add support for LTO passes.

llvm-svn: 131820
This commit is contained in:
Chris Lattner 2011-05-22 00:14:20 +00:00
parent c383dd2c87
commit 6e81571c48

View File

@ -240,6 +240,81 @@ public:
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());
}
};