1 //===- NVPTXRegisterInfo.cpp - NVPTX Register Information -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the NVPTX implementation of the TargetRegisterInfo class.
12 //===----------------------------------------------------------------------===//
14 #include "NVPTXRegisterInfo.h"
16 #include "NVPTXSubtarget.h"
17 #include "llvm/ADT/BitVector.h"
18 #include "llvm/CodeGen/MachineFrameInfo.h"
19 #include "llvm/CodeGen/MachineFunction.h"
20 #include "llvm/CodeGen/MachineInstrBuilder.h"
21 #include "llvm/MC/MachineLocation.h"
22 #include "llvm/Target/TargetInstrInfo.h"
26 #define DEBUG_TYPE "nvptx-reg-info"
29 std::string getNVPTXRegClassName(TargetRegisterClass const *RC) {
30 if (RC == &NVPTX::Float32RegsRegClass) {
33 if (RC == &NVPTX::Float64RegsRegClass) {
35 } else if (RC == &NVPTX::Int64RegsRegClass) {
36 // We use untyped (.b) integer registers here as NVCC does.
37 // Correctness of generated code does not depend on register type,
38 // but using .s/.u registers runs into ptxas bug that prevents
39 // assembly of otherwise valid PTX into SASS. Despite PTX ISA
40 // specifying only argument size for fp16 instructions, ptxas does
41 // not allow using .s16 or .u16 arguments for .fp16
42 // instructions. At the same time it allows using .s32/.u32
43 // arguments for .fp16v2 instructions:
47 // add.f16 rb16,rb16,rb16; // OK
48 // add.f16 rs16,rs16,rs16; // Arguments mismatch for instruction 'add'
52 // add.f16v2 rb32,rb32,rb32; // OK
53 // add.f16v2 rs32,rs32,rs32; // OK
55 } else if (RC == &NVPTX::Int32RegsRegClass) {
57 } else if (RC == &NVPTX::Int16RegsRegClass) {
59 } else if (RC == &NVPTX::Int1RegsRegClass) {
61 } else if (RC == &NVPTX::SpecialRegsRegClass) {
69 std::string getNVPTXRegClassStr(TargetRegisterClass const *RC) {
70 if (RC == &NVPTX::Float32RegsRegClass) {
73 if (RC == &NVPTX::Float64RegsRegClass) {
75 } else if (RC == &NVPTX::Int64RegsRegClass) {
77 } else if (RC == &NVPTX::Int32RegsRegClass) {
79 } else if (RC == &NVPTX::Int16RegsRegClass) {
81 } else if (RC == &NVPTX::Int1RegsRegClass) {
83 } else if (RC == &NVPTX::SpecialRegsRegClass) {
92 NVPTXRegisterInfo::NVPTXRegisterInfo() : NVPTXGenRegisterInfo(0) {}
94 #define GET_REGINFO_TARGET_DESC
95 #include "NVPTXGenRegisterInfo.inc"
97 /// NVPTX Callee Saved Registers
99 NVPTXRegisterInfo::getCalleeSavedRegs(const MachineFunction *) const {
100 static const MCPhysReg CalleeSavedRegs[] = { 0 };
101 return CalleeSavedRegs;
104 BitVector NVPTXRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
105 BitVector Reserved(getNumRegs());
109 void NVPTXRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
110 int SPAdj, unsigned FIOperandNum,
111 RegScavenger *RS) const {
112 assert(SPAdj == 0 && "Unexpected");
114 MachineInstr &MI = *II;
115 int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
117 MachineFunction &MF = *MI.getParent()->getParent();
118 int Offset = MF.getFrameInfo().getObjectOffset(FrameIndex) +
119 MI.getOperand(FIOperandNum + 1).getImm();
121 // Using I0 as the frame pointer
122 MI.getOperand(FIOperandNum).ChangeToRegister(NVPTX::VRFrame, false);
123 MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
126 unsigned NVPTXRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
127 return NVPTX::VRFrame;