AMD xop check support

Question

I have next problem:
I have some tests related to xop check with using some Bulldozer (xop) instructions.
And I must run this tests only on Bulldozer processors.
How can I check that my processor supports xop instruction at compile-time?

Language: C, Os: Linux;

Answer 1

You can write a program that checks CPUID and use the output of that program while compiling:
gcc $(cpuid_test) my_prog.c

where cpuid_test returns '-march=bdver1' or -DXOP_SUPPORT=1

Answer 2

You cannot test at compile time, but you can compile for AMD Bulldozer using:

$ gcc -march=bdver1 -mtune=bdver1 ...

See: http://gcc.gnu.org/gcc-4.6/changes.html

If your build machine is your target machine, look into /proc/cpuinfo.

Answer 3

If a source is compiled with -march=bdver1 (which enables XOP support among other things), the preprocessor macro __XOP__ will be defined to 1.

You can test at compile time for XOP with

#ifdef __XOP__
     ...XOP code path here...
#else
     ...non XOP code here...
#endif