[llvm-commits] [llvm] r150404 - /llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp

[Jakob Stoklund Olesen]

Author: stoklund
Date: Mon Feb 13 12:17:04 2012
New Revision: 150404

URL: http://llvm.org/viewvc/llvm-project?rev=150404&view=rev
Log:
Check regmask interference for -join-physregs.

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=150404&r1=150403&r2=150404&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegisterCoalescer.cpp Mon Feb 13 12:17:04 2012
@@ -1426,6 +1426,14 @@
       return true;
     }
 
+    // Check if a register mask clobbers DstReg.
+    BitVector UsableRegs;
+    if (LIS->checkRegMaskInterference(RHS, UsableRegs) &&
+        !UsableRegs.test(CP.getDstReg())) {
+      DEBUG(dbgs() << "\t\tRegister mask interference.\n");
+      return false;
+    }
+
     for (const unsigned *AS = TRI->getAliasSet(CP.getDstReg()); *AS; ++AS){
       if (!LIS->hasInterval(*AS))
         continue;