Chandler Carruth ab1f4ef9a2 Add some optional passes around the vectorizer to both better prepare ... the IR going into it and to clean up the IR produced by the vectorizers. Note that these are *off by default* right now while folks collect data on whether the performance tradeoff is reasonable. In a build of the 'opt' binary, I see about 2% compile time regression due to this change on average. This is in my mind essentially the worst expected case: very little of the opt binary is going to *benefit* from these extra passes. I've seen several benchmarks improve in performance my small amounts due to running these passes, and there are certain (rare) cases where these passes make a huge difference by either enabling the vectorizer at all or by hoisting runtime checks out of the outer loop. My primary motivation is to prevent people from seeing runtime check overhead in benchmarks where the existing passes and optimizers would be able to eliminate that. I've chosen the sequence of passes based on the kinds of things that seem likely to be relevant for the code at each stage: rotaing loops for the vectorizer, finding correlated values, loop invariants, and unswitching opportunities from any runtime checks, and cleaning up commonalities exposed by the SLP vectorizer. I'll be pinging existing threads where some of these issues have come up and will start new threads to get folks to benchmark and collect data on whether this is the right tradeoff or we should do something else. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219644 91177308-0d34-0410-b5e6-96231b3b80d8		2014-10-14 00:31:29 +00:00
..
ArgumentPromotion.cpp	DebugInfo+DeadArgElimination: Ensure llvm::Function*s from debug info are updated even when DAE removes both varargs and non-varargs arguments on the same function.	2014-10-07 15:10:23 +00:00
BarrierNoopPass.cpp
CMakeLists.txt	Move -verify-use-list-order into llvm-uselistorder	2014-07-25 17:13:03 +00:00
ConstantMerge.cpp	Repace SmallPtrSet with SmallPtrSetImpl in function arguments to avoid needing to mention the size.	2014-08-21 05:55:13 +00:00
DeadArgumentElimination.cpp	DebugInfo+DeadArgElimination: Ensure llvm::Function*s from debug info are updated even when DAE removes both varargs and non-varargs arguments on the same function.	2014-10-07 15:10:23 +00:00
ExtractGV.cpp	GlobalValue: Assert symbols with local linkage have default visibility	2014-05-07 23:00:22 +00:00
FunctionAttrs.cpp	[optnone] Make the optnone attribute effective at suppressing function	2014-08-13 10:49:33 +00:00
GlobalDCE.cpp	GlobalDCE: Don't drop any COMDAT members	2014-10-07 07:07:19 +00:00
GlobalOpt.cpp	GlobalOpt: Don't drop unused memberes of a Comdat	2014-10-08 07:23:31 +00:00
InlineAlways.cpp	Add an Assumption-Tracking Pass	2014-09-07 12:44:26 +00:00
Inliner.cpp	Inliner: Non-local functions in COMDATs shouldn't be dropped	2014-10-08 19:32:32 +00:00
InlineSimple.cpp	Add an Assumption-Tracking Pass	2014-09-07 12:44:26 +00:00
Internalize.cpp	Use range based for loops to avoid needing to re-mention SmallPtrSet size.	2014-08-24 23:23:06 +00:00
IPConstantPropagation.cpp
IPO.cpp	Move -verify-use-list-order into llvm-uselistorder	2014-07-25 17:13:03 +00:00
LLVMBuild.txt
LoopExtractor.cpp	Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges."	2014-07-21 17:06:51 +00:00
Makefile
MergeFunctions.cpp	MergeFunctions: FunctionPtr has been renamed to FunctionNode.	2014-09-10 10:08:25 +00:00
PartialInlining.cpp	Revert "[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges."	2014-07-21 17:06:51 +00:00
PassManagerBuilder.cpp	Add some optional passes around the vectorizer to both better prepare	2014-10-14 00:31:29 +00:00
PruneEH.cpp
StripDeadPrototypes.cpp
StripSymbols.cpp	Revert "Revert "DI: Fold constant arguments into a single MDString""	2014-10-03 20:01:09 +00:00