-//===- MipsSubtarget.cpp - Mips Subtarget Information -----------*- C++ -*-===//
+//===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
//
-// This file implements the Mips specific subclass of TargetSubtarget.
+// This file implements the Mips specific subclass of TargetSubtargetInfo.
//
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "mips-subtarget"
+
+#include "MipsMachineFunction.h"
#include "MipsSubtarget.h"
+#include "MipsTargetMachine.h"
#include "Mips.h"
-#include "MipsGenSubtarget.inc"
-#include "llvm/Module.h"
+#include "MipsRegisterInfo.h"
+#include "llvm/IR/Attributes.h"
+#include "llvm/IR/Function.h"
#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+
+#define GET_SUBTARGETINFO_TARGET_DESC
+#define GET_SUBTARGETINFO_CTOR
+#include "MipsGenSubtargetInfo.inc"
+
+
using namespace llvm;
-cl::opt<bool> NotABICall("disable-mips-abicall", cl::Hidden,
- cl::desc("Disable code for SVR4-style dynamic objects"));
-cl::opt<bool> AbsoluteCall("enable-mips-absolute-call", cl::Hidden,
- cl::desc("Enable absolute call within abicall"));
+// FIXME: Maybe this should be on by default when Mips16 is specified
+//
+static cl::opt<bool> Mixed16_32(
+ "mips-mixed-16-32",
+ cl::init(false),
+ cl::desc("Allow for a mixture of Mips16 "
+ "and Mips32 code in a single source file"),
+ cl::Hidden);
+
+static cl::opt<bool> Mips_Os16(
+ "mips-os16",
+ cl::init(false),
+ cl::desc("Compile all functions that don' use "
+ "floating point as Mips 16"),
+ cl::Hidden);
+
+static cl::opt<bool>
+Mips16HardFloat("mips16-hard-float", cl::NotHidden,
+ cl::desc("MIPS: mips16 hard float enable."),
+ cl::init(false));
+
+void MipsSubtarget::anchor() { }
-MipsSubtarget::MipsSubtarget(const TargetMachine &TM, const Module &M,
- const std::string &FS, bool little) :
- MipsArchVersion(Mips1), MipsABI(O32), IsLittle(little), IsSingleFloat(false),
- IsFP64bit(false), IsGP64bit(false), HasVFPU(false), HasSEInReg(false),
- HasABICall(true), HasAbsoluteCall(false), IsLinux(true)
+MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
+ const std::string &FS, bool little,
+ Reloc::Model _RM, MipsTargetMachine *_TM) :
+ MipsGenSubtargetInfo(TT, CPU, FS),
+ MipsArchVersion(Mips32), MipsABI(UnknownABI), IsLittle(little),
+ IsSingleFloat(false), IsFP64bit(false), IsGP64bit(false), HasVFPU(false),
+ IsLinux(true), HasSEInReg(false), HasCondMov(false), HasSwap(false),
+ HasBitCount(false), HasFPIdx(false),
+ InMips16Mode(false), InMips16HardFloat(Mips16HardFloat),
+ InMicroMipsMode(false), HasDSP(false), HasDSPR2(false),
+ AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16), HasMSA(false),
+ RM(_RM), OverrideMode(NoOverride), TM(_TM)
{
- std::string CPU = "mips1";
+ std::string CPUName = CPU;
+ if (CPUName.empty())
+ CPUName = "mips32";
// Parse features string.
- ParseSubtargetFeatures(FS, CPU);
- const std::string& TT = M.getTargetTriple();
+ ParseSubtargetFeatures(CPUName, FS);
+
+ PreviousInMips16Mode = InMips16Mode;
+
+ // Initialize scheduling itinerary for the specified CPU.
+ InstrItins = getInstrItineraryForCPU(CPUName);
+
+ // Set MipsABI if it hasn't been set yet.
+ if (MipsABI == UnknownABI)
+ MipsABI = hasMips64() ? N64 : O32;
+
+ // Check if Architecture and ABI are compatible.
+ assert(((!hasMips64() && (isABI_O32() || isABI_EABI())) ||
+ (hasMips64() && (isABI_N32() || isABI_N64()))) &&
+ "Invalid Arch & ABI pair.");
+
+ if (hasMSA() && !isFP64bit())
+ report_fatal_error("MSA requires a 64-bit FPU register file (FR=1 mode). "
+ "See -mattr=+fp64.",
+ false);
// Is the target system Linux ?
if (TT.find("linux") == std::string::npos)
IsLinux = false;
- // When only the target triple is specified and is
- // a allegrex target, set the features. We also match
- // big and little endian allegrex cores (dont really
- // know if a big one exists)
- if (TT.find("mipsallegrex") != std::string::npos) {
- MipsABI = EABI;
- IsSingleFloat = true;
- MipsArchVersion = Mips2;
- HasVFPU = true; // Enables Allegrex Vector FPU (not supported yet)
- HasSEInReg = true;
- }
+ // Set UseSmallSection.
+ UseSmallSection = !IsLinux && (RM == Reloc::Static);
+ // set some subtarget specific features
+ if (inMips16Mode())
+ HasBitCount=false;
+}
- // Abicall is the default for O32 ABI and is ignored
- // for EABI.
- if (NotABICall || isABI_EABI())
- HasABICall = false;
+bool
+MipsSubtarget::enablePostRAScheduler(CodeGenOpt::Level OptLevel,
+ TargetSubtargetInfo::AntiDepBreakMode &Mode,
+ RegClassVector &CriticalPathRCs) const {
+ Mode = TargetSubtargetInfo::ANTIDEP_NONE;
+ CriticalPathRCs.clear();
+ CriticalPathRCs.push_back(hasMips64() ?
+ &Mips::GPR64RegClass : &Mips::GPR32RegClass);
+ return OptLevel >= CodeGenOpt::Aggressive;
+}
+
+//FIXME: This logic for reseting the subtarget along with
+// the helper classes can probably be simplified but there are a lot of
+// cases so we will defer rewriting this to later.
+//
+void MipsSubtarget::resetSubtarget(MachineFunction *MF) {
+ bool ChangeToMips16 = false, ChangeToNoMips16 = false;
+ DEBUG(dbgs() << "resetSubtargetFeatures" << "\n");
+ AttributeSet FnAttrs = MF->getFunction()->getAttributes();
+ ChangeToMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
+ "mips16");
+ ChangeToNoMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
+ "nomips16");
+ assert (!(ChangeToMips16 & ChangeToNoMips16) &&
+ "mips16 and nomips16 specified on the same function");
+ if (ChangeToMips16) {
+ if (PreviousInMips16Mode)
+ return;
+ OverrideMode = Mips16Override;
+ PreviousInMips16Mode = true;
+ TM->setHelperClassesMips16();
+ return;
+ } else if (ChangeToNoMips16) {
+ if (!PreviousInMips16Mode)
+ return;
+ OverrideMode = NoMips16Override;
+ PreviousInMips16Mode = false;
+ TM->setHelperClassesMipsSE();
+ return;
+ } else {
+ if (OverrideMode == NoOverride)
+ return;
+ OverrideMode = NoOverride;
+ DEBUG(dbgs() << "back to default" << "\n");
+ if (inMips16Mode() && !PreviousInMips16Mode) {
+ TM->setHelperClassesMips16();
+ PreviousInMips16Mode = true;
+ } else if (!inMips16Mode() && PreviousInMips16Mode) {
+ TM->setHelperClassesMipsSE();
+ PreviousInMips16Mode = false;
+ }
+ return;
+ }
+}
- // TODO: disable when handling 64 bit symbols in the future.
- if (HasABICall && AbsoluteCall)
- HasAbsoluteCall = true;
+bool MipsSubtarget::mipsSEUsesSoftFloat() const {
+ return TM->Options.UseSoftFloat && !InMips16HardFloat;
}
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