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//===-- AMDGPUAsmPrinter.cpp - AMDGPU Assebly printer --------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// The AMDGPUAsmPrinter is used to print both assembly string and also binary
// code. When passed an MCAsmStreamer it prints assembly and when passed
// an MCObjectStreamer it outputs binary code.
//
//===----------------------------------------------------------------------===//
//
#include "AMDGPUAsmPrinter.h"
#include "AMDGPU.h"
#include "SIMachineFunctionInfo.h"
#include "SIRegisterInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
static AsmPrinter *createAMDGPUAsmPrinterPass(TargetMachine &tm,
MCStreamer &Streamer) {
return new AMDGPUAsmPrinter(tm, Streamer);
}
extern "C" void LLVMInitializeAMDGPUAsmPrinter() {
TargetRegistry::RegisterAsmPrinter(TheAMDGPUTarget, createAMDGPUAsmPrinterPass);
}
/// runOnMachineFunction - We need to override this function so we can avoid
/// the call to EmitFunctionHeader(), which the MCPureStreamer can't handle.
bool AMDGPUAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
const AMDGPUSubtarget &STM = TM.getSubtarget<AMDGPUSubtarget>();
if (STM.dumpCode()) {
MF.dump();
}
SetupMachineFunction(MF);
if (STM.device()->getGeneration() > AMDGPUDeviceInfo::HD6XXX) {
EmitProgramInfo(MF);
}
OutStreamer.SwitchSection(getObjFileLowering().getTextSection());
EmitFunctionBody();
return false;
}
void AMDGPUAsmPrinter::EmitProgramInfo(MachineFunction &MF) {
unsigned MaxSGPR = 0;
unsigned MaxVGPR = 0;
bool VCCUsed = false;
const SIRegisterInfo * RI =
static_cast<const SIRegisterInfo*>(TM.getRegisterInfo());
for (MachineFunction::iterator BB = MF.begin(), BB_E = MF.end();
BB != BB_E; ++BB) {
MachineBasicBlock &MBB = *BB;
for (MachineBasicBlock::iterator I = MBB.begin(), E = MBB.end();
I != E; ++I) {
MachineInstr &MI = *I;
unsigned numOperands = MI.getNumOperands();
for (unsigned op_idx = 0; op_idx < numOperands; op_idx++) {
MachineOperand & MO = MI.getOperand(op_idx);
unsigned maxUsed;
unsigned width = 0;
bool isSGPR = false;
unsigned reg;
unsigned hwReg;
if (!MO.isReg()) {
continue;
}
reg = MO.getReg();
if (reg == AMDGPU::VCC) {
VCCUsed = true;
continue;
}
if (reg == AMDGPU::EXEC) {
continue;
}
if (AMDGPU::SReg_32RegClass.contains(reg)) {
isSGPR = true;
width = 1;
} else if (AMDGPU::VReg_32RegClass.contains(reg)) {
isSGPR = false;
width = 1;
} else if (AMDGPU::SReg_64RegClass.contains(reg)) {
isSGPR = true;
width = 2;
} else if (AMDGPU::VReg_64RegClass.contains(reg)) {
isSGPR = false;
width = 2;
} else if (AMDGPU::SReg_128RegClass.contains(reg)) {
isSGPR = true;
width = 4;
} else if (AMDGPU::VReg_128RegClass.contains(reg)) {
isSGPR = false;
width = 4;
} else if (AMDGPU::SReg_256RegClass.contains(reg)) {
isSGPR = true;
width = 8;
} else {
assert(!"Unknown register class");
}
hwReg = RI->getHWRegNum(reg);
maxUsed = hwReg + width - 1;
if (isSGPR) {
MaxSGPR = maxUsed > MaxSGPR ? maxUsed : MaxSGPR;
} else {
MaxVGPR = maxUsed > MaxVGPR ? maxUsed : MaxVGPR;
}
}
}
}
if (VCCUsed) {
MaxSGPR += 2;
}
SIMachineFunctionInfo * MFI = MF.getInfo<SIMachineFunctionInfo>();
OutStreamer.EmitIntValue(MaxSGPR + 1, 4);
OutStreamer.EmitIntValue(MaxVGPR + 1, 4);
OutStreamer.EmitIntValue(MFI->spi_ps_input_addr, 4);
}
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