[llvm-commits] [llvm] r139702 - /llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Wed Sep 14 12:34:37 2011
New Revision: 139702

URL: http://llvm.org/viewvc/llvm-project?rev=139702&view=rev
Log:
Ignore the cloning of unknown registers.

THe LRE_DidCloneVirtReg callback may be called with vitual registers
that RAGreedy doesn't even know about yet.  In that case, there are no
data structures to update.

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

Modified: llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp?rev=139702&r1=139701&r2=139702&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegAllocGreedy.cpp Wed Sep 14 12:34:37 2011
@@ -377,6 +377,10 @@
 }
 
 void RAGreedy::LRE_DidCloneVirtReg(unsigned New, unsigned Old) {
+  // Cloning a register we haven't even heard about yet?  Just ignore it.
+  if (!ExtraRegInfo.inBounds(Old))
+    return;
+
   // LRE may clone a virtual register because dead code elimination causes it to
   // be split into connected components. The new components are much smaller
   // than the original, so they should get a new chance at being assigned.