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AK: Add Bitmap::find_one_anywhere and optimize Bitmap::find_first

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Leverage constexpr and __builtin_ffs for Bitmap::find_first. Also add
a variant Bitmap::find_one_anywhere that can start scanning at a
provided hint.

Also, merge Bitmap::fill_range into the already existing Bitmap::set_range
This commit is contained in:
Tom 2020-09-07 15:42:50 -06:00 • committed by Andreas Kling
parent 42153221a5
commit 92e400c7f9
2 changed files with 203 additions and 60 deletions
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134
AK/Tests/TestBitmap.cpp
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@ -48,6 +48,78 @@ TEST_CASE(find_first_unset)
EXPECT_EQ(bitmap.find_first_unset().value(), 51u);
}
TEST_CASE(find_one_anywhere_set)
{
{
Bitmap bitmap(168, false);
bitmap.set(34, true);
bitmap.set(97, true);
EXPECT_EQ(bitmap.find_one_anywhere_set(0).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(31).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(32).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(34).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(36).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(63).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(64).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(96).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(96).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(97).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(127).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_set(128).value(), 34u);
}
{
Bitmap bitmap(128 + 24, false);
bitmap.set(34, true);
bitmap.set(126, true);
EXPECT_EQ(bitmap.find_one_anywhere_set(0).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(63).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_set(64).value(), 126u);
}
{
Bitmap bitmap(32, false);
bitmap.set(12, true);
bitmap.set(24, true);
auto got = bitmap.find_one_anywhere_set(0).value();
EXPECT(got == 12 || got == 24);
}
}
TEST_CASE(find_one_anywhere_unset)
{
{
Bitmap bitmap(168, true);
bitmap.set(34, false);
bitmap.set(97, false);
EXPECT_EQ(bitmap.find_one_anywhere_unset(0).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(31).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(32).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(34).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(36).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(63).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(64).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(96).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(96).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(97).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(127).value(), 97u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(128).value(), 34u);
}
{
Bitmap bitmap(128 + 24, true);
bitmap.set(34, false);
bitmap.set(126, false);
EXPECT_EQ(bitmap.find_one_anywhere_unset(0).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(63).value(), 34u);
EXPECT_EQ(bitmap.find_one_anywhere_unset(64).value(), 126u);
}
{
Bitmap bitmap(32, true);
bitmap.set(12, false);
bitmap.set(24, false);
auto got = bitmap.find_one_anywhere_unset(0).value();
EXPECT(got == 12 || got == 24);
}
}
TEST_CASE(find_first_range)
{
Bitmap bitmap(128, true);
@ -65,20 +137,36 @@ TEST_CASE(find_first_range)
TEST_CASE(set_range)
{
Bitmap bitmap(128, false);
bitmap.set_range(41, 10, true);
EXPECT_EQ(bitmap.get(40), false);
EXPECT_EQ(bitmap.get(41), true);
EXPECT_EQ(bitmap.get(42), true);
EXPECT_EQ(bitmap.get(43), true);
EXPECT_EQ(bitmap.get(44), true);
EXPECT_EQ(bitmap.get(45), true);
EXPECT_EQ(bitmap.get(46), true);
EXPECT_EQ(bitmap.get(47), true);
EXPECT_EQ(bitmap.get(48), true);
EXPECT_EQ(bitmap.get(49), true);
EXPECT_EQ(bitmap.get(50), true);
EXPECT_EQ(bitmap.get(51), false);
{
Bitmap bitmap(128, false);
bitmap.set_range(41, 10, true);
EXPECT_EQ(bitmap.get(40), false);
EXPECT_EQ(bitmap.get(41), true);
EXPECT_EQ(bitmap.get(42), true);
EXPECT_EQ(bitmap.get(43), true);
EXPECT_EQ(bitmap.get(44), true);
EXPECT_EQ(bitmap.get(45), true);
EXPECT_EQ(bitmap.get(46), true);
EXPECT_EQ(bitmap.get(47), true);
EXPECT_EQ(bitmap.get(48), true);
EXPECT_EQ(bitmap.get(49), true);
EXPECT_EQ(bitmap.get(50), true);
EXPECT_EQ(bitmap.get(51), false);
}
{
Bitmap bitmap(288, false);
bitmap.set_range(48, 32, true);
bitmap.set_range(94, 39, true);
bitmap.set_range(190, 71, true);
bitmap.set_range(190 + 71 - 7, 21, false); // slighly overlapping clear
for (size_t i = 0; i < bitmap.size(); i++) {
bool should_be_set = (i >= 48 && i < 48 + 32)
|| (i >= 94 && i < 94 + 39)
|| ((i >= 190 && i < 190 + 71) && !(i >= 190 + 71 - 7 && i < 190 + 71 - 7 + 21));
EXPECT_EQ(bitmap.get(i), should_be_set);
}
EXPECT_EQ(bitmap.count_slow(true), 32u + 39u + 71u - 7u);
}
}
TEST_CASE(find_first_fit)
@ -181,22 +269,4 @@ TEST_CASE(count_in_range)
test_with_value(false);
}
TEST_CASE(fill_range)
{
Bitmap bitmap(288, false);
bitmap.fill_range(48, 32, true);
bitmap.fill_range(94, 39, true);
bitmap.fill_range(190, 71, true);
bitmap.fill_range(190 + 71 - 7, 21, false); // slighly overlapping clear
for (size_t i = 0; i < bitmap.size(); i++) {
bool should_be_set = (i >= 48 && i < 48 + 32)
|| (i >= 94 && i < 94 + 39)
|| ((i >= 190 && i < 190 + 71) && !(i >= 190 + 71 - 7 && i < 190 + 71 - 7 + 21));
EXPECT_EQ(bitmap.get(i), should_be_set);
}
EXPECT_EQ(bitmap.count_slow(true), 32u + 39u + 71u - 7u);
}
TEST_MAIN(Bitmap)