From: Alkis Evlogimenos <alkis@evlogimenos.com>
Date: Wed, 1 Sep 2004 22:34:52 +0000 (+0000)
Subject: Give a better assertion if we see a use before a def.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2e58a410896ffbee3d856b113c3718bc4a5462e8;p=oota-llvm.git

Give a better assertion if we see a use before a def.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16135 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp
index f6d00f702ac..630477d7b65 100644
--- a/lib/CodeGen/LiveVariables.cpp
+++ b/lib/CodeGen/LiveVariables.cpp
@@ -82,6 +82,8 @@ void LiveVariables::MarkVirtRegAliveInBlock(VarInfo &VRInfo,
 
 void LiveVariables::HandleVirtRegUse(VarInfo &VRInfo, MachineBasicBlock *MBB,
                                      MachineInstr *MI) {
+  assert(VRInfo.DefInst && "Register use before def!");
+
   // Check to see if this basic block is already a kill block...
   if (!VRInfo.Kills.empty() && VRInfo.Kills.back()->getParent() == MBB) {
     // Yes, this register is killed in this basic block already.  Increase the