/* * 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: fabs.c * * * * Contains: C99 fabs * * * * Copyright © 2001 Apple Computer, Inc. All rights reserved. * * * * Written by Stephen C. Peters, started in November 2001. * * * * A MathLib v5 file. * * * * Change History (most recent first): * * * * 21 Nov 01 scp First created. * * * * 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 /* * fabs(x) returns the absolute value of x. */ /* gcc 2.95 inlines fabs() and fabsf() of its own accord. But in case we ever get here ... */ #define __FABS(x) \ ({ \ double __value, __arg = (x); \ asm volatile ("fabs %0,%1" : "=f" (__value): "f" (__arg)); \ __value; \ }) #define __FABSF(x) \ ({ \ float __value, __arg = (x); \ asm volatile ("fabs %0,%1" : "=f" (__value): "f" (__arg)); \ __value; \ }) double fabs(double x) { return __FABS(x); } float fabsf(float x) { return __FABSF(x); } #else /* __APPLE_CC__ version */ #error Version gcc-932 or higher required. Compilation terminated. #endif /* __APPLE_CC__ version */ #endif /* __APPLE_CC__ */