Eli Friedman b42a626122 PR2621: Improvements to the SCEV AddRec binomial expansion. This ... version uses a new algorithm for evaluating the binomial coefficients which is significantly more efficient for AddRecs of more than 2 terms (see the comments in the code for details on how the algorithm works). It also fixes some bugs: it removes the arbitrary length restriction for AddRecs, it fixes the silent generation of incorrect code for AddRecs which require a wide calculation width, and it fixes an issue where we were incorrectly truncating the iteration count too far when evaluating an AddRec expression narrower than the induction variable. There are still a few related issues I know of: I think there's still an issue with the SCEVExpander expansion of AddRec in terms of the width of the induction variable used. The hack to avoid generating too-wide integers shouldn't be necessary; instead, the callers should be considering the cost of the expansion before expanding it (in addition to not expanding too-wide integers, we might not want to expand expressions that are really expensive, especially when optimizing for size; calculating an length-17 32-bit AddRec currently generates about 250 instructions of straight-line code on X86). Also, for long 32-bit AddRecs on X86, CodeGen really sucks at scheduling the code. I'm planning on filing follow-up PRs for these issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54332 91177308-0d34-0410-b5e6-96231b3b80d8		2008-08-04 23:49:06 +00:00
..
IPA
AliasAnalysis.cpp
AliasAnalysisCounter.cpp
AliasAnalysisEvaluator.cpp
AliasDebugger.cpp
AliasSetTracker.cpp
Analysis.cpp
BasicAliasAnalysis.cpp
CFGPrinter.cpp
ConstantFolding.cpp	Fix minor issues with VICmp/VFCmp constant expressions	2008-07-25 17:35:37 +00:00
InstCount.cpp
Interval.cpp
IntervalPartition.cpp
LibCallAliasAnalysis.cpp
LibCallSemantics.cpp
LoadValueNumbering.cpp	Use find instead of lower_bound.	2008-07-11 20:58:19 +00:00
LoopInfo.cpp
LoopPass.cpp	Fix spelling of "hierarchy" in comments.	2008-07-11 22:51:32 +00:00
LoopVR.cpp	Add a value range analysis that lazily computes ranges using ScalarEvolutions.	2008-06-30 00:04:21 +00:00
Makefile
MemoryDependenceAnalysis.cpp	Fix a subtle bug when removing instructions from memdep. In very specific	2008-07-28 16:00:58 +00:00
PostDominators.cpp
ProfileInfo.cpp
ProfileInfoLoader.cpp
ProfileInfoLoaderPass.cpp
ScalarEvolution.cpp	PR2621: Improvements to the SCEV AddRec binomial expansion. This	2008-08-04 23:49:06 +00:00
ScalarEvolutionExpander.cpp	Expand SCEVUDiv of power of 2 to a lshr instruction.	2008-07-08 05:05:37 +00:00
SparsePropagation.cpp
Trace.cpp
ValueNumbering.cpp
ValueTracking.cpp	Don't use ++idx_begin when I actually mean idx_begin + 1, especially since we	2008-07-16 10:47:35 +00:00