http://sourceware.org/bugzilla/show_bug.cgi?id=15708
--- Comment #3 from Øystein Schønning-Johansen <oysteijo at gmail
dot com> ---
Hmmmmmm......
I think the problem may be the runtime library and not the assembler as I
assumed.
The main problem is that the OS is to old for the hardware:
$ cat /etc/redhat-release
Red Hat Enterprise Linux Client release 5.8 (Tikanga)
$ uname -a
Linux st-test-hp-z820 2.6.18-308.el5 #1 SMP Fri Jan 27 17:17:51 EST 2012 x8
6_64
x86_64 x86_64 GNU/Linux
Here's a test program:
$ cat avxtest.c
#include <stdio.h>
#include <cpuid.h>
int main()
{
unsigned int eax = 1, ebx, ecx, edx;
__get_cpuid( 1, &eax, &ebx, &ecx, &edx );
printf("AVX: %s\n", ( ecx & bit_AVX ) ? "YES!" : "Sorry." );
return 0;
}
$ gcc -o avxtest avxtest.c && ./avxtest
AVX: YES!
But then:
$ cat /proc/cpuinfo | grep flags | tail -1
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx pdpe1gb rd
tscp
lm constant_tsc ida nonstop_tsc arat pni monitor ds_cpl vmx smx est tm2 sss
e3
cx16 xtpr sse4_1 sse4_2 popcnt lahf_lm
No AVX on that list.....?
Disassemby:
(gdb) disass
Dump of assembler code for function main:
0x0000000000400520 <main+0>: push %rbp
0x0000000000400521 <main+1>: mov %rsp,%rbp
0x0000000000400524 <main+4>: sub $0x10,%rsp
0x0000000000400528 <main+8>: mov 0x11e(%rip),%eax # 0x40064c
0x000000000040052e <main+14>: mov %eax,-0x4(%rbp)
0x0000000000400531 <main+17>: vmovss -0x4(%rbp),%xmm0
0x0000000000400536 <main+22>: vcvtps2pd %xmm0,%xmm0
0x000000000040053a <main+26>: mov $0x40063c,%edi
0x000000000040053f <main+31>: mov $0x1,%eax
0x0000000000400544 <main+36>: callq 0x4003a0 <printf@plt>
0x0000000000400549 <main+41>: mov $0x0,%eax
0x000000000040054e <main+46>: leaveq
0x000000000040054f <main+47>: retq
End of assembler dump.
Could it be something incompatible to the runtime libraries:
$ ldd mytest
linux-vdso.so.1 => (0x00007fffe6dfd000)
libc.so.6 => /lib64/libc.so.6 (0x000000355e800000)
/lib64/ld-linux-x86-64.so.2 (0x000000355e400000)
Thanks,
-Øystein
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