OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-old/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [ef_hypot.c] - Blame information for rev 855

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 148 jeremybenn
/* ef_hypot.c -- float version of e_hypot.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
#include "fdlibm.h"
17
 
18
#ifdef __STDC__
19
        float __ieee754_hypotf(float x, float y)
20
#else
21
        float __ieee754_hypotf(x,y)
22
        float x, y;
23
#endif
24
{
25
        float a=x,b=y,t1,t2,y1,y2,w;
26
        __int32_t j,k,ha,hb;
27
 
28
        GET_FLOAT_WORD(ha,x);
29
        ha &= 0x7fffffffL;
30
        GET_FLOAT_WORD(hb,y);
31
        hb &= 0x7fffffffL;
32
        if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
33
        SET_FLOAT_WORD(a,ha);   /* a <- |a| */
34
        SET_FLOAT_WORD(b,hb);   /* b <- |b| */
35
        if((ha-hb)>0xf000000L) {return a+b;} /* x/y > 2**30 */
36
        k=0;
37
        if(ha > 0x58800000L) {  /* a>2**50 */
38
           if(!FLT_UWORD_IS_FINITE(ha)) {       /* Inf or NaN */
39
               w = a+b;                 /* for sNaN */
40
               if(FLT_UWORD_IS_INFINITE(ha)) w = a;
41
               if(FLT_UWORD_IS_INFINITE(hb)) w = b;
42
               return w;
43
           }
44
           /* scale a and b by 2**-68 */
45
           ha -= 0x22000000L; hb -= 0x22000000L;        k += 68;
46
           SET_FLOAT_WORD(a,ha);
47
           SET_FLOAT_WORD(b,hb);
48
        }
49
        if(hb < 0x26800000L) {  /* b < 2**-50 */
50
            if(FLT_UWORD_IS_ZERO(hb)) {
51
                return a;
52
            } else if(FLT_UWORD_IS_SUBNORMAL(hb)) {
53
                SET_FLOAT_WORD(t1,0x7e800000L); /* t1=2^126 */
54
                b *= t1;
55
                a *= t1;
56
                k -= 126;
57
            } else {            /* scale a and b by 2^68 */
58
                ha += 0x22000000;       /* a *= 2^68 */
59
                hb += 0x22000000;       /* b *= 2^68 */
60
                k -= 68;
61
                SET_FLOAT_WORD(a,ha);
62
                SET_FLOAT_WORD(b,hb);
63
            }
64
        }
65
    /* medium size a and b */
66
        w = a-b;
67
        if (w>b) {
68
            SET_FLOAT_WORD(t1,ha&0xfffff000L);
69
            t2 = a-t1;
70
            w  = __ieee754_sqrtf(t1*t1-(b*(-b)-t2*(a+t1)));
71
        } else {
72
            a  = a+a;
73
            SET_FLOAT_WORD(y1,hb&0xfffff000L);
74
            y2 = b - y1;
75
            SET_FLOAT_WORD(t1,ha+0x00800000L);
76
            t2 = a - t1;
77
            w  = __ieee754_sqrtf(t1*y1-(w*(-w)-(t1*y2+t2*b)));
78
        }
79
        if(k!=0) {
80
            SET_FLOAT_WORD(t1,0x3f800000L+(k<<23));
81
            return t1*w;
82
        } else return w;
83
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.