Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 1 | //===- X86InstructionInfo.h - X86 Instruction Information ---------*-C++-*-===// |
John Criswell | 856ba76 | 2003-10-21 15:17:13 +0000 | [diff] [blame^] | 2 | // |
| 3 | // The LLVM Compiler Infrastructure |
| 4 | // |
| 5 | // This file was developed by the LLVM research group and is distributed under |
| 6 | // the University of Illinois Open Source License. See LICENSE.TXT for details. |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 9 | // |
Chris Lattner | 3501fea | 2003-01-14 22:00:31 +0000 | [diff] [blame] | 10 | // This file contains the X86 implementation of the TargetInstrInfo class. |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #ifndef X86INSTRUCTIONINFO_H |
| 15 | #define X86INSTRUCTIONINFO_H |
| 16 | |
Chris Lattner | 3501fea | 2003-01-14 22:00:31 +0000 | [diff] [blame] | 17 | #include "llvm/Target/TargetInstrInfo.h" |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 18 | #include "X86RegisterInfo.h" |
| 19 | |
Chris Lattner | 9d17740 | 2002-10-30 01:09:34 +0000 | [diff] [blame] | 20 | /// X86II - This namespace holds all of the target specific flags that |
| 21 | /// instruction info tracks. |
| 22 | /// |
| 23 | namespace X86II { |
| 24 | enum { |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 25 | //===------------------------------------------------------------------===// |
| 26 | // Instruction types. These are the standard/most common forms for X86 |
| 27 | // instructions. |
| 28 | // |
| 29 | |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 30 | // PseudoFrm - This represents an instruction that is a pseudo instruction |
| 31 | // or one that has not been implemented yet. It is illegal to code generate |
| 32 | // it, but tolerated for intermediate implementation stages. |
| 33 | Pseudo = 0, |
| 34 | |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 35 | /// Raw - This form is for instructions that don't have any operands, so |
| 36 | /// they are just a fixed opcode value, like 'leave'. |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 37 | RawFrm = 1, |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 38 | |
| 39 | /// AddRegFrm - This form is used for instructions like 'push r32' that have |
| 40 | /// their one register operand added to their opcode. |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 41 | AddRegFrm = 2, |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 42 | |
| 43 | /// MRMDestReg - This form is used for instructions that use the Mod/RM byte |
| 44 | /// to specify a destination, which in this case is a register. |
| 45 | /// |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 46 | MRMDestReg = 3, |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 47 | |
| 48 | /// MRMDestMem - This form is used for instructions that use the Mod/RM byte |
| 49 | /// to specify a destination, which in this case is memory. |
| 50 | /// |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 51 | MRMDestMem = 4, |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 52 | |
| 53 | /// MRMSrcReg - This form is used for instructions that use the Mod/RM byte |
| 54 | /// to specify a source, which in this case is a register. |
| 55 | /// |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 56 | MRMSrcReg = 5, |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 57 | |
| 58 | /// MRMSrcMem - This form is used for instructions that use the Mod/RM byte |
| 59 | /// to specify a source, which in this case is memory. |
| 60 | /// |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 61 | MRMSrcMem = 6, |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 62 | |
Chris Lattner | 85b39f2 | 2002-11-21 17:08:49 +0000 | [diff] [blame] | 63 | /// MRMS[0-7][rm] - These forms are used to represent instructions that use |
| 64 | /// a Mod/RM byte, and use the middle field to hold extended opcode |
| 65 | /// information. In the intel manual these are represented as /0, /1, ... |
| 66 | /// |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 67 | |
Chris Lattner | 85b39f2 | 2002-11-21 17:08:49 +0000 | [diff] [blame] | 68 | // First, instructions that operate on a register r/m operand... |
| 69 | MRMS0r = 16, MRMS1r = 17, MRMS2r = 18, MRMS3r = 19, // Format /0 /1 /2 /3 |
| 70 | MRMS4r = 20, MRMS5r = 21, MRMS6r = 22, MRMS7r = 23, // Format /4 /5 /6 /7 |
| 71 | |
| 72 | // Next, instructions that operate on a memory r/m operand... |
| 73 | MRMS0m = 24, MRMS1m = 25, MRMS2m = 26, MRMS3m = 27, // Format /0 /1 /2 /3 |
| 74 | MRMS4m = 28, MRMS5m = 29, MRMS6m = 30, MRMS7m = 31, // Format /4 /5 /6 /7 |
| 75 | |
| 76 | FormMask = 31, |
Chris Lattner | 6aab9cf | 2002-11-18 05:37:11 +0000 | [diff] [blame] | 77 | |
| 78 | //===------------------------------------------------------------------===// |
| 79 | // Actual flags... |
| 80 | |
Chris Lattner | 11e53e3 | 2002-11-21 01:32:55 +0000 | [diff] [blame] | 81 | // OpSize - Set if this instruction requires an operand size prefix (0x66), |
| 82 | // which most often indicates that the instruction operates on 16 bit data |
| 83 | // instead of 32 bit data. |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 84 | OpSize = 1 << 5, |
Brian Gaeke | 86764d7 | 2002-12-05 08:30:40 +0000 | [diff] [blame] | 85 | |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 86 | // Op0Mask - There are several prefix bytes that are used to form two byte |
| 87 | // opcodes. These are currently 0x0F, and 0xD8-0xDF. This mask is used to |
| 88 | // obtain the setting of this field. If no bits in this field is set, there |
| 89 | // is no prefix byte for obtaining a multibyte opcode. |
| 90 | // |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 91 | Op0Shift = 6, |
| 92 | Op0Mask = 0xF << Op0Shift, |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 93 | |
| 94 | // TB - TwoByte - Set if this instruction has a two byte opcode, which |
| 95 | // starts with a 0x0F byte before the real opcode. |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 96 | TB = 1 << Op0Shift, |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 97 | |
| 98 | // D8-DF - These escape opcodes are used by the floating point unit. These |
| 99 | // values must remain sequential. |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 100 | D8 = 2 << Op0Shift, D9 = 3 << Op0Shift, |
| 101 | DA = 4 << Op0Shift, DB = 5 << Op0Shift, |
| 102 | DC = 6 << Op0Shift, DD = 7 << Op0Shift, |
| 103 | DE = 8 << Op0Shift, DF = 9 << Op0Shift, |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 104 | |
Chris Lattner | 0c514f4 | 2003-01-13 00:49:24 +0000 | [diff] [blame] | 105 | //===------------------------------------------------------------------===// |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 106 | // This three-bit field describes the size of a memory operand. Zero is |
| 107 | // unused so that we can tell if we forgot to set a value. |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 108 | ArgShift = 10, |
| 109 | ArgMask = 7 << ArgShift, |
| 110 | Arg8 = 1 << ArgShift, |
| 111 | Arg16 = 2 << ArgShift, |
| 112 | Arg32 = 3 << ArgShift, |
| 113 | Arg64 = 4 << ArgShift, // 64 bit int argument for FILD64 |
| 114 | ArgF32 = 5 << ArgShift, |
| 115 | ArgF64 = 6 << ArgShift, |
| 116 | ArgF80 = 7 << ArgShift, |
Chris Lattner | 4c299f5 | 2002-12-25 05:09:59 +0000 | [diff] [blame] | 117 | |
Chris Lattner | 0c514f4 | 2003-01-13 00:49:24 +0000 | [diff] [blame] | 118 | //===------------------------------------------------------------------===// |
| 119 | // FP Instruction Classification... Zero is non-fp instruction. |
| 120 | |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 121 | // FPTypeMask - Mask for all of the FP types... |
| 122 | FPTypeShift = 13, |
| 123 | FPTypeMask = 7 << FPTypeShift, |
| 124 | |
Chris Lattner | 0c514f4 | 2003-01-13 00:49:24 +0000 | [diff] [blame] | 125 | // ZeroArgFP - 0 arg FP instruction which implicitly pushes ST(0), f.e. fld0 |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 126 | ZeroArgFP = 1 << FPTypeShift, |
Chris Lattner | 0c514f4 | 2003-01-13 00:49:24 +0000 | [diff] [blame] | 127 | |
| 128 | // OneArgFP - 1 arg FP instructions which implicitly read ST(0), such as fst |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 129 | OneArgFP = 2 << FPTypeShift, |
Chris Lattner | 0c514f4 | 2003-01-13 00:49:24 +0000 | [diff] [blame] | 130 | |
| 131 | // OneArgFPRW - 1 arg FP instruction which implicitly read ST(0) and write a |
| 132 | // result back to ST(0). For example, fcos, fsqrt, etc. |
| 133 | // |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 134 | OneArgFPRW = 3 << FPTypeShift, |
Chris Lattner | 0c514f4 | 2003-01-13 00:49:24 +0000 | [diff] [blame] | 135 | |
| 136 | // TwoArgFP - 2 arg FP instructions which implicitly read ST(0), and an |
| 137 | // explicit argument, storing the result to either ST(0) or the implicit |
| 138 | // argument. For example: fadd, fsub, fmul, etc... |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 139 | TwoArgFP = 4 << FPTypeShift, |
Chris Lattner | 0c514f4 | 2003-01-13 00:49:24 +0000 | [diff] [blame] | 140 | |
| 141 | // SpecialFP - Special instruction forms. Dispatch by opcode explicitly. |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 142 | SpecialFP = 5 << FPTypeShift, |
Chris Lattner | 0c514f4 | 2003-01-13 00:49:24 +0000 | [diff] [blame] | 143 | |
Brian Gaeke | d7908f6 | 2003-06-27 00:00:48 +0000 | [diff] [blame] | 144 | // PrintImplUses - Print out implicit uses in the assembly output. |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 145 | PrintImplUses = 1 << 16, |
Brian Gaeke | d7908f6 | 2003-06-27 00:00:48 +0000 | [diff] [blame] | 146 | |
Chris Lattner | 2959b6e | 2003-08-06 15:32:20 +0000 | [diff] [blame] | 147 | OpcodeShift = 17, |
| 148 | OpcodeMask = 0xFF << OpcodeShift, |
| 149 | // Bits 25 -> 31 are unused |
Chris Lattner | 9d17740 | 2002-10-30 01:09:34 +0000 | [diff] [blame] | 150 | }; |
| 151 | } |
| 152 | |
Chris Lattner | 3501fea | 2003-01-14 22:00:31 +0000 | [diff] [blame] | 153 | class X86InstrInfo : public TargetInstrInfo { |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 154 | const X86RegisterInfo RI; |
| 155 | public: |
Chris Lattner | 055c965 | 2002-10-29 21:05:24 +0000 | [diff] [blame] | 156 | X86InstrInfo(); |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 157 | |
Chris Lattner | 3501fea | 2003-01-14 22:00:31 +0000 | [diff] [blame] | 158 | /// getRegisterInfo - TargetInstrInfo is a superset of MRegister info. As |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 159 | /// such, whenever a client has an instance of instruction info, it should |
| 160 | /// always be able to get register info as well (through this method). |
| 161 | /// |
| 162 | virtual const MRegisterInfo &getRegisterInfo() const { return RI; } |
| 163 | |
Misha Brukman | e9d8838 | 2003-05-24 00:09:50 +0000 | [diff] [blame] | 164 | /// createNOPinstr - returns the target's implementation of NOP, which is |
| 165 | /// usually a pseudo-instruction, implemented by a degenerate version of |
| 166 | /// another instruction, e.g. X86: `xchg ax, ax'; SparcV9: `sethi r0, r0, r0' |
| 167 | /// |
| 168 | MachineInstr* createNOPinstr() const; |
| 169 | |
Misha Brukman | 12745c5 | 2003-05-24 01:08:43 +0000 | [diff] [blame] | 170 | /// isNOPinstr - not having a special NOP opcode, we need to know if a given |
| 171 | /// instruction is interpreted as an `official' NOP instr, i.e., there may be |
| 172 | /// more than one way to `do nothing' but only one canonical way to slack off. |
Misha Brukman | e9d8838 | 2003-05-24 00:09:50 +0000 | [diff] [blame] | 173 | /// |
| 174 | bool isNOPinstr(const MachineInstr &MI) const; |
| 175 | |
Chris Lattner | f21dfcd | 2002-11-18 06:56:24 +0000 | [diff] [blame] | 176 | // getBaseOpcodeFor - This function returns the "base" X86 opcode for the |
| 177 | // specified opcode number. |
| 178 | // |
Chris Lattner | 4d18d5c | 2003-08-03 21:56:22 +0000 | [diff] [blame] | 179 | unsigned char getBaseOpcodeFor(unsigned Opcode) const { |
| 180 | return get(Opcode).TSFlags >> X86II::OpcodeShift; |
| 181 | } |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 182 | }; |
| 183 | |
Chris Lattner | 7261408 | 2002-10-25 22:55:53 +0000 | [diff] [blame] | 184 | #endif |