39. Z8000 Dependent Features....................................................................................................... 221

39.1. Options......................................................................................................................... 221

39.2. Syntax .......................................................................................................................... 221

39.2.1. Special Characters......................................................................................... 221

39.2.2. Register Names ............................................................................................. 221

39.2.3. Addressing Modes ........................................................................................ 221

39.3. Assembler Directives for the Z8000 ............................................................................ 222

39.4. Opcodes........................................................................................................................ 223

40. VAX Dependent Features ......................................................................................................... 225

40.1. VAX Command Line Options ..................................................................................... 225

40.2. VAX Floating Point...................................................................................................... 226

40.3. Vax Machine Directives ............................................................................................... 226

40.4. VAX Opcodes .............................................................................................................. 227

40.5. VAX Branch Improvement .......................................................................................... 227

40.6. VAX Operands ............................................................................................................. 229

40.7. Not Supported on VAX ................................................................................................ 229

41. v850 Dependent Features ......................................................................................................... 231

41.1. Options......................................................................................................................... 231

41.2. Syntax .......................................................................................................................... 231

41.2.1. Special Characters......................................................................................... 232

41.2.2. Register Names ............................................................................................. 232

41.3. Floating Point............................................................................................................... 234

41.4. V850 Machine Directives ............................................................................................ 234

41.5. Opcodes........................................................................................................................ 235

42. Xtensa Dependent Features...................................................................................................... 239

42.1. Command Line Options............................................................................................... 239

42.2. Assembler Syntax ........................................................................................................ 239

42.2.1. Opcode Names .............................................................................................. 240

42.2.2. Register Names ............................................................................................. 240

42.3. Xtensa Optimizations................................................................................................... 240

42.3.1. Using Density Instructions............................................................................ 240

42.3.2. Automatic Instruction Alignment ................................................................. 241

42.4. Xtensa Relaxation ........................................................................................................ 241

42.4.1. Conditional Branch Relaxation..................................................................... 241

42.4.2. Function Call Relaxation .............................................................................. 242

42.4.3. Other Immediate Field Relaxation................................................................ 242

42.5. Directives ..................................................................................................................... 243

42.5.1. density ........................................................................................................... 244

42.5.2. relax............................................................................................................... 244

42.5.3. longcalls ........................................................................................................ 245

42.5.4. generics ......................................................................................................... 245

42.5.5. literal ............................................................................................................. 245

42.5.6. literal_position .............................................................................................. 246

42.5.7. literal_prefix.................................................................................................. 246

42.5.8. freeregs.......................................................................................................... 246

42.5.9. frame ............................................................................................................. 247

43. Reporting Bugs.......................................................................................................................... 249

43.1. Have You Found a Bug? .............................................................................................. 249

43.2. How to Report Bugs..................................................................................................... 249

44. Acknowledgements ................................................................................................................... 253

A. GNU Free Documentation License ........................................................................................... 255

A.1. ADDENDUM: How to use this License for your documents....................................... 259