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author | 2019-11-18 11:02:26 -0800 | |
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committer | 2019-11-19 10:27:57 -0500 | |
commit | 2103fd9acdf58279f739860bff3f8c9f4b845605 (patch) | |
tree | 8eee8ff910c004b517eb02c79feac753fe19126e /absl/base/internal/bits.h | |
parent | 3df7b52a6ada51a72a23796b844549a7b282f1b8 (diff) |
Export of internal Abseil changes
--
d447fdcb801036cf08197eece193a5a706661120 by Gennadiy Rozental <rogeeff@google.com>:
Eliminate the need for static function holding help message. This decreases the cost of ABSL_FLAG abstraction by 120 bytes under clang.
PiperOrigin-RevId: 281107806
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0aa6b91189f0e8b2381438c33465673a7ae02487 by Derek Mauro <dmauro@google.com>:
Disable the weak symbol CCTZ extension in the time test_util
on MinGW, which does not support it.
PiperOrigin-RevId: 280719769
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67322c41c3e776eb541de90fa4526bdb49422eb6 by Abseil Team <absl-team@google.com>:
Tune PeriodicSampler implementation (for internal-use only)
PiperOrigin-RevId: 280708943
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3a48c346340c7ed03816645cd327e1ff07729aa4 by Abseil Team <absl-team@google.com>:
Clean up public headers not to have warnings for "-Wcomma"
PiperOrigin-RevId: 280695373
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981acd1ef3b13a83a84f04f11c8931f4ed4451c9 by Matthew Brown <matthewbr@google.com>:
Release absl::int128.
PiperOrigin-RevId: 280690817
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d30fae9d2ec30b81322d2eb5afe7e13e45b4b422 by Derek Mauro <dmauro@google.com>:
Fix -Wundef warnings in random platform detection
PiperOrigin-RevId: 280669598
GitOrigin-RevId: d447fdcb801036cf08197eece193a5a706661120
Change-Id: Ie5e10e567c54b7de211833607689f233d4ddf734
Diffstat (limited to 'absl/base/internal/bits.h')
-rw-r--r-- | absl/base/internal/bits.h | 35 |
1 files changed, 28 insertions, 7 deletions
diff --git a/absl/base/internal/bits.h b/absl/base/internal/bits.h index b0780f2d..450b923f 100644 --- a/absl/base/internal/bits.h +++ b/absl/base/internal/bits.h @@ -50,10 +50,22 @@ 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; } @@ -95,9 +107,18 @@ 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; } |