From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Wed, 14 Sep 2011 17:34:37 +0000 (+0000)
Subject: Ignore the cloning of unknown registers.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0d4fea786670473b53d285be378e619399e03488;p=oota-llvm.git

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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139702 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp
index 08767a0d052..f54a2c85d10 100644
--- a/lib/CodeGen/RegAllocGreedy.cpp
+++ b/lib/CodeGen/RegAllocGreedy.cpp
@@ -377,6 +377,10 @@ void RAGreedy::LRE_WillShrinkVirtReg(unsigned VirtReg) {
 }
 
 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.