[llvm-commits] [llvm] r122617 - /llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp

[Cameron Zwarich]

Author: zwarich
Date: Tue Dec 28 21:52:51 2010
New Revision: 122617

URL: http://llvm.org/viewvc/llvm-project?rev=122617&view=rev
Log:
Add text explaining an assertion.

Modified:
    llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp

Modified: llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp?rev=122617&r1=122616&r2=122617&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp (original)
+++ llvm/trunk/lib/CodeGen/StrongPHIElimination.cpp Tue Dec 28 21:52:51 2010
@@ -283,7 +283,9 @@
     LiveInterval& DestLI = LI->getInterval(DestReg);
     LiveInterval& NewLI = LI->getInterval(NewReg);
 
-    assert(DestLI.ranges.size() == 1);
+    assert(DestLI.ranges.size() == 1
+           && "PHI destination copy's live interval should be a single live "
+               "range from the beginning of the BB to the copy instruction.");
     LiveRange* DestLR = DestLI.begin();
     VNInfo* NewVNI = NewLI.getVNInfoAt(DestLR->start);
     if (!NewVNI) {