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Diffstat (limited to 'src/3rdparty/v8/src/misc-intrinsics.h')
-rw-r--r-- | src/3rdparty/v8/src/misc-intrinsics.h | 89 |
1 files changed, 0 insertions, 89 deletions
diff --git a/src/3rdparty/v8/src/misc-intrinsics.h b/src/3rdparty/v8/src/misc-intrinsics.h deleted file mode 100644 index c1da8a9..0000000 --- a/src/3rdparty/v8/src/misc-intrinsics.h +++ /dev/null @@ -1,89 +0,0 @@ -// Copyright 2011 the V8 project authors. All rights reserved. -// Redistribution and use in source and binary forms, with or without -// modification, are permitted provided that the following conditions are -// met: -// -// * Redistributions of source code must retain the above copyright -// notice, this list of conditions and the following disclaimer. -// * Redistributions in binary form must reproduce the above -// copyright notice, this list of conditions and the following -// disclaimer in the documentation and/or other materials provided -// with the distribution. -// * Neither the name of Google Inc. nor the names of its -// contributors may be used to endorse or promote products derived -// from this software without specific prior written permission. -// -// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS -// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT -// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR -// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT -// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, -// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT -// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, -// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY -// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE -// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - -#ifndef V8_MISC_INTRINSICS_H_ -#define V8_MISC_INTRINSICS_H_ - -#include "../include/v8.h" -#include "globals.h" - -namespace v8 { -namespace internal { - -// Returns the index of the leading 1 bit, counting the least significant bit at -// index 0. (1 << IntegerLog2(x)) is a mask for the most significant bit of x. -// Result is undefined if input is zero. -int IntegerLog2(uint32_t value); - -#if defined(__GNUC__) - -inline int IntegerLog2(uint32_t value) { - return 31 - __builtin_clz(value); -} - -#elif defined(_MSC_VER) && !defined(_WIN32_WCE) - -#pragma intrinsic(_BitScanReverse) - -inline int IntegerLog2(uint32_t value) { - unsigned long result; // NOLINT: MSVC intrinsic demands this type. - _BitScanReverse(&result, value); - return result; -} - -#else - -// Default version using regular operations. Code taken from: -// http://graphics.stanford.edu/~seander/bithacks.html#IntegerLog -inline int IntegerLog2(uint32_t value) { - int result, shift; - - shift = (value > 0xFFFF) << 4; - value >>= shift; - result = shift; - - shift = (value > 0xFF) << 3; - value >>= shift; - result |= shift; - - shift = (value > 0xF) << 2; - value >>= shift; - result |= shift; - - shift = (value > 0x3) << 1; - value >>= shift; - result |= shift; - - result |= (value >> 1); - - return result; -} -#endif - -} } // namespace v8::internal - -#endif // V8_MISC_INTRINSICS_H_ |