[Bug target/27187] New: gcc.target/powerpc/doloop-1.c doesn't get desired branch insn

[janis at gcc dot gnu dot org]

Test gcc.target/powerpc/doloop-1.c has failed on mainline for powerpc64-linux
with -m64 and for powerpc-apple-darwin8.5.0 since this patch was added:

http://gcc.gnu.org/viewcvs?view=rev&rev=112126

r112126 | mkuvyrkov | 2006-03-16 05:20:39 +0000 (Thu, 16 Mar 2006) | 9 lines

2006-03-16  Maxim Kuvyrkov <mkuvyrkov@ispras.ru>

        * sched-rgn.c (extend_rgns): New static function.
        (find_rgns): Use it.
        (gather_region_statistics, print_region_statistics): New static
        functions.
        * params.def (PARAM_MAX_SCHED_EXTEND_REGIONS_ITERS): New parameter.
        * doc/invoke.texi (max-sched-extend-regions-iters): Document.

The test fails because instruction bdnz is no longer generated.  The loop in
queston went from:

.L7:
        add 4,4,9
        addi 9,9,1
        bdnz .L7

to:

.L7:
        addic. 0,0,-1
        add 4,4,9
        addi 9,9,1
        bne 0,.L7


-- 
           Summary: gcc.target/powerpc/doloop-1.c doesn't get desired branch
                    insn
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: janis at gcc dot gnu dot org
GCC target triplet: powerpc-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=27187