[mips] Define two subclasses of MipsTargetLowering. Mips16TargetLowering is for
mips16 and MipsSETargetLowering is for mips32/64.
No functionality changes.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176917 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mips/Mips16ISelLowering.cpp b/lib/Target/Mips/Mips16ISelLowering.cpp
new file mode 100644
index 0000000..6de62cf
--- /dev/null
+++ b/lib/Target/Mips/Mips16ISelLowering.cpp
@@ -0,0 +1,681 @@
+//===-- Mips16ISelLowering.h - Mips16 DAG Lowering Interface ----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Subclass of MipsTargetLowering specialized for mips16.
+//
+//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "mips-lower"
+#include "Mips16ISelLowering.h"
+#include "MipsRegisterInfo.h"
+#include "MCTargetDesc/MipsBaseInfo.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Target/TargetInstrInfo.h"
+#include <set>
+
+using namespace llvm;
+
+static cl::opt<bool>
+Mips16HardFloat("mips16-hard-float", cl::NotHidden,
+ cl::desc("MIPS: mips16 hard float enable."),
+ cl::init(false));
+
+static cl::opt<bool> DontExpandCondPseudos16(
+ "mips16-dont-expand-cond-pseudo",
+ cl::init(false),
+ cl::desc("Dont expand conditional move related "
+ "pseudos for Mips 16"),
+ cl::Hidden);
+
+namespace {
+ std::set<const char*, MipsTargetLowering::LTStr> NoHelperNeeded;
+}
+
+Mips16TargetLowering::Mips16TargetLowering(MipsTargetMachine &TM)
+ : MipsTargetLowering(TM) {
+ // Set up the register classes
+ addRegisterClass(MVT::i32, &Mips::CPU16RegsRegClass);
+
+ if (Mips16HardFloat)
+ setMips16HardFloatLibCalls();
+
+ setOperationAction(ISD::MEMBARRIER, MVT::Other, Expand);
+ setOperationAction(ISD::ATOMIC_FENCE, MVT::Other, Expand);
+ setOperationAction(ISD::ATOMIC_CMP_SWAP, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_SWAP, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_ADD, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_SUB, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_AND, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_OR, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_XOR, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_NAND, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_MIN, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_MAX, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_UMIN, MVT::i32, Expand);
+ setOperationAction(ISD::ATOMIC_LOAD_UMAX, MVT::i32, Expand);
+
+ computeRegisterProperties();
+}
+
+const MipsTargetLowering *
+llvm::createMips16TargetLowering(MipsTargetMachine &TM) {
+ return new Mips16TargetLowering(TM);
+}
+
+bool
+Mips16TargetLowering::allowsUnalignedMemoryAccesses(EVT VT, bool *Fast) const {
+ return false;
+}
+
+MachineBasicBlock *
+Mips16TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
+ MachineBasicBlock *BB) const {
+ switch (MI->getOpcode()) {
+ default:
+ return MipsTargetLowering::EmitInstrWithCustomInserter(MI, BB);
+ case Mips::SelBeqZ:
+ return emitSel16(Mips::BeqzRxImm16, MI, BB);
+ case Mips::SelBneZ:
+ return emitSel16(Mips::BnezRxImm16, MI, BB);
+ case Mips::SelTBteqZCmpi:
+ return emitSeliT16(Mips::BteqzX16, Mips::CmpiRxImmX16, MI, BB);
+ case Mips::SelTBteqZSlti:
+ return emitSeliT16(Mips::BteqzX16, Mips::SltiRxImmX16, MI, BB);
+ case Mips::SelTBteqZSltiu:
+ return emitSeliT16(Mips::BteqzX16, Mips::SltiuRxImmX16, MI, BB);
+ case Mips::SelTBtneZCmpi:
+ return emitSeliT16(Mips::BtnezX16, Mips::CmpiRxImmX16, MI, BB);
+ case Mips::SelTBtneZSlti:
+ return emitSeliT16(Mips::BtnezX16, Mips::SltiRxImmX16, MI, BB);
+ case Mips::SelTBtneZSltiu:
+ return emitSeliT16(Mips::BtnezX16, Mips::SltiuRxImmX16, MI, BB);
+ case Mips::SelTBteqZCmp:
+ return emitSelT16(Mips::BteqzX16, Mips::CmpRxRy16, MI, BB);
+ case Mips::SelTBteqZSlt:
+ return emitSelT16(Mips::BteqzX16, Mips::SltRxRy16, MI, BB);
+ case Mips::SelTBteqZSltu:
+ return emitSelT16(Mips::BteqzX16, Mips::SltuRxRy16, MI, BB);
+ case Mips::SelTBtneZCmp:
+ return emitSelT16(Mips::BtnezX16, Mips::CmpRxRy16, MI, BB);
+ case Mips::SelTBtneZSlt:
+ return emitSelT16(Mips::BtnezX16, Mips::SltRxRy16, MI, BB);
+ case Mips::SelTBtneZSltu:
+ return emitSelT16(Mips::BtnezX16, Mips::SltuRxRy16, MI, BB);
+ case Mips::BteqzT8CmpX16:
+ return emitFEXT_T8I816_ins(Mips::BteqzX16, Mips::CmpRxRy16, MI, BB);
+ case Mips::BteqzT8SltX16:
+ return emitFEXT_T8I816_ins(Mips::BteqzX16, Mips::SltRxRy16, MI, BB);
+ case Mips::BteqzT8SltuX16:
+ // TBD: figure out a way to get this or remove the instruction
+ // altogether.
+ return emitFEXT_T8I816_ins(Mips::BteqzX16, Mips::SltuRxRy16, MI, BB);
+ case Mips::BtnezT8CmpX16:
+ return emitFEXT_T8I816_ins(Mips::BtnezX16, Mips::CmpRxRy16, MI, BB);
+ case Mips::BtnezT8SltX16:
+ return emitFEXT_T8I816_ins(Mips::BtnezX16, Mips::SltRxRy16, MI, BB);
+ case Mips::BtnezT8SltuX16:
+ // TBD: figure out a way to get this or remove the instruction
+ // altogether.
+ return emitFEXT_T8I816_ins(Mips::BtnezX16, Mips::SltuRxRy16, MI, BB);
+ case Mips::BteqzT8CmpiX16: return emitFEXT_T8I8I16_ins(
+ Mips::BteqzX16, Mips::CmpiRxImm16, Mips::CmpiRxImmX16, MI, BB);
+ case Mips::BteqzT8SltiX16: return emitFEXT_T8I8I16_ins(
+ Mips::BteqzX16, Mips::SltiRxImm16, Mips::SltiRxImmX16, MI, BB);
+ case Mips::BteqzT8SltiuX16: return emitFEXT_T8I8I16_ins(
+ Mips::BteqzX16, Mips::SltiuRxImm16, Mips::SltiuRxImmX16, MI, BB);
+ case Mips::BtnezT8CmpiX16: return emitFEXT_T8I8I16_ins(
+ Mips::BtnezX16, Mips::CmpiRxImm16, Mips::CmpiRxImmX16, MI, BB);
+ case Mips::BtnezT8SltiX16: return emitFEXT_T8I8I16_ins(
+ Mips::BtnezX16, Mips::SltiRxImm16, Mips::SltiRxImmX16, MI, BB);
+ case Mips::BtnezT8SltiuX16: return emitFEXT_T8I8I16_ins(
+ Mips::BtnezX16, Mips::SltiuRxImm16, Mips::SltiuRxImmX16, MI, BB);
+ break;
+ case Mips::SltCCRxRy16:
+ return emitFEXT_CCRX16_ins(Mips::SltRxRy16, MI, BB);
+ break;
+ case Mips::SltiCCRxImmX16:
+ return emitFEXT_CCRXI16_ins
+ (Mips::SltiRxImm16, Mips::SltiRxImmX16, MI, BB);
+ case Mips::SltiuCCRxImmX16:
+ return emitFEXT_CCRXI16_ins
+ (Mips::SltiuRxImm16, Mips::SltiuRxImmX16, MI, BB);
+ case Mips::SltuCCRxRy16:
+ return emitFEXT_CCRX16_ins
+ (Mips::SltuRxRy16, MI, BB);
+ }
+}
+
+bool Mips16TargetLowering::
+isEligibleForTailCallOptimization(const MipsCC &MipsCCInfo,
+ unsigned NextStackOffset,
+ const MipsFunctionInfo& FI) const {
+ // No tail call optimization for mips16.
+ return false;
+}
+
+void Mips16TargetLowering::setMips16LibcallName
+ (RTLIB::Libcall L, const char *Name) {
+ setLibcallName(L, Name);
+ NoHelperNeeded.insert(Name);
+}
+
+void Mips16TargetLowering::setMips16HardFloatLibCalls() {
+ setMips16LibcallName(RTLIB::ADD_F32, "__mips16_addsf3");
+ setMips16LibcallName(RTLIB::ADD_F64, "__mips16_adddf3");
+ setMips16LibcallName(RTLIB::SUB_F32, "__mips16_subsf3");
+ setMips16LibcallName(RTLIB::SUB_F64, "__mips16_subdf3");
+ setMips16LibcallName(RTLIB::MUL_F32, "__mips16_mulsf3");
+ setMips16LibcallName(RTLIB::MUL_F64, "__mips16_muldf3");
+ setMips16LibcallName(RTLIB::DIV_F32, "__mips16_divsf3");
+ setMips16LibcallName(RTLIB::DIV_F64, "__mips16_divdf3");
+ setMips16LibcallName(RTLIB::FPEXT_F32_F64, "__mips16_extendsfdf2");
+ setMips16LibcallName(RTLIB::FPROUND_F64_F32, "__mips16_truncdfsf2");
+ setMips16LibcallName(RTLIB::FPTOSINT_F32_I32, "__mips16_fix_truncsfsi");
+ setMips16LibcallName(RTLIB::FPTOSINT_F64_I32, "__mips16_fix_truncdfsi");
+ setMips16LibcallName(RTLIB::SINTTOFP_I32_F32, "__mips16_floatsisf");
+ setMips16LibcallName(RTLIB::SINTTOFP_I32_F64, "__mips16_floatsidf");
+ setMips16LibcallName(RTLIB::UINTTOFP_I32_F32, "__mips16_floatunsisf");
+ setMips16LibcallName(RTLIB::UINTTOFP_I32_F64, "__mips16_floatunsidf");
+ setMips16LibcallName(RTLIB::OEQ_F32, "__mips16_eqsf2");
+ setMips16LibcallName(RTLIB::OEQ_F64, "__mips16_eqdf2");
+ setMips16LibcallName(RTLIB::UNE_F32, "__mips16_nesf2");
+ setMips16LibcallName(RTLIB::UNE_F64, "__mips16_nedf2");
+ setMips16LibcallName(RTLIB::OGE_F32, "__mips16_gesf2");
+ setMips16LibcallName(RTLIB::OGE_F64, "__mips16_gedf2");
+ setMips16LibcallName(RTLIB::OLT_F32, "__mips16_ltsf2");
+ setMips16LibcallName(RTLIB::OLT_F64, "__mips16_ltdf2");
+ setMips16LibcallName(RTLIB::OLE_F32, "__mips16_lesf2");
+ setMips16LibcallName(RTLIB::OLE_F64, "__mips16_ledf2");
+ setMips16LibcallName(RTLIB::OGT_F32, "__mips16_gtsf2");
+ setMips16LibcallName(RTLIB::OGT_F64, "__mips16_gtdf2");
+ setMips16LibcallName(RTLIB::UO_F32, "__mips16_unordsf2");
+ setMips16LibcallName(RTLIB::UO_F64, "__mips16_unorddf2");
+ setMips16LibcallName(RTLIB::O_F32, "__mips16_unordsf2");
+ setMips16LibcallName(RTLIB::O_F64, "__mips16_unorddf2");
+}
+
+
+//
+// The Mips16 hard float is a crazy quilt inherited from gcc. I have a much
+// cleaner way to do all of this but it will have to wait until the traditional
+// gcc mechanism is completed.
+//
+// For Pic, in order for Mips16 code to call Mips32 code which according the abi
+// have either arguments or returned values placed in floating point registers,
+// we use a set of helper functions. (This includes functions which return type
+// complex which on Mips are returned in a pair of floating point registers).
+//
+// This is an encoding that we inherited from gcc.
+// In Mips traditional O32, N32 ABI, floating point numbers are passed in
+// floating point argument registers 1,2 only when the first and optionally
+// the second arguments are float (sf) or double (df).
+// For Mips16 we are only concerned with the situations where floating point
+// arguments are being passed in floating point registers by the ABI, because
+// Mips16 mode code cannot execute floating point instructions to load those
+// values and hence helper functions are needed.
+// The possibilities are (), (sf), (sf, sf), (sf, df), (df), (df, sf), (df, df)
+// the helper function suffixs for these are:
+// 0, 1, 5, 9, 2, 6, 10
+// this suffix can then be calculated as follows:
+// for a given argument Arg:
+// Arg1x, Arg2x = 1 : Arg is sf
+// 2 : Arg is df
+// 0: Arg is neither sf or df
+// So this stub is the string for number Arg1x + Arg2x*4.
+// However not all numbers between 0 and 10 are possible, we check anyway and
+// assert if the impossible exists.
+//
+
+unsigned int Mips16TargetLowering::getMips16HelperFunctionStubNumber
+ (ArgListTy &Args) const {
+ unsigned int resultNum = 0;
+ if (Args.size() >= 1) {
+ Type *t = Args[0].Ty;
+ if (t->isFloatTy()) {
+ resultNum = 1;
+ }
+ else if (t->isDoubleTy()) {
+ resultNum = 2;
+ }
+ }
+ if (resultNum) {
+ if (Args.size() >=2) {
+ Type *t = Args[1].Ty;
+ if (t->isFloatTy()) {
+ resultNum += 4;
+ }
+ else if (t->isDoubleTy()) {
+ resultNum += 8;
+ }
+ }
+ }
+ return resultNum;
+}
+
+//
+// prefixs are attached to stub numbers depending on the return type .
+// return type: float sf_
+// double df_
+// single complex sc_
+// double complext dc_
+// others NO PREFIX
+//
+//
+// The full name of a helper function is__mips16_call_stub +
+// return type dependent prefix + stub number
+//
+//
+// This is something that probably should be in a different source file and
+// perhaps done differently but my main purpose is to not waste runtime
+// on something that we can enumerate in the source. Another possibility is
+// to have a python script to generate these mapping tables. This will do
+// for now. There are a whole series of helper function mapping arrays, one
+// for each return type class as outlined above. There there are 11 possible
+// entries. Ones with 0 are ones which should never be selected
+//
+// All the arrays are similar except for ones which return neither
+// sf, df, sc, dc, in which only care about ones which have sf or df as a
+// first parameter.
+//
+#define P_ "__mips16_call_stub_"
+#define MAX_STUB_NUMBER 10
+#define T1 P "1", P "2", 0, 0, P "5", P "6", 0, 0, P "9", P "10"
+#define T P "0" , T1
+#define P P_
+static char const * vMips16Helper[MAX_STUB_NUMBER+1] =
+ {0, T1 };
+#undef P
+#define P P_ "sf_"
+static char const * sfMips16Helper[MAX_STUB_NUMBER+1] =
+ { T };
+#undef P
+#define P P_ "df_"
+static char const * dfMips16Helper[MAX_STUB_NUMBER+1] =
+ { T };
+#undef P
+#define P P_ "sc_"
+static char const * scMips16Helper[MAX_STUB_NUMBER+1] =
+ { T };
+#undef P
+#define P P_ "dc_"
+static char const * dcMips16Helper[MAX_STUB_NUMBER+1] =
+ { T };
+#undef P
+#undef P_
+
+
+const char* Mips16TargetLowering::
+ getMips16HelperFunction
+ (Type* RetTy, ArgListTy &Args, bool &needHelper) const {
+ const unsigned int stubNum = getMips16HelperFunctionStubNumber(Args);
+#ifndef NDEBUG
+ const unsigned int maxStubNum = 10;
+ assert(stubNum <= maxStubNum);
+ const bool validStubNum[maxStubNum+1] =
+ {true, true, true, false, false, true, true, false, false, true, true};
+ assert(validStubNum[stubNum]);
+#endif
+ const char *result;
+ if (RetTy->isFloatTy()) {
+ result = sfMips16Helper[stubNum];
+ }
+ else if (RetTy ->isDoubleTy()) {
+ result = dfMips16Helper[stubNum];
+ }
+ else if (RetTy->isStructTy()) {
+ // check if it's complex
+ if (RetTy->getNumContainedTypes() == 2) {
+ if ((RetTy->getContainedType(0)->isFloatTy()) &&
+ (RetTy->getContainedType(1)->isFloatTy())) {
+ result = scMips16Helper[stubNum];
+ }
+ else if ((RetTy->getContainedType(0)->isDoubleTy()) &&
+ (RetTy->getContainedType(1)->isDoubleTy())) {
+ result = dcMips16Helper[stubNum];
+ }
+ else {
+ llvm_unreachable("Uncovered condition");
+ }
+ }
+ else {
+ llvm_unreachable("Uncovered condition");
+ }
+ }
+ else {
+ if (stubNum == 0) {
+ needHelper = false;
+ return "";
+ }
+ result = vMips16Helper[stubNum];
+ }
+ needHelper = true;
+ return result;
+}
+
+void Mips16TargetLowering::
+getOpndList(SmallVectorImpl<SDValue> &Ops,
+ std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
+ bool IsPICCall, bool GlobalOrExternal, bool InternalLinkage,
+ CallLoweringInfo &CLI, SDValue Callee, SDValue Chain) const {
+ SelectionDAG &DAG = CLI.DAG;
+ const char* Mips16HelperFunction = 0;
+ bool NeedMips16Helper = false;
+
+ if (getTargetMachine().Options.UseSoftFloat && Mips16HardFloat) {
+ //
+ // currently we don't have symbols tagged with the mips16 or mips32
+ // qualifier so we will assume that we don't know what kind it is.
+ // and generate the helper
+ //
+ bool LookupHelper = true;
+ if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(CLI.Callee)) {
+ if (NoHelperNeeded.find(S->getSymbol()) != NoHelperNeeded.end()) {
+ LookupHelper = false;
+ }
+ }
+ if (LookupHelper) Mips16HelperFunction =
+ getMips16HelperFunction(CLI.RetTy, CLI.Args, NeedMips16Helper);
+
+ }
+
+ SDValue JumpTarget = Callee;
+
+ // T9 should contain the address of the callee function if
+ // -reloction-model=pic or it is an indirect call.
+ if (IsPICCall || !GlobalOrExternal) {
+ unsigned V0Reg = Mips::V0;
+ if (NeedMips16Helper) {
+ RegsToPass.push_front(std::make_pair(V0Reg, Callee));
+ JumpTarget = DAG.getExternalSymbol(Mips16HelperFunction, getPointerTy());
+ JumpTarget = getAddrGlobal(JumpTarget, DAG, MipsII::MO_GOT);
+ } else
+ RegsToPass.push_front(std::make_pair((unsigned)Mips::T9, Callee));
+ }
+
+ Ops.push_back(JumpTarget);
+
+ MipsTargetLowering::getOpndList(Ops, RegsToPass, IsPICCall, GlobalOrExternal,
+ InternalLinkage, CLI, Callee, Chain);
+}
+
+MachineBasicBlock *Mips16TargetLowering::
+emitSel16(unsigned Opc, MachineInstr *MI, MachineBasicBlock *BB) const {
+ if (DontExpandCondPseudos16)
+ return BB;
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ DebugLoc DL = MI->getDebugLoc();
+ // To "insert" a SELECT_CC instruction, we actually have to insert the
+ // diamond control-flow pattern. The incoming instruction knows the
+ // destination vreg to set, the condition code register to branch on, the
+ // true/false values to select between, and a branch opcode to use.
+ const BasicBlock *LLVM_BB = BB->getBasicBlock();
+ MachineFunction::iterator It = BB;
+ ++It;
+
+ // thisMBB:
+ // ...
+ // TrueVal = ...
+ // setcc r1, r2, r3
+ // bNE r1, r0, copy1MBB
+ // fallthrough --> copy0MBB
+ MachineBasicBlock *thisMBB = BB;
+ MachineFunction *F = BB->getParent();
+ MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
+ F->insert(It, copy0MBB);
+ F->insert(It, sinkMBB);
+
+ // Transfer the remainder of BB and its successor edges to sinkMBB.
+ sinkMBB->splice(sinkMBB->begin(), BB,
+ llvm::next(MachineBasicBlock::iterator(MI)),
+ BB->end());
+ sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+ // Next, add the true and fallthrough blocks as its successors.
+ BB->addSuccessor(copy0MBB);
+ BB->addSuccessor(sinkMBB);
+
+ BuildMI(BB, DL, TII->get(Opc)).addReg(MI->getOperand(3).getReg())
+ .addMBB(sinkMBB);
+
+ // copy0MBB:
+ // %FalseValue = ...
+ // # fallthrough to sinkMBB
+ BB = copy0MBB;
+
+ // Update machine-CFG edges
+ BB->addSuccessor(sinkMBB);
+
+ // sinkMBB:
+ // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
+ // ...
+ BB = sinkMBB;
+
+ BuildMI(*BB, BB->begin(), DL,
+ TII->get(Mips::PHI), MI->getOperand(0).getReg())
+ .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB)
+ .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB);
+
+ MI->eraseFromParent(); // The pseudo instruction is gone now.
+ return BB;
+}
+
+MachineBasicBlock *Mips16TargetLowering::emitSelT16
+ (unsigned Opc1, unsigned Opc2,
+ MachineInstr *MI, MachineBasicBlock *BB) const {
+ if (DontExpandCondPseudos16)
+ return BB;
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ DebugLoc DL = MI->getDebugLoc();
+ // To "insert" a SELECT_CC instruction, we actually have to insert the
+ // diamond control-flow pattern. The incoming instruction knows the
+ // destination vreg to set, the condition code register to branch on, the
+ // true/false values to select between, and a branch opcode to use.
+ const BasicBlock *LLVM_BB = BB->getBasicBlock();
+ MachineFunction::iterator It = BB;
+ ++It;
+
+ // thisMBB:
+ // ...
+ // TrueVal = ...
+ // setcc r1, r2, r3
+ // bNE r1, r0, copy1MBB
+ // fallthrough --> copy0MBB
+ MachineBasicBlock *thisMBB = BB;
+ MachineFunction *F = BB->getParent();
+ MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
+ F->insert(It, copy0MBB);
+ F->insert(It, sinkMBB);
+
+ // Transfer the remainder of BB and its successor edges to sinkMBB.
+ sinkMBB->splice(sinkMBB->begin(), BB,
+ llvm::next(MachineBasicBlock::iterator(MI)),
+ BB->end());
+ sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+ // Next, add the true and fallthrough blocks as its successors.
+ BB->addSuccessor(copy0MBB);
+ BB->addSuccessor(sinkMBB);
+
+ BuildMI(BB, DL, TII->get(Opc2)).addReg(MI->getOperand(3).getReg())
+ .addReg(MI->getOperand(4).getReg());
+ BuildMI(BB, DL, TII->get(Opc1)).addMBB(sinkMBB);
+
+ // copy0MBB:
+ // %FalseValue = ...
+ // # fallthrough to sinkMBB
+ BB = copy0MBB;
+
+ // Update machine-CFG edges
+ BB->addSuccessor(sinkMBB);
+
+ // sinkMBB:
+ // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
+ // ...
+ BB = sinkMBB;
+
+ BuildMI(*BB, BB->begin(), DL,
+ TII->get(Mips::PHI), MI->getOperand(0).getReg())
+ .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB)
+ .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB);
+
+ MI->eraseFromParent(); // The pseudo instruction is gone now.
+ return BB;
+
+}
+
+MachineBasicBlock *Mips16TargetLowering::emitSeliT16
+ (unsigned Opc1, unsigned Opc2,
+ MachineInstr *MI, MachineBasicBlock *BB) const {
+ if (DontExpandCondPseudos16)
+ return BB;
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ DebugLoc DL = MI->getDebugLoc();
+ // To "insert" a SELECT_CC instruction, we actually have to insert the
+ // diamond control-flow pattern. The incoming instruction knows the
+ // destination vreg to set, the condition code register to branch on, the
+ // true/false values to select between, and a branch opcode to use.
+ const BasicBlock *LLVM_BB = BB->getBasicBlock();
+ MachineFunction::iterator It = BB;
+ ++It;
+
+ // thisMBB:
+ // ...
+ // TrueVal = ...
+ // setcc r1, r2, r3
+ // bNE r1, r0, copy1MBB
+ // fallthrough --> copy0MBB
+ MachineBasicBlock *thisMBB = BB;
+ MachineFunction *F = BB->getParent();
+ MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
+ MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
+ F->insert(It, copy0MBB);
+ F->insert(It, sinkMBB);
+
+ // Transfer the remainder of BB and its successor edges to sinkMBB.
+ sinkMBB->splice(sinkMBB->begin(), BB,
+ llvm::next(MachineBasicBlock::iterator(MI)),
+ BB->end());
+ sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
+
+ // Next, add the true and fallthrough blocks as its successors.
+ BB->addSuccessor(copy0MBB);
+ BB->addSuccessor(sinkMBB);
+
+ BuildMI(BB, DL, TII->get(Opc2)).addReg(MI->getOperand(3).getReg())
+ .addImm(MI->getOperand(4).getImm());
+ BuildMI(BB, DL, TII->get(Opc1)).addMBB(sinkMBB);
+
+ // copy0MBB:
+ // %FalseValue = ...
+ // # fallthrough to sinkMBB
+ BB = copy0MBB;
+
+ // Update machine-CFG edges
+ BB->addSuccessor(sinkMBB);
+
+ // sinkMBB:
+ // %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
+ // ...
+ BB = sinkMBB;
+
+ BuildMI(*BB, BB->begin(), DL,
+ TII->get(Mips::PHI), MI->getOperand(0).getReg())
+ .addReg(MI->getOperand(1).getReg()).addMBB(thisMBB)
+ .addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB);
+
+ MI->eraseFromParent(); // The pseudo instruction is gone now.
+ return BB;
+
+}
+
+MachineBasicBlock
+ *Mips16TargetLowering::emitFEXT_T8I816_ins(unsigned BtOpc, unsigned CmpOpc,
+ MachineInstr *MI,
+ MachineBasicBlock *BB) const {
+ if (DontExpandCondPseudos16)
+ return BB;
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ unsigned regX = MI->getOperand(0).getReg();
+ unsigned regY = MI->getOperand(1).getReg();
+ MachineBasicBlock *target = MI->getOperand(2).getMBB();
+ BuildMI(*BB, MI, MI->getDebugLoc(), TII->get(CmpOpc)).addReg(regX).addReg(regY);
+ BuildMI(*BB, MI, MI->getDebugLoc(), TII->get(BtOpc)).addMBB(target);
+ MI->eraseFromParent(); // The pseudo instruction is gone now.
+ return BB;
+}
+
+MachineBasicBlock *Mips16TargetLowering::emitFEXT_T8I8I16_ins(
+ unsigned BtOpc, unsigned CmpiOpc, unsigned CmpiXOpc,
+ MachineInstr *MI, MachineBasicBlock *BB) const {
+ if (DontExpandCondPseudos16)
+ return BB;
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ unsigned regX = MI->getOperand(0).getReg();
+ int64_t imm = MI->getOperand(1).getImm();
+ MachineBasicBlock *target = MI->getOperand(2).getMBB();
+ unsigned CmpOpc;
+ if (isUInt<8>(imm))
+ CmpOpc = CmpiOpc;
+ else if (isUInt<16>(imm))
+ CmpOpc = CmpiXOpc;
+ else
+ llvm_unreachable("immediate field not usable");
+ BuildMI(*BB, MI, MI->getDebugLoc(), TII->get(CmpOpc)).addReg(regX).addImm(imm);
+ BuildMI(*BB, MI, MI->getDebugLoc(), TII->get(BtOpc)).addMBB(target);
+ MI->eraseFromParent(); // The pseudo instruction is gone now.
+ return BB;
+}
+
+static unsigned Mips16WhichOp8uOr16simm
+ (unsigned shortOp, unsigned longOp, int64_t Imm) {
+ if (isUInt<8>(Imm))
+ return shortOp;
+ else if (isInt<16>(Imm))
+ return longOp;
+ else
+ llvm_unreachable("immediate field not usable");
+}
+
+MachineBasicBlock *Mips16TargetLowering::emitFEXT_CCRX16_ins(
+ unsigned SltOpc,
+ MachineInstr *MI, MachineBasicBlock *BB) const {
+ if (DontExpandCondPseudos16)
+ return BB;
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ unsigned CC = MI->getOperand(0).getReg();
+ unsigned regX = MI->getOperand(1).getReg();
+ unsigned regY = MI->getOperand(2).getReg();
+ BuildMI(*BB, MI, MI->getDebugLoc(),
+ TII->get(SltOpc)).addReg(regX).addReg(regY);
+ BuildMI(*BB, MI, MI->getDebugLoc(),
+ TII->get(Mips::MoveR3216), CC).addReg(Mips::T8);
+ MI->eraseFromParent(); // The pseudo instruction is gone now.
+ return BB;
+}
+
+MachineBasicBlock *Mips16TargetLowering::emitFEXT_CCRXI16_ins(
+ unsigned SltiOpc, unsigned SltiXOpc,
+ MachineInstr *MI, MachineBasicBlock *BB )const {
+ if (DontExpandCondPseudos16)
+ return BB;
+ const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
+ unsigned CC = MI->getOperand(0).getReg();
+ unsigned regX = MI->getOperand(1).getReg();
+ int64_t Imm = MI->getOperand(2).getImm();
+ unsigned SltOpc = Mips16WhichOp8uOr16simm(SltiOpc, SltiXOpc, Imm);
+ BuildMI(*BB, MI, MI->getDebugLoc(),
+ TII->get(SltOpc)).addReg(regX).addImm(Imm);
+ BuildMI(*BB, MI, MI->getDebugLoc(),
+ TII->get(Mips::MoveR3216), CC).addReg(Mips::T8);
+ MI->eraseFromParent(); // The pseudo instruction is gone now.
+ return BB;
+
+}