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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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3
payloads/libpayload/include/libpayload.h
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@ -457,6 +457,8 @@ static inline int clz(u32 x)
static inline int log2(u32 x) { return (int)sizeof(x) * 8 - clz(x) - 1; }
/* Find First Set: __ffs(0xf) == 0, __ffs(0) == -1, __ffs(1 << 31) == 31 */
static inline int __ffs(u32 x) { return log2(x & (u32)(-(s32)x)); }
/* Find Last Set: __fls(1) == 0, __fls(5) == 2, __fls(1 << 31) == 31 */
static inline int __fls(u32 x) { return log2(x); }
static inline int popcnt64(u64 x) { return __builtin_popcountll(x); }
static inline int clz64(u64 x)
@ -466,6 +468,7 @@ static inline int clz64(u64 x)
static inline int log2_64(u64 x) { return sizeof(x) * 8 - clz64(x) - 1; }
static inline int __ffs64(u64 x) { return log2_64(x & (u64)(-(s64)x)); }
static inline int __fls64(u64 x) { return log2_64(x); }
/** @} */
/**