[llvm-commits] [llvm] r148043 - /llvm/trunk/lib/CodeGen/BranchFolding.cpp

[Evan Cheng]

Author: evancheng
Date: Thu Jan 12 14:31:24 2012
New Revision: 148043

URL: http://llvm.org/viewvc/llvm-project?rev=148043&view=rev
Log:
When hoisting common code, watch out for uses which are marked "kill". If the
killed registers are needed below the insertion point, then unset the kill
marker.

Sorry I'm not able to find a reduced test case.

rdar://10660944

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

Modified: llvm/trunk/lib/CodeGen/BranchFolding.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/BranchFolding.cpp?rev=148043&r1=148042&r2=148043&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/BranchFolding.cpp (original)
+++ llvm/trunk/lib/CodeGen/BranchFolding.cpp Thu Jan 12 14:31:24 2012
@@ -1618,6 +1618,11 @@
           IsSafe = false;
           break;
         }
+
+        if (MO.isKill() && Uses.count(Reg))
+          // Kills a register that's read by the instruction at the point of
+          // insertion. Remove the kill marker.
+          MO.setIsKill(false);
       }
     }
     if (!IsSafe)