/* * Copyright (c) 2002 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * The contents of this file constitute Original Code as defined in and * are subject to the Apple Public Source License Version 1.1 (the * "License"). You may not use this file except in compliance with the * License. Please obtain a copy of the License at * http://www.apple.com/publicsource and read it before using this file. * * This 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 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 * * * *******************************************************************************/ #include "math.h" #include "fp_private.h" #include "fenv_private.h" static const double twoTo52 = 0x1.0p+52; // 4503599627370496.0; static const float twoTo23 = 0x1.0p+23; // 8388608.0; /******************************************************************************* * Ceil(x) returns the smallest integer not less than x. * *******************************************************************************/ double ceil ( double x ) { register double y; register int target; register double FPR_absx, FPR_Two52, FPR_one, FPR_zero, FPR_Mzero, FPR_pi4; FPR_absx = __FABS( x ); FPR_zero = 0.0; FPR_Two52 = twoTo52; FPR_one = 1.0; __ENSURE( FPR_zero, FPR_Two52, FPR_one ); FPR_pi4 = M_PI_4; FPR_Mzero = -0.0; target = ( x > FPR_zero ); __ENSURE( FPR_Mzero, FPR_Two52, FPR_pi4 ); if (likely( FPR_absx < FPR_Two52 )) /******************************************************************************* * Is |x| < 2.0^52? * *******************************************************************************/ { if ( FPR_absx < FPR_one ) /******************************************************************************* * Is |x| < 1.0? * *******************************************************************************/ { if ( x == FPR_zero ) // zero x is exact case return ( x ); else { // inexact case __PROG_INEXACT( FPR_pi4 ); if ( target ) return ( FPR_one ); else return ( FPR_Mzero ); } } /******************************************************************************* * Is 1.0 < |x| < 2.0^52? * *******************************************************************************/ if ( target ) { y = ( x + FPR_Two52 ) - FPR_Two52; // round at binary pt. if ( y < x ) return ( y + FPR_one ); else return ( y ); } else { y = ( x - FPR_Two52 ) + FPR_Two52; // round at binary pt. if ( y < x ) return ( y + FPR_one ); else return ( y ); } } /******************************************************************************* * |x| >= 2.0^52 or x is a NaN. * *******************************************************************************/ return ( x ); } float ceilf ( float x ) { register float y; register int target; register float FPR_absx, FPR_Two23, FPR_one, FPR_zero, FPR_Mzero; register double FPR_pi4; FPR_absx = __FABS( x ); FPR_zero = 0.0f; FPR_Two23 = twoTo23; FPR_one = 1.0; __ENSURE( FPR_zero, FPR_Two23, FPR_one ); FPR_pi4 = M_PI_4; FPR_Mzero = -0.0f; target = ( x > FPR_zero ); __ENSURE( FPR_Mzero, FPR_Two23, FPR_pi4 ); if (likely( FPR_absx < FPR_Two23 )) /******************************************************************************* * Is |x| < 2.0^23? * *******************************************************************************/ { if ( FPR_absx < FPR_one ) /******************************************************************************* * Is |x| < 1.0? * *******************************************************************************/ { if ( x == FPR_zero ) // zero x is exact case return ( x ); else { // inexact case __PROG_INEXACT( FPR_pi4 ); if ( target ) return ( FPR_one ); else return ( FPR_Mzero ); } } /******************************************************************************* * Is 1.0 < |x| < 2.0^23? * *******************************************************************************/ if ( target ) { y = ( x + FPR_Two23 ) - FPR_Two23; // round at binary pt. if ( y < x ) return ( y + FPR_one ); else return ( y ); } else { y = ( x - FPR_Two23 ) + FPR_Two23; // round at binary pt. if ( y < x ) return ( y + FPR_one ); 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 ) { register double y; register int target; register double FPR_absx, FPR_Two52, FPR_one, FPR_zero, FPR_Mone, FPR_pi4; FPR_absx = __FABS( x ); FPR_zero = 0.0; FPR_Two52 = twoTo52; FPR_one = 1.0; __ENSURE( FPR_zero, FPR_Two52, FPR_one ); FPR_pi4 = M_PI_4; FPR_Mone = -1.0; target = ( x > FPR_zero ); __ENSURE( FPR_Mone, FPR_zero, FPR_pi4 ); if (likely( FPR_absx < FPR_Two52 )) /******************************************************************************* * Is |x| < 2.0^52? * *******************************************************************************/ { if ( FPR_absx < FPR_one ) /******************************************************************************* * Is |x| < 1.0? * *******************************************************************************/ { if ( x == FPR_zero ) // zero x is exact case return ( x ); else { // inexact case __PROG_INEXACT( FPR_pi4 ); if ( target ) return ( FPR_zero ); else return ( FPR_Mone ); } } /******************************************************************************* * Is 1.0 < |x| < 2.0^52? * *******************************************************************************/ if ( target ) { y = ( x + FPR_Two52 ) - FPR_Two52; // round at binary pt. if ( y > x ) return ( y - FPR_one ); else return ( y ); } else { y = ( x - FPR_Two52 ) + FPR_Two52; // round at binary pt. if ( y > x ) return ( y - FPR_one ); else return ( y ); } } /******************************************************************************* * |x| >= 2.0^52 or x is a NaN. * *******************************************************************************/ return ( x ); } float floorf ( float x ) { register float y; register int target; register float FPR_absx, FPR_Two23, FPR_one, FPR_zero, FPR_Mone; register double FPR_pi4; FPR_absx = __FABS( x ); FPR_zero = 0.0f; FPR_Two23 = twoTo23; FPR_one = 1.0f; __ENSURE( FPR_zero, FPR_Two23, FPR_one ); FPR_pi4 = M_PI_4; FPR_Mone = -1.0f; target = ( x > FPR_zero ); __ENSURE( FPR_Mone, FPR_zero, FPR_pi4 ); if (likely( FPR_absx < FPR_Two23 )) /******************************************************************************* * Is |x| < 2.0^23? * *******************************************************************************/ { if ( FPR_absx < FPR_one ) /******************************************************************************* * Is |x| < 1.0? * *******************************************************************************/ { if ( x == FPR_zero ) // zero x is exact case return ( x ); else { // inexact case __PROG_INEXACT( FPR_pi4 ); if ( target ) return ( FPR_zero ); else return ( FPR_Mone ); } } /******************************************************************************* * Is 1.0 < |x| < 2.0^23? * *******************************************************************************/ if ( target ) { y = ( x + FPR_Two23 ) - FPR_Two23; // round at binary pt. if ( y > x ) return ( y - FPR_one ); else return ( y ); } else { y = ( x - FPR_Two23 ) + FPR_Two23; // round at binary pt. if ( y > x ) return ( y - FPR_one ); else return ( y ); } } /******************************************************************************* * |x| >= 2.0^23 or x is a NaN. * *******************************************************************************/ return ( x ); }