e_rem_pio2f.c

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/* 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;
}