| e_rem_pio2f.c (176550) | e_rem_pio2f.c (176552) |
|---|---|
| 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 * Debugged and optimized by Bruce D. Evans. 4 */ 5 6/* 7 * ==================================================== 8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 9 * 10 * Developed at SunPro, a Sun Microsystems, Inc. business. 11 * Permission to use, copy, modify, and distribute this 12 * software is freely granted, provided that this notice 13 * is preserved. 14 * ==================================================== 15 */ 16 17#include <sys/cdefs.h> | 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 * Debugged and optimized by Bruce D. Evans. 4 */ 5 6/* 7 * ==================================================== 8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 9 * 10 * Developed at SunPro, a Sun Microsystems, Inc. business. 11 * Permission to use, copy, modify, and distribute this 12 * software is freely granted, provided that this notice 13 * is preserved. 14 * ==================================================== 15 */ 16 17#include <sys/cdefs.h> |
| 18__FBSDID("$FreeBSD: head/lib/msun/src/e_rem_pio2f.c 176550 2008-02-25 11:43:20Z bde $"); | 18__FBSDID("$FreeBSD: head/lib/msun/src/e_rem_pio2f.c 176552 2008-02-25 13:33:20Z bde $"); |
| 19 20/* __ieee754_rem_pio2f(x,y) 21 * | 19 20/* __ieee754_rem_pio2f(x,y) 21 * |
| 22 * return the remainder of x rem pi/2 in y[0]+y[1] 23 * use double precision internally | 22 * return the remainder of x rem pi/2 in *y 23 * use double precision for everything except passing x |
| 24 * use __kernel_rem_pio2() for large x 25 */ 26 27#include <float.h> 28 29#include "math.h" 30#include "math_private.h" 31 --- 5 unchanged lines hidden (view full) --- 37 38static const double 39half = 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */ 40invpio2 = 6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */ 41pio2_1 = 1.57079632673412561417e+00, /* 0x3FF921FB, 0x54400000 */ 42pio2_1t = 6.07710050650619224932e-11; /* 0x3DD0B461, 0x1A626331 */ 43 44int | 24 * use __kernel_rem_pio2() for large x 25 */ 26 27#include <float.h> 28 29#include "math.h" 30#include "math_private.h" 31 --- 5 unchanged lines hidden (view full) --- 37 38static const double 39half = 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */ 40invpio2 = 6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */ 41pio2_1 = 1.57079632673412561417e+00, /* 0x3FF921FB, 0x54400000 */ 42pio2_1t = 6.07710050650619224932e-11; /* 0x3DD0B461, 0x1A626331 */ 43 44int |
| 45__ieee754_rem_pio2f(float x, float *y) | 45__ieee754_rem_pio2f(float x, double *y) |
| 46{ 47 double w,r,fn; | 46{ 47 double w,r,fn; |
| 48 double tx[1],ty[1]; | 48 double tx[1]; |
| 49 float z; 50 int32_t e0,n,ix,hx; 51 52 GET_FLOAT_WORD(hx,x); 53 ix = hx&0x7fffffff; 54 /* 33+53 bit pi is good enough for medium size */ 55 if(ix<=0x49490f80) { /* |x| ~<= 2^19*(pi/2), medium size */ 56 /* Use a specialized rint() to get fn. Assume round-to-nearest. */ 57 STRICT_ASSIGN(double,fn,x*invpio2+0x1.8p52); 58 fn = fn-0x1.8p52; 59#ifdef HAVE_EFFICIENT_IRINT 60 n = irint(fn); 61#else 62 n = (int32_t)fn; 63#endif 64 r = x-fn*pio2_1; 65 w = fn*pio2_1t; | 49 float z; 50 int32_t e0,n,ix,hx; 51 52 GET_FLOAT_WORD(hx,x); 53 ix = hx&0x7fffffff; 54 /* 33+53 bit pi is good enough for medium size */ 55 if(ix<=0x49490f80) { /* |x| ~<= 2^19*(pi/2), medium size */ 56 /* Use a specialized rint() to get fn. Assume round-to-nearest. */ 57 STRICT_ASSIGN(double,fn,x*invpio2+0x1.8p52); 58 fn = fn-0x1.8p52; 59#ifdef HAVE_EFFICIENT_IRINT 60 n = irint(fn); 61#else 62 n = (int32_t)fn; 63#endif 64 r = x-fn*pio2_1; 65 w = fn*pio2_1t; |
| 66 y[0] = r-w; 67 y[1] = (r-y[0])-w; | 66 *y = r-w; |
| 68 return n; 69 } 70 /* 71 * all other (large) arguments 72 */ 73 if(ix>=0x7f800000) { /* x is inf or NaN */ | 67 return n; 68 } 69 /* 70 * all other (large) arguments 71 */ 72 if(ix>=0x7f800000) { /* x is inf or NaN */ |
| 74 y[0]=y[1]=x-x; return 0; | 73 *y=x-x; return 0; |
| 75 } 76 /* set z = scalbn(|x|,ilogb(|x|)-23) */ 77 e0 = (ix>>23)-150; /* e0 = ilogb(|x|)-23; */ 78 SET_FLOAT_WORD(z, ix - ((int32_t)(e0<<23))); 79 tx[0] = z; | 74 } 75 /* set z = scalbn(|x|,ilogb(|x|)-23) */ 76 e0 = (ix>>23)-150; /* e0 = ilogb(|x|)-23; */ 77 SET_FLOAT_WORD(z, ix - ((int32_t)(e0<<23))); 78 tx[0] = z; |
| 80 n = __kernel_rem_pio2(tx,ty,e0,1,0); 81 y[0] = ty[0]; 82 y[1] = ty[0] - y[0]; 83 if(hx<0) {y[0] = -y[0]; y[1] = -y[1]; return -n;} | 79 n = __kernel_rem_pio2(tx,y,e0,1,0); 80 if(hx<0) {*y = -*y; return -n;} |
| 84 return n; 85} | 81 return n; 82} |