[PATCH] D130976: [NFC] Add option to disable the scalarizer pass.

[Thomas Symalla via Phabricator via llvm-commits]

tsymalla created this revision.
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This patch adds a new CLI option, which can be used to
disable the scalarizer pass globally.

We found that disabling the scalarizer pass helps with
generating v_pk_* instructions, therefore this option should
help with experiments which lead to better understanding
of the impact of running the scalarizer pass in such cases.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D130976

Files:
  llvm/lib/Transforms/Scalar/Scalarizer.cpp


Index: llvm/lib/Transforms/Scalar/Scalarizer.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/Scalarizer.cpp
+++ llvm/lib/Transforms/Scalar/Scalarizer.cpp
@@ -50,6 +50,10 @@
 
 #define DEBUG_TYPE "scalarizer"
 
+static cl::opt<bool>
+    DisableScalarizer("disable-scalarizer", cl::init(false), cl::Hidden,
+                      cl::desc("Don't execute the scalarizer pass"));
+
 static cl::opt<bool> ClScalarizeVariableInsertExtract(
     "scalarize-variable-insert-extract", cl::init(true), cl::Hidden,
     cl::desc("Allow the scalarizer pass to scalarize "
@@ -1011,6 +1015,9 @@
 }
 
 PreservedAnalyses ScalarizerPass::run(Function &F, FunctionAnalysisManager &AM) {
+  if (DisableScalarizer)
+    return PreservedAnalyses::all();
+
   Module &M = *F.getParent();
   unsigned ParallelLoopAccessMDKind =
       M.getContext().getMDKindID("llvm.mem.parallel_loop_access");


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