From 5e7d459eeca7bc53deab0ee9634601386b53d7c0 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Thu, 23 Aug 2018 10:41:14 -0700 Subject: Export of internal Abseil changes. -- 2dcf3ec79f961d2962cdad33ac4bfbcb14126dad by Abseil Team : Consolidate implementations of CountLeadingZeros and add new ones for CountTrailingZeros. Internal APIs only. PiperOrigin-RevId: 209961247 -- 4f3ac87c6928dab26faff962bb18aade9383f184 by Jorg Brown : Fix absl::CUnescape not to write to const_cast(str->data()), which does the wrong thing if the string type is copy-on-write PiperOrigin-RevId: 209957656 -- c5103067be19dc88a4c32e5306154e5e3bba4673 by Tom Manshreck : Update comments in time library header files. PiperOrigin-RevId: 209829588 -- fe36f9b6150243d2ac88e2a892d84c565c18cd2f by Abseil Team : Clarifying the sample use of absl::LoadTimeZone function in the documentation. PiperOrigin-RevId: 209782218 GitOrigin-RevId: 2dcf3ec79f961d2962cdad33ac4bfbcb14126dad Change-Id: I3e2f87a8c543599b81eada58409a9bddc0b51ab8 --- absl/strings/internal/bits.h | 53 -------------------------------------------- 1 file changed, 53 deletions(-) delete mode 100644 absl/strings/internal/bits.h (limited to 'absl/strings/internal/bits.h') diff --git a/absl/strings/internal/bits.h b/absl/strings/internal/bits.h deleted file mode 100644 index 901082cc..00000000 --- a/absl/strings/internal/bits.h +++ /dev/null @@ -1,53 +0,0 @@ -// Copyright 2018 The Abseil Authors. -// -// Licensed under the Apache License, Version 2.0 (the "License"); -// you may not use this file except in compliance with the License. -// You may obtain a copy of the License at -// -// http://www.apache.org/licenses/LICENSE-2.0 -// -// Unless required by applicable law or agreed to in writing, software -// distributed under the License is distributed on an "AS IS" BASIS, -// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. -// See the License for the specific language governing permissions and -// limitations under the License. - -#ifndef ABSL_STRINGS_INTERNAL_BITS_H_ -#define ABSL_STRINGS_INTERNAL_BITS_H_ - -#include - -#if defined(_MSC_VER) && defined(_M_X64) -#include -#pragma intrinsic(_BitScanReverse64) -#endif - -namespace absl { -namespace strings_internal { - -// Returns the number of leading 0 bits in a 64-bit value. -inline int CountLeadingZeros64(uint64_t n) { -#if defined(__GNUC__) - static_assert(sizeof(unsigned long long) == sizeof(n), // NOLINT(runtime/int) - "__builtin_clzll does not take 64bit arg"); - return n == 0 ? 64 : __builtin_clzll(n); -#elif defined(_MSC_VER) && defined(_M_X64) - unsigned long result; // NOLINT(runtime/int) - if (_BitScanReverse64(&result, n)) { - return 63 - result; - } - return 64; -#else - 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; - return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0\0"[n] + zeroes; -#endif -} - -} // namespace strings_internal -} // namespace absl - -#endif // ABSL_STRINGS_INTERNAL_BITS_H_ -- cgit v1.2.3