diff --git a/lib/Analysis/ConstantFolding.cpp b/lib/Analysis/ConstantFolding.cpp
index 657ada4..96a5219 100644
--- a/lib/Analysis/ConstantFolding.cpp
+++ b/lib/Analysis/ConstantFolding.cpp
@@ -9,9 +9,9 @@
 //
 // This file defines routines for folding instructions into constants.
 //
-// Also, to supplement the basic VMCore ConstantExpr simplifications,
+// Also, to supplement the basic IR ConstantExpr simplifications,
 // this file defines some additional folding routines that can make use of
-// DataLayout information. These functions cannot go in VMCore due to library
+// DataLayout information. These functions cannot go in IR due to library
 // dependency issues.
 //
 //===----------------------------------------------------------------------===//
@@ -68,7 +68,7 @@
       unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits();
       Type *SrcIVTy =
         VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElts);
-      // Ask VMCore to do the conversion now that #elts line up.
+      // Ask IR to do the conversion now that #elts line up.
       C = ConstantExpr::getBitCast(C, SrcIVTy);
       CDV = cast<ConstantDataVector>(C);
     }
@@ -104,7 +104,7 @@
   if (!isa<ConstantDataVector>(C) && !isa<ConstantVector>(C))
     return ConstantExpr::getBitCast(C, DestTy);
 
-  // If the element types match, VMCore can fold it.
+  // If the element types match, IR can fold it.
   unsigned NumDstElt = DestVTy->getNumElements();
   unsigned NumSrcElt = C->getType()->getVectorNumElements();
   if (NumDstElt == NumSrcElt)
@@ -131,7 +131,7 @@
     // Recursively handle this integer conversion, if possible.
     C = FoldBitCast(C, DestIVTy, TD);
 
-    // Finally, VMCore can handle this now that #elts line up.
+    // Finally, IR can handle this now that #elts line up.
     return ConstantExpr::getBitCast(C, DestTy);
   }
 
@@ -141,9 +141,9 @@
     unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits();
     Type *SrcIVTy =
       VectorType::get(IntegerType::get(C->getContext(), FPWidth), NumSrcElt);
-    // Ask VMCore to do the conversion now that #elts line up.
+    // Ask IR to do the conversion now that #elts line up.
     C = ConstantExpr::getBitCast(C, SrcIVTy);
-    // If VMCore wasn't able to fold it, bail out.
+    // If IR wasn't able to fold it, bail out.
     if (!isa<ConstantVector>(C) &&  // FIXME: Remove ConstantVector.
         !isa<ConstantDataVector>(C))
       return C;
diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index c65d496..d1ea027 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -1,6 +1,6 @@
 # `Support' and `TableGen' libraries are added on the top-level CMakeLists.txt
 
-add_subdirectory(VMCore)
+add_subdirectory(IR)
 add_subdirectory(CodeGen)
 add_subdirectory(Bitcode)
 add_subdirectory(Transforms)
diff --git a/lib/VMCore/AsmWriter.cpp b/lib/IR/AsmWriter.cpp
similarity index 100%
rename from lib/VMCore/AsmWriter.cpp
rename to lib/IR/AsmWriter.cpp
diff --git a/lib/VMCore/AttributeImpl.h b/lib/IR/AttributeImpl.h
similarity index 100%
rename from lib/VMCore/AttributeImpl.h
rename to lib/IR/AttributeImpl.h
diff --git a/lib/VMCore/Attributes.cpp b/lib/IR/Attributes.cpp
similarity index 100%
rename from lib/VMCore/Attributes.cpp
rename to lib/IR/Attributes.cpp
diff --git a/lib/VMCore/AutoUpgrade.cpp b/lib/IR/AutoUpgrade.cpp
similarity index 100%
rename from lib/VMCore/AutoUpgrade.cpp
rename to lib/IR/AutoUpgrade.cpp
diff --git a/lib/VMCore/BasicBlock.cpp b/lib/IR/BasicBlock.cpp
similarity index 99%
rename from lib/VMCore/BasicBlock.cpp
rename to lib/IR/BasicBlock.cpp
index f23a496..db20b08 100644
--- a/lib/VMCore/BasicBlock.cpp
+++ b/lib/IR/BasicBlock.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the BasicBlock class for the VMCore library.
+// This file implements the BasicBlock class for the IR library.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/VMCore/CMakeLists.txt b/lib/IR/CMakeLists.txt
similarity index 100%
rename from lib/VMCore/CMakeLists.txt
rename to lib/IR/CMakeLists.txt
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/IR/ConstantFold.cpp
similarity index 99%
rename from lib/VMCore/ConstantFold.cpp
rename to lib/IR/ConstantFold.cpp
index dedae5a..91dc83f 100644
--- a/lib/VMCore/ConstantFold.cpp
+++ b/lib/IR/ConstantFold.cpp
@@ -13,7 +13,7 @@
 //
 // The current constant folding implementation is implemented in two pieces: the
 // pieces that don't need DataLayout, and the pieces that do. This is to avoid
-// a dependence in VMCore on Target.
+// a dependence in IR on Target.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/VMCore/ConstantFold.h b/lib/IR/ConstantFold.h
similarity index 100%
rename from lib/VMCore/ConstantFold.h
rename to lib/IR/ConstantFold.h
diff --git a/lib/VMCore/Constants.cpp b/lib/IR/Constants.cpp
similarity index 99%
rename from lib/VMCore/Constants.cpp
rename to lib/IR/Constants.cpp
index 008378a..a97b620 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/IR/Constants.cpp
@@ -301,7 +301,7 @@
 ///     linker will never see them.
 ///  GlobalRelocations: This entry may have arbitrary relocations.
 ///
-/// FIXME: This really should not be in VMCore.
+/// FIXME: This really should not be in IR.
 Constant::PossibleRelocationsTy Constant::getRelocationInfo() const {
   if (const GlobalValue *GV = dyn_cast<GlobalValue>(this)) {
     if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
diff --git a/lib/VMCore/ConstantsContext.h b/lib/IR/ConstantsContext.h
similarity index 100%
rename from lib/VMCore/ConstantsContext.h
rename to lib/IR/ConstantsContext.h
diff --git a/lib/VMCore/Core.cpp b/lib/IR/Core.cpp
similarity index 100%
rename from lib/VMCore/Core.cpp
rename to lib/IR/Core.cpp
diff --git a/lib/VMCore/DIBuilder.cpp b/lib/IR/DIBuilder.cpp
similarity index 100%
rename from lib/VMCore/DIBuilder.cpp
rename to lib/IR/DIBuilder.cpp
diff --git a/lib/VMCore/DataLayout.cpp b/lib/IR/DataLayout.cpp
similarity index 100%
rename from lib/VMCore/DataLayout.cpp
rename to lib/IR/DataLayout.cpp
diff --git a/lib/VMCore/DebugInfo.cpp b/lib/IR/DebugInfo.cpp
similarity index 100%
rename from lib/VMCore/DebugInfo.cpp
rename to lib/IR/DebugInfo.cpp
diff --git a/lib/VMCore/DebugLoc.cpp b/lib/IR/DebugLoc.cpp
similarity index 100%
rename from lib/VMCore/DebugLoc.cpp
rename to lib/IR/DebugLoc.cpp
diff --git a/lib/VMCore/Dominators.cpp b/lib/IR/Dominators.cpp
similarity index 100%
rename from lib/VMCore/Dominators.cpp
rename to lib/IR/Dominators.cpp
diff --git a/lib/VMCore/Function.cpp b/lib/IR/Function.cpp
similarity index 99%
rename from lib/VMCore/Function.cpp
rename to lib/IR/Function.cpp
index 3cae4d4..5145129 100644
--- a/lib/VMCore/Function.cpp
+++ b/lib/IR/Function.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the Function class for the VMCore library.
+// This file implements the Function class for the IR library.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/VMCore/GCOV.cpp b/lib/IR/GCOV.cpp
similarity index 100%
rename from lib/VMCore/GCOV.cpp
rename to lib/IR/GCOV.cpp
diff --git a/lib/VMCore/GVMaterializer.cpp b/lib/IR/GVMaterializer.cpp
similarity index 100%
rename from lib/VMCore/GVMaterializer.cpp
rename to lib/IR/GVMaterializer.cpp
diff --git a/lib/VMCore/Globals.cpp b/lib/IR/Globals.cpp
similarity index 99%
rename from lib/VMCore/Globals.cpp
rename to lib/IR/Globals.cpp
index 3fa4406..f21cdcc 100644
--- a/lib/VMCore/Globals.cpp
+++ b/lib/IR/Globals.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the GlobalValue & GlobalVariable classes for the VMCore
+// This file implements the GlobalValue & GlobalVariable classes for the IR
 // library.
 //
 //===----------------------------------------------------------------------===//
diff --git a/lib/VMCore/IRBuilder.cpp b/lib/IR/IRBuilder.cpp
similarity index 100%
rename from lib/VMCore/IRBuilder.cpp
rename to lib/IR/IRBuilder.cpp
diff --git a/lib/VMCore/InlineAsm.cpp b/lib/IR/InlineAsm.cpp
similarity index 100%
rename from lib/VMCore/InlineAsm.cpp
rename to lib/IR/InlineAsm.cpp
diff --git a/lib/VMCore/Instruction.cpp b/lib/IR/Instruction.cpp
similarity index 99%
rename from lib/VMCore/Instruction.cpp
rename to lib/IR/Instruction.cpp
index 81ee4ce..4be432f 100644
--- a/lib/VMCore/Instruction.cpp
+++ b/lib/IR/Instruction.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the Instruction class for the VMCore library.
+// This file implements the Instruction class for the IR library.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/VMCore/Instructions.cpp b/lib/IR/Instructions.cpp
similarity index 100%
rename from lib/VMCore/Instructions.cpp
rename to lib/IR/Instructions.cpp
diff --git a/lib/VMCore/IntrinsicInst.cpp b/lib/IR/IntrinsicInst.cpp
similarity index 100%
rename from lib/VMCore/IntrinsicInst.cpp
rename to lib/IR/IntrinsicInst.cpp
diff --git a/lib/VMCore/LLVMBuild.txt b/lib/IR/LLVMBuild.txt
similarity index 90%
rename from lib/VMCore/LLVMBuild.txt
rename to lib/IR/LLVMBuild.txt
index bca8b2c..cd90ef5 100644
--- a/lib/VMCore/LLVMBuild.txt
+++ b/lib/IR/LLVMBuild.txt
@@ -1,4 +1,4 @@
-;===- ./lib/VMCore/LLVMBuild.txt -------------------------------*- Conf -*--===;
+;===- ./lib/IR/LLVMBuild.txt -----------------------------------*- Conf -*--===;
 ;
 ;                     The LLVM Compiler Infrastructure
 ;
diff --git a/lib/VMCore/LLVMContext.cpp b/lib/IR/LLVMContext.cpp
similarity index 100%
rename from lib/VMCore/LLVMContext.cpp
rename to lib/IR/LLVMContext.cpp
diff --git a/lib/VMCore/LLVMContextImpl.cpp b/lib/IR/LLVMContextImpl.cpp
similarity index 100%
rename from lib/VMCore/LLVMContextImpl.cpp
rename to lib/IR/LLVMContextImpl.cpp
diff --git a/lib/VMCore/LLVMContextImpl.h b/lib/IR/LLVMContextImpl.h
similarity index 100%
rename from lib/VMCore/LLVMContextImpl.h
rename to lib/IR/LLVMContextImpl.h
diff --git a/lib/VMCore/LeakDetector.cpp b/lib/IR/LeakDetector.cpp
similarity index 100%
rename from lib/VMCore/LeakDetector.cpp
rename to lib/IR/LeakDetector.cpp
diff --git a/lib/VMCore/LeaksContext.h b/lib/IR/LeaksContext.h
similarity index 100%
rename from lib/VMCore/LeaksContext.h
rename to lib/IR/LeaksContext.h
diff --git a/lib/VMCore/Makefile b/lib/IR/Makefile
similarity index 94%
rename from lib/VMCore/Makefile
rename to lib/IR/Makefile
index 8b98651..7b8ef42 100644
--- a/lib/VMCore/Makefile
+++ b/lib/IR/Makefile
@@ -1,4 +1,4 @@
-##===- lib/VMCore/Makefile ---------------------------------*- Makefile -*-===##
+##===- lib/IR/Makefile -------------------------------------*- Makefile -*-===##
 #
 #                     The LLVM Compiler Infrastructure
 #
diff --git a/lib/VMCore/Metadata.cpp b/lib/IR/Metadata.cpp
similarity index 100%
rename from lib/VMCore/Metadata.cpp
rename to lib/IR/Metadata.cpp
diff --git a/lib/VMCore/Module.cpp b/lib/IR/Module.cpp
similarity index 99%
rename from lib/VMCore/Module.cpp
rename to lib/IR/Module.cpp
index 78f4eb8..ee4dc62 100644
--- a/lib/VMCore/Module.cpp
+++ b/lib/IR/Module.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the Module class for the VMCore library.
+// This file implements the Module class for the IR library.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/VMCore/Pass.cpp b/lib/IR/Pass.cpp
similarity index 100%
rename from lib/VMCore/Pass.cpp
rename to lib/IR/Pass.cpp
diff --git a/lib/VMCore/PassManager.cpp b/lib/IR/PassManager.cpp
similarity index 100%
rename from lib/VMCore/PassManager.cpp
rename to lib/IR/PassManager.cpp
diff --git a/lib/VMCore/PassRegistry.cpp b/lib/IR/PassRegistry.cpp
similarity index 100%
rename from lib/VMCore/PassRegistry.cpp
rename to lib/IR/PassRegistry.cpp
diff --git a/lib/VMCore/PrintModulePass.cpp b/lib/IR/PrintModulePass.cpp
similarity index 97%
rename from lib/VMCore/PrintModulePass.cpp
rename to lib/IR/PrintModulePass.cpp
index 34b2918..422aa09 100644
--- a/lib/VMCore/PrintModulePass.cpp
+++ b/lib/IR/PrintModulePass.cpp
@@ -1,4 +1,4 @@
-//===--- VMCore/PrintModulePass.cpp - Module/Function Printer -------------===//
+//===--- IR/PrintModulePass.cpp - Module/Function Printer -----------------===//
 //
 //                     The LLVM Compiler Infrastructure
 //
diff --git a/lib/VMCore/SymbolTableListTraitsImpl.h b/lib/IR/SymbolTableListTraitsImpl.h
similarity index 100%
rename from lib/VMCore/SymbolTableListTraitsImpl.h
rename to lib/IR/SymbolTableListTraitsImpl.h
diff --git a/lib/VMCore/TargetTransformInfo.cpp b/lib/IR/TargetTransformInfo.cpp
similarity index 94%
rename from lib/VMCore/TargetTransformInfo.cpp
rename to lib/IR/TargetTransformInfo.cpp
index e91c29c..209e1db 100644
--- a/lib/VMCore/TargetTransformInfo.cpp
+++ b/lib/IR/TargetTransformInfo.cpp
@@ -1,4 +1,4 @@
-//===- llvm/VMCore/TargetTransformInfo.cpp ----------------------*- C++ -*-===//
+//===- llvm/IR/TargetTransformInfo.cpp --------------------------*- C++ -*-===//
 //
 //                     The LLVM Compiler Infrastructure
 //
diff --git a/lib/VMCore/Type.cpp b/lib/IR/Type.cpp
similarity index 99%
rename from lib/VMCore/Type.cpp
rename to lib/IR/Type.cpp
index 3c30582..f76eb9e 100644
--- a/lib/VMCore/Type.cpp
+++ b/lib/IR/Type.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the Type class for the VMCore library.
+// This file implements the Type class for the IR library.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/VMCore/TypeFinder.cpp b/lib/IR/TypeFinder.cpp
similarity index 98%
rename from lib/VMCore/TypeFinder.cpp
rename to lib/IR/TypeFinder.cpp
index 56db645..5002774 100644
--- a/lib/VMCore/TypeFinder.cpp
+++ b/lib/IR/TypeFinder.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the TypeFinder class for the VMCore library.
+// This file implements the TypeFinder class for the IR library.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/VMCore/Use.cpp b/lib/IR/Use.cpp
similarity index 100%
rename from lib/VMCore/Use.cpp
rename to lib/IR/Use.cpp
diff --git a/lib/VMCore/User.cpp b/lib/IR/User.cpp
similarity index 100%
rename from lib/VMCore/User.cpp
rename to lib/IR/User.cpp
diff --git a/lib/VMCore/Value.cpp b/lib/IR/Value.cpp
similarity index 100%
rename from lib/VMCore/Value.cpp
rename to lib/IR/Value.cpp
diff --git a/lib/VMCore/ValueSymbolTable.cpp b/lib/IR/ValueSymbolTable.cpp
similarity index 97%
rename from lib/VMCore/ValueSymbolTable.cpp
rename to lib/IR/ValueSymbolTable.cpp
index 8707daa..ea203bc 100644
--- a/lib/VMCore/ValueSymbolTable.cpp
+++ b/lib/IR/ValueSymbolTable.cpp
@@ -7,7 +7,7 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// This file implements the ValueSymbolTable class for the VMCore library.
+// This file implements the ValueSymbolTable class for the IR library.
 //
 //===----------------------------------------------------------------------===//
 
diff --git a/lib/VMCore/ValueTypes.cpp b/lib/IR/ValueTypes.cpp
similarity index 100%
rename from lib/VMCore/ValueTypes.cpp
rename to lib/IR/ValueTypes.cpp
diff --git a/lib/VMCore/Verifier.cpp b/lib/IR/Verifier.cpp
similarity index 100%
rename from lib/VMCore/Verifier.cpp
rename to lib/IR/Verifier.cpp
diff --git a/lib/LLVMBuild.txt b/lib/LLVMBuild.txt
index e466d82..a31793c 100644
--- a/lib/LLVMBuild.txt
+++ b/lib/LLVMBuild.txt
@@ -16,7 +16,7 @@
 ;===------------------------------------------------------------------------===;
 
 [common]
-subdirectories = Analysis Archive AsmParser Bitcode CodeGen DebugInfo ExecutionEngine Linker MC Object Option Support TableGen Target Transforms VMCore
+subdirectories = Analysis Archive AsmParser Bitcode CodeGen DebugInfo ExecutionEngine Linker IR MC Object Option Support TableGen Target Transforms
 
 [component_0]
 type = Group
diff --git a/lib/Makefile b/lib/Makefile
index e3b03da..043eda6 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -10,7 +10,7 @@
 
 include $(LEVEL)/Makefile.config
 
-PARALLEL_DIRS := VMCore AsmParser Bitcode Archive Analysis Transforms CodeGen \
+PARALLEL_DIRS := IR AsmParser Bitcode Archive Analysis Transforms CodeGen \
                 Target ExecutionEngine Linker MC Object Option DebugInfo
 
 include $(LEVEL)/Makefile.common
diff --git a/utils/GenLibDeps.pl b/utils/GenLibDeps.pl
index 656250c..7748cab 100755
--- a/utils/GenLibDeps.pl
+++ b/utils/GenLibDeps.pl
@@ -98,7 +98,7 @@
     $libpath =~ s/^BitWriter/Bitcode\/Writer/;
     $libpath =~ s/^CppBackend/Target\/CppBackend/;
     $libpath =~ s/^MSIL/Target\/MSIL/;
-    $libpath =~ s/^Core/VMCore/;
+    $libpath =~ s/^Core/IR/;
     $libpath =~ s/^Instrumentation/Transforms\/Instrumentation/;
     $libpath =~ s/^Interpreter/ExecutionEngine\/Interpreter/;
     $libpath =~ s/^JIT/ExecutionEngine\/JIT/;
diff --git a/utils/llvm-build/llvmbuild/main.py b/utils/llvm-build/llvmbuild/main.py
index 32d5395..87e8819 100644
--- a/utils/llvm-build/llvmbuild/main.py
+++ b/utils/llvm-build/llvmbuild/main.py
@@ -809,7 +809,7 @@
     # Determine the LLVM source path, if not given.
     source_root = opts.source_root
     if source_root:
-        if not os.path.exists(os.path.join(source_root, 'lib', 'VMCore',
+        if not os.path.exists(os.path.join(source_root, 'lib', 'IR',
                                            'Function.cpp')):
             parser.error('invalid LLVM source root: %r' % source_root)
     else:
@@ -817,7 +817,7 @@
         llvm_build_path = os.path.dirname(llvmbuild_path)
         utils_path = os.path.dirname(llvm_build_path)
         source_root = os.path.dirname(utils_path)
-        if not os.path.exists(os.path.join(source_root, 'lib', 'VMCore',
+        if not os.path.exists(os.path.join(source_root, 'lib', 'IR',
                                            'Function.cpp')):
             parser.error('unable to infer LLVM source root, please specify')