[LLVMbugs] [Bug 2781] can't add 8 to a void * pointer

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2781


Bill Wendling <wendling at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |wendling at apple.com
             Status|NEW                         |RESOLVED
         Resolution|                            |WORKSFORME




--- Comment #4 from Bill Wendling <wendling at apple.com>  2008-09-09 12:57:49 ---
(In reply to comment #3)
> Yes. This was reduced from a more complicated example which, given an arbitrary
> pointer p, did something like:
> 
>   printf("%p %p\n", p, f(p));
> 
> and the numbers printed differed by 1, not by 8.
> 
When I compile this code:

#include <stdio.h>

void *f(void *p) __attribute__((noinline));
void *f(void *p) {
  return (void*)((int)p + 8);
}

int main(int argc, char **argv) {
  printf("%p %p\n", argv, f(argv));
}

I get this:

define i8* @f(i8* %p) nounwind notes(inline=never) {
entry:
        %0 = getelementptr i8* %p, i32 8                ; <i8*> [#uses=1]
        ret i8* %0
}

define i32 @main(i32 %argc, i8** %argv) nounwind {
...
}

with top of tree. Please use top-of-tree.


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