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[PM] Refactor the core logic to run EarlyCSE over a function into an

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object that manages a single run of this pass.

This was already essentially how it worked. Within the run function, it
would point members at *stack local* allocations that were only live for
a single run. Instead, it seems much cleaner to have a utility object
whose lifetime is clearly bounded by the run of the pass over the
function and can use member variables in a more direct way.

This also makes it easy to plumb the analyses used into it from the pass
and will make it re-usable with the new pass manager.

No functionality changed here, its just a refactoring.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227162 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth
2015-01-27 01:34:14 +00:00
parent ac33b1f5b3
commit b63fed3b97
3 changed files with 96 additions and 77 deletions
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2
include/llvm/InitializePasses.h
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@@ -129,7 +129,7 @@ void initializeThreadSanitizerPass(PassRegistry&);
void initializeSanitizerCoverageModulePass(PassRegistry&);
void initializeDataFlowSanitizerPass(PassRegistry&);
void initializeScalarizerPass(PassRegistry&);
void initializeEarlyCSEPass(PassRegistry&);
void initializeEarlyCSELegacyPassPass(PassRegistry &);
void initializeExpandISelPseudosPass(PassRegistry&);
void initializeFunctionAttrsPass(PassRegistry&);
void initializeGCMachineCodeAnalysisPass(PassRegistry&);