glibc/sysdeps/x86_64/fpu/dla.h

#include <features.h>

#ifdef __FMA4__
# if __GNUC_PREREQ (4, 6)
#  define DLA_FMS(x,y,z) \
  __builtin_fma (x, y, -(z))
# else
#  define DLA_FMS(x,y,z) \
  ({ double __z;							      \
     asm ("vfmsubsd %3, %2, %1, %0"					      \
	  : "=x" (__z)							      \
	  : "x" ((double) (x)), "xm" ((double) (y)) , "x" ((double) (z)));    \
    __z; })
# endif
#endif

#include "sysdeps/ieee754/dbl-64/dla.h"
Better DLA_FMS It's better to use __builtin_fma if it works. Use it for gcc 4.6 and higher. Move the x86-64 dla.h to the correct place. 2011-10-25 02:11:21 +00:00			`#include <features.h>`

Use inline asm for DLA_FMS because of broken old compilers 2011-10-25 01:17:10 +00:00			`#ifdef __FMA4__`
Better DLA_FMS It's better to use __builtin_fma if it works. Use it for gcc 4.6 and higher. Move the x86-64 dla.h to the correct place. 2011-10-25 02:11:21 +00:00			`# if __GNUC_PREREQ (4, 6)`
			`# define DLA_FMS(x,y,z) \`
			`__builtin_fma (x, y, -(z))`
			`# else`
			`# define DLA_FMS(x,y,z) \`
Use inline asm for DLA_FMS because of broken old compilers 2011-10-25 01:17:10 +00:00			`({ double __z; \`
			`asm ("vfmsubsd %3, %2, %1, %0" \`
			`: "=x" (__z) \`
			`: "x" ((double) (x)), "xm" ((double) (y)) , "x" ((double) (z))); \`
			`__z; })`
Better DLA_FMS It's better to use __builtin_fma if it works. Use it for gcc 4.6 and higher. Move the x86-64 dla.h to the correct place. 2011-10-25 02:11:21 +00:00			`# endif`
Clean up last dla.h change 2011-10-23 16:50:28 +00:00			`#endif`

			`#include "sysdeps/ieee754/dbl-64/dla.h"`