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//===-- SparcSubtarget.cpp - SPARC Subtarget Information ------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the SPARC specific subclass of TargetSubtargetInfo.
//
//===----------------------------------------------------------------------===//
#include "SparcSubtarget.h"
#include "Sparc.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/MathExtras.h"
using namespace llvm;
#define DEBUG_TYPE "sparc-subtarget"
#define GET_SUBTARGETINFO_TARGET_DESC
#define GET_SUBTARGETINFO_CTOR
#include "SparcGenSubtargetInfo.inc"
void SparcSubtarget::anchor() { }
SparcSubtarget &SparcSubtarget::initializeSubtargetDependencies(StringRef CPU,
StringRef FS) {
// Determine default and user specified characteristics
std::string CPUName = std::string(CPU);
if (CPUName.empty())
CPUName = (Is64Bit) ? "v9" : "v8";
// Parse features string.
ParseSubtargetFeatures(CPUName, /*TuneCPU*/ CPUName, FS);
// Popc is a v9-only instruction.
if (!IsV9)
UsePopc = false;
return *this;
}
SparcSubtarget::SparcSubtarget(const Triple &TT, const std::string &CPU,
const std::string &FS, const TargetMachine &TM,
bool is64Bit)
: SparcGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS), TargetTriple(TT),
Is64Bit(is64Bit), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
TLInfo(TM, *this), FrameLowering(*this) {}
int SparcSubtarget::getAdjustedFrameSize(int frameSize) const {
if (is64Bit()) {
// All 64-bit stack frames must be 16-byte aligned, and must reserve space
// for spilling the 16 window registers at %sp+BIAS..%sp+BIAS+128.
frameSize += 128;
// Frames with calls must also reserve space for 6 outgoing arguments
// whether they are used or not. LowerCall_64 takes care of that.
frameSize = alignTo(frameSize, 16);
} else {
// Emit the correct save instruction based on the number of bytes in
// the frame. Minimum stack frame size according to V8 ABI is:
// 16 words for register window spill
// 1 word for address of returned aggregate-value
// + 6 words for passing parameters on the stack
// ----------
// 23 words * 4 bytes per word = 92 bytes
frameSize += 92;
// Round up to next doubleword boundary -- a double-word boundary
// is required by the ABI.
frameSize = alignTo(frameSize, 8);
}
return frameSize;
}
bool SparcSubtarget::enableMachineScheduler() const {
return true;
}
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