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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [ef_hypot.c] - Blame information for rev 158

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/* ef_hypot.c -- float version of e_hypot.c.
 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
 */
 
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */
 
#include "fdlibm.h"
 
#ifdef __STDC__
        float __ieee754_hypotf(float x, float y)
#else
        float __ieee754_hypotf(x,y)
        float x, y;
#endif
{
        float a=x,b=y,t1,t2,y1,y2,w;
        __int32_t j,k,ha,hb;
 
        GET_FLOAT_WORD(ha,x);
        ha &= 0x7fffffffL;
        GET_FLOAT_WORD(hb,y);
        hb &= 0x7fffffffL;
        if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
        SET_FLOAT_WORD(a,ha);   /* a <- |a| */
        SET_FLOAT_WORD(b,hb);   /* b <- |b| */
        if((ha-hb)>0xf000000L) {return a+b;} /* x/y > 2**30 */
        k=0;
        if(ha > 0x58800000L) {  /* a>2**50 */
           if(!FLT_UWORD_IS_FINITE(ha)) {       /* Inf or NaN */
               w = a+b;                 /* for sNaN */
               if(FLT_UWORD_IS_INFINITE(ha)) w = a;
               if(FLT_UWORD_IS_INFINITE(hb)) w = b;
               return w;
           }
           /* scale a and b by 2**-68 */
           ha -= 0x22000000L; hb -= 0x22000000L;        k += 68;
           SET_FLOAT_WORD(a,ha);
           SET_FLOAT_WORD(b,hb);
        }
        if(hb < 0x26800000L) {  /* b < 2**-50 */
            if(FLT_UWORD_IS_ZERO(hb)) {
                return a;
            } else if(FLT_UWORD_IS_SUBNORMAL(hb)) {
                SET_FLOAT_WORD(t1,0x7e800000L); /* t1=2^126 */
                b *= t1;
                a *= t1;
                k -= 126;
            } else {            /* scale a and b by 2^68 */
                ha += 0x22000000;       /* a *= 2^68 */
                hb += 0x22000000;       /* b *= 2^68 */
                k -= 68;
                SET_FLOAT_WORD(a,ha);
                SET_FLOAT_WORD(b,hb);
            }
        }
    /* medium size a and b */
        w = a-b;
        if (w>b) {
            SET_FLOAT_WORD(t1,ha&0xfffff000L);
            t2 = a-t1;
            w  = __ieee754_sqrtf(t1*t1-(b*(-b)-t2*(a+t1)));
        } else {
            a  = a+a;
            SET_FLOAT_WORD(y1,hb&0xfffff000L);
            y2 = b - y1;
            SET_FLOAT_WORD(t1,ha+0x00800000L);
            t2 = a - t1;
            w  = __ieee754_sqrtf(t1*y1-(w*(-w)-(t1*y2+t2*b)));
        }
        if(k!=0) {
            SET_FLOAT_WORD(t1,0x3f800000L+(k<<23));
            return t1*w;
        } else return w;
}

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(t1t1-(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(t1y1-(w(-w)-(t1y2+t2b)));`
78			`}`
79			`if(k!=0) {`
80			`SET_FLOAT_WORD(t1,0x3f800000L+(k<<23));`
81			`return t1*w;`
82			`} else return w;`
83			`}`

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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.17.0/] [newlib/] [libm/] [math/] [ef_hypot.c] - Blame information for rev 158