http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49335
--- Comment #1 from Michael Hope <michael.hope at linaro dot org> 2011-06-08
22:33:32 UTC ---
Forgot the configuration:
Configured with: '../../gcc-4.7~/configure'
--prefix='/scratch/cbuild/slave/slaves/ursa3/gcc-4.7~svn174795/gcc/default/install'
--enable-languages=c,c++,objc,obj-c++,fortran,lto --with-mode=thumb
--with-arch=armv7-a --with-tune=cortex-a9 --with-float=softfp --with-fpu=neon
Thread model: posix
gcc version 4.7.0 20110608 (experimental) [trunk revision 174795] (GCC)
michaelh@ursa2:~/linaro/bugs$ as -v
GNU assembler version 2.20.51 (arm-linux-gnueabi) using BFD version (GNU
Binutils for Ubuntu) 2.20.51-system.20100908
michaelh@ursa2:~/linaro/bugs$ uname -a
Linux ursa2 2.6.35.3-cbuild2+ #8 SMP Mon Apr 4 12:46:46 NZST 2011 armv7l
GNU/Linux
michaelh@ursa2:~/linaro/bugs$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 10.10
Release: 10.10
Codename: maverick
The fault also occurs at -O1 and -O3 but not at -O0.
The assembly in the region is:
.L33:
movs r1, #0
movs r2, #64
mov r0, sp
mov r9, sp
bl memset
cmp r4, #4
beq .L11
add r0, r8, r4, lsl #2
rsb r6, r8, #4
lsls r6, r6, #2
rsb r1, r4, #4
rsb r0, sp, r0, lsl #2
mov r4, sp
mov lr, #0
which matches the final lines of the function. It looks like the code should
be using r9 instead of sp.
