commit 9b0c4f8af3e303c85ddb5ff0ee2c8e27a4d77203
author Jakob Stoklund Olesen <stoklund@2pi.dk> Wed Dec 08 23:51:35 2010 +0000
committer Jakob Stoklund Olesen <stoklund@2pi.dk> Wed Dec 08 23:51:35 2010 +0000
tree 74ecb9a8267c209adc0fc0f34fa2d1db07f89ac4
parent 045869c12ac5af2b1dd97a0dcbedab8db01fe765

Properly deal with empty intervals when checking for interference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121319 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/RegAllocGreedy.cpp

diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index c88d474..f69979b 100644
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -173,6 +173,7 @@
       // Found an available register.
       return PhysReg;
     }
+    assert(!VirtReg.empty() && "Empty VirtReg has interference");
     LiveInterval *interferingVirtReg =
       Queries[interfReg].firstInterference().liveUnionPos().value();