diff --git a/bitcode2cpp.py b/bitcode2cpp.py
index 13272b82..fa7d4782 100755
--- a/bitcode2cpp.py
+++ b/bitcode2cpp.py
@@ -4,6 +4,8 @@ import sys
 import string
 import re
 import subprocess
+import platform
+import os
 
 length=0
 
@@ -14,8 +16,12 @@ target = re.sub("\.ll$", "", target)
 target = re.sub("\.c$", "", target)
 target = re.sub("-", "_", target)
 
+llvm_as="llvm-as"
+if platform.system() == 'Windows' or string.find(platform.system(), "CYGWIN_NT") != -1:
+    llvm_as = os.getenv("LLVM_INSTALL_DIR").replace("\\", "/") + "/bin/" + llvm_as
+
 try:
-    as_out=subprocess.Popen([ "llvm-as", "-", "-o", "-"], stdout=subprocess.PIPE)
+    as_out=subprocess.Popen([llvm_as, "-", "-o", "-"], stdout=subprocess.PIPE)
 except IOError:
     print >> sys.stderr, "Couldn't open " + src
     sys.exit(1)
diff --git a/ispc.vcxproj b/ispc.vcxproj
index c02bf7b1..e188b8ab 100755
--- a/ispc.vcxproj
+++ b/ispc.vcxproj
@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
@@ -31,12 +31,14 @@
     <ClCompile Include="opt.cpp" />
     <ClCompile Include="parse.cc" />
     <CustomBuild Include="builtins-c.c">
-      <Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">%LLVM_INSTALL_DIR%\bin\clang -m32 -emit-llvm builtins-c.c -c -o - | %LLVM_INSTALL_DIR%\bin\llvm-dis - | python bitcode2cpp.py builtins-c-32.c &gt; gen-bitcode-c-32.cpp</Command>
+      <Command Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">%LLVM_INSTALL_DIR%\bin\clang -m32 -emit-llvm builtins-c.c -c -o - | %LLVM_INSTALL_DIR%\bin\llvm-dis - | python bitcode2cpp.py builtins-c-32.c &gt; gen-bitcode-c-32.cpp;
+%LLVM_INSTALL_DIR%\bin\clang -m64 -emit-llvm builtins-c.c -c -o - | %LLVM_INSTALL_DIR%\bin\llvm-dis - | python bitcode2cpp.py builtins-c-64.c &gt; gen-bitcode-c-64.cpp</Command>
       <Message Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">clang builtins-c.c</Message>
-      <Command Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">%LLVM_INSTALL_DIR%\bin\clang -m32 -emit-llvm builtins-c.c -c -o - | %LLVM_INSTALL_DIR%\bin\llvm-dis - | python bitcode2cpp.py builtins-c-32.c &gt; gen-bitcode-c-32.cpp</Command>
+      <Command Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">%LLVM_INSTALL_DIR%\bin\clang -m32 -emit-llvm builtins-c.c -c -o - | %LLVM_INSTALL_DIR%\bin\llvm-dis - | python bitcode2cpp.py builtins-c-32.c &gt; gen-bitcode-c-32.cpp;
+%LLVM_INSTALL_DIR%\bin\clang -m64 -emit-llvm builtins-c.c -c -o - | %LLVM_INSTALL_DIR%\bin\llvm-dis - | python bitcode2cpp.py builtins-c-64.c &gt; gen-bitcode-c-64.cpp</Command>
       <Message Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">clang builtins-c.c</Message>
-      <Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">gen-bitcode-c.cpp</Outputs>
-      <Outputs Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">gen-bitcode-c.cpp</Outputs>
+      <Outputs Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">gen-bitcode-c-32.cpp;gen-bitcore-c-64.cpp</Outputs>
+      <Outputs Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">gen-bitcode-c-32.cpp;gen-bitcore-c-64.cpp</Outputs>
     </CustomBuild>
     <ClCompile Include="stmt.cpp" />
     <ClCompile Include="sym.cpp" />
@@ -194,7 +196,7 @@
       <PrecompiledHeader>NotUsing</PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>NOMINMAX;LLVM_2_9</PreprocessorDefinitions>
+      <PreprocessorDefinitions>NOMINMAX;LLVM_3_0</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(LLVM_INSTALL_DIR)\include;.;.\winstuff;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <DisableSpecificWarnings>4146;4800;4996;4355;4624</DisableSpecificWarnings>
     </ClCompile>
@@ -202,7 +204,7 @@
       <SubSystem>Console</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <AdditionalLibraryDirectories>$(LLVM_INSTALL_DIR)\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
-      <AdditionalDependencies>clangFrontend.lib;clangDriver.lib;clangSerialization.lib;clangParse.lib;clangSema.lib;clangAnalysis.lib;clangAST.lib;clangLex.lib;clangBasic.lib;LLVMAnalysis.lib;LLVMArchive.lib;LLVMAsmPrinter.lib;LLVMBitReader.lib;LLVMBitWriter.lib;LLVMCodeGen.lib;LLVMCore.lib;LLVMExecutionEngine.lib;LLVMInstCombine.lib;LLVMInstrumentation.lib;LLVMipa.lib;LLVMipo.lib;LLVMLinker.lib;LLVMMC.lib;LLVMMCParser.lib;LLVMObject.lib;LLVMScalarOpts.lib;LLVMSelectionDAG.lib;LLVMSupport.lib;LLVMTarget.lib;LLVMTransformUtils.lib;LLVMX86ASMPrinter.lib;LLVMX86ASMParser.lib;LLVMX86Utils.lib;LLVMX86CodeGen.lib;LLVMX86Disassembler.lib;LLVMX86Info.lib;shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>clangFrontend.lib;clangDriver.lib;clangSerialization.lib;clangParse.lib;clangSema.lib;clangAnalysis.lib;clangAST.lib;clangLex.lib;clangBasic.lib;LLVMAnalysis.lib;LLVMArchive.lib;LLVMAsmParser.lib;LLVMAsmPrinter.lib;LLVMBitReader.lib;LLVMBitWriter.lib;LLVMCodeGen.lib;LLVMCore.lib;LLVMDebugInfo.lib;LLVMExecutionEngine.lib;LLVMInstCombine.lib;LLVMInstrumentation.lib;LLVMLinker.lib;LLVMMC.lib;LLVMMCDisassembler.lib;LLVMMCParser.lib;LLVMObject.lib;LLVMScalarOpts.lib;LLVMSelectionDAG.lib;LLVMSupport.lib;LLVMTarget.lib;LLVMTransformUtils.lib;LLVMX86ASMPrinter.lib;LLVMX86ASMParser.lib;LLVMX86Utils.lib;LLVMX86CodeGen.lib;LLVMX86Desc.lib;LLVMX86Disassembler.lib;LLVMX86Info.lib;LLVMipa.lib;LLVMipo.lib;shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
@@ -212,7 +214,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>NOMINMAX;LLVM_2_9</PreprocessorDefinitions>
+      <PreprocessorDefinitions>NOMINMAX;LLVM_3_0</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(LLVM_INSTALL_DIR)\include;.;.\winstuff;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <DisableSpecificWarnings>4146;4800;4996;4355;4624</DisableSpecificWarnings>
     </ClCompile>
@@ -222,10 +224,10 @@
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
       <AdditionalLibraryDirectories>$(LLVM_INSTALL_DIR)\lib;%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
-      <AdditionalDependencies>clangFrontend.lib;clangDriver.lib;clangSerialization.lib;clangParse.lib;clangSema.lib;clangAnalysis.lib;clangAST.lib;clangLex.lib;clangBasic.lib;LLVMAnalysis.lib;LLVMArchive.lib;LLVMAsmPrinter.lib;LLVMBitReader.lib;LLVMBitWriter.lib;LLVMCodeGen.lib;LLVMCore.lib;LLVMExecutionEngine.lib;LLVMInstCombine.lib;LLVMInstrumentation.lib;LLVMipa.lib;LLVMipo.lib;LLVMLinker.lib;LLVMMC.lib;LLVMMCParser.lib;LLVMObject.lib;LLVMScalarOpts.lib;LLVMSelectionDAG.lib;LLVMSupport.lib;LLVMTarget.lib;LLVMTransformUtils.lib;LLVMX86ASMPrinter.lib;LLVMX86ASMParser.lib;LLVMX86Utils.lib;LLVMX86CodeGen.lib;LLVMX86Disassembler.lib;LLVMX86Info.lib;shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>clangFrontend.lib;clangDriver.lib;clangSerialization.lib;clangParse.lib;clangSema.lib;clangAnalysis.lib;clangAST.lib;clangLex.lib;clangBasic.lib;LLVMAnalysis.lib;LLVMArchive.lib;LLVMAsmParser.lib;LLVMAsmPrinter.lib;LLVMBitReader.lib;LLVMBitWriter.lib;LLVMCodeGen.lib;LLVMCore.lib;LLVMDebugInfo.lib;LLVMExecutionEngine.lib;LLVMInstCombine.lib;LLVMInstrumentation.lib;LLVMLinker.lib;LLVMMC.lib;LLVMMCDisassembler.lib;LLVMMCParser.lib;LLVMObject.lib;LLVMScalarOpts.lib;LLVMSelectionDAG.lib;LLVMSupport.lib;LLVMTarget.lib;LLVMTransformUtils.lib;LLVMX86ASMPrinter.lib;LLVMX86ASMParser.lib;LLVMX86Utils.lib;LLVMX86CodeGen.lib;LLVMX86Desc.lib;LLVMX86Disassembler.lib;LLVMX86Info.lib;LLVMipa.lib;LLVMipo.lib;shlwapi.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
+</Project>
diff --git a/ispc_test.vcxproj b/ispc_test.vcxproj
index 353e3020..e36275b8 100755
--- a/ispc_test.vcxproj
+++ b/ispc_test.vcxproj
@@ -52,14 +52,14 @@
       </PrecompiledHeader>
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
-      <PreprocessorDefinitions>ISPC_IS_WINDOWS;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>LLVM_3_0;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(LLVM_INSTALL_DIR)/include</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
       <GenerateDebugInformation>true</GenerateDebugInformation>
       <AdditionalLibraryDirectories>$(LLVM_INSTALL_DIR)/lib</AdditionalLibraryDirectories>
-      <AdditionalDependencies>LLVMAnalysis.lib;LLVMArchive.lib;LLVMAsmPrinter.lib;LLVMBitReader.lib;LLVMBitWriter.lib;LLVMCodeGen.lib;LLVMCore.lib;LLVMExecutionEngine.lib;LLVMInstCombine.lib;LLVMInstrumentation.lib;LLVMipa.lib;LLVMipo.lib;LLVMJIT.lib;LLVMLinker.lib;LLVMMC.lib;LLVMMCParser.lib;LLVMObject.lib;LLVMScalarOpts.lib;LLVMSelectionDAG.lib;LLVMSupport.lib;LLVMTarget.lib;LLVMTransformUtils.lib;LLVMX86ASMPrinter.lib;LLVMX86ASMParser.lib;LLVMX86Utils.lib;LLVMX86CodeGen.lib;LLVMX86Disassembler.lib;LLVMX86Info.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>LLVMAnalysis.lib;LLVMArchive.lib;LLVMAsmPrinter.lib;LLVMBitReader.lib;LLVMBitWriter.lib;LLVMCodeGen.lib;LLVMCore.lib;LLVMExecutionEngine.lib;LLVMInstCombine.lib;LLVMInstrumentation.lib;LLVMipa.lib;LLVMipo.lib;LLVMJIT.lib;LLVMLinker.lib;LLVMMC.lib;LLVMMCParser.lib;LLVMObject.lib;LLVMScalarOpts.lib;LLVMSelectionDAG.lib;LLVMSupport.lib;LLVMTarget.lib;LLVMTransformUtils.lib;LLVMX86ASMPrinter.lib;LLVMX86ASMParser.lib;LLVMX86Utils.lib;LLVMX86CodeGen.lib;LLVMX86Disassembler.lib;LLVMX86Desc.lib;LLVMX86Info.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
@@ -70,7 +70,7 @@
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
-      <PreprocessorDefinitions>ISPC_IS_WINDOWS;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>LLVM_3_0;NDEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>$(LLVM_INSTALL_DIR)/include</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
@@ -79,10 +79,10 @@
       <EnableCOMDATFolding>true</EnableCOMDATFolding>
       <OptimizeReferences>true</OptimizeReferences>
       <AdditionalLibraryDirectories>$(LLVM_INSTALL_DIR)/lib</AdditionalLibraryDirectories>
-      <AdditionalDependencies>LLVMAnalysis.lib;LLVMArchive.lib;LLVMAsmPrinter.lib;LLVMBitReader.lib;LLVMBitWriter.lib;LLVMCodeGen.lib;LLVMCore.lib;LLVMExecutionEngine.lib;LLVMInstCombine.lib;LLVMInstrumentation.lib;LLVMipa.lib;LLVMipo.lib;LLVMJIT.lib;LLVMLinker.lib;LLVMMC.lib;LLVMMCParser.lib;LLVMObject.lib;LLVMScalarOpts.lib;LLVMSelectionDAG.lib;LLVMSupport.lib;LLVMTarget.lib;LLVMTransformUtils.lib;LLVMX86ASMPrinter.lib;LLVMX86ASMParser.lib;LLVMX86Utils.lib;LLVMX86CodeGen.lib;LLVMX86Disassembler.lib;LLVMX86Info.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalDependencies>LLVMAnalysis.lib;LLVMArchive.lib;LLVMAsmPrinter.lib;LLVMBitReader.lib;LLVMBitWriter.lib;LLVMCodeGen.lib;LLVMCore.lib;LLVMExecutionEngine.lib;LLVMInstCombine.lib;LLVMInstrumentation.lib;LLVMipa.lib;LLVMipo.lib;LLVMJIT.lib;LLVMLinker.lib;LLVMMC.lib;LLVMMCParser.lib;LLVMObject.lib;LLVMScalarOpts.lib;LLVMSelectionDAG.lib;LLVMSupport.lib;LLVMTarget.lib;LLVMTransformUtils.lib;LLVMX86ASMPrinter.lib;LLVMX86ASMParser.lib;LLVMX86Utils.lib;LLVMX86CodeGen.lib;LLVMX86Disassembler.lib;LLVMX86Desc.lib;LLVMX86Info.lib;%(AdditionalDependencies)</AdditionalDependencies>
     </Link>
   </ItemDefinitionGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
-</Project>
\ No newline at end of file
+</Project>