1 //===-- NVPTXTargetTransformInfo.cpp - NVPTX specific TTI -----------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "NVPTXTargetTransformInfo.h"
11 #include "llvm/Analysis/LoopInfo.h"
12 #include "llvm/Analysis/TargetTransformInfo.h"
13 #include "llvm/Analysis/ValueTracking.h"
14 #include "llvm/CodeGen/BasicTTIImpl.h"
15 #include "llvm/Support/Debug.h"
16 #include "llvm/Target/CostTable.h"
17 #include "llvm/Target/TargetLowering.h"
18 using namespace llvm;
19 
20 #define DEBUG_TYPE "NVPTXtti"
21 
22 unsigned NVPTXTTIImpl::getArithmeticInstrCost(
23     unsigned Opcode, Type *Ty, TTI::OperandValueKind Opd1Info,
24     TTI::OperandValueKind Opd2Info, TTI::OperandValueProperties Opd1PropInfo,
25     TTI::OperandValueProperties Opd2PropInfo) {
26   // Legalize the type.
27   std::pair<unsigned, MVT> LT = TLI->getTypeLegalizationCost(Ty);
28 
29   int ISD = TLI->InstructionOpcodeToISD(Opcode);
30 
31   switch (ISD) {
32   default:
33     return BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
34                                          Opd1PropInfo, Opd2PropInfo);
35   case ISD::ADD:
36   case ISD::MUL:
37   case ISD::XOR:
38   case ISD::OR:
39   case ISD::AND:
40     // The machine code (SASS) simulates an i64 with two i32. Therefore, we
41     // estimate that arithmetic operations on i64 are twice as expensive as
42     // those on types that can fit into one machine register.
43     if (LT.second.SimpleTy == MVT::i64)
44       return 2 * LT.first;
45     // Delegate other cases to the basic TTI.
46     return BaseT::getArithmeticInstrCost(Opcode, Ty, Opd1Info, Opd2Info,
47                                          Opd1PropInfo, Opd2PropInfo);
48   }
49 }
50