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Revert "enable the SLP Vectorizer optimization pass by default" #27049

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May 10, 2018
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Revert "enable the SLP Vectorizer optimization pass by default" #27049

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3 changes: 0 additions & 3 deletions NEWS.md
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Original file line number Diff line number Diff line change
Expand Up @@ -666,9 +666,6 @@ Compiler/Runtime improvements
* Inference now propagates constants inter-procedurally, and can compute
various constants expressions at compile-time ([#24362]).

* The LLVM SLP Vectorizer optimization pass is now enabled at the default
optimization level.

Deprecated or removed
---------------------

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9 changes: 7 additions & 2 deletions src/jitlayers.cpp
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Expand Up @@ -252,9 +252,14 @@ void addOptimizationPasses(legacy::PassManagerBase *PM, int opt_level, bool dump
PM->add(createLoopIdiomPass());
PM->add(createLoopDeletionPass()); // Delete dead loops
PM->add(createJumpThreadingPass()); // Thread jumps
PM->add(createSLPVectorizerPass()); // Vectorize straight-line code

if (opt_level >= 3) {
PM->add(createSLPVectorizerPass()); // Vectorize straight-line code
}

PM->add(createAggressiveDCEPass()); // Delete dead instructions
PM->add(createInstructionCombiningPass()); // Clean up after SLP loop vectorizer
if (opt_level >= 3)
PM->add(createInstructionCombiningPass()); // Clean up after SLP loop vectorizer
PM->add(createLoopVectorizePass()); // Vectorize loops
PM->add(createInstructionCombiningPass()); // Clean up after loop vectorizer
// LowerPTLS removes an indirect call. As a result, it is likely to trigger
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