------- Comment #1 from ramana at gcc dot gnu dot org 2009-12-30 00:08 -------
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.
.text
.align 2
.global foo
.type foo, %function
foo:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
stmfd sp!, {r0, r1, r2, lr} @,
mov r3, r0 @ a, a
ldr r2, [r0, #12] @ tmp142,
str r2, [sp, #0] @ tmp142,
ldr r0, .L2 @,
ldmia r3, {r1, r2, r3} @ phole ldm
bl printf @
ldmfd sp!, {r1, r2, r3, pc}
.L3:
.align 2
.L2:
.word .LC0
.size foo, .-foo
.section .rodata.str1.1,"aMS",%progbits,1
.LC0:
.ascii "%d %d %d %d \012\000"
.ident "GCC: (GNU) 4.5.0 20091229 (experimental)"
.section .note.GNU-stack,"",%progbits
--
ramana at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|unnecessary register move |unnecessary register move
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42500
