------- Comment #5 from alexandre dot nunes at gmail dot com 2009-04-14 20:07
-------
See the attached pqp.c file.
With gcc 4.3.3, on such simplistic examples, peephole ldm and stm works:
sum:
ldr r2, .L3
ldmia r2, {r1, r3} @ phole ldm
add r3, r0, r3
add r0, r0, r1
stmia r2, {r0, r3} @ phole stm
bx lr
With gcc 4.4.0 branch, built on 20090413, it fails:
sum:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
ldr r3, .L3
ldr r2, [r3, #0]
ldr r1, [r3, #4]
add r2, r0, r2
add r1, r0, r1
str r1, [r3, #4]
str r2, [r3, #0]
bx lr
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9831
