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//===- NVPTXRegisterInfo.cpp - NVPTX Register Information -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the NVPTX implementation of the TargetRegisterInfo class.
//
//===----------------------------------------------------------------------===//
#include "NVPTXRegisterInfo.h"
#include "NVPTX.h"
#include "NVPTXSubtarget.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/MC/MachineLocation.h"
using namespace llvm;
#define DEBUG_TYPE "nvptx-reg-info"
namespace llvm {
std::string getNVPTXRegClassName(TargetRegisterClass const *RC) {
if (RC == &NVPTX::Float32RegsRegClass)
return ".f32";
if (RC == &NVPTX::Float16RegsRegClass)
// Ideally fp16 registers should be .f16, but this syntax is only
// supported on sm_53+. On the other hand, .b16 registers are
// accepted for all supported fp16 instructions on all GPU
// variants, so we can use them instead.
return ".b16";
if (RC == &NVPTX::Float16x2RegsRegClass)
return ".b32";
if (RC == &NVPTX::Float64RegsRegClass)
return ".f64";
if (RC == &NVPTX::Int64RegsRegClass)
// We use untyped (.b) integer registers here as NVCC does.
// Correctness of generated code does not depend on register type,
// but using .s/.u registers runs into ptxas bug that prevents
// assembly of otherwise valid PTX into SASS. Despite PTX ISA
// specifying only argument size for fp16 instructions, ptxas does
// not allow using .s16 or .u16 arguments for .fp16
// instructions. At the same time it allows using .s32/.u32
// arguments for .fp16v2 instructions:
//
// .reg .b16 rb16
// .reg .s16 rs16
// add.f16 rb16,rb16,rb16; // OK
// add.f16 rs16,rs16,rs16; // Arguments mismatch for instruction 'add'
// but:
// .reg .b32 rb32
// .reg .s32 rs32
// add.f16v2 rb32,rb32,rb32; // OK
// add.f16v2 rs32,rs32,rs32; // OK
return ".b64";
if (RC == &NVPTX::Int32RegsRegClass)
return ".b32";
if (RC == &NVPTX::Int16RegsRegClass)
return ".b16";
if (RC == &NVPTX::Int1RegsRegClass)
return ".pred";
if (RC == &NVPTX::SpecialRegsRegClass)
return "!Special!";
return "INTERNAL";
}
std::string getNVPTXRegClassStr(TargetRegisterClass const *RC) {
if (RC == &NVPTX::Float32RegsRegClass)
return "%f";
if (RC == &NVPTX::Float16RegsRegClass)
return "%h";
if (RC == &NVPTX::Float16x2RegsRegClass)
return "%hh";
if (RC == &NVPTX::Float64RegsRegClass)
return "%fd";
if (RC == &NVPTX::Int64RegsRegClass)
return "%rd";
if (RC == &NVPTX::Int32RegsRegClass)
return "%r";
if (RC == &NVPTX::Int16RegsRegClass)
return "%rs";
if (RC == &NVPTX::Int1RegsRegClass)
return "%p";
if (RC == &NVPTX::SpecialRegsRegClass)
return "!Special!";
return "INTERNAL";
}
}
NVPTXRegisterInfo::NVPTXRegisterInfo() : NVPTXGenRegisterInfo(0) {}
#define GET_REGINFO_TARGET_DESC
#include "NVPTXGenRegisterInfo.inc"
/// NVPTX Callee Saved Registers
const MCPhysReg *
NVPTXRegisterInfo::getCalleeSavedRegs(const MachineFunction *) const {
static const MCPhysReg CalleeSavedRegs[] = { 0 };
return CalleeSavedRegs;
}
BitVector NVPTXRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
return Reserved;
}
void NVPTXRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
int SPAdj, unsigned FIOperandNum,
RegScavenger *RS) const {
assert(SPAdj == 0 && "Unexpected");
MachineInstr &MI = *II;
int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
MachineFunction &MF = *MI.getParent()->getParent();
int Offset = MF.getFrameInfo().getObjectOffset(FrameIndex) +
MI.getOperand(FIOperandNum + 1).getImm();
// Using I0 as the frame pointer
MI.getOperand(FIOperandNum).ChangeToRegister(NVPTX::VRFrame, false);
MI.getOperand(FIOperandNum + 1).ChangeToImmediate(Offset);
}
unsigned NVPTXRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
return NVPTX::VRFrame;
}
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