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{
This file is part of the Free Pascal run time library.
Copyright (c) 1999-2000 by Florian Klaempfl
member of the Free Pascal development team
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
**********************************************************************}
{ This unit contains some helpful stuff to deal with the mmx extensions }
unit mmx;
interface
type
tmmxshortint = array[0..7] of shortint;
tmmxbyte = array[0..7] of byte;
tmmxword = array[0..3] of word;
tmmxinteger = array[0..3] of integer;
tmmxlongint = array[0..1] of longint;
tmmxcardinal = array[0..1] of cardinal;
{ for the AMD 3D }
tmmxsingle = array[0..1] of single;
pmmxshortint = ^tmmxshortint;
pmmxbyte = ^tmmxbyte;
pmmxword = ^tmmxword;
pmmxinteger = ^tmmxinteger;
{$ifdef HASFIXED}
pmmxfixed = ^tmmxfixed;
{$endif HASFIXED}
pmmxlongint = ^tmmxlongint;
pmmxcardinal = ^tmmxcardinal;
{ for the AMD 3D }
pmmxsingle = ^tmmxsingle;
const
is_mmx_cpu : boolean = false;
is_sse_cpu : boolean = false;
is_sse2_cpu : boolean = false;
is_amd_3d_cpu : boolean = false;
is_amd_3d_dsp_cpu : boolean = false;
is_amd_3d_mmx_cpu : boolean = false;
{ sets all floating point registers to empty
(use this after mmx usage)
}
procedure emms;
procedure femms;
implementation
uses
cpu;
{$ASMMODE ATT}
{ return base type of processor: 0 - is Unknown, 10 - is AMD (AuthenticAMD), }
{ 20 - is Intel (GenuineIntel) }
function getdevel:byte;
var
_ebx,_ecx,_edx : longint;
begin
getdevel:=0;
if cpuid_support then
begin
asm
pushl %ebx
movl $0,%eax
cpuid
movl %ebx,_ebx
movl %ecx,_ecx
movl %edx,_edx
popl %ebx
end;
if ((_ebx=$68747541) and (_ecx=$444D4163) and (_edx=$69746E65)) then getdevel:=10;
if ((_ebx=$756E6547) and (_ecx=$6C65746E) and (_edx=$49656E69)) then getdevel:=20;
end
end;
{ returns true, if the processor supports the mmx instructions }
function mmx_support : boolean;
var
_edx : longint;
begin
if cpuid_support then
begin
asm
pushl %ebx
movl $1,%eax
cpuid
movl %edx,_edx
popl %ebx
end;
mmx_support:=(_edx and $800000)<>0;
end
else
{ a cpu with without cpuid instruction supports never mmx }
mmx_support:=false;
end;
function amd_3d_support : boolean;
var
_edx : longint;
begin
{ are there third party cpus supporting amd 3d instructions? }
if cpuid_support and (getdevel=10) then
begin
asm
pushl %ebx
movl $0x80000001,%eax
cpuid
movl %edx,_edx
popl %ebx
end;
amd_3d_support:=(_edx and $80000000)<>0;
end
else
{ a cpu with without cpuid instruction supports never mmx }
amd_3d_support:=false;
end;
function amd_3d_dsp_support : boolean;
var
_edx : longint;
begin
{ are there third party cpus supporting amd dsp instructions? }
if cpuid_support and (getdevel=10) then
begin
asm
pushl %ebx
movl $0x80000001,%eax
cpuid
movl %edx,_edx
popl %ebx
end;
amd_3d_dsp_support:=(_edx and $40000000)<>0;
end
else
{ a cpu with without cpuid instruction supports never mmx }
amd_3d_dsp_support:=false;
end;
function amd_3d_mmx_support : boolean;
var
_edx : longint;
begin
{ are there third party cpus supporting amd mmx instructions? }
if cpuid_support and (getdevel=10) then
begin
asm
pushl %ebx
movl $0x80000001,%eax
cpuid
movl %edx,_edx
popl %ebx
end;
amd_3d_mmx_support:=(_edx and $400000)<>0;
end
else
{ a cpu with without cpuid instruction supports never mmx }
amd_3d_mmx_support:=false;
end;
function sse_support : boolean;
var
_edx : longint;
begin
if cpuid_support then
begin
asm
pushl %ebx
movl $1,%eax
cpuid
movl %edx,_edx
popl %ebx
end;
sse_support:=(_edx and $2000000)<>0;
end
else
{ a cpu with without cpuid instruction supports never sse }
sse_support:=false;
end;
function sse2_support : boolean;
var
_edx : longint;
begin
if cpuid_support then
begin
asm
pushl %ebx
movl $1,%eax
cpuid
movl %edx,_edx
popl %ebx
end;
sse2_support:=(_edx and $4000000)<>0;
end
else
{ a cpu with without cpuid instruction supports never sse2 }
sse2_support:=false;
end;
procedure emms;assembler;
asm
emms
end;
procedure femms;assembler;
asm
{ femms instruction not supported with older as versions }
.byte 0x0f, 0x0e
end;
var
oldexitproc : pointer;
procedure mmxexitproc;
begin
exitproc:=oldexitproc;
if is_amd_3d_cpu then femms else emms;
end;
begin
if mmx_support then
begin
is_mmx_cpu:=true;
if amd_3d_support then
begin
is_amd_3d_cpu:=true;
is_amd_3d_dsp_cpu:=amd_3d_dsp_support;
is_amd_3d_mmx_cpu:=amd_3d_mmx_support;
end;
is_sse_cpu:=sse_support;
is_sse2_cpu:=sse2_support;
{ the exit code sets the fpu stack to empty }
oldexitproc:=exitproc;
exitproc:=@mmxexitproc;
end;
end.
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