[PATCH] D107448: {DebugInfo][LoopStrengthReduction] Don't cache dbg.value that are already undef

[Chris Jackson via Phabricator via llvm-commits]

chrisjackson created this revision.
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The SCEV-based salvaging method caches dbg.value information pre-LSR so that salvaging may be attempted on those dbg.value if necessary post-LSR. If the dbg.value are already undef pre-LSR then a salvage attempt would be fruitless, so avoid caching them.


https://reviews.llvm.org/D107448

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


Index: llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -6217,6 +6217,9 @@
       if (!DVI)
         continue;
 
+      if(DVI->isUndef())
+        continue;
+
       if (DVI->hasArgList())
         continue;
 


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