[llvm-commits] [llvm] r151574 - /llvm/trunk/lib/CodeGen/MachineCopyPropagation.cpp

[Evan Cheng]

Author: evancheng
Date: Mon Feb 27 15:46:42 2012
New Revision: 151574

URL: http://llvm.org/viewvc/llvm-project?rev=151574&view=rev
Log:
Fix for PR12090: clear def maps of aliases when visiting a copy. e.g.
%S5<def> = COPY %S0<kill>
First clear def map of Q1, etc.

No small test case available.

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

Modified: llvm/trunk/lib/CodeGen/MachineCopyPropagation.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/MachineCopyPropagation.cpp?rev=151574&r1=151573&r2=151574&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/MachineCopyPropagation.cpp (original)
+++ llvm/trunk/lib/CodeGen/MachineCopyPropagation.cpp Mon Feb 27 15:46:42 2012
@@ -199,6 +199,11 @@
       SourceNoLongerAvailable(Def, SrcMap, AvailCopyMap);
 
       // Remember Def is defined by the copy.
+      // ... Make sure to clear the def maps of aliases first.
+      for (const unsigned *AS = TRI->getAliasSet(Def); *AS; ++AS) {
+        CopyMap.erase(*AS);
+        AvailCopyMap.erase(*AS);
+      }
       CopyMap[Def] = MI;
       AvailCopyMap[Def] = MI;
       for (const unsigned *SR = TRI->getSubRegisters(Def); *SR; ++SR) {