------- Comment #2 from mikpe at it dot uu dot se 2010-04-09 06:57 -------
Compiling this with gcc-4.5.0-RC-20100406 -march=armv7-a -Os I get:
X:
@ args = 0, pretend = 0, frame = 0
@ frame_needed = 0, uses_anonymous_args = 0
@ link register save eliminated.
ldr r3, .L4
ldr r2, [r2, #0]
ldr r1, [r1, #0]
ldrb r3, [r3, #0] @ zero_extendqisi2
cmp r3, #0
moveq r3, r2, asr #31
rev r2, r2
movne r3, #0
.L3:
add r2, r1, r2
str r2, [r0, #0]
bx lr
.L5:
.align 2
.L4:
.word .LANCHOR0
...
.LANCHOR0 = . + 0
.type do_reverse_endian, %object
.size do_reverse_endian, 1
do_reverse_endian:
.space 1
which looks completely bogus. It's unconditionally rev:ing *phoff in r2 and
conditionally (based on do_reverse_endian) munging r3 which is dead.
I can't test this however as my HW is armv5tel.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
