From 07a0700418ced82f58426155fbc59cc69877775a Mon Sep 17 00:00:00 2001
From: Bill Wendling <isanbard@gmail.com>
Date: Fri, 9 Jul 2010 19:44:12 +0000
Subject: [PATCH] Clarify what mysterious check means.

llvm-svn: 108005
---
 lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 5eb1a003bc6..43ef9a1cacf 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -300,6 +300,9 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
       for (MachineBasicBlock::const_iterator
              II = MBB->begin(), IE = MBB->end(); II != IE; ++II) {
         const TargetInstrDesc &TID = TM.getInstrInfo()->get(II->getOpcode());
+
+        // Operand 1 of an inline asm instruction indicates whether the asm
+        // needs stack or not.
         if ((II->isInlineAsm() && II->getOperand(1).getImm()) ||
             (TID.isCall() && !TID.isReturn())) {
           MFI->setHasCalls(true);