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Patch from
https://github.com/JuliaLang/julia/commit/7df16be0.patch
fixes bad performance with LLVM 12
From 7df16be0bfafee6d304ee0690366fa33845cc8d6 Mon Sep 17 00:00:00 2001
From: Valentin Churavy <v.churavy@gmail.com>
Date: Wed, 12 May 2021 18:44:40 -0400
Subject: [PATCH] [LLVM] add correlated value propagation after jump threading
---
src/aotcompile.cpp | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/aotcompile.cpp b/src/aotcompile.cpp
index db3f9f4b0e22..4cc22d127528 100644
--- a/src/aotcompile.cpp
+++ b/src/aotcompile.cpp
@@ -692,6 +692,7 @@ void addOptimizationPasses(legacy::PassManagerBase *PM, int opt_level,
PM->add(createSROAPass());
PM->add(createInstSimplifyLegacyPass());
PM->add(createJumpThreadingPass());
+ PM->add(createCorrelatedValuePropagationPass());
PM->add(createReassociatePass());
@@ -743,6 +744,7 @@ void addOptimizationPasses(legacy::PassManagerBase *PM, int opt_level,
// loops over Union-typed arrays to vectorize.
PM->add(createInstructionCombiningPass());
PM->add(createJumpThreadingPass());
+ PM->add(createCorrelatedValuePropagationPass());
PM->add(createDeadStoreEliminationPass());
// More dead allocation (store) deletion before loop optimization
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