search for: constantfoldcastinstruct

Hello, It seems that ConstantFoldCastInstruction in ConstantFold.cpp folds inttoptr instruction with 0 as operand to a null pointer. It makes sense, when talking about a C-style frontend, as the C99 spec (6.3.2.3) states: "An integer constant expression with the value 0, or such an expression cast to type void *, is called a null pointer...

...>> >> ret i32 %std_ld.i >> >> } >> >> >> >> The contant folder doesn’t seem to check for address space, it simply >> checks if the integer in question is zero, and folds the inttoptr to null: >> >> >> >> Constant *llvm::ConstantFoldCastInstruction(unsigned opc, Constant *V, >> >> Type *DestTy) { >> >> >> >> ... >> >> >> >> if (V->isNullValue() && !DestTy->isX86_MMXTy()) >> >> return Constant::getNullValue...

...on (early CSE): define i32 @foo() #0 { entry: %std_ld.i = load volatile i32 addrspace(1)* null, align 536870912 ret i32 %std_ld.i } The contant folder doesn’t seem to check for address space, it simply checks if the integer in question is zero, and folds the inttoptr to null: Constant *llvm::ConstantFoldCastInstruction(unsigned opc, Constant *V, Type *DestTy) { ... if (V->isNullValue() && !DestTy->isX86_MMXTy()) return Constant::getNullValue(DestTy); ... Is this a bug? Thanks Guy From: David Majnemer [mailto:david.majnemer at gmail.co...