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|
#!/usr/bin/perl
use strict;
use warnings;
use Test::More 0.88;
use Math::Int128 qw(uint128 uint128_to_number
net_to_uint128 uint128_to_net
native_to_uint128 uint128_to_native);
my $i = uint128('1234567890123456789');
my $j = $i + 1;
my $k = (uint128(1) << 60) + 255;
# 1
ok($i == '1234567890123456789');
ok($j - 1 == '1234567890123456789');
ok (($k & 127) == 127);
ok (($k & 256) == 0);
# 5
ok ($i * 2 == $j + $j - 2);
ok ($i * $i * $i * $i == ($j * $j - 2 * $j + 1) * ($j * $j - 2 * $j + 1));
ok (($i / $j) == 0);
ok ($j / $i == 1);
ok ($i % $j == $i);
# 10
ok ($j % $i == 1);
ok (($j += 1) == $i + 2);
ok ($j == $i + 2);
ok (($j -= 3) == $i - 1);
ok ($j == $i - 1);
$j = $i;
# 15
ok (($j *= 2) == $i << 1);
ok (($j >> 1) == $i);
ok (($j / 2) == $i);
$j = $i + 2;
ok (($j %= $i) == 2);
ok ($j == 2);
# 20
ok (($j <=> $i) < 0);
ok (($i <=> $j) > 0);
ok (($i <=> $i) == 0);
ok (($j <=> 2) == 0);
ok ($j < $i);
# 25
ok ($j <= $i);
ok (!($i < $j));
ok (!($i <= $j));
ok ($i <= $i);
ok ($j >= $j);
# 30
ok ($i > $j);
ok ($i >= $j);
ok (!($j > $i));
ok (!($j >= $i));
ok (int(log(uint128(1)<<50)/log(2)+0.001) == 50);
# 35
my $l = uint128("127131031961723452345");
is ("$l", "127131031961723452345", "string to/from int128 conversion");
ok (native_to_uint128(uint128_to_native(1)) == 1);
ok (native_to_uint128(uint128_to_native(0)) == 0);
ok (native_to_uint128(uint128_to_native(12343)) == 12343);
ok (native_to_uint128(uint128_to_native($l)) == $l);
# 40
ok (native_to_uint128(uint128_to_native($j)) == $j);
ok (native_to_uint128(uint128_to_native($i)) == $i);
ok (net_to_uint128(uint128_to_net(1)) == 1);
ok (net_to_uint128(uint128_to_net(0)) == 0);
ok (net_to_uint128(uint128_to_net(12343)) == 12343);
# 45
ok (net_to_uint128(uint128_to_net($l)) == $l);
ok (net_to_uint128(uint128_to_net($j)) == $j);
ok (net_to_uint128(uint128_to_net($i)) == $i);
{
use integer;
my $int = uint128(255);
ok($int == 255);
$int <<= 32;
$int |= 4294967295;
ok($int == '1099511627775');
}
my $two = uint128(2);
my $four = uint128(4);
is ($two ** -1, 0, "signed pow 2**-1");
is ($four ** -1, 0, "signed pow 4**-1");
sub slow_pow_uint128 {
my ($a, $b) = @_;
my $acu = uint128(1);
$acu *= $a for 1..$b;
$acu;
}
sub slow_pow_nv {
my ($base, $exp) = @_;
my $r = 1;
$r *= $base for 1..$exp;
$r
}
my $max = (((uint128(2) ** 127) - 1) * 2) + 1;
for my $j (0..127) {
my $one = uint128(1);
is($two ** $j, $one << $j, "signed pow 2**$j");
is($four ** $j, $one << 2 * $j, "signed pow 4**$j") if $j < 64;
is($one << $j, $two ** $j, "$one << $j");
$one <<= $j;
is($one, $two ** $j, "$one <<= $j");
next unless $j;
my $pow2j = slow_pow_nv(2, $j);
is($max >> $j, $max / $pow2j, "max uint128 >> $j");
my $copy = uint128($max);
$copy >>= $j;
is($copy, $max / $pow2j, "max uint128 >>= $j");
}
for my $i (5..9) {
for my $j (0..40) { # 9**40 < 2**127
is(uint128($i) ** $j, slow_pow_uint128($i, $j), "signed pow $i ** $j");
}
}
done_testing();
|
