From: Chad Rosier <mcrosier@apple.com>
Date: Fri, 6 Jan 2012 23:45:47 +0000 (+0000)
Subject: Add comment.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=4bf76e0e28c2cc358e1106b64cad2fa59714df53;p=oota-llvm.git

Add comment.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@147696 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 1e7bf667d4e..bfb6dfa0b17 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -903,6 +903,10 @@ static bool isFoldedOrDeadInstruction(const Instruction *I,
 }
 
 #ifndef NDEBUG
+// Collect per Instruction statistics for fast-isel misses.  Only those
+// instructions that cause the bail are accounted for.  It does not account for
+// instructions higher in the block.  Thus, summing the per instructions stats
+// will not add up to what is reported by NumFastIselFailures.
 static void collectFailStats(const Instruction *I) {
   switch (I->getOpcode()) {
   default: assert (0 && "<Invalid operator> ");