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7e5585aaca
This is a bit more consistent with the naming of the other header files (openlibm_complex.h and openlibm_fenv.h). Re-add an openlibm.h header that includes all of the public headers as a shorthand. Fix up all of the source files to include <openlibm_math.h> instead of <openlibm.h>. While there, fix ordering of the includes.
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* e_rem_pio2f.c -- float version of e_rem_pio2.c
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* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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* Debugged and optimized by Bruce D. Evans.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#include "cdefs-compat.h"
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//__FBSDID("$FreeBSD: src/lib/msun/src/e_rem_pio2f.c,v 1.32 2009/06/03 08:16:34 ed Exp $");
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/* __ieee754_rem_pio2f(x,y)
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*
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* return the remainder of x rem pi/2 in *y
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* use double precision for everything except passing x
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* use __kernel_rem_pio2() for large x
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*/
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#include <float.h>
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#include <openlibm_math.h>
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#include "math_private.h"
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/*
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* invpio2: 53 bits of 2/pi
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* pio2_1: first 33 bit of pi/2
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* pio2_1t: pi/2 - pio2_1
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*/
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static const double
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invpio2 = 6.36619772367581382433e-01, /* 0x3FE45F30, 0x6DC9C883 */
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pio2_1 = 1.57079631090164184570e+00, /* 0x3FF921FB, 0x50000000 */
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pio2_1t = 1.58932547735281966916e-08; /* 0x3E5110b4, 0x611A6263 */
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__inline int
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__ieee754_rem_pio2f(float x, double *y)
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{
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double w,r,fn;
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double tx[1],ty[1];
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float z;
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int32_t e0,n,ix,hx;
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GET_FLOAT_WORD(hx,x);
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ix = hx&0x7fffffff;
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/* 33+53 bit pi is good enough for medium size */
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if(ix<0x4dc90fdb) { /* |x| ~< 2^28*(pi/2), medium size */
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/* Use a specialized rint() to get fn. Assume round-to-nearest. */
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STRICT_ASSIGN(double,fn,x*invpio2+0x1.8p52);
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fn = fn-0x1.8p52;
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#ifdef HAVE_EFFICIENT_IRINT
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n = irint(fn);
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#else
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n = (int32_t)fn;
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#endif
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r = x-fn*pio2_1;
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w = fn*pio2_1t;
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*y = r-w;
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return n;
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}
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/*
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* all other (large) arguments
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*/
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if(ix>=0x7f800000) { /* x is inf or NaN */
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*y=x-x; return 0;
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}
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/* set z = scalbn(|x|,ilogb(|x|)-23) */
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e0 = (ix>>23)-150; /* e0 = ilogb(|x|)-23; */
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SET_FLOAT_WORD(z, ix - ((int32_t)(e0<<23)));
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tx[0] = z;
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n = __kernel_rem_pio2(tx,ty,e0,1,0);
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if(hx<0) {*y = -ty[0]; return -n;}
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*y = ty[0]; return n;
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}
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