kvisc/vm/in/ALU

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

#---------------------------------------------------------------------------#
# Logical instructions                                                      #
#---------------------------------------------------------------------------#

#
# Bitwise OR operation
#
#       $dest = $src1 OR $src2
#
# Preserves all flags
#
or 2
or 3

#
# Bitwise AND operation
#
#       $dest = $src1 AND $src2
#
# Preserves all flags
#
and 2
and 3

#
# Bitwise XOR operation
# 
#       $dest = $src1 XOR $src2
#
# Preserves all flags
#
xor 2
xor 3

#
# Logical left/right shift (SHL/SHR)
#
#       $dest = $src1 << $src2      (SHL)
#       $dest = $src1 >> $src2      (SHR)
#
# Preserves all flags
#
shl 2
shl 3
shr 2
shr 3

#
# Arithmetical right shift (SAR)
#
#       $dest = $src1 >>> $src2     (SAR)
#
# Preserves all flags
#
sar 2
sar 3

#---------------------------------------------------------------------------#
# Arithmetic instructions                                                   #
#---------------------------------------------------------------------------#

#
# CMP Comparison instruction
#
#       SignExtend($1) - $2
#
# Sets CF if unsigned integer overflow occur, clears it otherwise
# Sets OF is signed integer overflow occur, clears it otherwise
# Sets ZF and SF according to the result
#
cmp 2

#
# Arithmetical ADD operation
#
#       $dest1 = $src1 + $src2
#
# Sets CF if unsigned integer overflow occur, clears it otherwise
# Sets OF is signed integer overflow occur, clears it otherwise
# Sets ZF and SF according to the result
#
add 2
add 3
addf 3

#
# Arithmetical SUB operation
#
#       $dest = $src1 - $src2
#
# Sets CF if unsigned integer overflow occur, clears it otherwise
# Sets OF is signed integer overflow occur, clears it otherwise
# Sets ZF and SF according to the result
#
sub 2
sub 3
subf 3

#
# Arithmetical ADD/SUB operation, with carry/overflow
#
#       $dest = $src1 + $src2 + CF      (ADC)
#       $dest = $src1 - $src2 - CF      (SBB)
#
# Sets CF if unsigned integer overflow occur, clears it otherwise
# Sets OF is signed integer overflow occur, clears it otherwise
# Sets ZF and SF according to the result
#
adcx 2
adcx 3
sbbx 2
sbbx 3

#
# Arithmetical MUL operation
#
#       $dest = LO($src1 * $src2)
#
# Preserves ZF and SF
# Sets CF and OF if HI($src1 * $src2) > 0, clears them otherwise
#
mul 2
mul 3
mulf 3

# Arithmetical unsigned MUL operation
#
#       $dest1 = HI($dest2 * $src)
#       $dest2 = LO($dest2 * $src)
#
# Preserves all flags
#
mulhi 3

# Arithmetical signed MUL operation
#
#       $dest1 = HI($dest2 ** $src)
#       $dest2 = LO($dest2 ** $src)
#
# Preserves all flags
#
imulhi 3

#
# Arithmetical unsigned DIV operation
#
#       $dest = $src1 DIV $src2
#
# Preserves all flags
#
div 2
div 3

#
# Arithmetical signed DIV operation
#
#       $dest = $src1 IDIV $src2
#
# Preserves all flags
#
idiv 2
idiv 3

#
# Arithmetical modulo operation (REM)
#
#       $dest = $src1 MOD $src2
#
# Preserves all flags
#
rem 2
rem 3