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 NOT operation
#
#       $1 = NOT($2)
#
# Preserves all flags
#
not r r

#
# Bitwise OR operation
#
#       $dest = $src1 OR $src2
#
# Preserves all flags
#
or r r ri
# $dest = $src1 OR NOT($src2)
orn r r ri
# $dest = NOT($src1 OR $src2)
nor r r ri

#
# Bitwise AND operation
#
#       $dest = $src1 AND $src2
#
# Preserves all flags
#
and r r ri
# $dest = $src1 AND NOT($src2)
andn r r ri
# $dest = NOT($src1 AND $src2)
nand r r ri

#
# Bitwise XOR operation
# 
#       $dest = $src1 XOR $src2
#
# Preserves all flags
#
xor r r ri
# $dest = $src1 XOR NOT($src2)
xorn r r ri
# $dest = NOT($src1 XOR $src2)
xnor r r ri

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

#
# Arithmetical left/right shift (SAL/SAR)
#
#       $dest = $src1 <<< $src2     (SAL)
#       $dest = $src1 >>> $src2     (SAR)
#
# Preserves all flags
#
sal r r ri
sar r r ri

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

#
# CMP Comparison instruction
#
#       $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 r ri
cmp m ri

#
# Arithmetical SGN operation
#
#       IF ($1 == 0) THEN
#           $2 = 0
#       ELIF ($1 GT 0) THEN
#           $2 = 1
#       ELSE
#           $2 = LONG_MIN
#       FI
#
# Treats $1 and $2 as signed values
#
# Preserves all flags
#
sgn r r

#
# Arithmetical NEG operation
#
#       $1 = NOT($2) + 1
#
# Preserves all flags
#
neg r r

#
# Arithmetical INC operation
#
#       $1 = $1 + 1
#
# Preserves all flags
#
inc r

#
# Arithmetical DEC operation
#
#       $1 = $1 - 1
#
# Preserves all flags
#
dec r

#
# 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 r r ri
addf r r ri
addo r r ri

#
# 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 r r ri
subf r r ri
subo r r ri

#
# Arithmetical ADD/SUB operation, with carry/overflow
#
#       $dest = $src1 + $src2 + CF      (ADC)
#       $dest = $src1 + $src2 + OF      (ADO)
#       $dest = $src1 - $src2 - CF      (SBB)
#       $dest = $src1 - $src2 - OF      (SBO)
#
# Preserves ZF and SF
# Flags CF and OF are undefined for now
#
adcx r r ri
adox r r ri
sbbx r r ri
sbox r r ri

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

# Arithmetical unsigned MUL operation
#
#       $dest1 = HI($dest2 * $src)
#       $dest2 = LO($dest2 * $src)
#
# Sets CF and OF if HI($2 * $3) > 0, clears them otherwise
# Preserves ZF and SF
#
mulhi r r ri

#
# Arithmetical unsigned DIV operation
#
#       $dest1 = $1 DIV $2
#
# Preserves all flags
#
div r r ri

#
# Arithmetical unsigned modulo operation (REM)
#
#       $1 = $1 MOD $2
#
# Preserves all flags
#
rem r r ri