1#include "libm.h" 2 3float truncf(float x) { 4 union { 5 float f; 6 uint32_t i; 7 } u = {x}; 8 int e = (int)(u.i >> 23 & 0xff) - 0x7f + 9; 9 uint32_t m; 10 11 if (e >= 23 + 9) 12 return x; 13 if (e < 9) 14 e = 1; 15 m = -1U >> e; 16 if ((u.i & m) == 0) 17 return x; 18 FORCE_EVAL(x + 0x1p120f); 19 u.i &= ~m; 20 return u.f; 21} 22