//C- -*- C++ -*-
//C- -------------------------------------------------------------------
//C- DjVuLibre-3.5
//C- Copyright (c) 2002 Leon Bottou and Yann Le Cun.
//C- Copyright (c) 2001 AT&T
//C-
//C- This software is subject to, and may be distributed under, the
//C- GNU General Public License, either Version 2 of the license,
//C- or (at your option) any later version. The license should have
//C- accompanied the software or you may obtain a copy of the license
//C- from the Free Software Foundation at http://www.fsf.org .
//C-
//C- This program is distributed in the hope that it will be useful,
//C- but WITHOUT ANY WARRANTY; without even the implied warranty of
//C- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//C- GNU General Public License for more details.
//C-
//C- DjVuLibre-3.5 is derived from the DjVu(r) Reference Library from
//C- Lizardtech Software. Lizardtech Software has authorized us to
//C- replace the original DjVu(r) Reference Library notice by the following
//C- text (see doc/lizard2002.djvu and doc/lizardtech2007.djvu):
//C-
//C- ------------------------------------------------------------------
//C- | DjVu (r) Reference Library (v. 3.5)
//C- | Copyright (c) 1999-2001 LizardTech, Inc. All Rights Reserved.
//C- | The DjVu Reference Library is protected by U.S. Pat. No.
//C- | 6,058,214 and patents pending.
//C- |
//C- | This software is subject to, and may be distributed under, the
//C- | GNU General Public License, either Version 2 of the license,
//C- | or (at your option) any later version. The license should have
//C- | accompanied the software or you may obtain a copy of the license
//C- | from the Free Software Foundation at http://www.fsf.org .
//C- |
//C- | The computer code originally released by LizardTech under this
//C- | license and unmodified by other parties is deemed "the LIZARDTECH
//C- | ORIGINAL CODE." Subject to any third party intellectual property
//C- | claims, LizardTech grants recipient a worldwide, royalty-free,
//C- | non-exclusive license to make, use, sell, or otherwise dispose of
//C- | the LIZARDTECH ORIGINAL CODE or of programs derived from the
//C- | LIZARDTECH ORIGINAL CODE in compliance with the terms of the GNU
//C- | General Public License. This grant only confers the right to
//C- | infringe patent claims underlying the LIZARDTECH ORIGINAL CODE to
//C- | the extent such infringement is reasonably necessary to enable
//C- | recipient to make, have made, practice, sell, or otherwise dispose
//C- | of the LIZARDTECH ORIGINAL CODE (or portions thereof) and not to
//C- | any greater extent that may be necessary to utilize further
//C- | modifications or combinations.
//C- |
//C- | The LIZARDTECH ORIGINAL CODE is provided "AS IS" WITHOUT WARRANTY
//C- | OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
//C- | TO ANY WARRANTY OF NON-INFRINGEMENT, OR ANY IMPLIED WARRANTY OF
//C- | MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
//C- +------------------------------------------------------------------
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#if NEED_GNUG_PRAGMAS
# pragma implementation
#endif
#include "MMX.h"
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#ifdef HAVE_NAMESPACES
namespace DJVU {
# ifdef NOT_DEFINED // Just to fool emacs c++ mode
}
#endif
#endif
// ----------------------------------------
// PRINTING MMX REGISTERS (Debug)
#if defined(MMX) && defined(DEBUG)
extern "C" void
mmx_show()
{
/* This function can be called from a debugger
in order to visualize the contents of the MMX registers. */
int mmregs[16];
MMXra( movq, mm0, &mmregs[0]);
MMXra( movq, mm1, &mmregs[2]);
MMXra( movq, mm2, &mmregs[4]);
MMXra( movq, mm3, &mmregs[6]);
MMXra( movq, mm4, &mmregs[8]);
MMXra( movq, mm5, &mmregs[10]);
MMXra( movq, mm6, &mmregs[12]);
MMXra( movq, mm7, &mmregs[14]);
MMXemms;
for (int i=0; i<8; i++)
DjVuPrintMessageUTF8("mm%d: %08x%08x\n", i,
mmregs[i+i+1], mmregs[i+i]);
MMXar( movq, &mmregs[0], mm0);
MMXar( movq, &mmregs[2], mm1);
MMXar( movq, &mmregs[4], mm2);
MMXar( movq, &mmregs[6], mm3);
MMXar( movq, &mmregs[8], mm4);
MMXar( movq, &mmregs[10], mm5);
MMXar( movq, &mmregs[12], mm6);
MMXar( movq, &mmregs[14], mm7);
}
#endif
// ----------------------------------------
// MMX ENABLE/DISABLE
// Default settings autodetect MMX.
// Use macro DISABLE_MMX to disable MMX by default.
#if defined(MMX) && !defined(DISABLE_MMX)
int MMXControl::mmxflag = -1;
#else
int MMXControl::mmxflag = 0;
#endif
int
MMXControl::disable_mmx()
{
mmxflag = 0;
return mmxflag;
}
int
MMXControl::enable_mmx()
{
int cpuflags = 0;
const char *envvar = getenv("LIBDJVU_DISABLE_MMX");
if (envvar && envvar[0] && envvar[0]!='0')
return ((mmxflag = 0));
#if defined(MMX) && defined(__GNUC__) && defined(__i386__)
// Detection of MMX for GCC
__asm__ volatile ("pushl %%ebx\n\t"
"pushfl\n\t"
"popl %%ecx\n\t"
"xorl %%edx,%%edx\n\t"
// Check that CPUID exists
"movl %%ecx,%%eax\n\t"
"xorl $0x200000,%%eax\n\t"
"pushl %%eax\n\t"
"popfl\n\t"
"pushfl\n\t"
"popl %%eax\n\t"
"xorl %%ecx,%%eax\n\t"
"jz 1f\n\t"
"pushl %%ecx\n\t"
"popfl\n\t"
// Check that CR0:EM is clear
"smsw %%ax\n\t"
"andl $4,%%eax\n\t"
"jnz 1f\n\t"
// Execute CPUID
"movl $1,%%eax\n\t"
"cpuid\n"
// EBX contains magic when -fPIC is on.
"1:\tpopl %%ebx\n\t"
"movl %%edx, %0"
: "=m" (cpuflags) :
: "eax","ecx","edx");
#endif
#if defined(MMX) && defined(__GNUC__) && defined(__x86_64__)
// Detection of MMX for GCC
__asm__ volatile (// Check that CR0:EM is clear
"xorl %%edx,%%edx\n\t"
"smsw %%ax\n\t"
"andl $4,%%eax\n\t"
"jnz 1f\n\t"
// Execute CPUID
"movl $1,%%eax\n\t"
"cpuid\n"
// Finish
"1:\tmovl %%edx, %0"
: "=m" (cpuflags) :
: "eax","ebx","ecx","edx");
#endif
#if defined(MMX) && defined(_MSC_VER) && defined(_M_IX86)
// Detection of MMX for MSVC 32 bits
__asm { pushfd
pop ecx
xor edx,edx
;// Check that CPUID exists
mov eax,ecx
xor eax,0x200000
push eax
popfd
pushfd
pop eax
xor eax,ecx
jz fini
push ecx
popfd
;// Check that CR0:EM is zero
smsw ax
and eax,4
jnz fini
;// Execute CPUID
mov eax,1
_emit 0xf
_emit 0xa2
fini:
mov cpuflags,edx
;// MSVC determines clobbered registers by scanning the assembly code.
;// Since it does not know CPUID, it would not know that EBX is clobbered
;// without the dummy instruction below...
xor ebx,ebx
}
#endif
mmxflag = !!(cpuflags & 0x800000);
return mmxflag;
}
#ifdef HAVE_NAMESPACES
}
# ifndef NOT_USING_DJVU_NAMESPACE
using namespace DJVU;
# endif
#endif