mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-23 02:29:18 +00:00
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). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194950 91177308-0d34-0410-b5e6-96231b3b80d8 |
||
---|---|---|
.. | ||
AlignOfTest.cpp | ||
AllocatorTest.cpp | ||
ArrayRecyclerTest.cpp | ||
BlockFrequencyTest.cpp | ||
Casting.cpp | ||
CMakeLists.txt | ||
CommandLineTest.cpp | ||
CompressionTest.cpp | ||
ConstantRangeTest.cpp | ||
ConvertUTFTest.cpp | ||
DataExtractorTest.cpp | ||
EndianTest.cpp | ||
ErrorOrTest.cpp | ||
FileOutputBufferTest.cpp | ||
formatted_raw_ostream_test.cpp | ||
LeakDetectorTest.cpp | ||
LockFileManagerTest.cpp | ||
Makefile | ||
ManagedStatic.cpp | ||
MathExtrasTest.cpp | ||
MD5Test.cpp | ||
MemoryBufferTest.cpp | ||
MemoryTest.cpp | ||
Path.cpp | ||
ProcessTest.cpp | ||
ProgramTest.cpp | ||
raw_ostream_test.cpp | ||
RegexTest.cpp | ||
SourceMgrTest.cpp | ||
SwapByteOrderTest.cpp | ||
TimeValueTest.cpp | ||
UnicodeTest.cpp | ||
ValueHandleTest.cpp | ||
YAMLIOTest.cpp | ||
YAMLParserTest.cpp |