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210 lines
6.7 KiB
210 lines
6.7 KiB
15 years ago
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//C- -*- C++ -*-
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//C- -------------------------------------------------------------------
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//C- DjVuLibre-3.5
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//C- Copyright (c) 2002 Leon Bottou and Yann Le Cun.
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//C- Copyright (c) 2001 AT&T
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//C-
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//C- This software is subject to, and may be distributed under, the
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//C- GNU General Public License, Version 2. The license should have
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//C- accompanied the software or you may obtain a copy of the license
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//C- from the Free Software Foundation at http://www.fsf.org .
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//C-
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//C- This program is distributed in the hope that it will be useful,
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//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
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//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//C- GNU General Public License for more details.
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//C-
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//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library
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//C- distributed by Lizardtech Software. On July 19th 2002, Lizardtech
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//C- Software authorized us to replace the original DjVu(r) Reference
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//C- Library notice by the following text (see doc/lizard2002.djvu):
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//C-
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//C- ------------------------------------------------------------------
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//C- | DjVu (r) Reference Library (v. 3.5)
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//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
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//C- | The DjVu Reference Library is protected by U.S. Pat. No.
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//C- | 6,058,214 and patents pending.
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//C- |
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//C- | This software is subject to, and may be distributed under, the
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//C- | GNU General Public License, Version 2. The license should have
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//C- | accompanied the software or you may obtain a copy of the license
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//C- | from the Free Software Foundation at http://www.fsf.org .
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//C- |
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//C- | The computer code originally released by LizardTech under this
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//C- | license and unmodified by other parties is deemed "the LIZARDTECH
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//C- | ORIGINAL CODE." Subject to any third party intellectual property
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//C- | claims, LizardTech grants recipient a worldwide, royalty-free,
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//C- | non-exclusive license to make, use, sell, or otherwise dispose of
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//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the
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//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU
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//C- | General Public License. This grant only confers the right to
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//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to
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//C- | the extent such infringement is reasonably necessary to enable
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//C- | recipient to make, have made, practice, sell, or otherwise dispose
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//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to
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//C- | any greater extent that may be necessary to utilize further
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//C- | modifications or combinations.
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//C- |
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//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
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//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
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//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
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//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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//C- +------------------------------------------------------------------
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//
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// $Id: MMX.cpp,v 1.10 2004/05/13 16:50:10 leonb Exp $
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// $Name: release_3_5_15 $
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#if NEED_GNUG_PRAGMAS
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# pragma implementation
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#endif
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#include "MMX.h"
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_NAMESPACES
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namespace DJVU {
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# ifdef NOT_DEFINED // Just to fool emacs c++ mode
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}
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#endif
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#endif
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// ----------------------------------------
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// PRINTING MMX REGISTERS (Debug)
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#if defined(MMX) && defined(DEBUG)
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extern "C" void
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mmx_show()
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{
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/* This function can be called from a debugger
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in order to visualize the contents of the MMX registers. */
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int mmregs[16];
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MMXra( movq, mm0, &mmregs[0]);
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MMXra( movq, mm1, &mmregs[2]);
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MMXra( movq, mm2, &mmregs[4]);
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MMXra( movq, mm3, &mmregs[6]);
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MMXra( movq, mm4, &mmregs[8]);
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MMXra( movq, mm5, &mmregs[10]);
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MMXra( movq, mm6, &mmregs[12]);
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MMXra( movq, mm7, &mmregs[14]);
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MMXemms;
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for (int i=0; i<8; i++)
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DjVuPrintMessageUTF8("mm%d: %08x%08x\n", i,
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mmregs[i+i+1], mmregs[i+i]);
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MMXar( movq, &mmregs[0], mm0);
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MMXar( movq, &mmregs[2], mm1);
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MMXar( movq, &mmregs[4], mm2);
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MMXar( movq, &mmregs[6], mm3);
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MMXar( movq, &mmregs[8], mm4);
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MMXar( movq, &mmregs[10], mm5);
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MMXar( movq, &mmregs[12], mm6);
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MMXar( movq, &mmregs[14], mm7);
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}
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#endif
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// ----------------------------------------
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// MMX ENABLE/DISABLE
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// Default settings autodetect MMX.
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// Use macro DISABLE_MMX to disable MMX by default.
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#if defined(MMX) && !defined(DISABLE_MMX)
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int MMXControl::mmxflag = -1;
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#else
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int MMXControl::mmxflag = 0;
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#endif
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int
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MMXControl::disable_mmx()
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{
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mmxflag = 0;
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return mmxflag;
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}
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int
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MMXControl::enable_mmx()
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{
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int cpuflags = 0;
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#if defined(MMX) && defined(__GNUC__) && defined(__i386__)
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// Detection of MMX for GCC
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__asm__ volatile ("pushl %%ebx\n\t"
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"pushfl\n\t"
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"popl %%ecx\n\t"
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"xorl %%edx,%%edx\n\t"
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// Check that CPUID exists
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"movl %%ecx,%%eax\n\t"
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"xorl $0x200000,%%eax\n\t"
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"pushl %%eax\n\t"
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"popfl\n\t"
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"pushfl\n\t"
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"popl %%eax\n\t"
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"xorl %%ecx,%%eax\n\t"
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"jz 1f\n\t"
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"pushl %%ecx\n\t"
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"popfl\n\t"
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// Check that CR0:EM is clear
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"smsw %%ax\n\t"
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"andl $4,%%eax\n\t"
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"jnz 1f\n\t"
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// Execute CPUID
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"movl $1,%%eax\n\t"
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"cpuid\n"
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// EBX contains magic when -fPIC is on.
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"1:\tpopl %%ebx\n\t"
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"movl %%edx, %0"
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: "=m" (cpuflags) :
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: "eax","ecx","edx");
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#endif
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#if defined(MMX) && defined(_MSC_VER) && defined(_M_IX86)
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// Detection of MMX for MSVC
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__asm { pushfd
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pop ecx
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xor edx,edx
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;// Check that CPUID exists
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mov eax,ecx
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xor eax,0x200000
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push eax
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popfd
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pushfd
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pop eax
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xor eax,ecx
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jz fini
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push ecx
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popfd
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;// Check that CR0:EM is zero
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smsw ax
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and eax,4
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jnz fini
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;// Execute CPUID
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mov eax,1
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_emit 0xf
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_emit 0xa2
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fini:
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mov cpuflags,edx
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;// MSVC determines clobbered registers by scanning the assembly code.
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;// Since it does not know CPUID, it would not know that EBX is clobbered
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;// without the dummy instruction below...
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xor ebx,ebx
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}
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#endif
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mmxflag = !!(cpuflags & 0x800000);
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return mmxflag;
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}
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#ifdef HAVE_NAMESPACES
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}
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# ifndef NOT_USING_DJVU_NAMESPACE
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using namespace DJVU;
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# endif
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#endif
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