https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82034
Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |WORKSFORME
--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
Your example command line has no optimization flags on it, so it's not
surprising that you don't see the idiom reduced. With gcc-7 and -O3 I get:
sub sp, sp, #16
movs r1, #1
movs r2, #2
movs r3, #3
str r1, [sp, #4]
str r2, [sp, #8]
str r3, [sp, #12]
ldr r0, [sp, #4]
ldr r3, [sp, #8]
ldr r2, [sp, #12]
.syntax unified
@ 15 "test.c" 1
smmlar r3, r3, r2, r0
@ 0 "" 2
.thumb
.syntax unified
add sp, sp, #16
@ sp needed
bx lr
