[llvm-commits] [llvm] r105914 - /llvm/trunk/lib/Transforms/Scalar/SimplifyCFGPass.cpp

[Benjamin Kramer]

Author: d0k
Date: Sun Jun 13 09:35:54 2010
New Revision: 105914

URL: http://llvm.org/viewvc/llvm-project?rev=105914&view=rev
Log:
SimplifyCFG: don't turn volatile stores to null/undef into unreachable. Fixes PR7369.

Modified:
    llvm/trunk/lib/Transforms/Scalar/SimplifyCFGPass.cpp

Modified: llvm/trunk/lib/Transforms/Scalar/SimplifyCFGPass.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Scalar/SimplifyCFGPass.cpp?rev=105914&r1=105913&r2=105914&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Scalar/SimplifyCFGPass.cpp (original)
+++ llvm/trunk/lib/Transforms/Scalar/SimplifyCFGPass.cpp Sun Jun 13 09:35:54 2010
@@ -137,6 +137,9 @@
       // they should be changed to unreachable by passes that can't modify the
       // CFG.
       if (StoreInst *SI = dyn_cast<StoreInst>(BBI)) {
+        // Don't touch volatile stores.
+        if (SI->isVolatile()) continue;
+
         Value *Ptr = SI->getOperand(1);
         
         if (isa<UndefValue>(Ptr) ||