[LLVMdev] GEP vs IntToPtr/PtrToInt
eli.friedman at gmail.com
Mon Apr 4 17:45:21 PDT 2011
On Mon, Apr 4, 2011 at 5:02 PM, Arushi Aggarwal <arushi987 at gmail.com> wrote:
>> Is it correct to convert,
>> %196 = load i32* %195, align 8 ; <i32> [#uses=1]
>> %197 = zext i32 %196 to i64 ; <i64> [#uses=1]
>> %198 = ptrtoint i8* %193 to i64 ; <i64> [#uses=1]
>> %199 = add i64 %198, %197 ; <i64> [#uses=1]
>> %200 = inttoptr i64 %199 to i8* ; <i8*> [#uses=1]
>> %200 = getelementptr %193, %196
>> Reducing the unnecessary casts of converting to integers and then back?
See http://llvm.org/docs/LangRef.html#pointeraliasing ; it's not
correct in general. It is correct if %196 isn't dependent on the
address of any memory object, though.
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