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Teach the PruningFunctionCloner how to look through loads with

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ConstantExpression GEPs pointing into constant globals.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50256 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman 2008-04-25 06:37:06 +00:00
parent 25453ea49e
commit 4be30ac0e2
1 changed files with 12 additions and 4 deletions
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16
lib/Transforms/Utils/CloneFunction.cpp
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@ -17,6 +17,7 @@
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/GlobalVariable.h"
#include "llvm/Function.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Compiler.h"
@ -308,13 +309,20 @@ ConstantFoldMappedInstruction(const Instruction *I) {
else
return 0; // All operands not constant!
if (const CmpInst *CI = dyn_cast<CmpInst>(I))
return ConstantFoldCompareInstOperands(CI->getPredicate(),
&Ops[0], Ops.size(), TD);
else
return ConstantFoldInstOperands(I->getOpcode(), I->getType(),
&Ops[0], Ops.size(), TD);
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0]))
if (const LoadInst *LI = dyn_cast<LoadInst>(I))
if (!LI->isVolatile() && CE->getOpcode() == Instruction::GetElementPtr)
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
if (GV->isConstant() && !GV->isDeclaration())
return ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(),
CE);
return ConstantFoldInstOperands(I->getOpcode(), I->getType(), &Ops[0],
Ops.size(), TD);
}
/// CloneAndPruneFunctionInto - This works exactly like CloneFunctionInto,