1 //===-- X86RegisterInfo.def - X86 Register Information ----------*- C++ -*-===//
3 // This file describes all of the registers that the X86 backend uses. It relies
4 // on an external 'R' macro being defined that takes the arguments specified
5 // below, and is used to make all of the information relevant to registers be in
8 //===----------------------------------------------------------------------===//
10 // NOTE: No include guards desired
13 #errror "Must define R macro before including X86/X86RegisterInfo.def!"
16 // Arguments passed into the R macro
17 // #1: Enum Name - This ends up being a symbol in the X86 namespace
18 // #2: Register name - The name of the register as used by the gnu assembler
19 // #3: Register Flags - A bitfield of flags or'd together from the
20 // MRegisterInfo.h file.
21 // #4: Target Specific Flags - Another bitfield containing X86 specific flags
25 // The first register must always be a 'noop' register for all backends. This
26 // is used as the destination register for instructions that do not produce a
27 // value. Some frontends may use this as an operand register to mean special
28 // things, for example, the Sparc backend uses R#0 to mean %g0 which always
29 // PRODUCES the value 0. The X86 backend does not use this value as an operand
32 R(NoReg, "none", 0, 0)
35 // 32 bit registers, ordered as the processor does...
36 R(EAX, "eax", MRF::INT32, 0)
37 R(ECX, "ecx", MRF::INT32, 0)
38 R(EDX, "edx", MRF::INT32, 0)
39 R(EBX, "ebx", MRF::INT32, 0)
40 R(ESP, "esp", MRF::INT32, 0)
41 R(EBP, "ebp", MRF::INT32, 0)
42 R(ESI, "esi", MRF::INT32, 0)
43 R(EDI, "edi", MRF::INT32, 0)
45 // 16 bit registers, aliased with the corresponding 32 bit registers above
46 R(AX, "ax", MRF::INT16, 0)
47 R(CX, "cx", MRF::INT16, 0)
48 R(DX, "dx", MRF::INT16, 0)
49 R(BX, "bx", MRF::INT16, 0)
50 R(SP, "sp", MRF::INT16, 0)
51 R(BP, "bp", MRF::INT16, 0)
52 R(SI, "si", MRF::INT16, 0)
53 R(DI, "di", MRF::INT16, 0)
55 // 8 bit registers aliased with registers above as well
56 R(AL, "al", MRF::INT8, 0)
57 R(CL, "cl", MRF::INT8, 0)
58 R(DL, "dl", MRF::INT8, 0)
59 R(BL, "bl", MRF::INT8, 0)
60 R(AH, "ah", MRF::INT8, 0)
61 R(CH, "ch", MRF::INT8, 0)
62 R(DH, "dh", MRF::INT8, 0)
63 R(BH, "bh", MRF::INT8, 0)
65 // Flags, Segment registers, etc...
67 // We are now done with the R macro