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bugfix compress128/expand128, add unit tests

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This commit is contained in:
Konstantinos Margaritis
2021-02-08 19:20:37 +02:00
parent d9874898c7
commit f541f75400
2 changed files with 84 additions and 29 deletions
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62
unit/internal/bitutils.cpp
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@@ -294,6 +294,39 @@ TEST(BitUtils, compress64) {
}
}
TEST(BitUtils, compress128) {
const m128 all_zeroes = zeroes128();
const m128 all_ones = ones128();
const m128 odd_bits = set1_2x64(0x5555555555555555ull);
const m128 even_bits = set1_2x64(0xaaaaaaaaaaaaaaaaull);
EXPECT_EQ(0, diff128(all_zeroes, compress128(all_zeroes, all_zeroes)));
EXPECT_EQ(0, diff128(all_zeroes, compress128(all_zeroes, set1_4x32(1))));
EXPECT_EQ(0, diff128(all_zeroes, compress128(all_zeroes, all_ones)));
EXPECT_EQ(0, diff128(all_ones, compress128(all_ones, all_ones)));
EXPECT_EQ(0, diff128(set1_2x64(0xffffffffull), compress128(odd_bits, odd_bits)));
EXPECT_EQ(0, diff128(set1_2x64(0xffffffffull), compress128(even_bits, even_bits)));
EXPECT_EQ(0, diff128(all_zeroes, compress128(odd_bits, even_bits)));
EXPECT_EQ(0, diff128(all_zeroes, compress128(even_bits, odd_bits)));
// Some single-bit tests.
for (u32 i = 0; i < 64; i++) {
const m128 one_bit = set1_2x64(1ull << i);
EXPECT_EQ(0, diff128(all_zeroes, compress128(all_zeroes, one_bit)));
EXPECT_EQ(0, diff128(set1_2x64(1ull), compress128(one_bit, one_bit)));
EXPECT_EQ(0, diff128(one_bit, compress128(one_bit, all_ones)));
if (i % 2) {
EXPECT_EQ(0, diff128(set1_2x64(1ull << (i / 2)), compress128(one_bit, even_bits)));
EXPECT_EQ(0, diff128(all_zeroes, compress128(one_bit, odd_bits)));
} else {
EXPECT_EQ(0, diff128(set1_2x64(1ull << (i / 2)), compress128(one_bit, odd_bits)));
EXPECT_EQ(0, diff128(all_zeroes, compress128(one_bit, even_bits)));
}
}
}
TEST(BitUtils, expand32) {
const u32 all_ones = 0xffffffffu;
const u32 odd_bits = 0x55555555u;
@@ -352,6 +385,35 @@ TEST(BitUtils, expand64) {
}
}
TEST(BitUtils, expand128) {
const m128 all_zeroes = zeroes128();
const m128 all_ones = ones128();
const m128 odd_bits = set1_2x64(0x5555555555555555ull);
const m128 even_bits = set1_2x64(0xaaaaaaaaaaaaaaaaull);
EXPECT_EQ(0, diff128(all_zeroes, expand128(all_zeroes, all_zeroes)));
EXPECT_EQ(0, diff128(all_zeroes, expand128(all_zeroes, set1_2x64(1ull))));
EXPECT_EQ(0, diff128(all_zeroes, expand128(all_zeroes, all_ones)));
EXPECT_EQ(0, diff128(all_ones, expand128(all_ones, all_ones)));
EXPECT_EQ(0, diff128(odd_bits, expand128(set1_2x64(0xffffffffull), odd_bits)));
EXPECT_EQ(0, diff128(even_bits, expand128(set1_2x64(0xffffffffull), even_bits)));
EXPECT_EQ(0, diff128(all_zeroes, expand128(set1_2x64(0xffffffff00000000ull), even_bits)));
EXPECT_EQ(0, diff128(all_zeroes, expand128(set1_2x64(0xffffffff00000000ull), odd_bits)));
EXPECT_EQ(0, diff128(set1_2x64(1u), expand128(set1_2x64(1u), odd_bits)));
EXPECT_EQ(0, diff128(set1_2x64(2u), expand128(set1_2x64(1u), even_bits)));
// Some single-bit tests.
for (u32 i = 0; i < 64; i++) {
const m128 one_bit = set1_2x64(1ull << i);
EXPECT_EQ(0, diff128(all_zeroes, expand128(all_zeroes, one_bit)));
EXPECT_EQ(0, diff128(one_bit, expand128(set1_2x64(1ull), one_bit)));
EXPECT_EQ(0, diff128(one_bit, expand128(one_bit, all_ones)));
EXPECT_EQ(0, diff128(one_bit, expand128(set1_2x64(1ull << (i / 2)), i % 2 ? even_bits : odd_bits)));
}
}
TEST(BitUtils, bf_op_1) {
u64a a = 0;
for (u32 i = 0; i < 64; i++) {