[llvm-commits] [llvm] r131820 - /llvm/trunk/include/llvm/Support/PassManagerBuilder.h
Chris Lattner
sabre at nondot.org
Sat May 21 17:14:20 PDT 2011
Author: lattner
Date: Sat May 21 19:14:20 2011
New Revision: 131820
URL: http://llvm.org/viewvc/llvm-project?rev=131820&view=rev
Log:
add support for LTO passes.
Modified:
llvm/trunk/include/llvm/Support/PassManagerBuilder.h
Modified: llvm/trunk/include/llvm/Support/PassManagerBuilder.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/PassManagerBuilder.h?rev=131820&r1=131819&r2=131820&view=diff
==============================================================================
--- llvm/trunk/include/llvm/Support/PassManagerBuilder.h (original)
+++ llvm/trunk/include/llvm/Support/PassManagerBuilder.h Sat May 21 19:14:20 2011
@@ -240,6 +240,81 @@
MPM.add(createConstantMergePass()); // Merge dup global constants
}
}
+
+ void populateLTOPassManager(PassManagerBase &PM, bool Internalize,
+ bool RunInliner) {
+ // Provide AliasAnalysis services for optimizations.
+ addInitialAliasAnalysisPasses(PM);
+
+ // Now that composite has been compiled, scan through the module, looking
+ // for a main function. If main is defined, mark all other functions
+ // internal.
+ if (Internalize)
+ PM.add(createInternalizePass(true));
+
+ // Propagate constants at call sites into the functions they call. This
+ // opens opportunities for globalopt (and inlining) by substituting function
+ // pointers passed as arguments to direct uses of functions.
+ PM.add(createIPSCCPPass());
+
+ // Now that we internalized some globals, see if we can hack on them!
+ PM.add(createGlobalOptimizerPass());
+
+ // Linking modules together can lead to duplicated global constants, only
+ // keep one copy of each constant.
+ PM.add(createConstantMergePass());
+
+ // Remove unused arguments from functions.
+ PM.add(createDeadArgEliminationPass());
+
+ // Reduce the code after globalopt and ipsccp. Both can open up significant
+ // simplification opportunities, and both can propagate functions through
+ // function pointers. When this happens, we often have to resolve varargs
+ // calls, etc, so let instcombine do this.
+ PM.add(createInstructionCombiningPass());
+
+ // Inline small functions
+ if (RunInliner)
+ PM.add(createFunctionInliningPass());
+
+ PM.add(createPruneEHPass()); // Remove dead EH info.
+
+ // Optimize globals again if we ran the inliner.
+ if (RunInliner)
+ PM.add(createGlobalOptimizerPass());
+ PM.add(createGlobalDCEPass()); // Remove dead functions.
+
+ // If we didn't decide to inline a function, check to see if we can
+ // transform it to pass arguments by value instead of by reference.
+ PM.add(createArgumentPromotionPass());
+
+ // The IPO passes may leave cruft around. Clean up after them.
+ PM.add(createInstructionCombiningPass());
+ PM.add(createJumpThreadingPass());
+ // Break up allocas
+ PM.add(createScalarReplAggregatesPass());
+
+ // Run a few AA driven optimizations here and now, to cleanup the code.
+ PM.add(createFunctionAttrsPass()); // Add nocapture.
+ PM.add(createGlobalsModRefPass()); // IP alias analysis.
+
+ PM.add(createLICMPass()); // Hoist loop invariants.
+ PM.add(createGVNPass()); // Remove redundancies.
+ PM.add(createMemCpyOptPass()); // Remove dead memcpys.
+ // Nuke dead stores.
+ PM.add(createDeadStoreEliminationPass());
+
+ // Cleanup and simplify the code after the scalar optimizations.
+ PM.add(createInstructionCombiningPass());
+
+ PM.add(createJumpThreadingPass());
+
+ // Delete basic blocks, which optimization passes may have killed.
+ PM.add(createCFGSimplificationPass());
+
+ // Now that we have optimized the program, discard unreachable functions.
+ PM.add(createGlobalDCEPass());
+ }
};
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