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