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Implement a new method

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16927 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-12 04:20:25 +00:00
parent 673e02b0c3
commit 4ec82eb1de
1 changed files with 27 additions and 3 deletions
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30
lib/VMCore/Function.cpp
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@ -13,10 +13,8 @@
//===----------------------------------------------------------------------===//
#include "llvm/Module.h"
#include "llvm/Constant.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
#include "llvm/IntrinsicInst.h"
#include "llvm/Support/LeakDetector.h"
#include "SymbolTableListTraitsImpl.h"
using namespace llvm;
@ -265,5 +263,31 @@ unsigned Function::getIntrinsicID() const {
return 0;
}
Value *MemIntrinsic::StripPointerCasts(Value *Ptr) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr)) {
if (CE->getOpcode() == Instruction::Cast) {
if (isa<PointerType>(CE->getOperand(0)->getType()))
return StripPointerCasts(CE->getOperand(0));
} else if (CE->getOpcode() == Instruction::GetElementPtr) {
for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
if (!CE->getOperand(i)->isNullValue())
return Ptr;
return StripPointerCasts(CE->getOperand(0));
}
return Ptr;
}
if (CastInst *CI = dyn_cast<CastInst>(Ptr)) {
if (isa<PointerType>(CI->getOperand(0)->getType()))
return StripPointerCasts(CI->getOperand(0));
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr)) {
for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
if (!isa<Constant>(CE->getOperand(i)) ||
!cast<Constant>(CE->getOperand(i))->isNullValue())
return Ptr;
return StripPointerCasts(CE->getOperand(0));
}
return Ptr;
}
// vim: sw=2 ai