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author | Logan Chien <tzuhsiang.chien@gmail.com> | 2014-02-22 15:39:39 +0000 |
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committer | Logan Chien <tzuhsiang.chien@gmail.com> | 2014-02-22 15:39:39 +0000 |
commit | 3c288fc8e72b8541a599c8396104988fe907499c (patch) | |
tree | 1d18d4adda5a437818798fe363600289368c386d /lib/Support | |
parent | 80668d18e8064560bb6c227cde4e2a01d32e683e (diff) | |
download | llvm-3c288fc8e72b8541a599c8396104988fe907499c.tar.gz llvm-3c288fc8e72b8541a599c8396104988fe907499c.tar.bz2 llvm-3c288fc8e72b8541a599c8396104988fe907499c.tar.xz |
Don't inline get[S|U]LEB128Size() until they are proved to be hot.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201939 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Support')
-rw-r--r-- | lib/Support/CMakeLists.txt | 1 | ||||
-rw-r--r-- | lib/Support/LEB128.cpp | 44 |
2 files changed, 45 insertions, 0 deletions
diff --git a/lib/Support/CMakeLists.txt b/lib/Support/CMakeLists.txt index 5d533dea65..1ba1c76f71 100644 --- a/lib/Support/CMakeLists.txt +++ b/lib/Support/CMakeLists.txt @@ -31,6 +31,7 @@ add_llvm_library(LLVMSupport IntrusiveRefCntPtr.cpp IsInf.cpp IsNAN.cpp + LEB128.cpp LineIterator.cpp Locale.cpp LockFileManager.cpp diff --git a/lib/Support/LEB128.cpp b/lib/Support/LEB128.cpp new file mode 100644 index 0000000000..449626f2d4 --- /dev/null +++ b/lib/Support/LEB128.cpp @@ -0,0 +1,44 @@ +//===- LEB128.cpp - LEB128 utility functions implementation -----*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements some utility functions for encoding SLEB128 and +// ULEB128 values. +// +//===----------------------------------------------------------------------===// + +#include "llvm/Support/LEB128.h" + +namespace llvm { + +/// Utility function to get the size of the ULEB128-encoded value. +unsigned getULEB128Size(uint64_t Value) { + unsigned Size = 0; + do { + Value >>= 7; + Size += sizeof(int8_t); + } while (Value); + return Size; +} + +/// Utility function to get the size of the SLEB128-encoded value. +unsigned getSLEB128Size(int64_t Value) { + unsigned Size = 0; + int Sign = Value >> (8 * sizeof(Value) - 1); + bool IsMore; + + do { + unsigned Byte = Value & 0x7f; + Value >>= 7; + IsMore = Value != Sign || ((Byte ^ Sign) & 0x40) != 0; + Size += sizeof(int8_t); + } while (IsMore); + return Size; +} + +} // namespace llvm |