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Author SHA1 Message Date
Jakob Stoklund Olesen 6e630d46d2 Print block frequencies in decimal form. 
This is easier to read than the internal fixed-point representation.

If anybody knows the correct algorithm for converting fixed-point
numbers to base 10, feel free to fix it.

llvm-svn: 184881
 2013-06-25 21:57:38 +00:00
Benjamin Kramer bfb84d0bd6 Revert "BlockFrequency: Saturate at 1 instead of 0 when multiplying a frequency with a branch probability." 
This reverts commit r184584. Breaks PPC selfhost.

llvm-svn: 184590
 2013-06-21 20:20:27 +00:00
Benjamin Kramer bd0f107929 BlockFrequency: Saturate at 1 instead of 0 when multiplying a frequency with a branch probability. 
Zero is used by BlockFrequencyInfo as a special "don't know" value. It also
causes a sink for frequencies as you can't ever get off a zero frequency with
more multiplies.

This recovers a 10% regression on MultiSource/Benchmarks/7zip. A zero frequency
was propagated into an inner loop causing excessive spilling.

PR16402.

llvm-svn: 184584
 2013-06-21 19:30:05 +00:00
Benjamin Kramer 2aed4393b8 BlockFrequency: Use a smarter overflow check. 
This trades one 64 bit div for one 64 bit mul and some arithmetic.

llvm-svn: 143106
 2011-10-27 16:38:50 +00:00
Jakub Staszak 9b8a6a3b2b Optimize 96-bit division a little bit. 
llvm-svn: 136222
 2011-07-27 16:00:40 +00:00
Jakub Staszak a9e8aa0482 Move static methods to the anonymous namespace. 
llvm-svn: 136221
 2011-07-27 15:51:51 +00:00
Jakub Staszak 49993f26bf Add BlockFrequency class. 
llvm-svn: 135992
 2011-07-25 22:24:51 +00:00