commit b5a3196f809e8edb2e9fef09de1de3d382cb852f
author Chris Lattner <sabre@nondot.org> Wed Dec 01 01:24:55 2010 +0000
committer Chris Lattner <sabre@nondot.org> Wed Dec 01 01:24:55 2010 +0000
tree a21ccee8f5ab344189679d1574d631c74e8efcc4
parent 76f4e1038878e1944bb3e32e8183ce8b973bc61b

fix a bozo bug I introduced in r119930, causing a miscompile of
20040709-1.c from the gcc testsuite.  I was using the size of a
pointer instead of the pointee.  This fixes rdar://8713376


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120519 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/MemCpyOptimizer.cpp

diff --git a/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/lib/Transforms/Scalar/MemCpyOptimizer.cpp
index 087f022..5d867e7 100644
--- a/lib/Transforms/Scalar/MemCpyOptimizer.cpp
+++ b/lib/Transforms/Scalar/MemCpyOptimizer.cpp
@@ -814,7 +814,8 @@
 
   // Find out what feeds this byval argument.
   Value *ByValArg = CS.getArgument(ArgNo);
-  uint64_t ByValSize = TD->getTypeAllocSize(ByValArg->getType());
+  const Type *ByValTy =cast<PointerType>(ByValArg->getType())->getElementType();
+  uint64_t ByValSize = TD->getTypeAllocSize(ByValTy);
   MemDepResult DepInfo =
     MD->getPointerDependencyFrom(AliasAnalysis::Location(ByValArg, ByValSize),
                                  true, CS.getInstruction(),