[Bug target/51001] redundant address re-computations on ARM

[yufeng at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51001

Yufeng Zhang <yufeng at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2013-10-31
                 CC|                            |yufeng at gcc dot gnu.org
     Ever confirmed|0                           |1
      Known to fail|                            |4.9.0

--- Comment #1 from Yufeng Zhang <yufeng at gcc dot gnu.org> ---
I can confirm that the similar issue exists using the trunk compiler with -O2
-mcpu=cortex-a15

foo:
        @ args = 0, pretend = 0, frame = 0
        @ frame_needed = 0, uses_anonymous_args = 0
        @ link register save eliminated.
        mov     r3, #53248
        mvn     r2, #85
        mov     r1, r3
        strb    r2, [r3, #2755]
.L3:
        ldrb    r3, [r1, #2754] @ zero_extendqisi2
        mov     r2, #53248
        tst     r3, #128
        beq     .L3
        mvn     r3, #68
        mov     r1, r2
        strb    r3, [r2, #2755]
.L5:
        ldrb    r3, [r1, #2754] @ zero_extendqisi2
        tst     r3, #128
        beq     .L5
        bx      lr

The -fdump-tree-optimized dump looks OK.