/* * Copyright (c) 2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /******************************************************************************* * * * File ceilfloor.c, * * Function ceil(x) and floor(x), * * Implementation of ceil and floor for the PowerPC. * * * * Copyright © 1991-2001 Apple Computer, Inc. All rights reserved. * * * * Written by Ali Sazegari, started on November 1991, * * Modified and ported by Robert A. Murley (ram) for Mac OS X. * * * * A MathLib v4 file. * * * * December 03 1992: first rs6000 port. * * July 14 1993: comment changes and addition of #pragma fenv_access. * * May 06 1997: port of the ibm/taligent ceil and floor routines. * * April 11 2001: first port to os x using gcc. * * June 13 2001: replaced __setflm with fegetenvd/fesetenvd; * * replaced DblInHex typedef with hexdouble. * * used standard exception symbols from fenv.h. * * Sept 06 2001: added #ifdef __ppc__. * * Sept 09 2001: added more comments. * * Sept 10 2001: added macros to detect PowerPC and correct compiler. * * Sept 17 2001: deleted "fp.h" and changed "fenv.h" to <fenv.h>. * * Sept 18 2001: added <CoreServices/CoreServices.h> to get <fenv.h>. * * October 08 2001: removed <CoreServices/CoreServices.h>. * * changed compiler errors to warnings. * * November 06 2001: commented out warning about Intel architectures. * * * * W A R N I N G: * * These routines require a 64-bit double precision IEEE-754 model. * * They are written for PowerPC only and are expecting the compiler * * to generate the correct sequence of multiply-add fused instructions. * * * * These routines are not intended for 32-bit Intel architectures. * * * * A version of gcc higher than 932 is required. * * * * GCC compiler options: * * optimization level 3 (-O3) * * -fschedule-insns -finline-functions -funroll-all-loops * * * *******************************************************************************/ #ifdef __APPLE_CC__ #if __APPLE_CC__ > 930 #include "fp_private.h" #include "fenv_private.h" static const double twoTo52 = 4503599627370496.0; static const float twoTo23 = 8388608.0; /******************************************************************************* * Ceil(x) returns the smallest integer not less than x. * *******************************************************************************/ double ceil ( double x ) { hexdouble xInHex, OldEnvironment; register double y; register unsigned long int xhi; register int target; xInHex.d = x; xhi = xInHex.i.hi & 0x7fffffff; // xhi is the high half of |x| target = ( xInHex.i.hi < 0x80000000 ); if ( xhi < 0x43300000ul ) /******************************************************************************* * Is |x| < 2.0^52? * *******************************************************************************/ { if ( xhi < 0x3ff00000 ) /******************************************************************************* * Is |x| < 1.0? * *******************************************************************************/ { if ( ( xhi | xInHex.i.lo ) == 0ul ) // zero x is exact case return ( x ); else { // inexact case fegetenvd( OldEnvironment.d ); OldEnvironment.i.lo |= FE_INEXACT; fesetenvd( OldEnvironment.d ); if ( target ) return ( 1.0 ); else return ( -0.0 ); } } /******************************************************************************* * Is 1.0 < |x| < 2.0^52? * *******************************************************************************/ if ( target ) { y = ( x + twoTo52 ) - twoTo52; // round at binary pt. if ( y < x ) return ( y + 1.0 ); else return ( y ); } else { y = ( x - twoTo52 ) + twoTo52; // round at binary pt. if ( y < x ) return ( y + 1.0 ); else return ( y ); } } /******************************************************************************* * |x| >= 2.0^52 or x is a NaN. * *******************************************************************************/ return ( x ); } float ceilf ( float x ) { hexdouble OldEnvironment; hexsingle xInHex; register float y; register unsigned long int xhi; register int target; xInHex.fval = x; xhi = xInHex.lval & 0x7fffffff; // xhi is |x| target = ( xInHex.lval < 0x80000000 ); if ( xhi < 0x4b000000ul ) /******************************************************************************* * Is |x| < 2.0^23? * *******************************************************************************/ { if ( xhi < 0x3f800000 ) /******************************************************************************* * Is |x| < 1.0? * *******************************************************************************/ { if ( xhi == 0ul ) // zero x is exact case return ( x ); else { // inexact case fegetenvd( OldEnvironment.d ); OldEnvironment.i.lo |= FE_INEXACT; fesetenvd( OldEnvironment.d ); if ( target ) return ( 1.0 ); else #if (__GNUC__>=3) return ( -0.0 ); #else /* workaround gcc 2.x botch of -0 return. */ { volatile hexsingle zInHex; zInHex.lval = 0x80000000; return zInHex.fval; } #endif } } /******************************************************************************* * Is 1.0 < |x| < 2.0^23? * *******************************************************************************/ if ( target ) { y = ( x + twoTo23 ) - twoTo23; // round at binary pt. if ( y < x ) return ( y + 1.0 ); else return ( y ); } else { y = ( x - twoTo23 ) + twoTo23; // round at binary pt. if ( y < x ) return ( y + 1.0 ); else return ( y ); } } /******************************************************************************* * |x| >= 2.0^23 or x is a NaN. * *******************************************************************************/ return ( x ); } /******************************************************************************* * Floor(x) returns the largest integer not greater than x. * *******************************************************************************/ double floor ( double x ) { hexdouble xInHex, OldEnvironment; register double y; register unsigned long int xhi; register long int target; xInHex.d = x; xhi = xInHex.i.hi & 0x7fffffff; // xhi is the high half of |x| target = ( xInHex.i.hi < 0x80000000 ); if ( xhi < 0x43300000ul ) /******************************************************************************* * Is |x| < 2.0^52? * *******************************************************************************/ { if ( xhi < 0x3ff00000 ) /******************************************************************************* * Is |x| < 1.0? * *******************************************************************************/ { if ( ( xhi | xInHex.i.lo ) == 0ul ) // zero x is exact case return ( x ); else { // inexact case fegetenvd( OldEnvironment.d ); OldEnvironment.i.lo |= FE_INEXACT; fesetenvd( OldEnvironment.d ); if ( target ) return ( 0.0 ); else return ( -1.0 ); } } /******************************************************************************* * Is 1.0 < |x| < 2.0^52? * *******************************************************************************/ if ( target ) { y = ( x + twoTo52 ) - twoTo52; // round at binary pt. if ( y > x ) return ( y - 1.0 ); else return ( y ); } else { y = ( x - twoTo52 ) + twoTo52; // round at binary pt. if ( y > x ) return ( y - 1.0 ); else return ( y ); } } /******************************************************************************* * |x| >= 2.0^52 or x is a NaN. * *******************************************************************************/ return ( x ); } float floorf ( float x ) { hexdouble OldEnvironment; hexsingle xInHex; register float y; register unsigned long int xhi; register long int target; xInHex.fval = x; xhi = xInHex.lval & 0x7fffffff; // xhi is |x| target = ( xInHex.lval < 0x80000000 ); if ( xhi < 0x4b000000ul ) /******************************************************************************* * Is |x| < 2.0^23? * *******************************************************************************/ { if ( xhi < 0x3f800000 ) /******************************************************************************* * Is |x| < 1.0? * *******************************************************************************/ { if ( xhi == 0ul ) // zero x is exact case return ( x ); else { // inexact case fegetenvd( OldEnvironment.d ); OldEnvironment.i.lo |= FE_INEXACT; fesetenvd( OldEnvironment.d ); if ( target ) return ( 0.0 ); else return ( -1.0 ); } } /******************************************************************************* * Is 1.0 < |x| < 2.0^23? * *******************************************************************************/ if ( target ) { y = ( x + twoTo23 ) - twoTo23; // round at binary pt. if ( y > x ) return ( y - 1.0 ); else return ( y ); } else { y = ( x - twoTo23 ) + twoTo23; // round at binary pt. if ( y > x ) return ( y - 1.0 ); else return ( y ); } } /******************************************************************************* * |x| >= 2.0^23 or x is a NaN. * *******************************************************************************/ return ( x ); } #else /* __APPLE_CC__ version */ #warning A higher version than gcc-932 is required. #endif /* __APPLE_CC__ version */ #endif /* __APPLE_CC__ */