xref: /freebsd/contrib/llvm-project/llvm/lib/Target/DirectX/DXILOpBuilder.cpp (revision 972a253a57b6f144b0e4a3e2080a2a0076ec55a0) 
1 //===- DXILOpBuilder.cpp - Helper class for build DIXLOp functions --------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 ///
9 /// \file This file contains class to help build DXIL op functions.
10 //===----------------------------------------------------------------------===//
11 
12 #include "DXILOpBuilder.h"
13 #include "DXILConstants.h"
14 #include "llvm/IR/IRBuilder.h"
15 #include "llvm/IR/Module.h"
16 #include "llvm/Support/DXILOperationCommon.h"
17 #include "llvm/Support/ErrorHandling.h"
18 
19 using namespace llvm;
20 using namespace llvm::DXIL;
21 
22 constexpr StringLiteral DXILOpNamePrefix = "dx.op.";
23 
24 namespace {
25 
26 enum OverloadKind : uint16_t {
27   VOID = 1,
28   HALF = 1 << 1,
29   FLOAT = 1 << 2,
30   DOUBLE = 1 << 3,
31   I1 = 1 << 4,
32   I8 = 1 << 5,
33   I16 = 1 << 6,
34   I32 = 1 << 7,
35   I64 = 1 << 8,
36   UserDefineType = 1 << 9,
37   ObjectType = 1 << 10,
38 };
39 
40 } // namespace
41 
42 static const char *getOverloadTypeName(OverloadKind Kind) {
43   switch (Kind) {
44   case OverloadKind::HALF:
45     return "f16";
46   case OverloadKind::FLOAT:
47     return "f32";
48   case OverloadKind::DOUBLE:
49     return "f64";
50   case OverloadKind::I1:
51     return "i1";
52   case OverloadKind::I8:
53     return "i8";
54   case OverloadKind::I16:
55     return "i16";
56   case OverloadKind::I32:
57     return "i32";
58   case OverloadKind::I64:
59     return "i64";
60   case OverloadKind::VOID:
61   case OverloadKind::ObjectType:
62   case OverloadKind::UserDefineType:
63     break;
64   }
65   llvm_unreachable("invalid overload type for name");
66   return "void";
67 }
68 
69 static OverloadKind getOverloadKind(Type *Ty) {
70   Type::TypeID T = Ty->getTypeID();
71   switch (T) {
72   case Type::VoidTyID:
73     return OverloadKind::VOID;
74   case Type::HalfTyID:
75     return OverloadKind::HALF;
76   case Type::FloatTyID:
77     return OverloadKind::FLOAT;
78   case Type::DoubleTyID:
79     return OverloadKind::DOUBLE;
80   case Type::IntegerTyID: {
81     IntegerType *ITy = cast<IntegerType>(Ty);
82     unsigned Bits = ITy->getBitWidth();
83     switch (Bits) {
84     case 1:
85       return OverloadKind::I1;
86     case 8:
87       return OverloadKind::I8;
88     case 16:
89       return OverloadKind::I16;
90     case 32:
91       return OverloadKind::I32;
92     case 64:
93       return OverloadKind::I64;
94     default:
95       llvm_unreachable("invalid overload type");
96       return OverloadKind::VOID;
97     }
98   }
99   case Type::PointerTyID:
100     return OverloadKind::UserDefineType;
101   case Type::StructTyID:
102     return OverloadKind::ObjectType;
103   default:
104     llvm_unreachable("invalid overload type");
105     return OverloadKind::VOID;
106   }
107 }
108 
109 static std::string getTypeName(OverloadKind Kind, Type *Ty) {
110   if (Kind < OverloadKind::UserDefineType) {
111     return getOverloadTypeName(Kind);
112   } else if (Kind == OverloadKind::UserDefineType) {
113     StructType *ST = cast<StructType>(Ty);
114     return ST->getStructName().str();
115   } else if (Kind == OverloadKind::ObjectType) {
116     StructType *ST = cast<StructType>(Ty);
117     return ST->getStructName().str();
118   } else {
119     std::string Str;
120     raw_string_ostream OS(Str);
121     Ty->print(OS);
122     return OS.str();
123   }
124 }
125 
126 // Static properties.
127 struct OpCodeProperty {
128   DXIL::OpCode OpCode;
129   // Offset in DXILOpCodeNameTable.
130   unsigned OpCodeNameOffset;
131   DXIL::OpCodeClass OpCodeClass;
132   // Offset in DXILOpCodeClassNameTable.
133   unsigned OpCodeClassNameOffset;
134   uint16_t OverloadTys;
135   llvm::Attribute::AttrKind FuncAttr;
136   int OverloadParamIndex;        // parameter index which control the overload.
137                                  // When < 0, should be only 1 overload type.
138   unsigned NumOfParameters;      // Number of parameters include return value.
139   unsigned ParameterTableOffset; // Offset in ParameterTable.
140 };
141 
142 // Include getOpCodeClassName getOpCodeProperty, getOpCodeName and
143 // getOpCodeParameterKind which generated by tableGen.
144 #define DXIL_OP_OPERATION_TABLE
145 #include "DXILOperation.inc"
146 #undef DXIL_OP_OPERATION_TABLE
147 
148 static std::string constructOverloadName(OverloadKind Kind, Type *Ty,
149                                          const OpCodeProperty &Prop) {
150   if (Kind == OverloadKind::VOID) {
151     return (Twine(DXILOpNamePrefix) + getOpCodeClassName(Prop)).str();
152   }
153   return (Twine(DXILOpNamePrefix) + getOpCodeClassName(Prop) + "." +
154           getTypeName(Kind, Ty))
155       .str();
156 }
157 
158 static std::string constructOverloadTypeName(OverloadKind Kind,
159                                              StringRef TypeName) {
160   if (Kind == OverloadKind::VOID)
161     return TypeName.str();
162 
163   assert(Kind < OverloadKind::UserDefineType && "invalid overload kind");
164   return (Twine(TypeName) + getOverloadTypeName(Kind)).str();
165 }
166 
167 static StructType *getOrCreateStructType(StringRef Name,
168                                          ArrayRef<Type *> EltTys,
169                                          LLVMContext &Ctx) {
170   StructType *ST = StructType::getTypeByName(Ctx, Name);
171   if (ST)
172     return ST;
173 
174   return StructType::create(Ctx, EltTys, Name);
175 }
176 
177 static StructType *getResRetType(Type *OverloadTy, LLVMContext &Ctx) {
178   OverloadKind Kind = getOverloadKind(OverloadTy);
179   std::string TypeName = constructOverloadTypeName(Kind, "dx.types.ResRet.");
180   Type *FieldTypes[5] = {OverloadTy, OverloadTy, OverloadTy, OverloadTy,
181                          Type::getInt32Ty(Ctx)};
182   return getOrCreateStructType(TypeName, FieldTypes, Ctx);
183 }
184 
185 static StructType *getHandleType(LLVMContext &Ctx) {
186   return getOrCreateStructType("dx.types.Handle", Type::getInt8PtrTy(Ctx), Ctx);
187 }
188 
189 static Type *getTypeFromParameterKind(ParameterKind Kind, Type *OverloadTy) {
190   auto &Ctx = OverloadTy->getContext();
191   switch (Kind) {
192   case ParameterKind::VOID:
193     return Type::getVoidTy(Ctx);
194   case ParameterKind::HALF:
195     return Type::getHalfTy(Ctx);
196   case ParameterKind::FLOAT:
197     return Type::getFloatTy(Ctx);
198   case ParameterKind::DOUBLE:
199     return Type::getDoubleTy(Ctx);
200   case ParameterKind::I1:
201     return Type::getInt1Ty(Ctx);
202   case ParameterKind::I8:
203     return Type::getInt8Ty(Ctx);
204   case ParameterKind::I16:
205     return Type::getInt16Ty(Ctx);
206   case ParameterKind::I32:
207     return Type::getInt32Ty(Ctx);
208   case ParameterKind::I64:
209     return Type::getInt64Ty(Ctx);
210   case ParameterKind::OVERLOAD:
211     return OverloadTy;
212   case ParameterKind::RESOURCE_RET:
213     return getResRetType(OverloadTy, Ctx);
214   case ParameterKind::DXIL_HANDLE:
215     return getHandleType(Ctx);
216   default:
217     break;
218   }
219   llvm_unreachable("Invalid parameter kind");
220   return nullptr;
221 }
222 
223 static FunctionType *getDXILOpFunctionType(const OpCodeProperty *Prop,
224                                            Type *OverloadTy) {
225   SmallVector<Type *> ArgTys;
226 
227   auto ParamKinds = getOpCodeParameterKind(*Prop);
228 
229   for (unsigned I = 0; I < Prop->NumOfParameters; ++I) {
230     ParameterKind Kind = ParamKinds[I];
231     ArgTys.emplace_back(getTypeFromParameterKind(Kind, OverloadTy));
232   }
233   return FunctionType::get(
234       ArgTys[0], ArrayRef<Type *>(&ArgTys[1], ArgTys.size() - 1), false);
235 }
236 
237 static FunctionCallee getOrCreateDXILOpFunction(DXIL::OpCode DXILOp,
238                                                 Type *OverloadTy, Module &M) {
239   const OpCodeProperty *Prop = getOpCodeProperty(DXILOp);
240 
241   OverloadKind Kind = getOverloadKind(OverloadTy);
242   // FIXME: find the issue and report error in clang instead of check it in
243   // backend.
244   if ((Prop->OverloadTys & (uint16_t)Kind) == 0) {
245     llvm_unreachable("invalid overload");
246   }
247 
248   std::string FnName = constructOverloadName(Kind, OverloadTy, *Prop);
249   // Dependent on name to dedup.
250   if (auto *Fn = M.getFunction(FnName))
251     return FunctionCallee(Fn);
252 
253   FunctionType *DXILOpFT = getDXILOpFunctionType(Prop, OverloadTy);
254   return M.getOrInsertFunction(FnName, DXILOpFT);
255 }
256 
257 namespace llvm {
258 namespace DXIL {
259 
260 CallInst *DXILOpBuilder::createDXILOpCall(DXIL::OpCode OpCode, Type *OverloadTy,
261                                           llvm::iterator_range<Use *> Args) {
262   auto Fn = getOrCreateDXILOpFunction(OpCode, OverloadTy, M);
263   SmallVector<Value *> FullArgs;
264   FullArgs.emplace_back(B.getInt32((int32_t)OpCode));
265   FullArgs.append(Args.begin(), Args.end());
266   return B.CreateCall(Fn, FullArgs);
267 }
268 
269 Type *DXILOpBuilder::getOverloadTy(DXIL::OpCode OpCode, FunctionType *FT,
270                                    bool NoOpCodeParam) {
271 
272   const OpCodeProperty *Prop = getOpCodeProperty(OpCode);
273   if (Prop->OverloadParamIndex < 0) {
274     auto &Ctx = FT->getContext();
275     // When only has 1 overload type, just return it.
276     switch (Prop->OverloadTys) {
277     case OverloadKind::VOID:
278       return Type::getVoidTy(Ctx);
279     case OverloadKind::HALF:
280       return Type::getHalfTy(Ctx);
281     case OverloadKind::FLOAT:
282       return Type::getFloatTy(Ctx);
283     case OverloadKind::DOUBLE:
284       return Type::getDoubleTy(Ctx);
285     case OverloadKind::I1:
286       return Type::getInt1Ty(Ctx);
287     case OverloadKind::I8:
288       return Type::getInt8Ty(Ctx);
289     case OverloadKind::I16:
290       return Type::getInt16Ty(Ctx);
291     case OverloadKind::I32:
292       return Type::getInt32Ty(Ctx);
293     case OverloadKind::I64:
294       return Type::getInt64Ty(Ctx);
295     default:
296       llvm_unreachable("invalid overload type");
297       return nullptr;
298     }
299   }
300 
301   // Prop->OverloadParamIndex is 0, overload type is FT->getReturnType().
302   Type *OverloadType = FT->getReturnType();
303   if (Prop->OverloadParamIndex != 0) {
304     // Skip Return Type and Type for DXIL opcode.
305     const unsigned SkipedParam = NoOpCodeParam ? 2 : 1;
306     OverloadType = FT->getParamType(Prop->OverloadParamIndex - SkipedParam);
307   }
308 
309   auto ParamKinds = getOpCodeParameterKind(*Prop);
310   auto Kind = ParamKinds[Prop->OverloadParamIndex];
311   // For ResRet and CBufferRet, OverloadTy is in field of StructType.
312   if (Kind == ParameterKind::CBUFFER_RET ||
313       Kind == ParameterKind::RESOURCE_RET) {
314     auto *ST = cast<StructType>(OverloadType);
315     OverloadType = ST->getElementType(0);
316   }
317   return OverloadType;
318 }
319 
320 const char *DXILOpBuilder::getOpCodeName(DXIL::OpCode DXILOp) {
321   return ::getOpCodeName(DXILOp);
322 }
323 } // namespace DXIL
324 } // namespace llvm
325