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author | Chris Lattner <sabre@nondot.org> | 2009-11-01 19:09:12 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2009-11-01 19:09:12 +0000 |
commit | c92712184faf007afa28503da77e9a962dceb8cc (patch) | |
tree | 309be57398cfef6ea5238a0611ca6263adb058f2 /include | |
parent | ec4c7b976645cc49ccfe8dc1c3bfc31ec5fedc62 (diff) | |
download | external_llvm-c92712184faf007afa28503da77e9a962dceb8cc.zip external_llvm-c92712184faf007afa28503da77e9a962dceb8cc.tar.gz external_llvm-c92712184faf007afa28503da77e9a962dceb8cc.tar.bz2 |
only run GlobalDCE at -O3 and run it late instead of early.
GlobalOpt already deletes trivially dead functions/globals,
so GlobalDCE only adds values for cycles of dead things.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85731 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
-rw-r--r-- | include/llvm/Support/StandardPasses.h | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/include/llvm/Support/StandardPasses.h b/include/llvm/Support/StandardPasses.h index d7a3dc0..ff0a6d6 100644 --- a/include/llvm/Support/StandardPasses.h +++ b/include/llvm/Support/StandardPasses.h @@ -99,7 +99,7 @@ namespace llvm { PM->add(createCFGSimplificationPass()); // Clean up disgusting code if (UnitAtATime) { PM->add(createGlobalOptimizerPass()); // Optimize out global vars - PM->add(createGlobalDCEPass()); // Remove unused fns and globs + PM->add(createIPSCCPPass()); // IP SCCP PM->add(createDeadArgEliminationPass()); // Dead argument elimination } @@ -149,10 +149,15 @@ namespace llvm { if (UnitAtATime) { PM->add(createStripDeadPrototypesPass()); // Get rid of dead prototypes PM->add(createDeadTypeEliminationPass()); // Eliminate dead types - } - if (OptimizationLevel > 1 && UnitAtATime) - PM->add(createConstantMergePass()); // Merge dup global constants + // GlobalOpt already deletes dead functions and globals, at -O3 try a + // late pass of GlobalDCE. It is capable of deleting dead cycles. + if (OptimizationLevel > 2) + PM->add(createGlobalDCEPass()); // Remove dead fns and globals. + + if (OptimizationLevel > 1) + PM->add(createConstantMergePass()); // Merge dup global constants + } } static inline void addOnePass(PassManager *PM, Pass *P, bool AndVerify) { |