[PATCH] D28460: getLoopEstimatedTripCount should really be called getLoopEstimatedBackedgeTakeCount.

[Xin Tong via Phabricator via llvm-commits]

trentxintong updated this revision to Diff 84220.
trentxintong added a comment.

Address suggestions by @mkuper


https://reviews.llvm.org/D28460

Files:
  lib/Transforms/Utils/LoopUtils.cpp


Index: lib/Transforms/Utils/LoopUtils.cpp
===================================================================
--- lib/Transforms/Utils/LoopUtils.cpp
+++ lib/Transforms/Utils/LoopUtils.cpp
@@ -1094,9 +1094,9 @@
     return 0;
 
   // Divide the count of the backedge by the count of the edge exiting the loop,
-  // rounding to nearest.
+  // rounding to nearest. Trip count == backedge-taken count + 1.
   if (LatchBR->getSuccessor(0) == L->getHeader())
-    return (TrueVal + (FalseVal / 2)) / FalseVal;
+    return (TrueVal + (FalseVal / 2)) / FalseVal + 1;
   else
-    return (FalseVal + (TrueVal / 2)) / TrueVal;
+    return (FalseVal + (TrueVal / 2)) / TrueVal + 1;
 }


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