kvisc/vm/in/ARITH

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

#---------------------------------------------------------------------------#
# 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 rim rim

#
# 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
# Sets ZF and SF according to the result
#
sgn rm rim
sgnf rm rim

#
# Arithmetical NEG operation
#
#       $1 = NOT($2) + 1
#
# Sets CF if $2 == 0; clears it otherwise
# Sets OF if $2 == $LONG_MIN; clears it otherwise
# Sets ZF and SF according to the result
#
neg rm rim
negf rm rim

#
# Arithmetical INC operation
#
#       $1 = $1 + 1
#
# Preserves CF
# Sets OF if $1 == $LONG_MAX, clears it otherwise
# Sets ZF and SF according to the result
#
inc rm
incf rm

#
# Arithmetical DEC operation
#
#       $1 = $1 - 1
#
# Preserves CF
# Sets OF if $1 == $LONG_MIN, clears it otherwise
# Sets ZF and SF according to the result
#
dec rm
decf rm

#
# Arithmetical ADD operation
#
#       $1 = $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
#
add rm rim
addf rm rim

#
# Atomic exchange and add (XADD)
#
#       $tmp = $1
#       $1 = $1 + $2
#       $2 = $1
#
# Preserves all flags
#
xadd rm rm

#
# Arithmetical ADD operation, with carry
#
#       $1 = $1 + $2 + CF
#
# 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
#
adc rm rim
adcf rm rim

#
# Arithmetical SUB operation
#
#       $1 = $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
#
sub rm rim
subf rm rim

#
# Arithmetical unsigned MUL operation
#
#       $1 = LO($1 * $2)
#
# Sets CF and OF if HI($1 * $2) > 0, clears them otherwise
# Preserves ZF and SF
#
mul rm rim
mulf rm rim

#
# Arithmetical unsigned 128-bit MUL operation
#
#       $1 = HI($2 * $3)
#       $2 = LO($2 * $3)
#
# Sets CF and OF if HI($2 * $3) > 0, clears them otherwise
# Preserves ZF and SF
#
mulx rm rm rim
mulfx rm rm rim

#
# Arithmetical unsigned DIV operation
#
#       $1 = $1 DIV $2
#
# Preserves all flags
#
div rm rim

#
# Arithmetical unsigned combined DIV and MOD operations
#
#       $1 = ($2 MOD $3)
#       $2 = ($2 DIV $3)
#
# Preserves all flags
#

divx rm rm rim
#
# Arithmetical unsigned modulo operation (REM)
#
#       $1 = $1 MOD $2
#
# Preserves all flags
#
rem rm rim