[Bug target/42500] unnecessary register move

[ramana at gcc dot gnu dot org]

------- Comment #2 from ramana at gcc dot gnu dot org  2009-12-30 00:10 -------
(In reply to comment #1)
> What architecture options are you using  ? With         .ident  "GCC: (GNU)
> 4.5.0 20091229 (experimental)" and -O2 I get the redundant move into r4 of sp . 
> 
> But for -Os I get the following very different code.  I don't see the call to
> memset ever. \

Sorry I meant this rather than the code in comment #1

bar:
        @ args = 0, pretend = 0, frame = 16
        @ frame_needed = 0, uses_anonymous_args = 0
        stmfd   sp!, {r0, r1, r2, r3, r4, lr}
        str     r0, [sp, #0]
        mov     r0, sp
        stmib   sp, {r1, r2, r3}        @ phole stm
        bl      foo
        mov     r0, sp
        mov     r4, sp
        bl      foo
        ldmfd   sp!, {r0, r1, r2, r3, r4, pc}
        .size   bar, .-bar
        .ident  "GCC: (GNU) 4.5.0 20091229 (experimental)"
        .section        .note.GNU-stack,"",%progbits


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42500