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54 Commits

Author SHA1 Message Date
Andrew Trick 3d4e64b082 Branch profiling: floating-point avoidance. 
Patch by: Jakub Staszak!

Introduces BranchProbability. Changes unsigned to uint32_t all over and
uint64_t only when overflow is expected.

llvm-svn: 132867
 2011-06-11 01:05:22 +00:00
Nick Lewycky 75b2053863 Fold assert-only-used variable into the assert. 
llvm-svn: 132620
 2011-06-04 02:07:10 +00:00
Andrew Trick c73aa1ee81 Missing include of climits in the new BranchProbability pass. 
llvm-svn: 132616
 2011-06-04 01:30:52 +00:00
Andrew Trick 49371f3f33 New BranchProbabilityInfo analysis. Patch by Jakub Staszak! 
BranchProbabilityInfo provides an interface for IR passes to query the
likelihood that control follows a CFG edge. This patch provides an
initial implementation of static branch predication that will populate
BranchProbabilityInfo for branches with no external profile
information using very simple heuristics. It currently isn't hooked up
to any external profile data, so static prediction does all the work.

llvm-svn: 132613
 2011-06-04 01:16:30 +00:00