[llvm-branch-commits] [llvm-branch] r100194 - in /llvm/branches/Apple/Morbo: lib/Transforms/Scalar/IndVarSimplify.cpp test/Transforms/IndVarSimplify/dangling-use.ll

[Dan Gohman]

Author: djg
Date: Fri Apr  2 13:07:22 2010
New Revision: 100194

URL: http://llvm.org/viewvc/llvm-project?rev=100194&view=rev
Log:
$ svn merge -c 100186 https://djg@llvm.org/svn/llvm-project/llvm/trunk
A    test/Transforms/IndVarSimplify/dangling-use.ll
U    lib/Transforms/Scalar/IndVarSimplify.cpp

Added:
    llvm/branches/Apple/Morbo/test/Transforms/IndVarSimplify/dangling-use.ll
      - copied unchanged from r100186, llvm/trunk/test/Transforms/IndVarSimplify/dangling-use.ll
Modified:
    llvm/branches/Apple/Morbo/lib/Transforms/Scalar/IndVarSimplify.cpp

Modified: llvm/branches/Apple/Morbo/lib/Transforms/Scalar/IndVarSimplify.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/branches/Apple/Morbo/lib/Transforms/Scalar/IndVarSimplify.cpp?rev=100194&r1=100193&r2=100194&view=diff
==============================================================================
--- llvm/branches/Apple/Morbo/lib/Transforms/Scalar/IndVarSimplify.cpp (original)
+++ llvm/branches/Apple/Morbo/lib/Transforms/Scalar/IndVarSimplify.cpp Fri Apr  2 13:07:22 2010
@@ -506,6 +506,13 @@
     // Now expand it into actual Instructions and patch it into place.
     Value *NewVal = Rewriter.expandCodeFor(AR, UseTy, InsertPt);
 
+    // Inform ScalarEvolution that this value is changing. The change doesn't
+    // affect its value, but it does potentially affect which use lists the
+    // value will be on after the replacement, which affects ScalarEvolution's
+    // ability to walk use lists and drop dangling pointers when a value is
+    // deleted.
+    SE->forgetValue(User);
+
     // Patch the new value into place.
     if (Op->hasName())
       NewVal->takeName(Op);