[Bug rtl-optimization/66665] Increment instruction is not propagated into address operand

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66665

H.J. Lu <hjl.tools at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-06-30
     Ever confirmed|0                           |1

--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
It is caused by the combination of -mregparm=3 -mtune=i686.
-mregparm=3 -mtune=generic -O2 gives

f:
        .cfi_startproc
        movsbl  a+1(%eax), %edx
        movsbl  b+1(%eax), %eax
        addl    %edx, %eax
        ret
        .cfi_endproc