[PATCH] D111596: [SelectionDAG] Bail out of mergeTruncStores when not optimizing

[Arthur Eubanks via Phabricator via llvm-commits]

aeubanks created this revision.
Herald added subscribers: ecnelises, hiraditya.
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With unoptimized code, we may see lots of stores and spend too much time in mergeTruncStores.

Fixes PR51827.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D111596

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp


Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -7315,7 +7315,7 @@
   // TODO: If there is evidence that running this later would help, this
   //       limitation could be removed. Legality checks may need to be added
   //       for the created store and optional bswap/rotate.
-  if (LegalOperations)
+  if (LegalOperations || OptLevel == CodeGenOpt::None)
     return SDValue();
 
   // We only handle merging simple stores of 1-4 bytes.


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