[llvm-commits] [llvm] r98007 - /llvm/trunk/lib/CodeGen/MachineCSE.cpp

[Evan Cheng]

Author: evancheng
Date: Mon Mar  8 17:28:08 2010
New Revision: 98007

URL: http://llvm.org/viewvc/llvm-project?rev=98007&view=rev
Log:
Restrict machine cse to really trivial coalescing. Leave the heavy lifting to a real coalescer.

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

Modified: llvm/trunk/lib/CodeGen/MachineCSE.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineCSE.cpp?rev=98007&r1=98006&r2=98007&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineCSE.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineCSE.cpp Mon Mar  8 17:28:08 2010
@@ -91,7 +91,10 @@
     unsigned SrcReg, DstReg, SrcSubIdx, DstSubIdx;
     if (TII->isMoveInstr(*DefMI, SrcReg, DstReg, SrcSubIdx, DstSubIdx) &&
         TargetRegisterInfo::isVirtualRegister(SrcReg) &&
+        MRI->getRegClass(SrcReg) == MRI->getRegClass(Reg) &&
         !SrcSubIdx && !DstSubIdx) {
+      DEBUG(dbgs() << "Coalescing: " << *DefMI);
+      DEBUG(dbgs() << "*** to: " << *MI);
       MO.setReg(SrcReg);
       DefMI->eraseFromParent();
       ++NumCoalesces;