From 73a3fab480de3804b755d50e427f5d2cda0b6866 Mon Sep 17 00:00:00 2001
From: Chad Rosier <mcrosier@apple.com>
Date: Fri, 6 Jan 2012 23:45:47 +0000
Subject: Add comment.

llvm-svn: 147696
---
 llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'llvm/lib/CodeGen/SelectionDAG')

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 1e7bf667d4e..bfb6dfa0b17 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/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> ");
-- 
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