[llvm] 7aba6a0 - [LV] Fix value that could be read uninitialized.

[Florian Hahn via llvm-commits]

Author: Florian Hahn
Date: 2020-04-06T17:54:50+01:00
New Revision: 7aba6a03331921aa10b023f1a7ec513faf18e3f9

URL: https://github.com/llvm/llvm-project/commit/7aba6a03331921aa10b023f1a7ec513faf18e3f9
DIFF: https://github.com/llvm/llvm-project/commit/7aba6a03331921aa10b023f1a7ec513faf18e3f9.diff

LOG: [LV] Fix value that could be read uninitialized.

This should fix
http://lab.llvm.org:8011/builders/sanitizer-x86_64-linux-bootstrap-msan/builds/18569

Added: 
    

Modified: 
    llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

Removed: 
    


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diff  --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index eecad0c3d3b5..651a201e4ff9 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -6908,7 +6908,7 @@ VPWidenCallRecipe *VPRecipeBuilder::tryToWidenCall(Instruction *I,
     // The flag shows whether we use Intrinsic or a usual Call for vectorized
     // version of the instruction.
     // Is it beneficial to perform intrinsic call compared to lib call?
-    bool NeedToScalarize;
+    bool NeedToScalarize = false;
     unsigned CallCost = CM.getVectorCallCost(CI, VF, NeedToScalarize);
     bool UseVectorIntrinsic =
         ID && CM.getVectorIntrinsicCost(CI, VF) <= CallCost;