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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	lib/libm/src/e_rem_pio2f.c	Lines:	0	65	0.0 %
Date:	2017-11-07	Branches:	0	30	0.0 %


/* e_rem_pio2f.c -- float version of e_rem_pio2.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.
 * ====================================================
 */

/* __ieee754_rem_pio2f(x,y)
 *
 * return the remainder of x rem pi/2 in y[0]+y[1]
 * use __kernel_rem_pio2f()
 */

#include "math.h"
#include "math_private.h"

/*
 * Table of constants for 2/pi, 396 Hex digits (476 decimal) of 2/pi
 */
static const int32_t two_over_pi[] = {
0xA2, 0xF9, 0x83, 0x6E, 0x4E, 0x44, 0x15, 0x29, 0xFC,
0x27, 0x57, 0xD1, 0xF5, 0x34, 0xDD, 0xC0, 0xDB, 0x62,
0x95, 0x99, 0x3C, 0x43, 0x90, 0x41, 0xFE, 0x51, 0x63,
0xAB, 0xDE, 0xBB, 0xC5, 0x61, 0xB7, 0x24, 0x6E, 0x3A,
0x42, 0x4D, 0xD2, 0xE0, 0x06, 0x49, 0x2E, 0xEA, 0x09,
0xD1, 0x92, 0x1C, 0xFE, 0x1D, 0xEB, 0x1C, 0xB1, 0x29,
0xA7, 0x3E, 0xE8, 0x82, 0x35, 0xF5, 0x2E, 0xBB, 0x44,
0x84, 0xE9, 0x9C, 0x70, 0x26, 0xB4, 0x5F, 0x7E, 0x41,
0x39, 0x91, 0xD6, 0x39, 0x83, 0x53, 0x39, 0xF4, 0x9C,
0x84, 0x5F, 0x8B, 0xBD, 0xF9, 0x28, 0x3B, 0x1F, 0xF8,
0x97, 0xFF, 0xDE, 0x05, 0x98, 0x0F, 0xEF, 0x2F, 0x11,
0x8B, 0x5A, 0x0A, 0x6D, 0x1F, 0x6D, 0x36, 0x7E, 0xCF,
0x27, 0xCB, 0x09, 0xB7, 0x4F, 0x46, 0x3F, 0x66, 0x9E,
0x5F, 0xEA, 0x2D, 0x75, 0x27, 0xBA, 0xC7, 0xEB, 0xE5,
0xF1, 0x7B, 0x3D, 0x07, 0x39, 0xF7, 0x8A, 0x52, 0x92,
0xEA, 0x6B, 0xFB, 0x5F, 0xB1, 0x1F, 0x8D, 0x5D, 0x08,
0x56, 0x03, 0x30, 0x46, 0xFC, 0x7B, 0x6B, 0xAB, 0xF0,
0xCF, 0xBC, 0x20, 0x9A, 0xF4, 0x36, 0x1D, 0xA9, 0xE3,
0x91, 0x61, 0x5E, 0xE6, 0x1B, 0x08, 0x65, 0x99, 0x85,
0x5F, 0x14, 0xA0, 0x68, 0x40, 0x8D, 0xFF, 0xD8, 0x80,
0x4D, 0x73, 0x27, 0x31, 0x06, 0x06, 0x15, 0x56, 0xCA,
0x73, 0xA8, 0xC9, 0x60, 0xE2, 0x7B, 0xC0, 0x8C, 0x6B,
};

/* This array is like the one in e_rem_pio2.c, but the numbers are
   single precision and the last 8 bits are forced to 0.  */
static const int32_t npio2_hw[] = {
0x3fc90f00, 0x40490f00, 0x4096cb00, 0x40c90f00, 0x40fb5300, 0x4116cb00,
0x412fed00, 0x41490f00, 0x41623100, 0x417b5300, 0x418a3a00, 0x4196cb00,
0x41a35c00, 0x41afed00, 0x41bc7e00, 0x41c90f00, 0x41d5a000, 0x41e23100,
0x41eec200, 0x41fb5300, 0x4203f200, 0x420a3a00, 0x42108300, 0x4216cb00,
0x421d1400, 0x42235c00, 0x4229a500, 0x422fed00, 0x42363600, 0x423c7e00,
0x4242c700, 0x42490f00
};

/*
 * invpio2:  24 bits of 2/pi
 * pio2_1:   first  17 bit of pi/2
 * pio2_1t:  pi/2 - pio2_1
 * pio2_2:   second 17 bit of pi/2
 * pio2_2t:  pi/2 - (pio2_1+pio2_2)
 * pio2_3:   third  17 bit of pi/2
 * pio2_3t:  pi/2 - (pio2_1+pio2_2+pio2_3)
 */

static const float
zero =  0.0000000000e+00, /* 0x00000000 */
half =  5.0000000000e-01, /* 0x3f000000 */
two8 =  2.5600000000e+02, /* 0x43800000 */
invpio2 =  6.3661980629e-01, /* 0x3f22f984 */
pio2_1  =  1.5707855225e+00, /* 0x3fc90f80 */
pio2_1t =  1.0804334124e-05, /* 0x37354443 */
pio2_2  =  1.0804273188e-05, /* 0x37354400 */
pio2_2t =  6.0770999344e-11, /* 0x2e85a308 */
pio2_3  =  6.0770943833e-11, /* 0x2e85a300 */
pio2_3t =  6.1232342629e-17; /* 0x248d3132 */

int32_t
__ieee754_rem_pio2f(float x, float *y)
{
	float z,w,t,r,fn;
	float tx[3];
	int32_t e0,i,j,nx,n,ix,hx;

	GET_FLOAT_WORD(hx,x);
	ix = hx&0x7fffffff;
	if(ix<=0x3f490fd8)   /* |x| ~<= pi/4 , no need for reduction */
	    {y[0] = x; y[1] = 0; return 0;}
	if(ix<0x4016cbe4) {  /* |x| < 3pi/4, special case with n=+-1 */
	    if(hx>0) {
		z = x - pio2_1;
		if((ix&0xfffffff0)!=0x3fc90fd0) { /* 24+24 bit pi OK */
		    y[0] = z - pio2_1t;
		    y[1] = (z-y[0])-pio2_1t;
		} else {		/* near pi/2, use 24+24+24 bit pi */
		    z -= pio2_2;
		    y[0] = z - pio2_2t;
		    y[1] = (z-y[0])-pio2_2t;
		}
		return 1;
	    } else {	/* negative x */
		z = x + pio2_1;
		if((ix&0xfffffff0)!=0x3fc90fd0) { /* 24+24 bit pi OK */
		    y[0] = z + pio2_1t;
		    y[1] = (z-y[0])+pio2_1t;
		} else {		/* near pi/2, use 24+24+24 bit pi */
		    z += pio2_2;
		    y[0] = z + pio2_2t;
		    y[1] = (z-y[0])+pio2_2t;
		}
		return -1;
	    }
	}
	if(ix<=0x43490f80) { /* |x| ~<= 2^7*(pi/2), medium size */
	    t  = fabsf(x);
	    n  = (int32_t) (t*invpio2+half);
	    fn = (float)n;
	    r  = t-fn*pio2_1;
	    w  = fn*pio2_1t;	/* 1st round good to 40 bit */
	    if(n<32&&(ix&0xffffff00)!=npio2_hw[n-1]) {
		y[0] = r-w;	/* quick check no cancellation */
	    } else {
	        u_int32_t high;
	        j  = ix>>23;
	        y[0] = r-w;
		GET_FLOAT_WORD(high,y[0]);
	        i = j-((high>>23)&0xff);
	        if(i>8) {  /* 2nd iteration needed, good to 57 */
		    t  = r;
		    w  = fn*pio2_2;
		    r  = t-w;
		    w  = fn*pio2_2t-((t-r)-w);
		    y[0] = r-w;
		    GET_FLOAT_WORD(high,y[0]);
		    i = j-((high>>23)&0xff);
		    if(i>25)  {	/* 3rd iteration need, 74 bits acc */
		    	t  = r;	/* will cover all possible cases */
		    	w  = fn*pio2_3;
		    	r  = t-w;
		    	w  = fn*pio2_3t-((t-r)-w);
		    	y[0] = r-w;
		    }
		}
	    }
	    y[1] = (r-y[0])-w;
	    if(hx<0) 	{y[0] = -y[0]; y[1] = -y[1]; return -n;}
	    else	 return n;
	}
    /*
     * all other (large) arguments
     */
	if(ix>=0x7f800000) {		/* x is inf or NaN */
	    y[0]=y[1]=x-x; return 0;
	}
    /* set z = scalbn(|x|,ilogb(x)-7) */
	e0 	= (ix>>23)-134;		/* e0 = ilogb(z)-7; */
	SET_FLOAT_WORD(z, ix - ((int32_t)(e0<<23)));
	for(i=0;i<2;i++) {
		tx[i] = (float)((int32_t)(z));
		z     = (z-tx[i])*two8;
	}
	tx[2] = z;
	nx = 3;
	while(tx[nx-1]==zero) nx--;	/* skip zero term */
	n  =  __kernel_rem_pio2f(tx,y,e0,nx,2,two_over_pi);
	if(hx<0) {y[0] = -y[0]; y[1] = -y[1]; return -n;}
	return n;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* e_rem_pio2f.c -- float version of e_rem_pio2.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			/* __ieee754_rem_pio2f(x,y)
17			*
18			* return the remainder of x rem pi/2 in y[0]+y[1]
19			* use __kernel_rem_pio2f()
20			*/
21
22			#include "math.h"
23			#include "math_private.h"
24
25			/*
26			* Table of constants for 2/pi, 396 Hex digits (476 decimal) of 2/pi
27			*/
28			static const int32_t two_over_pi[] = {
29			0xA2, 0xF9, 0x83, 0x6E, 0x4E, 0x44, 0x15, 0x29, 0xFC,
30			0x27, 0x57, 0xD1, 0xF5, 0x34, 0xDD, 0xC0, 0xDB, 0x62,
31			0x95, 0x99, 0x3C, 0x43, 0x90, 0x41, 0xFE, 0x51, 0x63,
32			0xAB, 0xDE, 0xBB, 0xC5, 0x61, 0xB7, 0x24, 0x6E, 0x3A,
33			0x42, 0x4D, 0xD2, 0xE0, 0x06, 0x49, 0x2E, 0xEA, 0x09,
34			0xD1, 0x92, 0x1C, 0xFE, 0x1D, 0xEB, 0x1C, 0xB1, 0x29,
35			0xA7, 0x3E, 0xE8, 0x82, 0x35, 0xF5, 0x2E, 0xBB, 0x44,
36			0x84, 0xE9, 0x9C, 0x70, 0x26, 0xB4, 0x5F, 0x7E, 0x41,
37			0x39, 0x91, 0xD6, 0x39, 0x83, 0x53, 0x39, 0xF4, 0x9C,
38			0x84, 0x5F, 0x8B, 0xBD, 0xF9, 0x28, 0x3B, 0x1F, 0xF8,
39			0x97, 0xFF, 0xDE, 0x05, 0x98, 0x0F, 0xEF, 0x2F, 0x11,
40			0x8B, 0x5A, 0x0A, 0x6D, 0x1F, 0x6D, 0x36, 0x7E, 0xCF,
41			0x27, 0xCB, 0x09, 0xB7, 0x4F, 0x46, 0x3F, 0x66, 0x9E,
42			0x5F, 0xEA, 0x2D, 0x75, 0x27, 0xBA, 0xC7, 0xEB, 0xE5,
43			0xF1, 0x7B, 0x3D, 0x07, 0x39, 0xF7, 0x8A, 0x52, 0x92,
44			0xEA, 0x6B, 0xFB, 0x5F, 0xB1, 0x1F, 0x8D, 0x5D, 0x08,
45			0x56, 0x03, 0x30, 0x46, 0xFC, 0x7B, 0x6B, 0xAB, 0xF0,
46			0xCF, 0xBC, 0x20, 0x9A, 0xF4, 0x36, 0x1D, 0xA9, 0xE3,
47			0x91, 0x61, 0x5E, 0xE6, 0x1B, 0x08, 0x65, 0x99, 0x85,
48			0x5F, 0x14, 0xA0, 0x68, 0x40, 0x8D, 0xFF, 0xD8, 0x80,
49			0x4D, 0x73, 0x27, 0x31, 0x06, 0x06, 0x15, 0x56, 0xCA,
50			0x73, 0xA8, 0xC9, 0x60, 0xE2, 0x7B, 0xC0, 0x8C, 0x6B,
51			};
52
53			/* This array is like the one in e_rem_pio2.c, but the numbers are
54			single precision and the last 8 bits are forced to 0. */
55			static const int32_t npio2_hw[] = {
56			0x3fc90f00, 0x40490f00, 0x4096cb00, 0x40c90f00, 0x40fb5300, 0x4116cb00,
57			0x412fed00, 0x41490f00, 0x41623100, 0x417b5300, 0x418a3a00, 0x4196cb00,
58			0x41a35c00, 0x41afed00, 0x41bc7e00, 0x41c90f00, 0x41d5a000, 0x41e23100,
59			0x41eec200, 0x41fb5300, 0x4203f200, 0x420a3a00, 0x42108300, 0x4216cb00,
60			0x421d1400, 0x42235c00, 0x4229a500, 0x422fed00, 0x42363600, 0x423c7e00,
61			0x4242c700, 0x42490f00
62			};
63
64			/*
65			* invpio2: 24 bits of 2/pi
66			* pio2_1: first 17 bit of pi/2
67			* pio2_1t: pi/2 - pio2_1
68			* pio2_2: second 17 bit of pi/2
69			* pio2_2t: pi/2 - (pio2_1+pio2_2)
70			* pio2_3: third 17 bit of pi/2
71			* pio2_3t: pi/2 - (pio2_1+pio2_2+pio2_3)
72			*/
73
74			static const float
75			zero = 0.0000000000e+00, /* 0x00000000 */
76			half = 5.0000000000e-01, /* 0x3f000000 */
77			two8 = 2.5600000000e+02, /* 0x43800000 */
78			invpio2 = 6.3661980629e-01, /* 0x3f22f984 */
79			pio2_1 = 1.5707855225e+00, /* 0x3fc90f80 */
80			pio2_1t = 1.0804334124e-05, /* 0x37354443 */
81			pio2_2 = 1.0804273188e-05, /* 0x37354400 */
82			pio2_2t = 6.0770999344e-11, /* 0x2e85a308 */
83			pio2_3 = 6.0770943833e-11, /* 0x2e85a300 */
84			pio2_3t = 6.1232342629e-17; /* 0x248d3132 */
85
86			int32_t
87			__ieee754_rem_pio2f(float x, float *y)
88			{
89			float z,w,t,r,fn;
90			float tx[3];
91			int32_t e0,i,j,nx,n,ix,hx;
92
93			GET_FLOAT_WORD(hx,x);
94			ix = hx&0x7fffffff;
95			if(ix<=0x3f490fd8) /* \|x\| ~<= pi/4 , no need for reduction */
96			{y[0] = x; y[1] = 0; return 0;}
97			if(ix<0x4016cbe4) { /* \|x\| < 3pi/4, special case with n=+-1 */
98			if(hx>0) {
99			z = x - pio2_1;
100			if((ix&0xfffffff0)!=0x3fc90fd0) { /* 24+24 bit pi OK */
101			y[0] = z - pio2_1t;
102			y[1] = (z-y[0])-pio2_1t;
103			} else { /* near pi/2, use 24+24+24 bit pi */
104			z -= pio2_2;
105			y[0] = z - pio2_2t;
106			y[1] = (z-y[0])-pio2_2t;
107			}
108			return 1;
109			} else { /* negative x */
110			z = x + pio2_1;
111			if((ix&0xfffffff0)!=0x3fc90fd0) { /* 24+24 bit pi OK */
112			y[0] = z + pio2_1t;
113			y[1] = (z-y[0])+pio2_1t;
114			} else { /* near pi/2, use 24+24+24 bit pi */
115			z += pio2_2;
116			y[0] = z + pio2_2t;
117			y[1] = (z-y[0])+pio2_2t;
118			}
119			return -1;
120			}
121			}
122			if(ix<=0x43490f80) { /* \|x\| ~<= 2^7(pi/2), medium size /
123			t = fabsf(x);
124			n = (int32_t) (t*invpio2+half);
125			fn = (float)n;
126			r = t-fn*pio2_1;
127			w = fnpio2_1t; / 1st round good to 40 bit */
128			if(n<32&&(ix&0xffffff00)!=npio2_hw[n-1]) {
129			y[0] = r-w; /* quick check no cancellation */
130			} else {
131			u_int32_t high;
132			j = ix>>23;
133			y[0] = r-w;
134			GET_FLOAT_WORD(high,y[0]);
135			i = j-((high>>23)&0xff);
136			if(i>8) { /* 2nd iteration needed, good to 57 */
137			t = r;
138			w = fn*pio2_2;
139			r = t-w;
140			w = fn*pio2_2t-((t-r)-w);
141			y[0] = r-w;
142			GET_FLOAT_WORD(high,y[0]);
143			i = j-((high>>23)&0xff);
144			if(i>25) { /* 3rd iteration need, 74 bits acc */
145			t = r; /* will cover all possible cases */
146			w = fn*pio2_3;
147			r = t-w;
148			w = fn*pio2_3t-((t-r)-w);
149			y[0] = r-w;
150			}
151			}
152			}
153			y[1] = (r-y[0])-w;
154			if(hx<0) {y[0] = -y[0]; y[1] = -y[1]; return -n;}
155			else return n;
156			}
157			/*
158			* all other (large) arguments
159			*/
160			if(ix>=0x7f800000) { /* x is inf or NaN */
161			y[0]=y[1]=x-x; return 0;
162			}
163			/* set z = scalbn(\|x\|,ilogb(x)-7) */
164			e0 = (ix>>23)-134; /* e0 = ilogb(z)-7; */
165			SET_FLOAT_WORD(z, ix - ((int32_t)(e0<<23)));
166			for(i=0;i<2;i++) {
167			tx[i] = (float)((int32_t)(z));
168			z = (z-tx[i])*two8;
169			}
170			tx[2] = z;
171			nx = 3;
172			while(tx[nx-1]==zero) nx--; /* skip zero term */
173			n = __kernel_rem_pio2f(tx,y,e0,nx,2,two_over_pi);
174			if(hx<0) {y[0] = -y[0]; y[1] = -y[1]; return -n;}
175			return n;
176			}