unit FastcodeStrICompUnit;

(* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Fastcode
 *
 * The Initial Developer of the Original Code is Fastcode
 *
 * Portions created by the Initial Developer are Copyright (C) 2002-2005
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 * Charalabos Michael <chmichael@creationpower.com>
 * John O'Harrow <john@elmcrest.demon.co.uk>
 *
 * BV Version: 1.31
 * ***** END LICENSE BLOCK ***** *)

interface

{$I Fastcode.inc}
{$I CnPack.inc}

type
  FastcodeStrICompFunction = function(const Str1, Str2: PChar): Integer;

{Functions shared between Targets}
function StrIComp_JOH_IA32_3(const Str1, Str2: PChar): Integer;
function StrIComp_JOH_IA32_4(const Str1, Str2: PChar): Integer;
function StrIComp_JOH_PAS_1(const Str1, Str2: PChar): Integer;

{Functions not shared between Targets}

{Functions}

const
  FastcodeStrICompP4R: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompP4N: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompPMY: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompPMD: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompAMD64: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompAMD64_SSE3: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompIA32SizePenalty: FastcodeStrICompFunction = StrIComp_JOH_IA32_3;
  FastcodeStrICompIA32: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompMMX: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompSSESizePenalty: FastcodeStrICompFunction = StrIComp_JOH_IA32_3;
  FastcodeStrICompSSE: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompSSE2: FastcodeStrICompFunction = StrIComp_JOH_IA32_4;
  FastcodeStrICompPascalSizePenalty: FastcodeStrICompFunction = StrIComp_JOH_PAS_1;
  FastcodeStrICompPascal: FastcodeStrICompFunction = StrIComp_JOH_PAS_1;

function StrICompStub(const Str1, Str2: PChar): Integer;

implementation

uses
  SysUtils;

const
  Upper: array[Char] of Char =
    (#$00,#$01,#$02,#$03,#$04,#$05,#$06,#$07,#$08,#$09,#$0A,#$0B,#$0C,#$0D,#$0E,#$0F,
     #$10,#$11,#$12,#$13,#$14,#$15,#$16,#$17,#$18,#$19,#$1A,#$1B,#$1C,#$1D,#$1E,#$1F,
     #$20,#$21,#$22,#$23,#$24,#$25,#$26,#$27,#$28,#$29,#$2A,#$2B,#$2C,#$2D,#$2E,#$2F,
     #$30,#$31,#$32,#$33,#$34,#$35,#$36,#$37,#$38,#$39,#$3A,#$3B,#$3C,#$3D,#$3E,#$3F,
     #$40,#$41,#$42,#$43,#$44,#$45,#$46,#$47,#$48,#$49,#$4A,#$4B,#$4C,#$4D,#$4E,#$4F,
     #$50,#$51,#$52,#$53,#$54,#$55,#$56,#$57,#$58,#$59,#$5A,#$5B,#$5C,#$5D,#$5E,#$5F,
     #$60,#$41,#$42,#$43,#$44,#$45,#$46,#$47,#$48,#$49,#$4A,#$4B,#$4C,#$4D,#$4E,#$4F,
     #$50,#$51,#$52,#$53,#$54,#$55,#$56,#$57,#$58,#$59,#$5A,#$7B,#$7C,#$7D,#$7E,#$7F,
     #$80,#$81,#$82,#$83,#$84,#$85,#$86,#$87,#$88,#$89,#$8A,#$8B,#$8C,#$8D,#$8E,#$8F,
     #$90,#$91,#$92,#$93,#$94,#$95,#$96,#$97,#$98,#$99,#$9A,#$9B,#$9C,#$9D,#$9E,#$9F,
     #$A0,#$A1,#$A2,#$A3,#$A4,#$A5,#$A6,#$A7,#$A8,#$A9,#$AA,#$AB,#$AC,#$AD,#$AE,#$AF,
     #$B0,#$B1,#$B2,#$B3,#$B4,#$B5,#$B6,#$B7,#$B8,#$B9,#$BA,#$BB,#$BC,#$BD,#$BE,#$BF,
     #$C0,#$C1,#$C2,#$C3,#$C4,#$C5,#$C6,#$C7,#$C8,#$C9,#$CA,#$CB,#$CC,#$CD,#$CE,#$CF,
     #$D0,#$D1,#$D2,#$D3,#$D4,#$D5,#$D6,#$D7,#$D8,#$D9,#$DA,#$DB,#$DC,#$DD,#$DE,#$DF,
     #$E0,#$E1,#$E2,#$E3,#$E4,#$E5,#$E6,#$E7,#$E8,#$E9,#$EA,#$EB,#$EC,#$ED,#$EE,#$EF,
     #$F0,#$F1,#$F2,#$F3,#$F4,#$F5,#$F6,#$F7,#$F8,#$F9,#$FA,#$FB,#$FC,#$FD,#$FE,#$FF);

function StrIComp_JOH_IA32_4(const Str1, Str2: PChar): Integer;
asm
  push  ebx
  sub   eax, edx         {Difference between Str1 and Str2}
  mov   ebx, eax         {Exit if Str1 = Str2}
@@Check:
  test  eax, eax
  jz    @@Exit           {End Reached - Return 0}
@@Loop:
  movzx eax, [ebx+edx]   {Next Char of Str1}
  movzx ecx, [edx]
  add   edx, 1           {Prepare for Next Loop}
  cmp   eax, ecx         {Compare with Next Char of Str2}
  je    @@Check          {Same - Skip Uppercase conversion}
  movzx eax, [eax+upper] {Uppercase Char1}
  movzx ecx, [ecx+upper] {Uppercase Char2}
  sub   eax, ecx         {Compare Uppercase Characters}
  je    @@Loop
@@Exit:
  pop   ebx
end;

function StrIComp_JOH_IA32_3(const Str1, Str2: PChar): Integer;
asm
  push  ebx
  sub   eax, edx   
  mov   ecx, eax       {Difference between Str1 and Str2}
@@Check:                         
  test  eax, eax
  jz    @@Exit         {End Reached - Return 0}
@@Loop:
  movzx eax, [ecx+edx] {Next Char of Str1}
  movzx ebx, [edx]     {Next Char of Str2}
  inc   edx            {Prepare for Next Loop}
  cmp   eax, ebx       {Compare Chars}
  je    @@Check        {Same - Skip Uppercase Check}
  add   eax, $9f       {Convert 1st Char}
  add   ebx, $9f       {Convert 2nd Char}
  cmp   al, $1a
  jnb   @@1
  sub   eax, $20
@@1:
  cmp   bl, $1a
  jnb   @@2
  sub   ebx, $20
@@2:
  sub   eax, ebx       {Compare Converted Characters}
  je    @@Loop         {Loop until Different}
@@Exit:
  pop   ebx
end;

function StrIComp_JOH_PAS_1(const Str1, Str2: PChar): Integer;
var
  Ch1, Ch2 : Char;
  Offset   : Integer;
  PStr     : PChar;
begin;
  PStr   := Str1;
  Offset := Str2 - PStr;
  repeat
    Ch1 := Upper[PStr^];
    Ch2 := Upper[PStr[Offset]];
    if (Ch1 = #0) or (Ch1 <> Ch2) then
      Break;
    Inc(PStr);
  until False;
  Result := Integer(Ch1) - Integer(Ch2);
end;

function StrICompStub(const Str1, Str2: PChar): Integer;
asm
  call SysUtils.StrIComp;
end;

end.
