[llvm] r175130 - RegisterCoalescer::reMaterializeTrivialDef() can constrain the destination

[Cameron Zwarich]

Author: zwarich
Date: Wed Feb 13 21:25:24 2013
New Revision: 175130

URL: http://llvm.org/viewvc/llvm-project?rev=175130&view=rev
Log:
RegisterCoalescer::reMaterializeTrivialDef() can constrain the destination
register class to match the defining instruction.

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

Modified: llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp?rev=175130&r1=175129&r2=175130&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp Wed Feb 13 21:25:24 2013
@@ -769,7 +769,7 @@ bool RegisterCoalescer::reMaterializeTri
     // extract_subreg, insert_subreg, subreg_to_reg coalescing.
     const TargetRegisterClass *RC = TII->getRegClass(MCID, 0, TRI, *MF);
     if (TargetRegisterInfo::isVirtualRegister(DstReg)) {
-      if (MRI->getRegClass(DstReg) != RC)
+      if (!MRI->constrainRegClass(DstReg, RC))
         return false;
     } else if (!RC->contains(DstReg))
       return false;