Add a header file for enum IIT_Info, NFC

[craig.topper]

TableGen cannot import a file from the IR directory. It will be considered a layering violation even though its only a header dependency.

[GBuella]

In D46119#1079551, @craig.topper wrote:

TableGen cannot import a file from the IR directory. It will be considered a layering violation even though its only a header dependency.

OK, so where else could such a header go?

[craig.topper]

The only place you could put it is in include/llvm/Support. I suspect this is why the content was duplicated like this.

[dblaikie]

In D46119#1079870, @craig.topper wrote:

The only place you could put it is in include/llvm/Support. I suspect this is why the content was duplicated like this.

Yep! Thanks for the catch, Craig!

[GBuella]

Well, putting it under include/llvm/Support just sounds weird.
Nevermind, we can survive this enum. Just need to fix the comment referencing the lib/VMCore/Function.cpp file.

[craig.topper]

It wouldn't be the only weird file in support. See MachineValueType.h, and X86DisassemblerDecodercommon.h as recent examples.

If you want to just fix the comment to say IR instead of VMCore, feel free to do that without a review.

include/llvm/IR/IIT_Info.h

+//===--------------------------- IIT_Info.h ---------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_IIT_INFO_H
+#define LLVM_IR_IIT_INFO_H
+
+namespace llvm {
+
+/// IIT_Info - These are enumerators that describe the entries returned by the
+/// getIntrinsicInfoTableEntries function.
+///
+/// NOTE: These constants are also used in TblGen/IntrinsicEmitter!
+enum IIT_Info {
+  // Common values should be encoded with 0-15.
+  IIT_Done = 0,
+  IIT_I1   = 1,
+  IIT_I8   = 2,
+  IIT_I16  = 3,
+  IIT_I32  = 4,
+  IIT_I64  = 5,
+  IIT_F16  = 6,
+  IIT_F32  = 7,
+  IIT_F64  = 8,
+  IIT_V2   = 9,
+  IIT_V4   = 10,
+  IIT_V8   = 11,
+  IIT_V16  = 12,
+  IIT_V32  = 13,
+  IIT_PTR  = 14,
+  IIT_ARG  = 15,
+
+  // Values from 16+ are only encodable with the inefficient encoding.
+  IIT_V64  = 16,
+  IIT_MMX  = 17,
+  IIT_TOKEN = 18,
+  IIT_METADATA = 19,
+  IIT_EMPTYSTRUCT = 20,
+  IIT_STRUCT2 = 21,
+  IIT_STRUCT3 = 22,
+  IIT_STRUCT4 = 23,
+  IIT_STRUCT5 = 24,
+  IIT_EXTEND_ARG = 25,
+  IIT_TRUNC_ARG = 26,
+  IIT_ANYPTR = 27,
+  IIT_V1   = 28,
+  IIT_VARARG = 29,
+  IIT_HALF_VEC_ARG = 30,
+  IIT_SAME_VEC_WIDTH_ARG = 31,
+  IIT_PTR_TO_ARG = 32,
+  IIT_PTR_TO_ELT = 33,
+  IIT_VEC_OF_ANYPTRS_TO_ELT = 34,
+  IIT_I128 = 35,
+  IIT_V512 = 36,
+  IIT_V1024 = 37,
+  IIT_STRUCT6 = 38,
+  IIT_STRUCT7 = 39,
+  IIT_STRUCT8 = 40
+};
+
+} // End llvm namespace
+
+#endif

lib/IR/Function.cpp

 #include "llvm/IR/Argument.h"
 #include "llvm/IR/Attributes.h"
 #include "llvm/IR/BasicBlock.h"
 #include "llvm/IR/CallSite.h"
 #include "llvm/IR/Constant.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/IIT_Info.h"
 #include "llvm/IR/InstIterator.h"
 #include "llvm/IR/Instruction.h"
 #include "llvm/IR/Instructions.h"
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/MDBuilder.h"
 #include "llvm/IR/Metadata.h"
std::string Intrinsic::getName(ID id, ArrayRef<Type*> Tys) {
   assert(id < num_intrinsics && "Invalid intrinsic ID!");
   std::string Result(IntrinsicNameTable[id]);
   for (Type *Ty : Tys) {
     Result += "." + getMangledTypeStr(Ty);
   }
   return Result;
 }
 
-/// IIT_Info - These are enumerators that describe the entries returned by the
-/// getIntrinsicInfoTableEntries function.
-///
-/// NOTE: This must be kept in synch with the copy in TblGen/IntrinsicEmitter!
-enum IIT_Info {
-  // Common values should be encoded with 0-15.
-  IIT_Done = 0,
-  IIT_I1   = 1,
-  IIT_I8   = 2,
-  IIT_I16  = 3,
-  IIT_I32  = 4,
-  IIT_I64  = 5,
-  IIT_F16  = 6,
-  IIT_F32  = 7,
-  IIT_F64  = 8,
-  IIT_V2   = 9,
-  IIT_V4   = 10,
-  IIT_V8   = 11,
-  IIT_V16  = 12,
-  IIT_V32  = 13,
-  IIT_PTR  = 14,
-  IIT_ARG  = 15,
-
-  // Values from 16+ are only encodable with the inefficient encoding.
-  IIT_V64  = 16,
-  IIT_MMX  = 17,
-  IIT_TOKEN = 18,
-  IIT_METADATA = 19,
-  IIT_EMPTYSTRUCT = 20,
-  IIT_STRUCT2 = 21,
-  IIT_STRUCT3 = 22,
-  IIT_STRUCT4 = 23,
-  IIT_STRUCT5 = 24,
-  IIT_EXTEND_ARG = 25,
-  IIT_TRUNC_ARG = 26,
-  IIT_ANYPTR = 27,
-  IIT_V1   = 28,
-  IIT_VARARG = 29,
-  IIT_HALF_VEC_ARG = 30,
-  IIT_SAME_VEC_WIDTH_ARG = 31,
-  IIT_PTR_TO_ARG = 32,
-  IIT_PTR_TO_ELT = 33,
-  IIT_VEC_OF_ANYPTRS_TO_ELT = 34,
-  IIT_I128 = 35,
-  IIT_V512 = 36,
-  IIT_V1024 = 37,
-  IIT_STRUCT6 = 38,
-  IIT_STRUCT7 = 39,
-  IIT_STRUCT8 = 40
-};
-
 static void DecodeIITType(unsigned &NextElt, ArrayRef<unsigned char> Infos,
                       SmallVectorImpl<Intrinsic::IITDescriptor> &OutputTable) {
   using namespace Intrinsic;
 
   IIT_Info Info = IIT_Info(Infos[NextElt++]);
   unsigned StructElts = 2;
 
   switch (Info) {

utils/TableGen/IntrinsicEmitter.cpp

 //
 //===----------------------------------------------------------------------===//
 
 #include "CodeGenIntrinsics.h"
 #include "CodeGenTarget.h"
 #include "SequenceToOffsetTable.h"
 #include "TableGenBackends.h"
 #include "llvm/ADT/StringExtras.h"
+#include "llvm/IR/IIT_Info.h"
 #include "llvm/TableGen/Error.h"
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/StringMatcher.h"
 #include "llvm/TableGen/TableGenBackend.h"
 #include "llvm/TableGen/StringToOffsetTable.h"
 #include <algorithm>
 using namespace llvm;
 
if (Ints[i].isOverloaded)
       OS << " | (1<<" << (i+1)%8 << ')';
   }
   OS << "\n};\n\n";
   // OTable contains a true bit at the position if the intrinsic is overloaded.
   OS << "return (OTable[id/8] & (1 << (id%8))) != 0;\n";
   OS << "#endif\n\n";
 }
 
-
-// NOTE: This must be kept in synch with the copy in lib/VMCore/Function.cpp!
-enum IIT_Info {
-  // Common values should be encoded with 0-15.
-  IIT_Done = 0,
-  IIT_I1   = 1,
-  IIT_I8   = 2,
-  IIT_I16  = 3,
-  IIT_I32  = 4,
-  IIT_I64  = 5,
-  IIT_F16  = 6,
-  IIT_F32  = 7,
-  IIT_F64  = 8,
-  IIT_V2   = 9,
-  IIT_V4   = 10,
-  IIT_V8   = 11,
-  IIT_V16  = 12,
-  IIT_V32  = 13,
-  IIT_PTR  = 14,
-  IIT_ARG  = 15,
-
-  // Values from 16+ are only encodable with the inefficient encoding.
-  IIT_V64  = 16,
-  IIT_MMX  = 17,
-  IIT_TOKEN = 18,
-  IIT_METADATA = 19,
-  IIT_EMPTYSTRUCT = 20,
-  IIT_STRUCT2 = 21,
-  IIT_STRUCT3 = 22,
-  IIT_STRUCT4 = 23,
-  IIT_STRUCT5 = 24,
-  IIT_EXTEND_ARG = 25,
-  IIT_TRUNC_ARG = 26,
-  IIT_ANYPTR = 27,
-  IIT_V1   = 28,
-  IIT_VARARG = 29,
-  IIT_HALF_VEC_ARG = 30,
-  IIT_SAME_VEC_WIDTH_ARG = 31,
-  IIT_PTR_TO_ARG = 32,
-  IIT_PTR_TO_ELT = 33,
-  IIT_VEC_OF_ANYPTRS_TO_ELT = 34,
-  IIT_I128 = 35,
-  IIT_V512 = 36,
-  IIT_V1024 = 37,
-  IIT_STRUCT6 = 38,
-  IIT_STRUCT7 = 39,
-  IIT_STRUCT8 = 40
-};
-
 static void EncodeFixedValueType(MVT::SimpleValueType VT,
                                  std::vector<unsigned char> &Sig) {
   if (MVT(VT).isInteger()) {
     unsigned BitWidth = MVT(VT).getSizeInBits();
     switch (BitWidth) {
     default: PrintFatalError("unhandled integer type width in intrinsic!");
     case 1: return Sig.push_back(IIT_I1);
     case 8: return Sig.push_back(IIT_I8);