snes9x super fx ops

/***********************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.

  (c) Copyright 1996 - 2002  Gary Henderson ([email protected]),
                             Jerremy Koot ([email protected])

  (c) Copyright 2002 - 2004  Matthew Kendora

  (c) Copyright 2002 - 2005  Peter Bortas ([email protected])

  (c) Copyright 2004 - 2005  Joel Yliluoma (http://iki.fi/bisqwit/)

  (c) Copyright 2001 - 2006  John Weidman ([email protected])

  (c) Copyright 2002 - 2006  funkyass ([email protected]),
                             Kris Bleakley ([email protected])

  (c) Copyright 2002 - 2010  Brad Jorsch ([email protected]),
                             Nach ([email protected]),

  (c) Copyright 2002 - 2011  zones ([email protected])

  (c) Copyright 2006 - 2007  nitsuja

  (c) Copyright 2009 - 2011  BearOso,
                             OV2


  BS-X C emulator code
  (c) Copyright 2005 - 2006  Dreamer Nom,
                             zones

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003  _Demo_ ([email protected]),
                             Nach,
                             zsKnight ([email protected])

  C4 C++ code
  (c) Copyright 2003 - 2006  Brad Jorsch,
                             Nach

  DSP-1 emulator code
  (c) Copyright 1998 - 2006  _Demo_,
                             Andreas Naive ([email protected]),
                             Gary Henderson,
                             Ivar ([email protected]),
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora,
                             Nach,
                             neviksti ([email protected])

  DSP-2 emulator code
  (c) Copyright 2003         John Weidman,
                             Kris Bleakley,
                             Lord Nightmare ([email protected]),
                             Matthew Kendora,
                             neviksti

  DSP-3 emulator code
  (c) Copyright 2003 - 2006  John Weidman,
                             Kris Bleakley,
                             Lancer,
                             z80 gaiden

  DSP-4 emulator code
  (c) Copyright 2004 - 2006  Dreamer Nom,
                             John Weidman,
                             Kris Bleakley,
                             Nach,
                             z80 gaiden

  OBC1 emulator code
  (c) Copyright 2001 - 2004  zsKnight,
                             pagefault ([email protected]),
                             Kris Bleakley
                             Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code used in 1.39-1.51
  (c) Copyright 2002         Matthew Kendora with research by
                             zsKnight,
                             John Weidman,
                             Dark Force

  SPC7110 and RTC C++ emulator code used in 1.52+
  (c) Copyright 2009         byuu,
                             neviksti

  S-DD1 C emulator code
  (c) Copyright 2003         Brad Jorsch with research by
                             Andreas Naive,
                             John Weidman

  S-RTC C emulator code
  (c) Copyright 2001 - 2006  byuu,
                             John Weidman

  ST010 C++ emulator code
  (c) Copyright 2003         Feather,
                             John Weidman,
                             Kris Bleakley,
                             Matthew Kendora

  Super FX x86 assembler emulator code
  (c) Copyright 1998 - 2003  _Demo_,
                             pagefault,
                             zsKnight

  Super FX C emulator code
  (c) Copyright 1997 - 1999  Ivar,
                             Gary Henderson,
                             John Weidman

  Sound emulator code used in 1.5-1.51
  (c) Copyright 1998 - 2003  Brad Martin
  (c) Copyright 1998 - 2006  Charles Bilyue'

  Sound emulator code used in 1.52+
  (c) Copyright 2004 - 2007  Shay Green ([email protected])

  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004  Marcus Comstedt ([email protected])

  2xSaI filter
  (c) Copyright 1999 - 2001  Derek Liauw Kie Fa

  HQ2x, HQ3x, HQ4x filters
  (c) Copyright 2003         Maxim Stepin ([email protected])

  NTSC filter
  (c) Copyright 2006 - 2007  Shay Green

  GTK+ GUI code
  (c) Copyright 2004 - 2011  BearOso

  Win32 GUI code
  (c) Copyright 2003 - 2006  blip,
                             funkyass,
                             Matthew Kendora,
                             Nach,
                             nitsuja
  (c) Copyright 2009 - 2011  OV2

  Mac OS GUI code
  (c) Copyright 1998 - 2001  John Stiles
  (c) Copyright 2001 - 2011  zones


  Specific ports contains the works of other authors. See headers in
  individual files.


  Snes9x homepage: http://www.snes9x.com/

  Permission to use, copy, modify and/or distribute Snes9x in both binary
  and source form, for non-commercial purposes, is hereby granted without
  fee, providing that this license information and copyright notice appear
  with all copies and any derived work.

  This software is provided 'as-is', without any express or implied
  warranty. In no event shall the authors be held liable for any damages
  arising from the use of this software or it's derivatives.

  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes,
  but is not limited to, charging money for Snes9x or software derived from
  Snes9x, including Snes9x or derivatives in commercial game bundles, and/or
  using Snes9x as a promotion for your commercial product.

  The copyright holders request that bug fixes and improvements to the code
  should be forwarded to them so everyone can benefit from the modifications
  in future versions.

  Super NES and Super Nintendo Entertainment System are trademarks of
  Nintendo Co., Limited and its subsidiary companies.
 ***********************************************************************************/
/*
 Codes used:
   rn   = a GSU register (r0 - r15)
   #n   = 4 bit immediate value
   #pp  = 8 bit immediate value
   (yy) = 8 bit word address (0x0000 - 0x01fe)
   #xx  = 16 bit immediate value
   (xx) = 16 bit address (0x0000 - 0xffff)
*/
// OP HEX - instruction - description
// 00 - stop - stop GSU execution (and maybe generate an IRQ)
// 01 - nop - no operation
// 02 - cache - reintialize GSU cache
// 03 - lsr - logic shift right
// 04 - rol - rotate left
// 05 - bra - branch always
// 06 - blt - branch on less than
// 07 - bge - branch on greater or equals
// 08 - bne - branch on not equal
// 09 - beq - branch on equal
// 0a - bpl - branch on plus
// 0b - bmi - branch on minus
// 0c - bcc - branch on carry clear
// 0d - bcs - branch on carry set
// 0e - bvc - branch on overflow clear
// 0f - bvs - branch on overflow set
// 10-1f - to rn - set register n as destination register
// 10-1f (B) - move rn - move one register to another (if B flag is set)
// 20-2f - to rn - set register n as source and destination register
// 30-3b - stw (rn) - store word
// 30-3b (ALT1) - stb (rn) - store byte
// 3c - loop - decrement loop counter, and branch on not zero
// 3d - alt1 - set alt1 mode
// 3e - alt2 - set alt2 mode
// 3f - alt3 - set alt3 mode
// 40-4b - ldw (rn) - load word from RAM
// 40-4b (ALT1) - ldb (rn) - load byte
// 4c - plot - plot pixel with R1, R2 as x, y and the color register as the color
// 4c (ALT1) - rpix - read color of the pixel with R1, R2 as x, y
// 4c - plot - plot pixel with R1, R2 as x, y and the color register as the color
// 4c (ALT1) - rpix - read color of the pixel with R1, R2 as x, y
// 4c - plot - plot pixel with R1, R2 as x, y and the color register as the color
// 4c (ALT1) - rpix - read color of the pixel with R1, R2 as x, y
// 4c - plot - plot pixel with R1, R2 as x, y and the color register as the color
// 4c (ALT1) - rpix - read color of the pixel with R1, R2 as x, y
// 4d - swap - swap upper and lower byte of a register
// 4e - color - copy source register to color register
// 4e (ALT1) - cmode - set plot option register
// 4f - not - perform exclusive exor with 1 on all bits
// 50-5f - add rn - add, register + register
// 50-5f (ALT1) - adc rn - add with carry, register + register
// 50-5f (ALT2) - add #n - add, register + immediate
// 50-5f (ALT3) - adc #n - add with carry, register + immediate
// 60-6f - sub rn - subtract, register - register
// 60-6f (ALT1) - sbc rn - subtract with carry, register - register
// 60-6f (ALT2) - sub #n - subtract, register - immediate
// 60-6f (ALT3) - cmp rn - compare, register, register
// 70 - merge - R7 as upper byte, R8 as lower byte (used for texture-mapping)
// 71-7f - and rn - reister & register
// 71-7f (ALT1) - bic rn - reister & ~register
// 71-7f (ALT2) - and #n - reister & immediate
// 71-7f (ALT3) - bic #n - reister & ~immediate
// 80-8f - mult rn - 8 bit to 16 bit signed multiply, register * register
// 80-8f (ALT1) - umult rn - 8 bit to 16 bit unsigned multiply, register * register
// 80-8f (ALT2) - mult #n - 8 bit to 16 bit signed multiply, register * immediate
// 80-8f (ALT3) - umult #n - 8 bit to 16 bit unsigned multiply, register * immediate
// 90 - sbk - store word to last accessed RAM address
// 91-94 - link #n - R11 = R15 + immediate
// 95 - sex - sign extend 8 bit to 16 bit
// 96 - asr - aritmetric shift right by one
// 96 (ALT1) - div2 - aritmetric shift right by one
// 97 - ror - rotate right by one
// 98-9d - jmp rn - jump to address of register
// 98-9d (ALT1) - ljmp rn - set program bank to source register and jump to address of register
// 9e - lob - set upper byte to zero (keep low byte)
// 9f - fmult - 16 bit to 32 bit signed multiplication, upper 16 bits only
// 9f (ALT1) - lmult - 16 bit to 32 bit signed multiplication
// a0-af - ibt rn, #pp - immediate byte transfer
// a0-af (ALT1) - lms rn, (yy) - load word from RAM (short address)
// a0-af (ALT2) - sms (yy), rn - store word in RAM (short address)
// b0-bf - from rn - set source register
// b0-bf (B) - moves rn - move register to register, and set flags, (if B flag is set)
// c0 - hib - move high-byte to low-byte
// c1-cf - or rn
// c1-cf (ALT1) - xor rn
// c1-cf (ALT2) - or #n
// c1-cf (ALT3) - xor #n
// d0-de - inc rn - increase by one
// df - getc - transfer ROM buffer to color register
// df (ALT2) - ramb - set current RAM bank
// df (ALT3) - romb - set current ROM bank
// e0-ee - dec rn - decrement by one
// ef - getb - get byte from ROM at address R14
// ef (ALT1) - getbh - get high-byte from ROM at address R14
// ef (ALT2) - getbl - get low-byte from ROM at address R14
// ef (ALT3) - getbs - get sign extended byte from ROM at address R14
// f0-ff - iwt rn, #xx - immediate word transfer to register
// f0-ff (ALT1) - lm rn, (xx) - load word from RAM
// f0-ff (ALT2) - sm (xx), rn - store word in RAM