https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61578
--- Comment #21 from Fredrik Hederstierna
<fredrik.hederstie...@securitas-direct.com> ---
Great, thanks!
Just a note as you are looking into this,
neither GCC 4.8.x nor GCC 5.2.x produces the optimal code I think for this
case,
isn't it better to load result register r0, instead of go over r3?
GCC 4.8.5 (good version):
isascii:
mov r2, #127
mov r3, #0
cmp r2, r0
adc r3, r3, r3
mov r0, r3
bx lr
better ??:
isascii:
mov r2, #127
mov r3, #0
cmp r2, r0
+ adc r0, r3, r3 <----- put result in R0 directly?
- adc r3, r3, r3
- mov r0, r3
bx lr
This would save one more instruction if I'm thinking right.
BR, Fredrik
