[DirectX] Rename DXILOperationCommon.h to DXILABI.h. NFC

This is a good place to put all of the ABI-sensitive DXIL values that
we'll need in both reading and writing contexts.

Pull Request: #78224

Author: bogner

llvm/include/llvm/Support/DXILABI.h

@@ -0,0 +1,45 @@
+//===-- DXILABI.h - ABI Sensitive Values for DXIL ---------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains definitions of various constants and enums that are
+// required to remain stable as per the DXIL format's requirements.
+//
+// Documentation for DXIL can be found in
+// https://github.com/Microsoft/DirectXShaderCompiler/blob/main/docs/DXIL.rst.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SUPPORT_DXILABI_H
+#define LLVM_SUPPORT_DXILABI_H
+
+#include "llvm/ADT/StringSwitch.h"
+
+namespace llvm {
+namespace dxil {
+
+enum class ParameterKind : uint8_t {
+  INVALID = 0,
+  VOID,
+  HALF,
+  FLOAT,
+  DOUBLE,
+  I1,
+  I8,
+  I16,
+  I32,
+  I64,
+  OVERLOAD,
+  CBUFFER_RET,
+  RESOURCE_RET,
+  DXIL_HANDLE,
+};
+
+} // namespace dxil
+} // namespace llvm
+
+#endif // LLVM_SUPPORT_DXILABI_H

llvm/include/llvm/Support/DXILOperationCommon.h

@@ -13,7 +13,7 @@
 #include "DXILConstants.h"
 #include "llvm/IR/IRBuilder.h"
 #include "llvm/IR/Module.h"
-#include "llvm/Support/DXILOperationCommon.h"
+#include "llvm/Support/DXILABI.h"
 #include "llvm/Support/ErrorHandling.h"
 
 using namespace llvm;

llvm/lib/Target/DirectX/DXILOpBuilder.cpp

@@ -16,7 +16,7 @@
 #include "llvm/ADT/SmallVector.h"
 #include "llvm/ADT/StringSet.h"
 #include "llvm/ADT/StringSwitch.h"
-#include "llvm/Support/DXILOperationCommon.h"
+#include "llvm/Support/DXILABI.h"
 #include "llvm/TableGen/Record.h"
 #include "llvm/TableGen/TableGenBackend.h"
 
@@ -103,6 +103,24 @@ struct DXILOperationData {
 };
 } // end anonymous namespace
 
+static ParameterKind parameterTypeNameToKind(StringRef Name) {
+  return StringSwitch<ParameterKind>(Name)
+      .Case("void", ParameterKind::VOID)
+      .Case("half", ParameterKind::HALF)
+      .Case("float", ParameterKind::FLOAT)
+      .Case("double", ParameterKind::DOUBLE)
+      .Case("i1", ParameterKind::I1)
+      .Case("i8", ParameterKind::I8)
+      .Case("i16", ParameterKind::I16)
+      .Case("i32", ParameterKind::I32)
+      .Case("i64", ParameterKind::I64)
+      .Case("$o", ParameterKind::OVERLOAD)
+      .Case("dx.types.Handle", ParameterKind::DXIL_HANDLE)
+      .Case("dx.types.CBufRet", ParameterKind::CBUFFER_RET)
+      .Case("dx.types.ResRet", ParameterKind::RESOURCE_RET)
+      .Default(ParameterKind::INVALID);
+}
+
 DXILParam::DXILParam(const Record *R) {
   Name = R->getValueAsString("name");
   Pos = R->getValueAsInt("pos");