diff options
Diffstat (limited to 'absl/base/internal/bits.h')
| -rw-r--r-- | absl/base/internal/bits.h | 41 |
1 files changed, 32 insertions, 9 deletions
diff --git a/absl/base/internal/bits.h b/absl/base/internal/bits.h index ef978e9b..8b03453c 100644 --- a/absl/base/internal/bits.h +++ b/absl/base/internal/bits.h @@ -20,6 +20,8 @@ #include <cstdint> +#include "absl/base/config.h" + // Clang on Windows has __builtin_clzll; otherwise we need to use the // windows intrinsic functions. #if defined(_MSC_VER) @@ -46,15 +48,27 @@ namespace absl { -inline namespace lts_2019_08_08 { +ABSL_NAMESPACE_BEGIN namespace base_internal { ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64Slow(uint64_t n) { int zeroes = 60; - if (n >> 32) zeroes -= 32, n >>= 32; - if (n >> 16) zeroes -= 16, n >>= 16; - if (n >> 8) zeroes -= 8, n >>= 8; - if (n >> 4) zeroes -= 4, n >>= 4; + if (n >> 32) { + zeroes -= 32; + n >>= 32; + } + if (n >> 16) { + zeroes -= 16; + n >>= 16; + } + if (n >> 8) { + zeroes -= 8; + n >>= 8; + } + if (n >> 4) { + zeroes -= 4; + n >>= 4; + } return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes; } @@ -96,9 +110,18 @@ ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64(uint64_t n) { ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32Slow(uint64_t n) { int zeroes = 28; - if (n >> 16) zeroes -= 16, n >>= 16; - if (n >> 8) zeroes -= 8, n >>= 8; - if (n >> 4) zeroes -= 4, n >>= 4; + if (n >> 16) { + zeroes -= 16; + n >>= 16; + } + if (n >> 8) { + zeroes -= 8; + n >>= 8; + } + if (n >> 4) { + zeroes -= 4; + n >>= 4; + } return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes; } @@ -189,7 +212,7 @@ ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32(uint32_t n) { #undef ABSL_BASE_INTERNAL_FORCEINLINE } // namespace base_internal -} // inline namespace lts_2019_08_08 +ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_BASE_INTERNAL_BITS_H_ |