------- Comment #9 from jingyu at google dot com 2010-02-10 12:18 -------
I still get the 10-instruction code with trunk GCC I checked out today.
$arm-eabi-gcc -mthumb -mthumb-interwork -fpic -Os code.c -S
test:
push {lr}
sub sp, sp, #20
ldr r2, [r0]
add r3, sp, #4
ldr r1, [r0, #4]
str r2, [r3, #4]
mov r0, r3
bl func
add sp, sp, #20
@ sp needed for prologue
pop {r0}
bx r0
.size test, .-test
.ident "GCC: (GNU) 4.5.0 20100210 (experimental)"
The toolchain was built with newlib-1.17.0, mpc-0.8.1, mpfr-2.4.1, gmp-4.2.4,
binutils-2.19.
Target: arm-eabi
Configured with:
/usr/local/home/projects/newlib_armtoolchain/gcc-trunk-read/configure
--prefix=/usr/local/home/projects/toolchain_build/newlib_build_trunk/install
--target=arm-eabi --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--with-gmp=/usr/local/home/projects/toolchain_build/newlib_build_trunk/install
--with-mpfr=/usr/local/home/projects/toolchain_build/newlib_build_trunk/install
--with-mpc=/usr/local/home/projects/toolchain_build/newlib_build_trunk/install
--enable-multilib --with-newlib --with-gnu-as --with-gnu-ld
--enable-languages=c,c++
Thread model: single
gcc version 4.5.0 20100210 (experimental) (GCC)
Steven, could you please share how you build the toolchain which generates the
9-instruction code?
Thanks!
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39871
