[llvm-commits] [llvm] r56019 - /llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp

[Evan Cheng]

Author: evancheng
Date: Tue Sep  9 16:44:23 2008
New Revision: 56019

URL: http://llvm.org/viewvc/llvm-project?rev=56019&view=rev
Log:
Clear preference when it no longer makes sense.

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=56019&r1=56018&r2=56019&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp (original)
+++ llvm/trunk/lib/CodeGen/SimpleRegisterCoalescing.cpp Tue Sep  9 16:44:23 2008
@@ -1317,6 +1317,14 @@
     }
   }
 
+  // If resulting interval has a preference that no longer fits because of subreg
+  // coalescing, just clear the preference.
+  if (ResDstInt->preference && (isExtSubReg || isInsSubReg)) {
+    const TargetRegisterClass *RC = mri_->getRegClass(ResDstInt->reg);
+    if (!RC->contains(ResDstInt->preference))
+      ResDstInt->preference = 0;
+  }
+
   DOUT << "\n\t\tJoined.  Result = "; ResDstInt->print(DOUT, tri_);
   DOUT << "\n";