[llvm] r184620 - Prevent LiveRangeEdit from deleting bundled instructions.

[Andrew Trick]

Author: atrick
Date: Fri Jun 21 19:33:48 2013
New Revision: 184620

URL: http://llvm.org/viewvc/llvm-project?rev=184620&view=rev
Log:
Prevent LiveRangeEdit from deleting bundled instructions.

We have no targets on trunk that bundle before regalloc. However, we
have been advertising regalloc as bundle safe for use with out-of-tree
targets. We need to at least contain the parts of the code that are
still unsafe.

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

Modified: llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp?rev=184620&r1=184619&r2=184620&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveRangeEdit.cpp Fri Jun 21 19:33:48 2013
@@ -220,6 +220,10 @@ void LiveRangeEdit::eliminateDeadDef(Mac
   assert(MI->allDefsAreDead() && "Def isn't really dead");
   SlotIndex Idx = LIS.getInstructionIndex(MI).getRegSlot();
 
+  // Never delete a bundled instruction.
+  if (MI->isBundled()) {
+    return;
+  }
   // Never delete inline asm.
   if (MI->isInlineAsm()) {
     DEBUG(dbgs() << "Won't delete: " << Idx << '\t' << *MI);