[llvm-commits] [llvm] r55074 - /llvm/trunk/lib/CodeGen/MachineLICM.cpp

[Bill Wendling]

Author: void
Date: Wed Aug 20 15:32:05 2008
New Revision: 55074

URL: http://llvm.org/viewvc/llvm-project?rev=55074&view=rev
Log:
Don't hoist instructions that define a physical register.

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

Modified: llvm/trunk/lib/CodeGen/MachineLICM.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineLICM.cpp?rev=55074&r1=55073&r2=55074&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/MachineLICM.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineLICM.cpp Wed Aug 20 15:32:05 2008
@@ -273,7 +273,14 @@
   for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i) {
     const MachineOperand &MO = I.getOperand(i);
 
-    if (!MO.isRegister() || !MO.isUse())
+    if (!MO.isRegister())
+      continue;
+
+    if (MO.isDef() && TargetRegisterInfo::isPhysicalRegister(MO.getReg()))
+      // Don't hoist an instruction that defines a physical register.
+      return false;
+
+    if (!MO.isUse())
       continue;
 
     unsigned Reg = MO.getReg();