# The OS/K Team licenses this file to you under the MIT license.
# See the LICENSE file in the project root for more information.

#---------------------------------------------------------------------------#
# Movement instructions                                                     #
#---------------------------------------------------------------------------#

#
# Load Effective Address (LEA) instruction
#
#       $1 = ADDR($2)
#
# For instance:
#       LEA RAX, [RBX + RCX + 4]
# will result in:
#       RAX = RBX + RCX + 4
#
# Preserves all flags
#
lea r m

#
# Movement with sign-extension (MOV) instruction
#
#       $1 = $2
#
mov r rim
mov m ri

#
# Movement with sign-extension (MOVSXx) instruction
#
#       $1 = SignExtend($2 & (2^(8 * sizeof(x)) - 1)
#
movsxb r r
movsxw r r
movsxl r r

#
# Movement with zero-extension (MOVZX) instruction
#
#       $1 = ZeroExtend($2)
#
movzx r m

#
# Exchange (XCHG) instruction
#
#       $_ = $1
#       $1 = $2
#       $2 = $_
#
xchg r rm

#
# Compare-and-exchange (CMPXCHG) instruction
#
#       IF ($1 == RAX) THEN
#           $1 = $2
#           ZF = 1
#       ELSE
#           RAX = $1
#           ZF = 0
#       FI
#
# Preserves CF, OF and SF
#
cmpxchg rm r

#
# 3-operand rotation (ROTd)
#
#       $3 -> $2 -> $1 -> $3        (KROTL)
#       $1 -> $2 -> $3 -> $1        (KROTR)
#
rotr rm r r
rotl rm r r

#
# Load argument #N (LDARG)
#
#       $1 = AX$2
#
# Throws:
#       #ILL if $2 ≥ 16
#
ldarg r r