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Add lg_ceil to bit_util.

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Also, add the bit_util test back to the Makefile.
This commit is contained in:
David Goldblatt
2017-12-22 15:14:44 -08:00
committed by David Goldblatt
parent 07b89c7673
commit 2f07e92adb
3 changed files with 76 additions and 68 deletions
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56
test/unit/bit_util.c
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@@ -48,10 +48,64 @@ TEST_BEGIN(test_pow2_ceil_zu) {
}
TEST_END
void
assert_lg_ceil_range(size_t input, unsigned answer) {
if (input == 1) {
assert_u_eq(0, answer, "Got %u as lg_ceil of 1", answer);
return;
}
assert_zu_le(input, (ZU(1) << answer),
"Got %u as lg_ceil of %zu", answer, input);
assert_zu_gt(input, (ZU(1) << (answer - 1)),
"Got %u as lg_ceil of %zu", answer, input);
}
void
assert_lg_floor_range(size_t input, unsigned answer) {
if (input == 1) {
assert_u_eq(0, answer, "Got %u as lg_floor of 1", answer);
return;
}
assert_zu_ge(input, (ZU(1) << answer),
"Got %u as lg_floor of %zu", answer, input);
assert_zu_lt(input, (ZU(1) << (answer + 1)),
"Got %u as lg_floor of %zu", answer, input);
}
TEST_BEGIN(test_lg_ceil_floor) {
for (size_t i = 1; i < 10 * 1000 * 1000; i++) {
assert_lg_ceil_range(i, lg_ceil(i));
assert_lg_ceil_range(i, LG_CEIL(i));
assert_lg_floor_range(i, lg_floor(i));
assert_lg_floor_range(i, LG_FLOOR(i));
}
for (int i = 10; i < 8 * (1 << LG_SIZEOF_PTR) - 5; i++) {
for (size_t j = 0; j < (1 << 4); j++) {
size_t num1 = ((size_t)1 << i)
- j * ((size_t)1 << (i - 4));
size_t num2 = ((size_t)1 << i)
+ j * ((size_t)1 << (i - 4));
assert_zu_ne(num1, 0, "Invalid lg argument");
assert_zu_ne(num2, 0, "Invalid lg argument");
assert_lg_ceil_range(num1, lg_ceil(num1));
assert_lg_ceil_range(num1, LG_CEIL(num1));
assert_lg_ceil_range(num2, lg_ceil(num2));
assert_lg_ceil_range(num2, LG_CEIL(num2));
assert_lg_floor_range(num1, lg_floor(num1));
assert_lg_floor_range(num1, LG_FLOOR(num1));
assert_lg_floor_range(num2, lg_floor(num2));
assert_lg_floor_range(num2, LG_FLOOR(num2));
}
}
}
TEST_END
int
main(void) {
return test(
test_pow2_ceil_u64,
test_pow2_ceil_u32,
test_pow2_ceil_zu);
test_pow2_ceil_zu,
test_lg_ceil_floor);
}