[llvm] 0754686 - [LoopVec] Add a minor clarifying comment

[Philip Reames via llvm-commits]

Author: Philip Reames
Date: 2020-11-24T10:45:06-08:00
New Revision: 075468621c0f4569f4c91d4f3097b3a60812cfcc

URL: https://github.com/llvm/llvm-project/commit/075468621c0f4569f4c91d4f3097b3a60812cfcc
DIFF: https://github.com/llvm/llvm-project/commit/075468621c0f4569f4c91d4f3097b3a60812cfcc.diff

LOG: [LoopVec] Add a minor clarifying comment

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 3253678e6532..af314ae4b27b 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -5119,7 +5119,8 @@ void LoopVectorizationCostModel::collectLoopUniforms(ElementCount VF) {
         addToWorklistIfAllowed(&I);
 
       // True if all users of Ptr are memory accesses that have Ptr as their
-      // pointer operand.
+      // pointer operand.  Since loops are assumed to be in LCSSA form, this
+      // disallows uses outside the loop as well.
       auto UsersAreMemAccesses =
           llvm::all_of(Ptr->users(), [&](User *U) -> bool {
             return getLoadStorePointerOperand(U) == Ptr;