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llvm-project/llvm/unittests/Support
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Michael Gottesman 4d078a3d6f [block-freq] Add BlockFrequency::scale that returns a remainder from the division and make the private scale in BlockFrequency more performant. 
This change is the first in a series of changes improving LLVM's Block
Frequency propogation implementation to not lose probability mass in
branchy code when propogating block frequency information from a basic
block to its successors. This patch is a simple infrastructure
improvement that does not actually modify the block frequency
algorithm. The specific changes are:

1. Changes the division algorithm used when scaling block frequencies by
branch probabilities to a short division algorithm. This gives us the
remainder for free as well as provides a nice speed boost. When I
benched the old routine and the new routine on a Sandy Bridge iMac with
disabled turbo mode performing 8192 iterations on an array of length
32768, I saw ~600% increase in speed in mean/median performance.

2. Exposes a scale method that returns a remainder. This is important so
we can ensure that when we scale a block frequency by some branch
probability BP = N/D, the remainder from the division by D can be
retrieved and propagated to other children to ensure no probability mass
is lost (more to come on this).

llvm-svn: 194950
 		2013-11-17 03:25:24 +00:00
..
AlignOfTest.cpp [AlignOf] Add AlignedCharArray and refactor AlignedCharArrayUnion. 2012-12-31 19:54:45 +00:00
AllocatorTest.cpp Sort the #include lines for unittest/... 2012-12-04 10:23:08 +00:00
ArrayRecyclerTest.cpp Rename the unittest from ArrayRecylerTest.cpp to ArrayRecyclerTest.cpp. 2013-01-05 02:08:43 +00:00
BlockFrequencyTest.cpp [block-freq] Add BlockFrequency::scale that returns a remainder from the division and make the private scale in BlockFrequency more performant. 2013-11-17 03:25:24 +00:00
CMakeLists.txt Make SourceMgr::PrintMessage() testable and add unit tests 2013-09-27 21:09:25 +00:00
Casting.cpp Fix a regression I introduced back in r178147. 2013-07-18 02:42:40 +00:00
CommandLineTest.cpp Implement TokenizeWindowsCommandLine. 2013-07-30 19:03:20 +00:00
CompressionTest.cpp Expose CRC-32 implementation from zlib 2013-08-14 16:03:29 +00:00
ConstantRangeTest.cpp make ConstantRange::signExtend() optimal 2013-10-30 15:36:50 +00:00
ConvertUTFTest.cpp [Support] Add a Unicode conversion wrapper from UTF16 to UTF8 2013-07-16 17:14:33 +00:00
DataExtractorTest.cpp DataExtractor: Fix integer truncation issues in LEB128 extraction. 2012-08-20 10:52:11 +00:00
EndianTest.cpp [Support][Endian] Add support for specifying the alignment and native unaligned types. 2013-01-02 20:14:11 +00:00
ErrorOrTest.cpp Simplify ErrorOr. 2013-11-05 00:28:01 +00:00
FileOutputBufferTest.cpp Add a convenience createUniqueDirectory function. 2013-06-27 03:45:31 +00:00
LeakDetectorTest.cpp
…
LockFileManagerTest.cpp Fix boolean logic in LockFileManager and test it 2013-08-07 01:22:04 +00:00
MD5Test.cpp Add support for adding the contents of a StringRef to the MD5 hash. 2013-05-31 22:34:56 +00:00
Makefile Update incorrect file headers. 2013-08-01 18:42:28 +00:00
ManagedStatic.cpp Get the unittests compiling when building with cmake and the setting 2013-05-14 13:29:16 +00:00
MathExtrasTest.cpp [Support] Remove Count{Leading,Trailing}Zeros_{32,64}. 2013-05-24 22:58:37 +00:00
MemoryBufferTest.cpp Change MemoryBuffer::getFile to take a Twine. 2013-10-25 19:06:52 +00:00
MemoryTest.cpp Go ahead and get rid of the old page size interface and convert all the 2012-12-31 23:31:56 +00:00
Path.cpp Path: Recognize COFF import library file magic. 2013-11-15 21:22:02 +00:00
ProcessTest.cpp Try to unbreak mingw32 buildbot. 2013-09-10 21:32:42 +00:00
ProgramTest.cpp Add non-blocking Wait() for launched processes 2013-10-01 14:28:18 +00:00
RegexTest.cpp Fix off-by-one error in Regex::isValid 2013-08-08 17:32:45 +00:00
SourceMgrTest.cpp SourceMgr diagnotics printing: fix a bug where printing a fixit for a source 2013-09-27 21:24:36 +00:00
SwapByteOrderTest.cpp
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TimeValueTest.cpp unittests/Support: Add TimeValue.Win32FILETIME, corresponding to r186374. 2013-07-16 02:44:23 +00:00
UnicodeTest.cpp Move generic isPrint and columnWidth implementations to a separate header/source to allow using both generic and system-dependent versions on win32. 2013-09-04 16:00:12 +00:00
ValueHandleTest.cpp Move all of the header files which are involved in modelling the LLVM IR 2013-01-02 11:36:10 +00:00
YAMLIOTest.cpp remove extra semicolon 2013-11-14 03:03:05 +00:00
YAMLParserTest.cpp Allow using MemoryBuffers with yaml::Stream directly. 2012-11-19 23:21:47 +00:00
formatted_raw_ostream_test.cpp Sort the #include lines for unittest/... 2012-12-04 10:23:08 +00:00
raw_ostream_test.cpp
…