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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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108 lines
2.8 KiB
PHP
108 lines
2.8 KiB
PHP
(*******************************************************************
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*
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* TTCalc2.Inc 1.2
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*
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* Arithmetic and Vectorial Computations (inline assembly)
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* This version is used for the OS/2 Virtual Pascal compiler
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*
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* Copyright 1996 David Turner, Robert Wilhelm and Werner Lemberg
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*
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* This file is part of the FreeType project, and may only be used
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* modified and distributed under the terms of the FreeType project
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* license, LICENSE.TXT. By continuing to use, modify or distribute
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* this file you indicate that you have read the license and
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* understand and accept it fully.
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*
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* NOTES : All vector operations were moved to the interpreter
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*
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******************************************************************)
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(**********************************************************)
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(* *)
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(* The following routines are inline assembly, they are *)
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(* thus processor and bitness specific. Replace them *)
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(* with your own if you want to port the TrueType Engine *)
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(* We need unsigned longints to perform correctly our additions *)
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(* we include inline assembly to get them, baaahhh .. *)
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(**********************************************************)
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(* 64 Bit Addition *)
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procedure Add64( var X, Y, Z : Int64 ); assembler;
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{&USES ebx, edx}
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asm
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mov ebx,[X].dword
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mov eax,[ebx]
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mov edx,[ebx+4]
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mov ebx,[Y].dword
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add eax,[ebx]
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adc edx,[ebx+4]
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mov ebx,[Z].dword
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mov [ebx],eax
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mov [ebx+4],edx
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end;
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(**********************************************************)
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(* 64 Bit Substraction *)
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procedure Sub64( var X, Y, Z : Int64 ); assembler;
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{&USES ebx, edx}
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asm
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mov ebx,[X].dword
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mov eax,[ebx]
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mov edx,[ebx+4]
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mov ebx,[Y].dword
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sub eax,[ebx]
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sbb edx,[ebx+4]
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mov ebx,[Z].dword
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mov [ebx],eax
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mov [ebx+4],edx
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end;
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(**********************************************************)
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(* Multiply two Int32 to an Int64 *)
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procedure MulTo64( X, Y : Int32; var Z : Int64 ); assembler;
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{&USES ebx, edx }
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asm
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mov ebx,[Z].dword
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mov eax,[X]
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imul dword ptr [Y]
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mov [ebx],eax
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mov [ebx+4],edx
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end;
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(**********************************************************)
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(* Divide an Int64 by an Int32 *)
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function Div64by32( var X : Int64; Y : Int32 ) : Int32; assembler;
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{&USES ebx, edx}
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asm
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mov ebx, [X].dword
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mov eax, [ebx]
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mov edx, [ebx+4]
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idiv dword ptr [Y]
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end;
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procedure DivMod64by32( var X : Int64; Y : Int32; var Q, R : Int32 );
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assembler; {&USES ebx, edx}
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asm
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mov ebx, [X].dword
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mov eax, [ebx]
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mov edx, [ebx+4]
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idiv dword ptr [Y]
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mov ebx, [Q].dword
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mov [ebx], eax
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mov ebx, [R].dword
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mov [ebx], edx
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end;
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