From fba8a316c30690097de5d6127ad307d84a1b74ca Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Tue, 31 Mar 2020 12:32:35 -0700 Subject: Export of internal Abseil changes -- 2dd5008c7b4176859e320c7c337078adb173b662 by Tom Manshreck : Internal change PiperOrigin-RevId: 304022549 -- 6442abd78697b03cfe698b0d0dac7f1eb4b5cb38 by Andy Getzendanner : Internal change PiperOrigin-RevId: 303890410 -- eb8b37b468b0f23da09d3de714272928ef61f942 by Gennadiy Rozental : Roll changes forward with ChunkIterator templatized. This should facilitate usage of "small" chunk iterator for a regular usage and proper "big" iterator internally in Cord implementation. This way Cord users are not exposed to stack size overhead if they have a lot of chunk iterators or recursive implementation which relies on chunk iterators. PiperOrigin-RevId: 303877118 -- 9623c569e7c55b45254e95f2d14c5badf9c901aa by Gennadiy Rozental : Switch Flags implementation of fast type id to use absl/base/internal/fast_type_id.h PiperOrigin-RevId: 303861019 -- e2931e8d53c86d0816da6bbc8ba58cf5a3a443bb by Matthew Brown : Internal Change PiperOrigin-RevId: 303832407 -- b549ed6e441e920b8ad6f02a80b9fd543820ef86 by Tom Manshreck : Update Cord header file comments to Abseil standards PiperOrigin-RevId: 303823232 -- fc633d4f31a2d058f2b6a7029fc7c9820cd71c92 by Evan Brown : Remove top-level const from K/V in map_slot_type::mutable_value and map_slot_type::key. This allows us to move between `map_slot_type::mutable_value`s internally even when the key_type and/or mapped_type specified by the user are const. PiperOrigin-RevId: 303811694 -- 909b3ce7cb3583ee9c374d36ff5f82bba02a1b64 by Derek Mauro : Add hardening assertions to the preconditions of absl::Cord PiperOrigin-RevId: 303419537 -- 9d32f79eabd54e6cb17bcc28b53e9bcfeb3cf6f4 by Greg Falcon : Don't use MSVC-specific bit manipulations when using Clang on Windows. This fixes a compiler warning. Note that we do not have continuous testing for this configuration; this CL is best-effort support. PiperOrigin-RevId: 303322582 -- f6e0a35a2b9081d2a9eef73789b7bc1b5e46e5ad by Gennadiy Rozental : Introduce standlone FastTypeId utility to represent compile time unique type id. PiperOrigin-RevId: 303180545 -- 99120e9fbdb5b2d327139ab8f617533d7bc3345b by Abseil Team : Changed absl's import of std::string_view to using string_view = std::string_view. This should help tools (e.g. include-what-you-use) discover where absl::string_view is defined. PiperOrigin-RevId: 303169095 GitOrigin-RevId: 2dd5008c7b4176859e320c7c337078adb173b662 Change-Id: I1e18ae08e23686ac963e7ea5e5bd499e18d51048 --- absl/base/internal/bits.h | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) (limited to 'absl/base/internal/bits.h') diff --git a/absl/base/internal/bits.h b/absl/base/internal/bits.h index 8b03453c184f..14c51d8b3013 100644 --- a/absl/base/internal/bits.h +++ b/absl/base/internal/bits.h @@ -24,7 +24,7 @@ // Clang on Windows has __builtin_clzll; otherwise we need to use the // windows intrinsic functions. -#if defined(_MSC_VER) +#if defined(_MSC_VER) && !defined(__clang__) #include #if defined(_M_X64) #pragma intrinsic(_BitScanReverse64) @@ -36,7 +36,7 @@ #include "absl/base/attributes.h" -#if defined(_MSC_VER) +#if defined(_MSC_VER) && !defined(__clang__) // We can achieve something similar to attribute((always_inline)) with MSVC by // using the __forceinline keyword, however this is not perfect. MSVC is // much less aggressive about inlining, and even with the __forceinline keyword. @@ -73,14 +73,14 @@ ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64Slow(uint64_t n) { } ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64(uint64_t n) { -#if defined(_MSC_VER) && defined(_M_X64) +#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_X64) // MSVC does not have __buitin_clzll. Use _BitScanReverse64. unsigned long result = 0; // NOLINT(runtime/int) if (_BitScanReverse64(&result, n)) { return 63 - result; } return 64; -#elif defined(_MSC_VER) +#elif defined(_MSC_VER) && !defined(__clang__) // MSVC does not have __buitin_clzll. Compose two calls to _BitScanReverse unsigned long result = 0; // NOLINT(runtime/int) if ((n >> 32) && _BitScanReverse(&result, n >> 32)) { @@ -90,7 +90,7 @@ ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64(uint64_t n) { return 63 - result; } return 64; -#elif defined(__GNUC__) +#elif defined(__GNUC__) || defined(__clang__) // Use __builtin_clzll, which uses the following instructions: // x86: bsr // ARM64: clz @@ -126,13 +126,13 @@ ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32Slow(uint64_t n) { } ABSL_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32(uint32_t n) { -#if defined(_MSC_VER) +#if defined(_MSC_VER) && !defined(__clang__) unsigned long result = 0; // NOLINT(runtime/int) if (_BitScanReverse(&result, n)) { return 31 - result; } return 32; -#elif defined(__GNUC__) +#elif defined(__GNUC__) || defined(__clang__) // Use __builtin_clz, which uses the following instructions: // x86: bsr // ARM64: clz @@ -163,11 +163,11 @@ ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64Slow(uint64_t n) { } ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64(uint64_t n) { -#if defined(_MSC_VER) && defined(_M_X64) +#if defined(_MSC_VER) && !defined(__clang__) && defined(_M_X64) unsigned long result = 0; // NOLINT(runtime/int) _BitScanForward64(&result, n); return result; -#elif defined(_MSC_VER) +#elif defined(_MSC_VER) && !defined(__clang__) unsigned long result = 0; // NOLINT(runtime/int) if (static_cast(n) == 0) { _BitScanForward(&result, n >> 32); @@ -175,7 +175,7 @@ ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64(uint64_t n) { } _BitScanForward(&result, n); return result; -#elif defined(__GNUC__) +#elif defined(__GNUC__) || defined(__clang__) static_assert(sizeof(unsigned long long) == sizeof(n), // NOLINT(runtime/int) "__builtin_ctzll does not take 64-bit arg"); return __builtin_ctzll(n); @@ -196,11 +196,11 @@ ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32Slow(uint32_t n) { } ABSL_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32(uint32_t n) { -#if defined(_MSC_VER) +#if defined(_MSC_VER) && !defined(__clang__) unsigned long result = 0; // NOLINT(runtime/int) _BitScanForward(&result, n); return result; -#elif defined(__GNUC__) +#elif defined(__GNUC__) || defined(__clang__) static_assert(sizeof(int) == sizeof(n), "__builtin_ctz does not take 32-bit arg"); return __builtin_ctz(n); -- cgit 1.4.1