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      1 //===-- CostTable.h - Instruction Cost Table handling -----------*- C++ -*-===//
      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
     10 /// Cost tables and simple lookup functions
     11 ///
     12 //===----------------------------------------------------------------------===//
     13 
     14 #ifndef LLVM_CODEGEN_COSTTABLE_H_
     15 #define LLVM_CODEGEN_COSTTABLE_H_
     16 
     17 #include "llvm/ADT/ArrayRef.h"
     18 #include "llvm/ADT/STLExtras.h"
     19 #include "llvm/Support/MachineValueType.h"
     20 
     21 namespace llvm {
     22 
     23 /// Cost Table Entry
     24 struct CostTblEntry {
     25   int ISD;
     26   MVT::SimpleValueType Type;
     27   unsigned Cost;
     28 };
     29 
     30 /// Find in cost table, TypeTy must be comparable to CompareTy by ==
     31 inline const CostTblEntry *CostTableLookup(ArrayRef<CostTblEntry> Tbl,
     32                                            int ISD, MVT Ty) {
     33   auto I = find_if(Tbl, [=](const CostTblEntry &Entry) {
     34     return ISD == Entry.ISD && Ty == Entry.Type;
     35   });
     36   if (I != Tbl.end())
     37     return I;
     38 
     39   // Could not find an entry.
     40   return nullptr;
     41 }
     42 
     43 /// Type Conversion Cost Table
     44 struct TypeConversionCostTblEntry {
     45   int ISD;
     46   MVT::SimpleValueType Dst;
     47   MVT::SimpleValueType Src;
     48   unsigned Cost;
     49 };
     50 
     51 /// Find in type conversion cost table, TypeTy must be comparable to CompareTy
     52 /// by ==
     53 inline const TypeConversionCostTblEntry *
     54 ConvertCostTableLookup(ArrayRef<TypeConversionCostTblEntry> Tbl,
     55                        int ISD, MVT Dst, MVT Src) {
     56   auto I = find_if(Tbl, [=](const TypeConversionCostTblEntry &Entry) {
     57     return ISD == Entry.ISD && Src == Entry.Src && Dst == Entry.Dst;
     58   });
     59   if (I != Tbl.end())
     60     return I;
     61 
     62   // Could not find an entry.
     63   return nullptr;
     64 }
     65 
     66 } // namespace llvm
     67 
     68 #endif /* LLVM_CODEGEN_COSTTABLE_H_ */
     69