1#include <math.h> 2 3float sqrtf(float x) 4{ 5 long double t; 6 /* The long double result has sufficient precision so that 7 * second rounding to float still keeps the returned value 8 * correctly rounded, see Pierre Roux, "Innocuous Double 9 * Rounding of Basic Arithmetic Operations". */ 10 __asm__ ("fsqrt" : "=t"(t) : "0"(x)); 11 return (float)t; 12} 13