[Bug target/17108] Store with update not generated for a simple loop

[PHHargrove at lbl dot gov]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17108

Paul H. Hargrove <PHHargrove at lbl dot gov> changed:

           What    |Removed                     |Added
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                 CC|                            |PHHargrove at lbl dot gov

--- Comment #7 from Paul H. Hargrove <PHHargrove at lbl dot gov> 2012-08-13 
23:19:45 UTC ---
FWIW:
With GCC 4.8.0 20120809 the test code is fully unrolled at -O3:
.L.foo:
        stfs 1,0(3)
        stfs 1,4(3)
        stfs 1,8(3)
        stfs 1,12(3)
        stfs 1,16(3)
        stfs 1,20(3)
        stfs 1,24(3)
        stfs 1,28(3)
        blr

However, at -O2 the code shown in comment #6 is still being generated (except
with different register allocations).  This is true even when "-mupdate" is
passed to explicitly enable store/update instructions.