diff options
| author | Tim Wawrzynczak <twawrzynczak@chromium.org> | 2020-10-01 15:36:42 -0600 |
|---|---|---|
| committer | Angel Pons <th3fanbus@gmail.com> | 2020-10-14 15:24:59 +0000 |
| commit | 7ded1afe0a518c65c5f2850984419287ac880fa1 (patch) | |
| tree | 1efc9911225aa4c697b6b2697c21f744d630c665 | |
| parent | 7223bfa47ea831fca634550ad7e7a534d0fe8ec9 (diff) | |
lib and libpayload: add 64-bit versions of clz, __ffs and log2
Add 64-bit versions of clz, __ffs & log2: `__ffs64`, `__clz64`,
and `log2_64`.
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Change-Id: Iefc6e6c51f5b20607c88e38660a499a4f77ce0d0
Reviewed-on: https://review.coreboot.org/c/coreboot/+/45938
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
| -rw-r--r-- | payloads/libpayload/include/libpayload.h | 8 | ||||
| -rw-r--r-- | src/include/lib.h | 4 |
2 files changed, 12 insertions, 0 deletions
diff --git a/payloads/libpayload/include/libpayload.h b/payloads/libpayload/include/libpayload.h index 01d71b8e61..475fe0f3fc 100644 --- a/payloads/libpayload/include/libpayload.h +++ b/payloads/libpayload/include/libpayload.h @@ -454,6 +454,14 @@ 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)); } + +static inline int clz64(u64 x) +{ + return x ? __builtin_clzll(x) : sizeof(x) * 8; +} + +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)); } /** @} */ /** diff --git a/src/include/lib.h b/src/include/lib.h index 46d8b02112..a0003d3e29 100644 --- a/src/include/lib.h +++ b/src/include/lib.h @@ -56,4 +56,8 @@ static inline int __ffs(u32 x) { return log2(x & (u32)(-(s32)x)); } /* Integer binary logarithm (rounding up): log2_ceil(0) == -1, log2(5) == 3 */ static inline int log2_ceil(u32 x) { return (x == 0) ? -1 : log2(x * 2 - 1); } +static inline int clz64(u64 x) { return x ? __builtin_clzll(x) : sizeof(x) * 8; } +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)); } + #endif /* __LIB_H__ */ |