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lib: Add __fls() (Find Last Set)

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Implement __fls() as an alias for log2(), and remove the duplicate
definitions in commonlib/storage/sdhci.c.

Signed-off-by: Jianjun Wang <jianjun.wang@mediatek.com>
Change-Id: Ib458abfec7e03b2979569a8440a6e69b0285ac32
Reviewed-on: https://review.coreboot.org/c/coreboot/+/59738
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
This commit is contained in:
Jianjun Wang
2021-11-30 10:51:53 +08:00
committed by Hung-Te Lin
parent 5588f34a35
commit 8bb59ca2fa
4 changed files with 19 additions and 32 deletions
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10
tests/lib/lib-test.c
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@@ -37,6 +37,15 @@ void test_ffs(void **state)
assert_int_equal(__ffs(0xffffffff), 0);
}
void test_fls(void **state)
{
assert_int_equal(__fls(0x0), -1);
assert_int_equal(__fls(0x1), 0);
assert_int_equal(__fls(0x5), 2);
assert_int_equal(__fls(0x80000000), 31);
assert_int_equal(__fls(0xffffffff), 31);
}
void test_log2_ceil(void **state)
{
assert_int_equal(log2_ceil(0x0), -1);
@@ -53,6 +62,7 @@ int main(void)
cmocka_unit_test(test_clz),
cmocka_unit_test(test_log2),
cmocka_unit_test(test_ffs),
cmocka_unit_test(test_fls),
cmocka_unit_test(test_log2_ceil),
};