[llvm-commits] [llvm] r47569 - /llvm/trunk/lib/Target/X86/X86ISelDAGToDAG.cpp

[Dan Gohman]

Author: djg
Date: Mon Feb 25 16:15:55 2008
New Revision: 47569

URL: http://llvm.org/viewvc/llvm-project?rev=47569&view=rev
Log:
Add an assert to verify that we don't see an
{S,U}MUL_LOHI with an unused high value.

Modified:
    llvm/trunk/lib/Target/X86/X86ISelDAGToDAG.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelDAGToDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelDAGToDAG.cpp?rev=47569&r1=47568&r2=47569&view=diff

==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelDAGToDAG.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelDAGToDAG.cpp Mon Feb 25 16:15:55 2008
@@ -1221,6 +1221,9 @@
 
     case ISD::SMUL_LOHI:
     case ISD::UMUL_LOHI: {
+      assert(!N.getValue(1).use_empty() &&
+             "A MUL_LOHI with an unused high result should fold to a MUL!");
+
       SDOperand N0 = Node->getOperand(0);
       SDOperand N1 = Node->getOperand(1);