0058967bb0
2006-01-31 Richard Guenther <rguenther@suse.de> Paolo Bonzini <bonzini@gnu.org> * Makefile.def (target_modules): Add libgcc-math target module. * configure.in (target_libraries): Add libgcc-math target library. (--enable-libgcc-math): New configure switch. * Makefile.in: Re-generate. * configure: Re-generate. * libgcc-math: New toplevel directory. * doc/install.texi (--disable-libgcc-math): Document. libgcc-math/ * configure.ac: New file. * Makefile.am: Likewise. * configure: New generated file. * Makefile.in: Likewise. * aclocal.m4: Likewise. * libtool-version: New file. * include/ieee754.h: New file. * include/libc-symbols.h: Likewise. * include/math_private.h: Likewise. * i386/Makefile.am: New file. * i386/Makefile.in: New generated file. * i386/sse2.h: New file. * i386/endian.h: Likewise. * i386/sse2.map: Linker script for SSE2 ABI math intrinsics. * flt-32/: Import from glibc. * dbl-64/: Likewise. Co-Authored-By: Paolo Bonzini <bonzini@gnu.org> From-SVN: r110434
61 lines
2.7 KiB
C
61 lines
2.7 KiB
C
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/*
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* IBM Accurate Mathematical Library
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* written by International Business Machines Corp.
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* Copyright (C) 2001 Free Software Foundation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/**********************************************************************/
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/* MODULE_NAME:mptan.c */
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/* */
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/* FUNCTION: mptan */
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/* */
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/* FILES NEEDED: endian.h mpa.h */
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/* mpa.c sincos32.c branred.c */
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/* */
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/* Multi-Precision tan() function subroutine, for p=32. It is based */
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/* on the routines mpranred() and c32(). mpranred() performs range */
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/* reduction of a double number x into a multiple precision number */
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/* y, such that y=x-n*pi/2, abs(y)<pi/4, n=0,+-1,+-2,.... c32() */
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/* computes both sin(y), cos(y). tan(x) is either sin(y)/cos(y) */
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/* or -cos(y)/sin(y). The precision of the result is of about 559 */
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/* significant bits. */
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/* */
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/**********************************************************************/
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#include "endian.h"
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#include "mpa.h"
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int __mpranred(double, mp_no *, int);
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void __c32(mp_no *, mp_no *, mp_no *, int);
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void __mptan(double x, mp_no *mpy, int p) {
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static const double Mone = -1.0;
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int n;
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mp_no mpw, mpc, mps;
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n = __mpranred(x, &mpw, p) & 0x00000001; /* negative or positive result */
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__c32(&mpw, &mpc, &mps, p); /* computing sin(x) and cos(x) */
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if (n) /* second or fourth quarter of unit circle */
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{ __dvd(&mpc,&mps,mpy,p);
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mpy->d[0] *= Mone;
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} /* tan is negative in this area */
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else __dvd(&mps,&mpc,mpy,p);
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return;
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}
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