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RegisterPasses: Rework comments slightly 

llvm-svn: 138428
This commit is contained in:
Tobias Grosser 2011-08-24 07:33:05 +00:00
parent de92622aa5
commit 3df9c76d5c
1 changed files with 12 additions and 9 deletions
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21
polly/lib/RegisterPasses.cpp
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@ -39,8 +39,9 @@ static void registerPollyPasses(const llvm::PassManagerBuilder &Builder,
initializeAliasAnalysisAnalysisGroup(Registry);
// A standard set of optimization passes partially taken/copied from the
// set of default optimization passes. This set of passes is most probably
// not yet optimal. TODO: Investigate optimal set of passes.
// set of default optimization passes. It is used to bring the code into
// a canonical form that can than be analyzed by Polly. This set of passes is
// most probably not yet optimal. TODO: Investigate optimal set of passes.
PM.add(llvm::createPromoteMemoryToRegisterPass());
PM.add(llvm::createInstructionCombiningPass()); // Clean up after IPCP & DAE
PM.add(llvm::createCFGSimplificationPass()); // Clean up after IPCP & DAE
@ -55,13 +56,14 @@ static void registerPollyPasses(const llvm::PassManagerBuilder &Builder,
PM.add(polly::createCodePreperationPass());
PM.add(polly::createRegionSimplifyPass());
// FIXME: Needed as RegionSimplifyPass does destroy canonical induction
// variables. (It changes the order of the operands in the PHI nodes)
// FIXME: Needed as RegionSimplifyPass destroys the canonical form of
// induction variables (It changes the order of the operands in the
// PHI nodes).
PM.add(llvm::createIndVarSimplifyPass());
PM.add(polly::createScopDetectionPass());
PM.add(polly::createIndependentBlocksPass());
// FIXME: We should not need to schedule this passes (and some more)
// FIXME: We should not need to schedule passes like the TempScopInfoPass
// explicitally, as it is alread required by the ScopInfo pass.
// However, without this clang crashes because of unitialized passes.
PM.add(polly::createTempScopInfoPass());
@ -72,10 +74,11 @@ static void registerPollyPasses(const llvm::PassManagerBuilder &Builder,
PM.add(polly::createCodeGenerationPass());
}
// Execute Polly together with a set of preparing passes before all other
// optimizations. This is basically to be executed before any loop optimizer
// passes like LICM or LoopIdomPass. Those would complicate the code such that
// Polly would recognize less scops.
// Execute Polly together with a set of preparing passes.
//
// We run Polly that early to run before loop optimizer passes like LICM or
// the LoopIdomPass. Both transform the code in a way that Polly will recognize
// less scops.
static llvm::RegisterStandardPasses
PassRegister(llvm::PassManagerBuilder::EP_EarlyAsPossible,
registerPollyPasses);