *Op0 * *Op1;
case Instruction::Div: return *Op0 / *Op1;
case Instruction::Rem: return *Op0 % *Op1;
case Instruction::And: return *Op0 & *Op1;
case Instruction::Or: return *Op0 | *Op1;
case Instruction::Xor: return *Op0 ^ *Op1;
case Instruction::SetEQ: return *Op0 == *Op1;
case Instruction::SetNE: return *Op0 != *Op1;
case Instruction::SetLE: return *Op0 <= *Op1;
case Instruction::SetGE: return *Op0 >= *Op1;
case Instruction::SetLT: return *Op0 < *Op1;
case Instruction::SetGT: return *Op0 > *Op1;
case Instruction::Shl: return *Op0 << *Op1;
case Instruction::Shr: return *Op0 >> *Op1;
return ConstantExpr::getCast(Op0, I->getType());
case Instruction::Shl:
case Instruction::Shr:
return ConstantExpr::getShift(I->getOpcode(), Op0, Op1);
case Instruction::GetElementPtr: {
std::vector<Constant*> IdxList;
IdxList.reserve(I->getNumOperands()-1);
@ -74,7 +64,7 @@ Constant *ConstantFoldInstruction(Instruction *I) {
IdxList.push_back(C);
else
return 0; // Non-constant operand
return ConstantFoldGetElementPtr(Op0, IdxList);
return ConstantExpr::getGetElementPtr(Op0, IdxList);
}
default:
return 0;