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GetElementPtr instructions default to having no overflow. 

llvm-svn: 76222
This commit is contained in:
Dan Gohman 2009-07-17 19:23:21 +00:00
parent 64c6d42a9a
commit 97190a2c93
1 changed files with 9 additions and 0 deletions
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9
llvm/lib/VMCore/Instructions.cpp
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@ -1022,6 +1022,9 @@ void GetElementPtrInst::init(Value *Ptr, Value* const *Idx, unsigned NumIdx,
OL[i+1] = Idx[i]; OL[i+1] = Idx[i];
setName(Name); setName(Name);
// GetElementPtr instructions have undefined results on overflow by default.
setHasNoPointerOverflow(true);
} }
void GetElementPtrInst::init(Value *Ptr, Value *Idx, const std::string &Name) { void GetElementPtrInst::init(Value *Ptr, Value *Idx, const std::string &Name) {
@ -1031,6 +1034,9 @@ void GetElementPtrInst::init(Value *Ptr, Value *Idx, const std::string &Name) {
OL[1] = Idx; OL[1] = Idx;
setName(Name); setName(Name);
// GetElementPtr instructions have undefined results on overflow by default.
setHasNoPointerOverflow(true);
} }
GetElementPtrInst::GetElementPtrInst(const GetElementPtrInst &GEPI) GetElementPtrInst::GetElementPtrInst(const GetElementPtrInst &GEPI)
@ -1042,6 +1048,9 @@ GetElementPtrInst::GetElementPtrInst(const GetElementPtrInst &GEPI)
Use *GEPIOL = GEPI.OperandList; Use *GEPIOL = GEPI.OperandList;
for (unsigned i = 0, E = NumOperands; i != E; ++i) for (unsigned i = 0, E = NumOperands; i != E; ++i)
OL[i] = GEPIOL[i]; OL[i] = GEPIOL[i];
// Transfor the hasNoPointerOverflow() value from the original GEPI.
setHasNoPointerOverflow(GEPI.hasNoPointerOverflow());
} }
GetElementPtrInst::GetElementPtrInst(Value *Ptr, Value *Idx, GetElementPtrInst::GetElementPtrInst(Value *Ptr, Value *Idx,