Contents

.globl is_leap_year

#
# Determine if the given year is a leap year
#
# There is a leap year every year whose number is perfectly divisible by four,
# except for years which are both divisible by 100 and not divisible by 400.
#
# Variables:
#
# $a0 - given value (year, as an int)
# $v0 - final value - is $a0 a leap year?
# $t0 - whether n is *not* divisible by 100 (boolean)
# $t1 - whether n is divisible by 400 (boolean)

is_leap_year:

andi    $v0,$a0,3               # Consider the two lowest bits of n.
sltiu   $v0,$v0,1               # If they are zero, then n is divisible by 4

rem     $t0,$a0,100             # Obtain n modulo 100
slt     $t0,$zero,$t0           # If it is not zero, then n is not divisible by 100.

rem     $t1,$a0,400             # Obtain n modulo 400
sltiu   $t1,$t1,1               # If it is zero, then n is divisible by 400.

and     $v0,$v0,$t0             # Leap year if divisible by 4 and not 100...
or      $v0,$v0,$t1             # or divisible by 400.

jr $ra

Version data entries

396 entries across 396 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.179	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.178	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.177	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.176	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.175	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.174	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.173	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.172	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.171	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.170	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.169	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.167	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.166	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.165	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.164	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.163	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.162	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.161	tracks/mips/exercises/leap/example.mips
trackler-2.2.1.160	tracks/mips/exercises/leap/example.mips