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WIP: Do SROA and DSE in alloc-opt #24478

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WIP: Do SROA and DSE in alloc-opt #24478

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17019a0
Fix GC preserve optimization
yuyichao Nov 4, 2017
9550c99
Cleanup and reorganize llvm-alloc-opt
yuyichao Nov 3, 2017
426361a
Do SROA and DSE in alloc-opt
yuyichao Nov 3, 2017
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13 changes: 13 additions & 0 deletions src/jitlayers.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -192,6 +192,11 @@ void addOptimizationPasses(legacy::PassManagerBase *PM, int opt_level, bool dump

PM->add(createEarlyCSEPass()); //// ****

#if JL_LLVM_VERSION >= 50000
// Load forwarding above can expose allocations that aren't actually used
// remove those before optimizing loops.
PM->add(createAllocOptPass());
#endif
PM->add(createLoopIdiomPass()); //// ****
PM->add(createLoopRotatePass()); // Rotate loops.
#ifdef USE_POLLY
Expand All @@ -214,6 +219,10 @@ void addOptimizationPasses(legacy::PassManagerBase *PM, int opt_level, bool dump
PM->add(createSimpleLoopUnrollPass()); // Unroll small loops
//PM->add(createLoopStrengthReducePass()); // (jwb added)

#if JL_LLVM_VERSION >= 50000
// Run our own SROA on heap objects before LLVM's
PM->add(createAllocOptPass());
#endif
// Re-run SROA after loop-unrolling (useful for small loops that operate,
// over the structure of an aggregate)
PM->add(createSROAPass()); // Break up aggregate allocas
Expand All @@ -230,6 +239,10 @@ void addOptimizationPasses(legacy::PassManagerBase *PM, int opt_level, bool dump
PM->add(createJumpThreadingPass()); // Thread jumps
PM->add(createDeadStoreEliminationPass()); // Delete dead stores

#if JL_LLVM_VERSION >= 50000
// More dead allocation (store) deletion before loop optimization
PM->add(createAllocOptPass());
#endif
// see if all of the constant folding has exposed more loops
// to simplification and deletion
// this helps significantly with cleaning up iteration
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