1#define _GNU_SOURCE 2#include "libc.h" 3#include "libm.h" 4#include <float.h> 5#include <math.h> 6 7#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024 8long double exp10l(long double x) { 9 return exp10(x); 10} 11#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384 12long double exp10l(long double x) { 13 static const long double p10[] = {1e-15L, 1e-14L, 1e-13L, 1e-12L, 1e-11L, 1e-10L, 1e-9L, 1e-8L, 14 1e-7L, 1e-6L, 1e-5L, 1e-4L, 1e-3L, 1e-2L, 1e-1L, 1, 15 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7, 1e8, 16 1e9, 1e10, 1e11, 1e12, 1e13, 1e14, 1e15}; 17 long double n, y = modfl(x, &n); 18 union ldshape u = {n}; 19 /* fabsl(n) < 16 without raising invalid on nan */ 20 if ((u.i.se & 0x7fff) < 0x3fff + 4) { 21 if (!y) 22 return p10[(int)n + 15]; 23 y = exp2l(3.32192809488736234787031942948939L * y); 24 return y * p10[(int)n + 15]; 25 } 26 return powl(10.0, x); 27} 28#endif 29 30weak_alias(exp10l, pow10l); 31