glibc/sysdeps/i386/fpu/e_sqrtl.c

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/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*
* Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
*/
#include <math_private.h>
long double
__ieee754_sqrtl (long double x)
{
long double res;
asm ("fsqrt" : "=t" (res) : "0" (x));
return res;
}