1/* s_floorf.c -- float version of s_floor.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
12 * is preserved.
13 * ====================================================
14 */
15
16/*
17 * floorf(x)
18 * Return x rounded toward -inf to integral value
19 * Method:
20 * Bit twiddling.
21 */
22
23#define NO_MATH_REDIRECT
24#include <math.h>
25#include <math_private.h>
26#include <libm-alias-float.h>
27
28float
29__floorf(float x)
30{
31 int32_t i0,j0;
32 uint32_t i;
33 GET_FLOAT_WORD(i0,x);
34 j0 = ((i0>>23)&0xff)-0x7f;
35 if(j0<23) {
36 if(j0<0) {
37 /* return 0*sign(x) if |x|<1 */
38 if(i0>=0) {i0=0;}
39 else if((i0&0x7fffffff)!=0)
40 { i0=0xbf800000;}
41 } else {
42 i = (0x007fffff)>>j0;
43 if((i0&i)==0) return x; /* x is integral */
44 if(i0<0) i0 += (0x00800000)>>j0;
45 i0 &= (~i);
46 }
47 } else {
48 if(__builtin_expect(j0==0x80, 0)) return x+x; /* inf or NaN */
49 else return x; /* x is integral */
50 }
51 SET_FLOAT_WORD(x,i0);
52 return x;
53}
54#ifndef __floorf
55libm_alias_float (__floor, floor)
56#endif
57