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Add @intlog2 for Floored CT log-base2 (#2355)

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* Add `@intlog2` for Floored CT log-base2
---------

Co-authored-by: Christoffer Lerno <christoffer@aegik.com>
This commit is contained in:
Zack Puhl
2025-08-02 16:53:36 -04:00
committed by GitHub
parent cb62554a26
commit e707190539
3 changed files with 36 additions and 0 deletions
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18
test/unit/stdlib/math/math.c3
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@@ -457,6 +457,24 @@ fn void test_log() @test
}
}
fn void test_ct_intlog2() @test @if($feature(SLOW_TESTS))
{
uint128 actual, expected;
$for var $x = 0; $x <= 128; ++$x :
expected = (uint128)math::floor(math::log2($x));
actual = (uint128)math::@intlog2($x);
assert(expected == actual, "input %d: floor(log2($x)) -> %d is not equal to @intlog2($x) -> %d", $x, expected, actual);
$endfor
var $logme = (uint128)1;
$for var $x = 0; $x < 8192; ++$x :
$logme *= 13;
expected = (uint128)math::floor(math::log2((uint128)$logme));
actual = (uint128)math::@intlog2((uint128)$logme);
assert(expected == actual, "input %d (idx %d): floor(log2(|$logme|)) -> %d is not equal to @intlog2(|$logme|) -> %d", $logme, $x, expected, actual);
$endfor
}
fn void test_pow() @test
{
int[<10>] e = { 2, 1, 0, -1, -2, 2, 1, 0, -1, -2 };