| e_rem_pio2f.c (176569) | e_rem_pio2f.c (176640) |
|---|---|
| 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 176569 2008-02-25 22:19:17Z bde $"); | 18__FBSDID("$FreeBSD: head/lib/msun/src/e_rem_pio2f.c 176640 2008-02-28 16:22:36Z bde $"); |
| 19 20/* __ieee754_rem_pio2f(x,y) 21 * 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 --- 6 unchanged lines hidden (view full) --- 33 * invpio2: 53 bits of 2/pi 34 * pio2_1: first 33 bit of pi/2 35 * pio2_1t: pi/2 - pio2_1 36 */ 37 38static const double 39half = 5.00000000000000000000e-01, /* 0x3FE00000, 0x00000000 */ 40invpio2 = 6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */ | 19 20/* __ieee754_rem_pio2f(x,y) 21 * 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 --- 6 unchanged lines hidden (view full) --- 33 * invpio2: 53 bits of 2/pi 34 * pio2_1: first 33 bit of pi/2 35 * pio2_1t: pi/2 - pio2_1 36 */ 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 */ | 41pio2_1 = 1.57079631090164184570e+00, /* 0x3FF921FB, 0x50000000 */ 42pio2_1t = 1.58932547735281966916e-08; /* 0x3E5110b4, 0x611A6263 */ |
| 43 44#ifdef INLINE_REM_PIO2F 45extern inline 46#endif 47int 48__ieee754_rem_pio2f(float x, double *y) 49{ 50 double w,r,fn; 51 double tx[1],ty[1]; 52 float z; 53 int32_t e0,n,ix,hx; 54 55 GET_FLOAT_WORD(hx,x); 56 ix = hx&0x7fffffff; 57 /* 33+53 bit pi is good enough for medium size */ | 43 44#ifdef INLINE_REM_PIO2F 45extern inline 46#endif 47int 48__ieee754_rem_pio2f(float x, double *y) 49{ 50 double w,r,fn; 51 double tx[1],ty[1]; 52 float z; 53 int32_t e0,n,ix,hx; 54 55 GET_FLOAT_WORD(hx,x); 56 ix = hx&0x7fffffff; 57 /* 33+53 bit pi is good enough for medium size */ |
| 58 if(ix<=0x49490f80) { /* |x| ~<= 2^19*(pi/2), medium size */ | 58 if(ix<0x4dc90fdb) { /* |x| ~< 2^28*(pi/2), medium size */ |
| 59 /* Use a specialized rint() to get fn. Assume round-to-nearest. */ 60 STRICT_ASSIGN(double,fn,x*invpio2+0x1.8p52); 61 fn = fn-0x1.8p52; 62#ifdef HAVE_EFFICIENT_IRINT 63 n = irint(fn); 64#else 65 n = (int32_t)fn; 66#endif --- 19 unchanged lines hidden --- | 59 /* Use a specialized rint() to get fn. Assume round-to-nearest. */ 60 STRICT_ASSIGN(double,fn,x*invpio2+0x1.8p52); 61 fn = fn-0x1.8p52; 62#ifdef HAVE_EFFICIENT_IRINT 63 n = irint(fn); 64#else 65 n = (int32_t)fn; 66#endif --- 19 unchanged lines hidden --- |