https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56550
Christophe Lyon <clyon at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |clyon at gcc dot gnu.org
Target| |arm
--- Comment #1 from Christophe Lyon <clyon at gcc dot gnu.org> ---
With today's trunk, the generated code with -mcpu=cortex-m3 -mthumb is:
main:
@ args = 0, pretend = 0, frame = 8
@ frame_needed = 1, uses_anonymous_args = 0
@ link register save eliminated.
push {r7}
sub sp, sp, #12
add r7, sp, #0
mvn r3, #254
str r3, [r7, #4]
ldr r3, [r7, #4]
ldr r2, .L3
str r3, [r2, #7] @ unaligned
movs r3, #0
mov r0, r3
adds r7, r7, #12
mov sp, r7
@ sp needed
ldr r7, [sp], #4
bx lr
Since cortex-m3 supports unaligned accesses, the use of
str r3, [r2, #7] @ unaligned
looks OK
