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# SPDX-License-Identifier: BSD-2-Clause
# Copyright 1996-2025 The NASM Authors - All Rights Reserved
#
# List of registers and their classes; classes are defined in nasm.h
#
# The columns are:
#
# register name, assembler class, disassembler class(es), x86 register number[, token flag]
#
# If the register name ends in two numbers separated by a dash, then it is
# repeated as many times as indicated, and the register number is
# updated with it.
#
# If 'token flag' is present, this value will be assigned to tokflag field in
# 'struct tokendata tokendata[]' table. Token flag can be used for specifying
# special usage of corresponding register. E.g. opmask registers can be either
# enclosed by curly braces or standalone operand depending on the usage.
#
# General-purpose registers
al REG_AL reg8,reg8_rex 0
ah REG_HIGH reg8 4
ax REG_AX reg16 0
eax REG_EAX reg32 0
rax REG_RAX reg64 0
bl REG_BL reg8,reg8_rex 3
bh REG_HIGH reg8 7
bx REG_BX reg16 3
ebx REG_EBX reg32 3
rbx REG_RBX reg64 3
cl REG_CL reg8,reg8_rex 1
ch REG_HIGH reg8 5
cx REG_CX reg16 1
ecx REG_ECX reg32 1
rcx REG_RCX reg64 1
dl REG_DL reg8,reg8_rex 2
dh REG_HIGH reg8 6
dx REG_DX reg16 2
edx REG_EDX reg32 2
rdx REG_RDX reg64 2
spl REG8 reg8_rex 4
sp REG16 reg16 4
esp REG32 reg32 4
rsp REG64 reg64 4
bpl REG8 reg8_rex 5
bp REG16 reg16 5
ebp REG32 reg32 5
rbp REG64 reg64 5
sil REG8 reg8_rex 6
si REG16 reg16 6
esi REG32 reg32 6
rsi REG64 reg64 6
dil REG8 reg8_rex 7
di REG16 reg16 7
edi REG32 reg32 7
rdi REG64 reg64 7
r8-31b REG8 reg8_rex 8
r8-31w REG16 reg16 8
r8-31d REG32 reg32 8
r8-31 REG64 reg64 8
# Segment registers
es REG_ES sreg 0 & 7
cs REG_CS sreg 1
ss REG_SS sreg 2
ds REG_DS sreg 3
fs REG_FS sreg 4
gs REG_GS sreg 5
segr6-7 REG_SEG67 sreg 6
# Control registers
cr0-31 REG_CREG creg 0
# Debug registers
dr0-31 REG_DREG dreg 0
# Test registers
tr0-7 REG_TREG treg 0 & 7
# Floating-point registers
st0-7 FPUREG fpureg 0 & 7
# MMX registers
mm0-7 MMXREG mmxreg 0 & 7
# SSE/AVX registers
xmm0-31 XMMREG xmmreg 0
ymm0-31 YMMREG ymmreg 0
zmm0-31 ZMMREG zmmreg 0
# AMX tile registers
tmm0-7 TMMREG tmmreg 0 & 7
# Opmask registers
k0 OPMASKREG opmaskreg 0 & 7
k1-7 OPMASKREG opmaskreg 1 TFLAG_BRC_OPT
# Bounds registers (the mask here really is 7, not 3;
# 4-7 were reserved encodings)
bnd0-3 BNDREG bndreg 0 & 7
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