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Subject: [Bug middle-end/41004] missed merge of basic blocks
Date: Fri, 09 Nov 2012 21:38:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41004

Steven Bosscher <steven at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED
   Target Milestone|---                         |4.8.0
      Known to fail|                            |4.8.0

--- Comment #10 from Steven Bosscher <steven at gcc dot gnu.org> 2012-11-09 21:38:39 UTC ---
Resulting code from trunk r193358

primal_update_flow:
        push    {r4, r5, lr}
        mov     r3, #1
        mov     r4, #0
.L2:
        cmp     r0, r2
        beq     .L11
        ldr     r5, [r0]
        cmp     r5, #0
        beq     .L3
        str     r4, [r0, #8]
        b       .L4
.L3:
        str     r3, [r0, #8]
.L4:
        ldr     r0, [r0, #4]
        b       .L2
.L11:
        mov     r0, #1
.L6:
        cmp     r1, r2
        beq     .L12
        ldr     r3, [r1]
        cmp     r3, #0
        beq     .L7
        str     r0, [r1, #8]
        b       .L8
.L7:
        str     r3, [r1, #8]
.L8:
        ldr     r1, [r1, #4]
        b       .L6
.L12:   
        @ sp needed
        pop     {r4, r5, pc}

So the issue of comment #0 is fixed.

With "-march=armv7 -mthumb" the stores to "[r0,#8]" and "[r0,#8]" are
properly if-converted, I don't see anything that could be improved
further.  So, fixed.