[LLVMbugs] [Bug 4380] __builtin_object_size

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Jun 23 14:37:19 PDT 2009


Dale Johannesen <dalej at apple.com> changed:

           What    |Removed                     |Added
                 CC|                            |dalej at apple.com
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #2 from Dale Johannesen <dalej at apple.com>  2009-06-23 16:37:19 ---
Actually, it is lowered to -1, and then the memcpy_chk expansion decides it is
OK to lower that to a plain memcpy since nothing about the object size is
known, like this:
        call void @llvm.memcpy.i32(i8* %2, i8* %3, i32 4, i32 1)
The final 1 is alignment,  not anything to do with object-size.  I think this
is OK.

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