Type *IntIdxTy = DL.getIndexType(Ptr->getType());
- // If this is a constant expr gep that is effectively computing an
- // "offsetof", fold it into 'cast int Size to T*' instead of 'gep 0, 0, 12'
+ // If this is "gep i8* Ptr, (sub 0, V)", fold this as:
+ // "inttoptr (sub (ptrtoint Ptr), V)"
+ if (Ops.size() == 2 && ResElemTy->isIntegerTy(8)) {
+ auto *CE = dyn_cast<ConstantExpr>(Ops[1]);
+ assert((!CE || CE->getType() == IntIdxTy) &&
+ "CastGEPIndices didn't canonicalize index types!");
+ if (CE && CE->getOpcode() == Instruction::Sub &&
+ CE->getOperand(0)->isNullValue()) {
+ Constant *Res = ConstantExpr::getPtrToInt(Ptr, CE->getType());
+ Res = ConstantExpr::getSub(Res, CE->getOperand(1));
+ Res = ConstantExpr::getIntToPtr(Res, ResTy);
+ return ConstantFoldConstant(Res, DL, TLI);
+ }
+ }
+
for (unsigned i = 1, e = Ops.size(); i != e; ++i)
- if (!isa<ConstantInt>(Ops[i])) {
-
- // If this is "gep i8* Ptr, (sub 0, V)", fold this as:
- // "inttoptr (sub (ptrtoint Ptr), V)"
- if (Ops.size() == 2 && ResElemTy->isIntegerTy(8)) {
- auto *CE = dyn_cast<ConstantExpr>(Ops[1]);
- assert((!CE || CE->getType() == IntIdxTy) &&
- "CastGEPIndices didn't canonicalize index types!");
- if (CE && CE->getOpcode() == Instruction::Sub &&
- CE->getOperand(0)->isNullValue()) {
- Constant *Res = ConstantExpr::getPtrToInt(Ptr, CE->getType());
- Res = ConstantExpr::getSub(Res, CE->getOperand(1));
- Res = ConstantExpr::getIntToPtr(Res, ResTy);
- return ConstantFoldConstant(Res, DL, TLI);
- }
- }
- return nullptr;
- }
+ if (!isa<ConstantInt>(Ops[i]))
+ return nullptr;
unsigned BitWidth = DL.getTypeSizeInBits(IntIdxTy);
APInt Offset =