glibc/sysdeps/x86_64/fpu/multiarch/e_pow.c

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#ifdef HAVE_FMA4_SUPPORT
# include <init-arch.h>
# include <math_private.h>
extern double __ieee754_pow_sse2 (double, double);
extern double __ieee754_pow_fma4 (double, double);
libm_ifunc (__ieee754_pow, HAS_FMA4 ? __ieee754_pow_fma4 : __ieee754_pow_sse2);
strong_alias (__ieee754_pow, __pow_finite)
# define __ieee754_pow __ieee754_pow_sse2
#endif
#include <sysdeps/ieee754/dbl-64/e_pow.c>