From: Chris Lattner <sabre@nondot.org>
Date: Sun, 29 Feb 2004 22:01:51 +0000 (+0000)
Subject: Add an assert
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=92bc3bc11c2d439264b1cf9e7fc5bc79f4215a54;p=oota-llvm.git

Add an assert


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12010 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp
index 35c64e25484..10c215885f7 100644
--- a/lib/CodeGen/LiveVariables.cpp
+++ b/lib/CodeGen/LiveVariables.cpp
@@ -277,7 +277,9 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
       // PHI nodes are guaranteed to be at the top of the block...
       for (MachineBasicBlock::iterator MI = Succ->begin(), ME = Succ->end();
 	   MI != ME && MI->getOpcode() == TargetInstrInfo::PHI; ++MI) {
-	for (unsigned i = 1; ; i += 2)
+	for (unsigned i = 1; ; i += 2) {
+          assert(MI->getNumOperands() > i+1 &&
+                 "Didn't find an entry for our predecessor??");
 	  if (MI->getOperand(i+1).getMachineBasicBlock() == MBB) {
 	    MachineOperand &MO = MI->getOperand(i);
 	    if (!MO.getVRegValueOrNull()) {
@@ -288,6 +290,7 @@ bool LiveVariables::runOnMachineFunction(MachineFunction &MF) {
 	      break;   // Found the PHI entry for this block...
 	    }
 	  }
+        }
       }
     }