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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/52412] another unnecessary register move on arm
Date: Wed, 09 Jul 2014 08:42:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 4.7.0
X-Bugzilla-Keywords: missed-optimization, ra
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ktkachov at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
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Message-ID: <bug-52412-4-QlXmbHQQbX@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-52412-4@http.gcc.gnu.org/bugzilla/>
References: <bug-52412-4@http.gcc.gnu.org/bugzilla/>
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52412

ktkachov at gcc dot gnu.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |ktkachov at gcc dot gnu.org
         Resolution|---                         |FIXED

--- Comment #3 from ktkachov at gcc dot gnu.org ---
Both trunk 4.10 and 4.8.3 generate:
t0m:
        @ args = 0, pretend = 0, frame = 0
        @ frame_needed = 0, uses_anonymous_args = 0
        ldr     r3, [r0, #4]
        movs    r1, #10
        push    {r4, r5, lr}
        ldr     r5, .L8
        uxtb    r2, r3
.L2:
        ldr     r4, [r0, #268]
        subs    r1, r1, #1
        eor     r4, r4, r2
        ldr     r4, [r5, r4, lsl #2]
        str     r4, [r0, #268]
        bne     .L2
        add     r3, r3, r0
        movs    r1, #1
        strb    r1, [r3, #12]
        ldr     r3, [r0, #8]
        cmp     r3, r1
        beq     .L5
        cmp     r3, #2
        beq     .L5
        pop     {r4, r5, pc}
.L5:
        ldr     r3, [r0]
        strb    r2, [r3]
        pop     {r4, r5, pc}
.L9:
        .align  2
.L8:
        .word   Table


No superfluous mov appears, so I think this can be closed now...