Optimal CFLAGS for armv5te?
Khem Raj
raj.khem at gmail.com
Tue Jun 1 07:19:25 UTC 2010
On Mon, May 31, 2010 at 4:56 AM, Oleg Kravchenko <oleg at kaa.org.ua> wrote:
> What optimal cflags for CPU:
>
>>asusp535 ~ # cat /proc/cpuinfo
>>Processor : XScale-PXA270 rev 7 (v5l)
>>BogoMIPS : 519.37
>>Features : swp half thumb fastmult edsp iwmmxt
>>CPU implementer : 0x69
>>CPU architecture: 5TE
>>CPU variant : 0x0
>>CPU part : 0x411
>>CPU revision : 7
>>Cache type : undefined 5
>>Cache clean : undefined 5
>>Cache lockdown : undefined 5
>>Cache format : Harvard
>>I size : 32768
>>I assoc : 32
>>I line length : 32
>>I sets : 32
>>D size : 32768
>>D assoc : 32
>>D line length : 32
>>D sets : 32
>>
>>Hardware : Asus P535
>>Revision : 0000
>>Serial : 0000000000000000
>
> I am try with this "-pipe -Os -march=armv5te -mtune=iwmmxt -fomit-frame-
> pointer" But iwmmxt don't work :(
>
>>asusp535 ~ # cat iwmmxt.c
>>#include <mmintrin.h>
>>
>>int main(int, char**)
>>{
>> _mm_unpackhi_pi16(_mm_setzero_si64(), _mm_setzero_si64());
>> return 0;
>>}
>
>
>>asusp535 ~ # gcc test_iwmmxt.c -pipe -Os -march=armv5te -mtune=iwmmxt -fomit-
> frame-pointer -o /dev/null
>>{standard input}: Assembler messages:
>>{standard input}:22: Error: selected processor does not support `wunpckelub
> wr6,wr4'
>
> I am try this "-pipe -Os -march=iwmmxt -mtune=iwmmxt -fomit-frame-pointer" but
> i can't get stable software for example gcc can't build them self
>
> I am watch cflags in uCLibc -march=armv5te -Wa,-mcpu=xscale as result:
>
>>asusp535 ~ # gcc test_iwmmxt.c -pipe -Os -march=armv5te -Wa,-mcpu=xscale -
> fomit-frame-pointer -o /dev/null
>>{standard input}: Assembler messages:
>>{standard input}:22: Error: selected processor does not support `wunpckelub
> wr6,wr4'
this is iwmmxt instruction. It seems your assembler is not including iwmmxt when
you select xscale. What version of binutils and gcc are you using.
>
> I am confused :)))
>
> P.S. -march=native work only for x86 ;D
> _______________________________________________
> uClibc mailing list
> uClibc at uclibc.org
> http://lists.busybox.net/mailman/listinfo/uclibc
>
More information about the uClibc
mailing list