[llvm-commits] [llvm] r45253 - /llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp

[Evan Cheng]

Author: evancheng
Date: Wed Dec 19 20:23:25 2007
New Revision: 45253

URL: http://llvm.org/viewvc/llvm-project?rev=45253&view=rev
Log:
The physical register + virtual register joining requirement was much too strict.

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

Modified: llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp?rev=45253&r1=45252&r2=45253&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp (original)
+++ llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp Wed Dec 19 20:23:25 2007
@@ -396,7 +396,7 @@
     unsigned JoinVReg = SrcIsPhys ? repDstReg : repSrcReg;
     unsigned JoinPReg = SrcIsPhys ? repSrcReg : repDstReg;
     const TargetRegisterClass *RC = mf_->getSSARegMap()->getRegClass(JoinVReg);
-    unsigned Threshold = allocatableRCRegs_[RC].count();
+    unsigned Threshold = allocatableRCRegs_[RC].count() * 2;
     if (TheCopy.isBackEdge)
       Threshold *= 2; // Favors back edge copies.