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Diffstat (limited to 'contrib/llvm-project/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp')
| -rw-r--r-- | contrib/llvm-project/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp | 1622 |
1 files changed, 1622 insertions, 0 deletions
diff --git a/contrib/llvm-project/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp b/contrib/llvm-project/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp new file mode 100644 index 000000000000..821339f50355 --- /dev/null +++ b/contrib/llvm-project/llvm/lib/Target/MSP430/MSP430ISelLowering.cpp @@ -0,0 +1,1622 @@ +//===-- MSP430ISelLowering.cpp - MSP430 DAG Lowering Implementation ------===// +// +// 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 MSP430TargetLowering class. +// +//===----------------------------------------------------------------------===// + +#include "MSP430ISelLowering.h" +#include "MSP430.h" +#include "MSP430MachineFunctionInfo.h" +#include "MSP430Subtarget.h" +#include "MSP430TargetMachine.h" +#include "llvm/CodeGen/CallingConvLower.h" +#include "llvm/CodeGen/MachineFrameInfo.h" +#include "llvm/CodeGen/MachineFunction.h" +#include "llvm/CodeGen/MachineInstrBuilder.h" +#include "llvm/CodeGen/MachineRegisterInfo.h" +#include "llvm/CodeGen/SelectionDAGISel.h" +#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h" +#include "llvm/CodeGen/ValueTypes.h" +#include "llvm/IR/CallingConv.h" +#include "llvm/IR/DerivedTypes.h" +#include "llvm/IR/Function.h" +#include "llvm/IR/GlobalAlias.h" +#include "llvm/IR/GlobalVariable.h" +#include "llvm/IR/Intrinsics.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/raw_ostream.h" +using namespace llvm; + +#define DEBUG_TYPE "msp430-lower" + +static cl::opt<bool>MSP430NoLegalImmediate( + "msp430-no-legal-immediate", cl::Hidden, + cl::desc("Enable non legal immediates (for testing purposes only)"), + cl::init(false)); + +MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM, + const MSP430Subtarget &STI) + : TargetLowering(TM) { + + // Set up the register classes. + addRegisterClass(MVT::i8, &MSP430::GR8RegClass); + addRegisterClass(MVT::i16, &MSP430::GR16RegClass); + + // Compute derived properties from the register classes + computeRegisterProperties(STI.getRegisterInfo()); + + // Provide all sorts of operation actions + setStackPointerRegisterToSaveRestore(MSP430::SP); + setBooleanContents(ZeroOrOneBooleanContent); + setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct? + + // We have post-incremented loads / stores. + setIndexedLoadAction(ISD::POST_INC, MVT::i8, Legal); + setIndexedLoadAction(ISD::POST_INC, MVT::i16, Legal); + + for (MVT VT : MVT::integer_valuetypes()) { + setLoadExtAction(ISD::EXTLOAD, VT, MVT::i1, Promote); + setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote); + setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i1, Promote); + setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i8, Expand); + setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i16, Expand); + } + + // We don't have any truncstores + setTruncStoreAction(MVT::i16, MVT::i8, Expand); + + setOperationAction(ISD::SRA, MVT::i8, Custom); + setOperationAction(ISD::SHL, MVT::i8, Custom); + setOperationAction(ISD::SRL, MVT::i8, Custom); + setOperationAction(ISD::SRA, MVT::i16, Custom); + setOperationAction(ISD::SHL, MVT::i16, Custom); + setOperationAction(ISD::SRL, MVT::i16, Custom); + setOperationAction(ISD::ROTL, MVT::i8, Expand); + setOperationAction(ISD::ROTR, MVT::i8, Expand); + setOperationAction(ISD::ROTL, MVT::i16, Expand); + setOperationAction(ISD::ROTR, MVT::i16, Expand); + setOperationAction(ISD::GlobalAddress, MVT::i16, Custom); + setOperationAction(ISD::ExternalSymbol, MVT::i16, Custom); + setOperationAction(ISD::BlockAddress, MVT::i16, Custom); + setOperationAction(ISD::BR_JT, MVT::Other, Expand); + setOperationAction(ISD::BR_CC, MVT::i8, Custom); + setOperationAction(ISD::BR_CC, MVT::i16, Custom); + setOperationAction(ISD::BRCOND, MVT::Other, Expand); + setOperationAction(ISD::SETCC, MVT::i8, Custom); + setOperationAction(ISD::SETCC, MVT::i16, Custom); + setOperationAction(ISD::SELECT, MVT::i8, Expand); + setOperationAction(ISD::SELECT, MVT::i16, Expand); + setOperationAction(ISD::SELECT_CC, MVT::i8, Custom); + setOperationAction(ISD::SELECT_CC, MVT::i16, Custom); + setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Custom); + setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i8, Expand); + setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i16, Expand); + setOperationAction(ISD::STACKSAVE, MVT::Other, Expand); + setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand); + + setOperationAction(ISD::CTTZ, MVT::i8, Expand); + setOperationAction(ISD::CTTZ, MVT::i16, Expand); + setOperationAction(ISD::CTLZ, MVT::i8, Expand); + setOperationAction(ISD::CTLZ, MVT::i16, Expand); + setOperationAction(ISD::CTPOP, MVT::i8, Expand); + setOperationAction(ISD::CTPOP, MVT::i16, Expand); + + setOperationAction(ISD::SHL_PARTS, MVT::i8, Expand); + setOperationAction(ISD::SHL_PARTS, MVT::i16, Expand); + setOperationAction(ISD::SRL_PARTS, MVT::i8, Expand); + setOperationAction(ISD::SRL_PARTS, MVT::i16, Expand); + setOperationAction(ISD::SRA_PARTS, MVT::i8, Expand); + setOperationAction(ISD::SRA_PARTS, MVT::i16, Expand); + + setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand); + + // FIXME: Implement efficiently multiplication by a constant + setOperationAction(ISD::MUL, MVT::i8, Promote); + setOperationAction(ISD::MULHS, MVT::i8, Promote); + setOperationAction(ISD::MULHU, MVT::i8, Promote); + setOperationAction(ISD::SMUL_LOHI, MVT::i8, Promote); + setOperationAction(ISD::UMUL_LOHI, MVT::i8, Promote); + setOperationAction(ISD::MUL, MVT::i16, LibCall); + setOperationAction(ISD::MULHS, MVT::i16, Expand); + setOperationAction(ISD::MULHU, MVT::i16, Expand); + setOperationAction(ISD::SMUL_LOHI, MVT::i16, Expand); + setOperationAction(ISD::UMUL_LOHI, MVT::i16, Expand); + + setOperationAction(ISD::UDIV, MVT::i8, Promote); + setOperationAction(ISD::UDIVREM, MVT::i8, Promote); + setOperationAction(ISD::UREM, MVT::i8, Promote); + setOperationAction(ISD::SDIV, MVT::i8, Promote); + setOperationAction(ISD::SDIVREM, MVT::i8, Promote); + setOperationAction(ISD::SREM, MVT::i8, Promote); + setOperationAction(ISD::UDIV, MVT::i16, LibCall); + setOperationAction(ISD::UDIVREM, MVT::i16, Expand); + setOperationAction(ISD::UREM, MVT::i16, LibCall); + setOperationAction(ISD::SDIV, MVT::i16, LibCall); + setOperationAction(ISD::SDIVREM, MVT::i16, Expand); + setOperationAction(ISD::SREM, MVT::i16, LibCall); + + // varargs support + setOperationAction(ISD::VASTART, MVT::Other, Custom); + setOperationAction(ISD::VAARG, MVT::Other, Expand); + setOperationAction(ISD::VAEND, MVT::Other, Expand); + setOperationAction(ISD::VACOPY, MVT::Other, Expand); + setOperationAction(ISD::JumpTable, MVT::i16, Custom); + + // EABI Libcalls - EABI Section 6.2 + const struct { + const RTLIB::Libcall Op; + const char * const Name; + const ISD::CondCode Cond; + } LibraryCalls[] = { + // Floating point conversions - EABI Table 6 + { RTLIB::FPROUND_F64_F32, "__mspabi_cvtdf", ISD::SETCC_INVALID }, + { RTLIB::FPEXT_F32_F64, "__mspabi_cvtfd", ISD::SETCC_INVALID }, + // The following is NOT implemented in libgcc + //{ RTLIB::FPTOSINT_F64_I16, "__mspabi_fixdi", ISD::SETCC_INVALID }, + { RTLIB::FPTOSINT_F64_I32, "__mspabi_fixdli", ISD::SETCC_INVALID }, + { RTLIB::FPTOSINT_F64_I64, "__mspabi_fixdlli", ISD::SETCC_INVALID }, + // The following is NOT implemented in libgcc + //{ RTLIB::FPTOUINT_F64_I16, "__mspabi_fixdu", ISD::SETCC_INVALID }, + { RTLIB::FPTOUINT_F64_I32, "__mspabi_fixdul", ISD::SETCC_INVALID }, + { RTLIB::FPTOUINT_F64_I64, "__mspabi_fixdull", ISD::SETCC_INVALID }, + // The following is NOT implemented in libgcc + //{ RTLIB::FPTOSINT_F32_I16, "__mspabi_fixfi", ISD::SETCC_INVALID }, + { RTLIB::FPTOSINT_F32_I32, "__mspabi_fixfli", ISD::SETCC_INVALID }, + { RTLIB::FPTOSINT_F32_I64, "__mspabi_fixflli", ISD::SETCC_INVALID }, + // The following is NOT implemented in libgcc + //{ RTLIB::FPTOUINT_F32_I16, "__mspabi_fixfu", ISD::SETCC_INVALID }, + { RTLIB::FPTOUINT_F32_I32, "__mspabi_fixful", ISD::SETCC_INVALID }, + { RTLIB::FPTOUINT_F32_I64, "__mspabi_fixfull", ISD::SETCC_INVALID }, + // TODO The following IS implemented in libgcc + //{ RTLIB::SINTTOFP_I16_F64, "__mspabi_fltid", ISD::SETCC_INVALID }, + { RTLIB::SINTTOFP_I32_F64, "__mspabi_fltlid", ISD::SETCC_INVALID }, + // TODO The following IS implemented in libgcc but is not in the EABI + { RTLIB::SINTTOFP_I64_F64, "__mspabi_fltllid", ISD::SETCC_INVALID }, + // TODO The following IS implemented in libgcc + //{ RTLIB::UINTTOFP_I16_F64, "__mspabi_fltud", ISD::SETCC_INVALID }, + { RTLIB::UINTTOFP_I32_F64, "__mspabi_fltuld", ISD::SETCC_INVALID }, + // The following IS implemented in libgcc but is not in the EABI + { RTLIB::UINTTOFP_I64_F64, "__mspabi_fltulld", ISD::SETCC_INVALID }, + // TODO The following IS implemented in libgcc + //{ RTLIB::SINTTOFP_I16_F32, "__mspabi_fltif", ISD::SETCC_INVALID }, + { RTLIB::SINTTOFP_I32_F32, "__mspabi_fltlif", ISD::SETCC_INVALID }, + // TODO The following IS implemented in libgcc but is not in the EABI + { RTLIB::SINTTOFP_I64_F32, "__mspabi_fltllif", ISD::SETCC_INVALID }, + // TODO The following IS implemented in libgcc + //{ RTLIB::UINTTOFP_I16_F32, "__mspabi_fltuf", ISD::SETCC_INVALID }, + { RTLIB::UINTTOFP_I32_F32, "__mspabi_fltulf", ISD::SETCC_INVALID }, + // The following IS implemented in libgcc but is not in the EABI + { RTLIB::UINTTOFP_I64_F32, "__mspabi_fltullf", ISD::SETCC_INVALID }, + + // Floating point comparisons - EABI Table 7 + { RTLIB::OEQ_F64, "__mspabi_cmpd", ISD::SETEQ }, + { RTLIB::UNE_F64, "__mspabi_cmpd", ISD::SETNE }, + { RTLIB::OGE_F64, "__mspabi_cmpd", ISD::SETGE }, + { RTLIB::OLT_F64, "__mspabi_cmpd", ISD::SETLT }, + { RTLIB::OLE_F64, "__mspabi_cmpd", ISD::SETLE }, + { RTLIB::OGT_F64, "__mspabi_cmpd", ISD::SETGT }, + { RTLIB::OEQ_F32, "__mspabi_cmpf", ISD::SETEQ }, + { RTLIB::UNE_F32, "__mspabi_cmpf", ISD::SETNE }, + { RTLIB::OGE_F32, "__mspabi_cmpf", ISD::SETGE }, + { RTLIB::OLT_F32, "__mspabi_cmpf", ISD::SETLT }, + { RTLIB::OLE_F32, "__mspabi_cmpf", ISD::SETLE }, + { RTLIB::OGT_F32, "__mspabi_cmpf", ISD::SETGT }, + + // Floating point arithmetic - EABI Table 8 + { RTLIB::ADD_F64, "__mspabi_addd", ISD::SETCC_INVALID }, + { RTLIB::ADD_F32, "__mspabi_addf", ISD::SETCC_INVALID }, + { RTLIB::DIV_F64, "__mspabi_divd", ISD::SETCC_INVALID }, + { RTLIB::DIV_F32, "__mspabi_divf", ISD::SETCC_INVALID }, + { RTLIB::MUL_F64, "__mspabi_mpyd", ISD::SETCC_INVALID }, + { RTLIB::MUL_F32, "__mspabi_mpyf", ISD::SETCC_INVALID }, + { RTLIB::SUB_F64, "__mspabi_subd", ISD::SETCC_INVALID }, + { RTLIB::SUB_F32, "__mspabi_subf", ISD::SETCC_INVALID }, + // The following are NOT implemented in libgcc + // { RTLIB::NEG_F64, "__mspabi_negd", ISD::SETCC_INVALID }, + // { RTLIB::NEG_F32, "__mspabi_negf", ISD::SETCC_INVALID }, + + // Universal Integer Operations - EABI Table 9 + { RTLIB::SDIV_I16, "__mspabi_divi", ISD::SETCC_INVALID }, + { RTLIB::SDIV_I32, "__mspabi_divli", ISD::SETCC_INVALID }, + { RTLIB::SDIV_I64, "__mspabi_divlli", ISD::SETCC_INVALID }, + { RTLIB::UDIV_I16, "__mspabi_divu", ISD::SETCC_INVALID }, + { RTLIB::UDIV_I32, "__mspabi_divul", ISD::SETCC_INVALID }, + { RTLIB::UDIV_I64, "__mspabi_divull", ISD::SETCC_INVALID }, + { RTLIB::SREM_I16, "__mspabi_remi", ISD::SETCC_INVALID }, + { RTLIB::SREM_I32, "__mspabi_remli", ISD::SETCC_INVALID }, + { RTLIB::SREM_I64, "__mspabi_remlli", ISD::SETCC_INVALID }, + { RTLIB::UREM_I16, "__mspabi_remu", ISD::SETCC_INVALID }, + { RTLIB::UREM_I32, "__mspabi_remul", ISD::SETCC_INVALID }, + { RTLIB::UREM_I64, "__mspabi_remull", ISD::SETCC_INVALID }, + + // Bitwise Operations - EABI Table 10 + // TODO: __mspabi_[srli/srai/slli] ARE implemented in libgcc + { RTLIB::SRL_I32, "__mspabi_srll", ISD::SETCC_INVALID }, + { RTLIB::SRA_I32, "__mspabi_sral", ISD::SETCC_INVALID }, + { RTLIB::SHL_I32, "__mspabi_slll", ISD::SETCC_INVALID }, + // __mspabi_[srlll/srall/sllll/rlli/rlll] are NOT implemented in libgcc + + }; + + for (const auto &LC : LibraryCalls) { + setLibcallName(LC.Op, LC.Name); + if (LC.Cond != ISD::SETCC_INVALID) + setCmpLibcallCC(LC.Op, LC.Cond); + } + + if (STI.hasHWMult16()) { + const struct { + const RTLIB::Libcall Op; + const char * const Name; + } LibraryCalls[] = { + // Integer Multiply - EABI Table 9 + { RTLIB::MUL_I16, "__mspabi_mpyi_hw" }, + { RTLIB::MUL_I32, "__mspabi_mpyl_hw" }, + { RTLIB::MUL_I64, "__mspabi_mpyll_hw" }, + // TODO The __mspabi_mpysl*_hw functions ARE implemented in libgcc + // TODO The __mspabi_mpyul*_hw functions ARE implemented in libgcc + }; + for (const auto &LC : LibraryCalls) { + setLibcallName(LC.Op, LC.Name); + } + } else if (STI.hasHWMult32()) { + const struct { + const RTLIB::Libcall Op; + const char * const Name; + } LibraryCalls[] = { + // Integer Multiply - EABI Table 9 + { RTLIB::MUL_I16, "__mspabi_mpyi_hw" }, + { RTLIB::MUL_I32, "__mspabi_mpyl_hw32" }, + { RTLIB::MUL_I64, "__mspabi_mpyll_hw32" }, + // TODO The __mspabi_mpysl*_hw32 functions ARE implemented in libgcc + // TODO The __mspabi_mpyul*_hw32 functions ARE implemented in libgcc + }; + for (const auto &LC : LibraryCalls) { + setLibcallName(LC.Op, LC.Name); + } + } else if (STI.hasHWMultF5()) { + const struct { + const RTLIB::Libcall Op; + const char * const Name; + } LibraryCalls[] = { + // Integer Multiply - EABI Table 9 + { RTLIB::MUL_I16, "__mspabi_mpyi_f5hw" }, + { RTLIB::MUL_I32, "__mspabi_mpyl_f5hw" }, + { RTLIB::MUL_I64, "__mspabi_mpyll_f5hw" }, + // TODO The __mspabi_mpysl*_f5hw functions ARE implemented in libgcc + // TODO The __mspabi_mpyul*_f5hw functions ARE implemented in libgcc + }; + for (const auto &LC : LibraryCalls) { + setLibcallName(LC.Op, LC.Name); + } + } else { // NoHWMult + const struct { + const RTLIB::Libcall Op; + const char * const Name; + } LibraryCalls[] = { + // Integer Multiply - EABI Table 9 + { RTLIB::MUL_I16, "__mspabi_mpyi" }, + { RTLIB::MUL_I32, "__mspabi_mpyl" }, + { RTLIB::MUL_I64, "__mspabi_mpyll" }, + // The __mspabi_mpysl* functions are NOT implemented in libgcc + // The __mspabi_mpyul* functions are NOT implemented in libgcc + }; + for (const auto &LC : LibraryCalls) { + setLibcallName(LC.Op, LC.Name); + } + setLibcallCallingConv(RTLIB::MUL_I64, CallingConv::MSP430_BUILTIN); + } + + // Several of the runtime library functions use a special calling conv + setLibcallCallingConv(RTLIB::UDIV_I64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::UREM_I64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::SDIV_I64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::SREM_I64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::ADD_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::SUB_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::MUL_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::DIV_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::OEQ_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::UNE_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::OGE_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::OLT_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::OLE_F64, CallingConv::MSP430_BUILTIN); + setLibcallCallingConv(RTLIB::OGT_F64, CallingConv::MSP430_BUILTIN); + // TODO: __mspabi_srall, __mspabi_srlll, __mspabi_sllll + + setMinFunctionAlignment(Align(2)); + setPrefFunctionAlignment(Align(2)); +} + +SDValue MSP430TargetLowering::LowerOperation(SDValue Op, + SelectionDAG &DAG) const { + switch (Op.getOpcode()) { + case ISD::SHL: // FALLTHROUGH + case ISD::SRL: + case ISD::SRA: return LowerShifts(Op, DAG); + case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG); + case ISD::BlockAddress: return LowerBlockAddress(Op, DAG); + case ISD::ExternalSymbol: return LowerExternalSymbol(Op, DAG); + case ISD::SETCC: return LowerSETCC(Op, DAG); + case ISD::BR_CC: return LowerBR_CC(Op, DAG); + case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG); + case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, DAG); + case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG); + case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG); + case ISD::VASTART: return LowerVASTART(Op, DAG); + case ISD::JumpTable: return LowerJumpTable(Op, DAG); + default: + llvm_unreachable("unimplemented operand"); + } +} + +// Define non profitable transforms into shifts +bool MSP430TargetLowering::shouldAvoidTransformToShift(EVT VT, + unsigned Amount) const { + return !(Amount == 8 || Amount == 9 || Amount<=2); +} + +// Implemented to verify test case assertions in +// tests/codegen/msp430/shift-amount-threshold-b.ll +bool MSP430TargetLowering::isLegalICmpImmediate(int64_t Immed) const { + if (MSP430NoLegalImmediate) + return Immed >= -32 && Immed < 32; + return TargetLowering::isLegalICmpImmediate(Immed); +} + +//===----------------------------------------------------------------------===// +// MSP430 Inline Assembly Support +//===----------------------------------------------------------------------===// + +/// getConstraintType - Given a constraint letter, return the type of +/// constraint it is for this target. +TargetLowering::ConstraintType +MSP430TargetLowering::getConstraintType(StringRef Constraint) const { + if (Constraint.size() == 1) { + switch (Constraint[0]) { + case 'r': + return C_RegisterClass; + default: + break; + } + } + return TargetLowering::getConstraintType(Constraint); +} + +std::pair<unsigned, const TargetRegisterClass *> +MSP430TargetLowering::getRegForInlineAsmConstraint( + const TargetRegisterInfo *TRI, StringRef Constraint, MVT VT) const { + if (Constraint.size() == 1) { + // GCC Constraint Letters + switch (Constraint[0]) { + default: break; + case 'r': // GENERAL_REGS + if (VT == MVT::i8) + return std::make_pair(0U, &MSP430::GR8RegClass); + + return std::make_pair(0U, &MSP430::GR16RegClass); + } + } + + return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT); +} + +//===----------------------------------------------------------------------===// +// Calling Convention Implementation +//===----------------------------------------------------------------------===// + +#include "MSP430GenCallingConv.inc" + +/// For each argument in a function store the number of pieces it is composed +/// of. +template<typename ArgT> +static void ParseFunctionArgs(const SmallVectorImpl<ArgT> &Args, + SmallVectorImpl<unsigned> &Out) { + unsigned CurrentArgIndex; + + if (Args.empty()) + return; + + CurrentArgIndex = Args[0].OrigArgIndex; + Out.push_back(0); + + for (auto &Arg : Args) { + if (CurrentArgIndex == Arg.OrigArgIndex) { + Out.back() += 1; + } else { + Out.push_back(1); + CurrentArgIndex = Arg.OrigArgIndex; + } + } +} + +static void AnalyzeVarArgs(CCState &State, + const SmallVectorImpl<ISD::OutputArg> &Outs) { + State.AnalyzeCallOperands(Outs, CC_MSP430_AssignStack); +} + +static void AnalyzeVarArgs(CCState &State, + const SmallVectorImpl<ISD::InputArg> &Ins) { + State.AnalyzeFormalArguments(Ins, CC_MSP430_AssignStack); +} + +/// Analyze incoming and outgoing function arguments. We need custom C++ code +/// to handle special constraints in the ABI like reversing the order of the +/// pieces of splitted arguments. In addition, all pieces of a certain argument +/// have to be passed either using registers or the stack but never mixing both. +template<typename ArgT> +static void AnalyzeArguments(CCState &State, + SmallVectorImpl<CCValAssign> &ArgLocs, + const SmallVectorImpl<ArgT> &Args) { + static const MCPhysReg CRegList[] = { + MSP430::R12, MSP430::R13, MSP430::R14, MSP430::R15 + }; + static const unsigned CNbRegs = array_lengthof(CRegList); + static const MCPhysReg BuiltinRegList[] = { + MSP430::R8, MSP430::R9, MSP430::R10, MSP430::R11, + MSP430::R12, MSP430::R13, MSP430::R14, MSP430::R15 + }; + static const unsigned BuiltinNbRegs = array_lengthof(BuiltinRegList); + + ArrayRef<MCPhysReg> RegList; + unsigned NbRegs; + + bool Builtin = (State.getCallingConv() == CallingConv::MSP430_BUILTIN); + if (Builtin) { + RegList = BuiltinRegList; + NbRegs = BuiltinNbRegs; + } else { + RegList = CRegList; + NbRegs = CNbRegs; + } + + if (State.isVarArg()) { + AnalyzeVarArgs(State, Args); + return; + } + + SmallVector<unsigned, 4> ArgsParts; + ParseFunctionArgs(Args, ArgsParts); + + if (Builtin) { + assert(ArgsParts.size() == 2 && + "Builtin calling convention requires two arguments"); + } + + unsigned RegsLeft = NbRegs; + bool UsedStack = false; + unsigned ValNo = 0; + + for (unsigned i = 0, e = ArgsParts.size(); i != e; i++) { + MVT ArgVT = Args[ValNo].VT; + ISD::ArgFlagsTy ArgFlags = Args[ValNo].Flags; + MVT LocVT = ArgVT; + CCValAssign::LocInfo LocInfo = CCValAssign::Full; + + // Promote i8 to i16 + if (LocVT == MVT::i8) { + LocVT = MVT::i16; + if (ArgFlags.isSExt()) + LocInfo = CCValAssign::SExt; + else if (ArgFlags.isZExt()) + LocInfo = CCValAssign::ZExt; + else + LocInfo = CCValAssign::AExt; + } + + // Handle byval arguments + if (ArgFlags.isByVal()) { + State.HandleByVal(ValNo++, ArgVT, LocVT, LocInfo, 2, Align(2), ArgFlags); + continue; + } + + unsigned Parts = ArgsParts[i]; + + if (Builtin) { + assert(Parts == 4 && + "Builtin calling convention requires 64-bit arguments"); + } + + if (!UsedStack && Parts == 2 && RegsLeft == 1) { + // Special case for 32-bit register split, see EABI section 3.3.3 + unsigned Reg = State.AllocateReg(RegList); + State.addLoc(CCValAssign::getReg(ValNo++, ArgVT, Reg, LocVT, LocInfo)); + RegsLeft -= 1; + + UsedStack = true; + CC_MSP430_AssignStack(ValNo++, ArgVT, LocVT, LocInfo, ArgFlags, State); + } else if (Parts <= RegsLeft) { + for (unsigned j = 0; j < Parts; j++) { + unsigned Reg = State.AllocateReg(RegList); + State.addLoc(CCValAssign::getReg(ValNo++, ArgVT, Reg, LocVT, LocInfo)); + RegsLeft--; + } + } else { + UsedStack = true; + for (unsigned j = 0; j < Parts; j++) + CC_MSP430_AssignStack(ValNo++, ArgVT, LocVT, LocInfo, ArgFlags, State); + } + } +} + +static void AnalyzeRetResult(CCState &State, + const SmallVectorImpl<ISD::InputArg> &Ins) { + State.AnalyzeCallResult(Ins, RetCC_MSP430); +} + +static void AnalyzeRetResult(CCState &State, + const SmallVectorImpl<ISD::OutputArg> &Outs) { + State.AnalyzeReturn(Outs, RetCC_MSP430); +} + +template<typename ArgT> +static void AnalyzeReturnValues(CCState &State, + SmallVectorImpl<CCValAssign> &RVLocs, + const SmallVectorImpl<ArgT> &Args) { + AnalyzeRetResult(State, Args); +} + +SDValue MSP430TargetLowering::LowerFormalArguments( + SDValue Chain, CallingConv::ID CallConv, bool isVarArg, + const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl, + SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const { + + switch (CallConv) { + default: + report_fatal_error("Unsupported calling convention"); + case CallingConv::C: + case CallingConv::Fast: + return LowerCCCArguments(Chain, CallConv, isVarArg, Ins, dl, DAG, InVals); + case CallingConv::MSP430_INTR: + if (Ins.empty()) + return Chain; + report_fatal_error("ISRs cannot have arguments"); + } +} + +SDValue +MSP430TargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI, + SmallVectorImpl<SDValue> &InVals) const { + SelectionDAG &DAG = CLI.DAG; + SDLoc &dl = CLI.DL; + SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs; + SmallVectorImpl<SDValue> &OutVals = CLI.OutVals; + SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins; + SDValue Chain = CLI.Chain; + SDValue Callee = CLI.Callee; + bool &isTailCall = CLI.IsTailCall; + CallingConv::ID CallConv = CLI.CallConv; + bool isVarArg = CLI.IsVarArg; + + // MSP430 target does not yet support tail call optimization. + isTailCall = false; + + switch (CallConv) { + default: + report_fatal_error("Unsupported calling convention"); + case CallingConv::MSP430_BUILTIN: + case CallingConv::Fast: + case CallingConv::C: + return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall, + Outs, OutVals, Ins, dl, DAG, InVals); + case CallingConv::MSP430_INTR: + report_fatal_error("ISRs cannot be called directly"); + } +} + +/// LowerCCCArguments - transform physical registers into virtual registers and +/// generate load operations for arguments places on the stack. +// FIXME: struct return stuff +SDValue MSP430TargetLowering::LowerCCCArguments( + SDValue Chain, CallingConv::ID CallConv, bool isVarArg, + const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl, + SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const { + MachineFunction &MF = DAG.getMachineFunction(); + MachineFrameInfo &MFI = MF.getFrameInfo(); + MachineRegisterInfo &RegInfo = MF.getRegInfo(); + MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>(); + + // Assign locations to all of the incoming arguments. + SmallVector<CCValAssign, 16> ArgLocs; + CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs, + *DAG.getContext()); + AnalyzeArguments(CCInfo, ArgLocs, Ins); + + // Create frame index for the start of the first vararg value + if (isVarArg) { + unsigned Offset = CCInfo.getNextStackOffset(); + FuncInfo->setVarArgsFrameIndex(MFI.CreateFixedObject(1, Offset, true)); + } + + for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { + CCValAssign &VA = ArgLocs[i]; + if (VA.isRegLoc()) { + // Arguments passed in registers + EVT RegVT = VA.getLocVT(); + switch (RegVT.getSimpleVT().SimpleTy) { + default: + { +#ifndef NDEBUG + errs() << "LowerFormalArguments Unhandled argument type: " + << RegVT.getEVTString() << "\n"; +#endif + llvm_unreachable(nullptr); + } + case MVT::i16: + Register VReg = RegInfo.createVirtualRegister(&MSP430::GR16RegClass); + RegInfo.addLiveIn(VA.getLocReg(), VReg); + SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, RegVT); + + // If this is an 8-bit value, it is really passed promoted to 16 + // bits. Insert an assert[sz]ext to capture this, then truncate to the + // right size. + if (VA.getLocInfo() == CCValAssign::SExt) + ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue, + DAG.getValueType(VA.getValVT())); + else if (VA.getLocInfo() == CCValAssign::ZExt) + ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue, + DAG.getValueType(VA.getValVT())); + + if (VA.getLocInfo() != CCValAssign::Full) + ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue); + + InVals.push_back(ArgValue); + } + } else { + // Sanity check + assert(VA.isMemLoc()); + + SDValue InVal; + ISD::ArgFlagsTy Flags = Ins[i].Flags; + + if (Flags.isByVal()) { + int FI = MFI.CreateFixedObject(Flags.getByValSize(), + VA.getLocMemOffset(), true); + InVal = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout())); + } else { + // Load the argument to a virtual register + unsigned ObjSize = VA.getLocVT().getSizeInBits()/8; + if (ObjSize > 2) { + errs() << "LowerFormalArguments Unhandled argument type: " + << EVT(VA.getLocVT()).getEVTString() + << "\n"; + } + // Create the frame index object for this incoming parameter... + int FI = MFI.CreateFixedObject(ObjSize, VA.getLocMemOffset(), true); + + // Create the SelectionDAG nodes corresponding to a load + //from this parameter + SDValue FIN = DAG.getFrameIndex(FI, MVT::i16); + InVal = DAG.getLoad( + VA.getLocVT(), dl, Chain, FIN, + MachinePointerInfo::getFixedStack(DAG.getMachineFunction(), FI)); + } + + InVals.push_back(InVal); + } + } + + for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { + if (Ins[i].Flags.isSRet()) { + unsigned Reg = FuncInfo->getSRetReturnReg(); + if (!Reg) { + Reg = MF.getRegInfo().createVirtualRegister( + getRegClassFor(MVT::i16)); + FuncInfo->setSRetReturnReg(Reg); + } + SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), dl, Reg, InVals[i]); + Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Copy, Chain); + } + } + + return Chain; +} + +bool +MSP430TargetLowering::CanLowerReturn(CallingConv::ID CallConv, + MachineFunction &MF, + bool IsVarArg, + const SmallVectorImpl<ISD::OutputArg> &Outs, + LLVMContext &Context) const { + SmallVector<CCValAssign, 16> RVLocs; + CCState CCInfo(CallConv, IsVarArg, MF, RVLocs, Context); + return CCInfo.CheckReturn(Outs, RetCC_MSP430); +} + +SDValue +MSP430TargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv, + bool isVarArg, + const SmallVectorImpl<ISD::OutputArg> &Outs, + const SmallVectorImpl<SDValue> &OutVals, + const SDLoc &dl, SelectionDAG &DAG) const { + + MachineFunction &MF = DAG.getMachineFunction(); + + // CCValAssign - represent the assignment of the return value to a location + SmallVector<CCValAssign, 16> RVLocs; + + // ISRs cannot return any value. + if (CallConv == CallingConv::MSP430_INTR && !Outs.empty()) + report_fatal_error("ISRs cannot return any value"); + + // CCState - Info about the registers and stack slot. + CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs, + *DAG.getContext()); + + // Analize return values. + AnalyzeReturnValues(CCInfo, RVLocs, Outs); + + SDValue Flag; + SmallVector<SDValue, 4> RetOps(1, Chain); + + // Copy the result values into the output registers. + for (unsigned i = 0; i != RVLocs.size(); ++i) { + CCValAssign &VA = RVLocs[i]; + assert(VA.isRegLoc() && "Can only return in registers!"); + + Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(), + OutVals[i], Flag); + + // Guarantee that all emitted copies are stuck together, + // avoiding something bad. + Flag = Chain.getValue(1); + RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT())); + } + + if (MF.getFunction().hasStructRetAttr()) { + MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>(); + unsigned Reg = FuncInfo->getSRetReturnReg(); + + if (!Reg) + llvm_unreachable("sret virtual register not created in entry block"); + + SDValue Val = + DAG.getCopyFromReg(Chain, dl, Reg, getPointerTy(DAG.getDataLayout())); + unsigned R12 = MSP430::R12; + + Chain = DAG.getCopyToReg(Chain, dl, R12, Val, Flag); + Flag = Chain.getValue(1); + RetOps.push_back(DAG.getRegister(R12, getPointerTy(DAG.getDataLayout()))); + } + + unsigned Opc = (CallConv == CallingConv::MSP430_INTR ? + MSP430ISD::RETI_FLAG : MSP430ISD::RET_FLAG); + + RetOps[0] = Chain; // Update chain. + + // Add the flag if we have it. + if (Flag.getNode()) + RetOps.push_back(Flag); + + return DAG.getNode(Opc, dl, MVT::Other, RetOps); +} + +/// LowerCCCCallTo - functions arguments are copied from virtual regs to +/// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted. +SDValue MSP430TargetLowering::LowerCCCCallTo( + SDValue Chain, SDValue Callee, CallingConv::ID CallConv, bool isVarArg, + bool isTailCall, const SmallVectorImpl<ISD::OutputArg> &Outs, + const SmallVectorImpl<SDValue> &OutVals, + const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl, + SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const { + // Analyze operands of the call, assigning locations to each operand. + SmallVector<CCValAssign, 16> ArgLocs; + CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs, + *DAG.getContext()); + AnalyzeArguments(CCInfo, ArgLocs, Outs); + + // Get a count of how many bytes are to be pushed on the stack. + unsigned NumBytes = CCInfo.getNextStackOffset(); + auto PtrVT = getPointerTy(DAG.getDataLayout()); + + Chain = DAG.getCALLSEQ_START(Chain, NumBytes, 0, dl); + + SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass; + SmallVector<SDValue, 12> MemOpChains; + SDValue StackPtr; + + // Walk the register/memloc assignments, inserting copies/loads. + for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) { + CCValAssign &VA = ArgLocs[i]; + + SDValue Arg = OutVals[i]; + + // Promote the value if needed. + switch (VA.getLocInfo()) { + default: llvm_unreachable("Unknown loc info!"); + case CCValAssign::Full: break; + case CCValAssign::SExt: + Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg); + break; + case CCValAssign::ZExt: + Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg); + break; + case CCValAssign::AExt: + Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg); + break; + } + + // Arguments that can be passed on register must be kept at RegsToPass + // vector + if (VA.isRegLoc()) { + RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg)); + } else { + assert(VA.isMemLoc()); + + if (!StackPtr.getNode()) + StackPtr = DAG.getCopyFromReg(Chain, dl, MSP430::SP, PtrVT); + + SDValue PtrOff = + DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, + DAG.getIntPtrConstant(VA.getLocMemOffset(), dl)); + + SDValue MemOp; + ISD::ArgFlagsTy Flags = Outs[i].Flags; + + if (Flags.isByVal()) { + SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), dl, MVT::i16); + MemOp = DAG.getMemcpy( + Chain, dl, PtrOff, Arg, SizeNode, Flags.getNonZeroByValAlign(), + /*isVolatile*/ false, + /*AlwaysInline=*/true, + /*isTailCall=*/false, MachinePointerInfo(), MachinePointerInfo()); + } else { + MemOp = DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo()); + } + + MemOpChains.push_back(MemOp); + } + } + + // Transform all store nodes into one single node because all store nodes are + // independent of each other. + if (!MemOpChains.empty()) + Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains); + + // Build a sequence of copy-to-reg nodes chained together with token chain and + // flag operands which copy the outgoing args into registers. The InFlag in + // necessary since all emitted instructions must be stuck together. + SDValue InFlag; + for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) { + Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first, + RegsToPass[i].second, InFlag); + InFlag = Chain.getValue(1); + } + + // If the callee is a GlobalAddress node (quite common, every direct call is) + // turn it into a TargetGlobalAddress node so that legalize doesn't hack it. + // Likewise ExternalSymbol -> TargetExternalSymbol. + if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) + Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i16); + else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee)) + Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i16); + + // Returns a chain & a flag for retval copy to use. + SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue); + SmallVector<SDValue, 8> Ops; + Ops.push_back(Chain); + Ops.push_back(Callee); + + // Add argument registers to the end of the list so that they are + // known live into the call. + for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) + Ops.push_back(DAG.getRegister(RegsToPass[i].first, + RegsToPass[i].second.getValueType())); + + if (InFlag.getNode()) + Ops.push_back(InFlag); + + Chain = DAG.getNode(MSP430ISD::CALL, dl, NodeTys, Ops); + InFlag = Chain.getValue(1); + + // Create the CALLSEQ_END node. + Chain = DAG.getCALLSEQ_END(Chain, DAG.getConstant(NumBytes, dl, PtrVT, true), + DAG.getConstant(0, dl, PtrVT, true), InFlag, dl); + InFlag = Chain.getValue(1); + + // Handle result values, copying them out of physregs into vregs that we + // return. + return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl, + DAG, InVals); +} + +/// LowerCallResult - Lower the result values of a call into the +/// appropriate copies out of appropriate physical registers. +/// +SDValue MSP430TargetLowering::LowerCallResult( + SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool isVarArg, + const SmallVectorImpl<ISD::InputArg> &Ins, const SDLoc &dl, + SelectionDAG &DAG, SmallVectorImpl<SDValue> &InVals) const { + + // Assign locations to each value returned by this call. + SmallVector<CCValAssign, 16> RVLocs; + CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs, + *DAG.getContext()); + + AnalyzeReturnValues(CCInfo, RVLocs, Ins); + + // Copy all of the result registers out of their specified physreg. + for (unsigned i = 0; i != RVLocs.size(); ++i) { + Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(), + RVLocs[i].getValVT(), InFlag).getValue(1); + InFlag = Chain.getValue(2); + InVals.push_back(Chain.getValue(0)); + } + + return Chain; +} + +SDValue MSP430TargetLowering::LowerShifts(SDValue Op, + SelectionDAG &DAG) const { + unsigned Opc = Op.getOpcode(); + SDNode* N = Op.getNode(); + EVT VT = Op.getValueType(); + SDLoc dl(N); + + // Expand non-constant shifts to loops: + if (!isa<ConstantSDNode>(N->getOperand(1))) + return Op; + + uint64_t ShiftAmount = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue(); + + // Expand the stuff into sequence of shifts. + SDValue Victim = N->getOperand(0); + + if (ShiftAmount >= 8) { + assert(VT == MVT::i16 && "Can not shift i8 by 8 and more"); + switch(Opc) { + default: + llvm_unreachable("Unknown shift"); + case ISD::SHL: + // foo << (8 + N) => swpb(zext(foo)) << N + Victim = DAG.getZeroExtendInReg(Victim, dl, MVT::i8); + Victim = DAG.getNode(ISD::BSWAP, dl, VT, Victim); + break; + case ISD::SRA: + case ISD::SRL: + // foo >> (8 + N) => sxt(swpb(foo)) >> N + Victim = DAG.getNode(ISD::BSWAP, dl, VT, Victim); + Victim = (Opc == ISD::SRA) + ? DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, VT, Victim, + DAG.getValueType(MVT::i8)) + : DAG.getZeroExtendInReg(Victim, dl, MVT::i8); + break; + } + ShiftAmount -= 8; + } + + if (Opc == ISD::SRL && ShiftAmount) { + // Emit a special goodness here: + // srl A, 1 => clrc; rrc A + Victim = DAG.getNode(MSP430ISD::RRCL, dl, VT, Victim); + ShiftAmount -= 1; + } + + while (ShiftAmount--) + Victim = DAG.getNode((Opc == ISD::SHL ? MSP430ISD::RLA : MSP430ISD::RRA), + dl, VT, Victim); + + return Victim; +} + +SDValue MSP430TargetLowering::LowerGlobalAddress(SDValue Op, + SelectionDAG &DAG) const { + const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal(); + int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset(); + auto PtrVT = getPointerTy(DAG.getDataLayout()); + + // Create the TargetGlobalAddress node, folding in the constant offset. + SDValue Result = DAG.getTargetGlobalAddress(GV, SDLoc(Op), PtrVT, Offset); + return DAG.getNode(MSP430ISD::Wrapper, SDLoc(Op), PtrVT, Result); +} + +SDValue MSP430TargetLowering::LowerExternalSymbol(SDValue Op, + SelectionDAG &DAG) const { + SDLoc dl(Op); + const char *Sym = cast<ExternalSymbolSDNode>(Op)->getSymbol(); + auto PtrVT = getPointerTy(DAG.getDataLayout()); + SDValue Result = DAG.getTargetExternalSymbol(Sym, PtrVT); + + return DAG.getNode(MSP430ISD::Wrapper, dl, PtrVT, Result); +} + +SDValue MSP430TargetLowering::LowerBlockAddress(SDValue Op, + SelectionDAG &DAG) const { + SDLoc dl(Op); + auto PtrVT = getPointerTy(DAG.getDataLayout()); + const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress(); + SDValue Result = DAG.getTargetBlockAddress(BA, PtrVT); + + return DAG.getNode(MSP430ISD::Wrapper, dl, PtrVT, Result); +} + +static SDValue EmitCMP(SDValue &LHS, SDValue &RHS, SDValue &TargetCC, + ISD::CondCode CC, const SDLoc &dl, SelectionDAG &DAG) { + // FIXME: Handle bittests someday + assert(!LHS.getValueType().isFloatingPoint() && "We don't handle FP yet"); + + // FIXME: Handle jump negative someday + MSP430CC::CondCodes TCC = MSP430CC::COND_INVALID; + switch (CC) { + default: llvm_unreachable("Invalid integer condition!"); + case ISD::SETEQ: + TCC = MSP430CC::COND_E; // aka COND_Z + // Minor optimization: if LHS is a constant, swap operands, then the + // constant can be folded into comparison. + if (LHS.getOpcode() == ISD::Constant) + std::swap(LHS, RHS); + break; + case ISD::SETNE: + TCC = MSP430CC::COND_NE; // aka COND_NZ + // Minor optimization: if LHS is a constant, swap operands, then the + // constant can be folded into comparison. + if (LHS.getOpcode() == ISD::Constant) + std::swap(LHS, RHS); + break; + case ISD::SETULE: + std::swap(LHS, RHS); + LLVM_FALLTHROUGH; + case ISD::SETUGE: + // Turn lhs u>= rhs with lhs constant into rhs u< lhs+1, this allows us to + // fold constant into instruction. + if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) { + LHS = RHS; + RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0)); + TCC = MSP430CC::COND_LO; + break; + } + TCC = MSP430CC::COND_HS; // aka COND_C + break; + case ISD::SETUGT: + std::swap(LHS, RHS); + LLVM_FALLTHROUGH; + case ISD::SETULT: + // Turn lhs u< rhs with lhs constant into rhs u>= lhs+1, this allows us to + // fold constant into instruction. + if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) { + LHS = RHS; + RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0)); + TCC = MSP430CC::COND_HS; + break; + } + TCC = MSP430CC::COND_LO; // aka COND_NC + break; + case ISD::SETLE: + std::swap(LHS, RHS); + LLVM_FALLTHROUGH; + case ISD::SETGE: + // Turn lhs >= rhs with lhs constant into rhs < lhs+1, this allows us to + // fold constant into instruction. + if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) { + LHS = RHS; + RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0)); + TCC = MSP430CC::COND_L; + break; + } + TCC = MSP430CC::COND_GE; + break; + case ISD::SETGT: + std::swap(LHS, RHS); + LLVM_FALLTHROUGH; + case ISD::SETLT: + // Turn lhs < rhs with lhs constant into rhs >= lhs+1, this allows us to + // fold constant into instruction. + if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) { + LHS = RHS; + RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0)); + TCC = MSP430CC::COND_GE; + break; + } + TCC = MSP430CC::COND_L; + break; + } + + TargetCC = DAG.getConstant(TCC, dl, MVT::i8); + return DAG.getNode(MSP430ISD::CMP, dl, MVT::Glue, LHS, RHS); +} + + +SDValue MSP430TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const { + SDValue Chain = Op.getOperand(0); + ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get(); + SDValue LHS = Op.getOperand(2); + SDValue RHS = Op.getOperand(3); + SDValue Dest = Op.getOperand(4); + SDLoc dl (Op); + + SDValue TargetCC; + SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG); + + return DAG.getNode(MSP430ISD::BR_CC, dl, Op.getValueType(), + Chain, Dest, TargetCC, Flag); +} + +SDValue MSP430TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const { + SDValue LHS = Op.getOperand(0); + SDValue RHS = Op.getOperand(1); + SDLoc dl (Op); + + // If we are doing an AND and testing against zero, then the CMP + // will not be generated. The AND (or BIT) will generate the condition codes, + // but they are different from CMP. + // FIXME: since we're doing a post-processing, use a pseudoinstr here, so + // lowering & isel wouldn't diverge. + bool andCC = false; + if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) { + if (RHSC->isNullValue() && LHS.hasOneUse() && + (LHS.getOpcode() == ISD::AND || + (LHS.getOpcode() == ISD::TRUNCATE && + LHS.getOperand(0).getOpcode() == ISD::AND))) { + andCC = true; + } + } + ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get(); + SDValue TargetCC; + SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG); + + // Get the condition codes directly from the status register, if its easy. + // Otherwise a branch will be generated. Note that the AND and BIT + // instructions generate different flags than CMP, the carry bit can be used + // for NE/EQ. + bool Invert = false; + bool Shift = false; + bool Convert = true; + switch (cast<ConstantSDNode>(TargetCC)->getZExtValue()) { + default: + Convert = false; + break; + case MSP430CC::COND_HS: + // Res = SR & 1, no processing is required + break; + case MSP430CC::COND_LO: + // Res = ~(SR & 1) + Invert = true; + break; + case MSP430CC::COND_NE: + if (andCC) { + // C = ~Z, thus Res = SR & 1, no processing is required + } else { + // Res = ~((SR >> 1) & 1) + Shift = true; + Invert = true; + } + break; + case MSP430CC::COND_E: + Shift = true; + // C = ~Z for AND instruction, thus we can put Res = ~(SR & 1), however, + // Res = (SR >> 1) & 1 is 1 word shorter. + break; + } + EVT VT = Op.getValueType(); + SDValue One = DAG.getConstant(1, dl, VT); + if (Convert) { + SDValue SR = DAG.getCopyFromReg(DAG.getEntryNode(), dl, MSP430::SR, + MVT::i16, Flag); + if (Shift) + // FIXME: somewhere this is turned into a SRL, lower it MSP specific? + SR = DAG.getNode(ISD::SRA, dl, MVT::i16, SR, One); + SR = DAG.getNode(ISD::AND, dl, MVT::i16, SR, One); + if (Invert) + SR = DAG.getNode(ISD::XOR, dl, MVT::i16, SR, One); + return SR; + } else { + SDValue Zero = DAG.getConstant(0, dl, VT); + SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue); + SDValue Ops[] = {One, Zero, TargetCC, Flag}; + return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, Ops); + } +} + +SDValue MSP430TargetLowering::LowerSELECT_CC(SDValue Op, + SelectionDAG &DAG) const { + SDValue LHS = Op.getOperand(0); + SDValue RHS = Op.getOperand(1); + SDValue TrueV = Op.getOperand(2); + SDValue FalseV = Op.getOperand(3); + ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get(); + SDLoc dl (Op); + + SDValue TargetCC; + SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG); + + SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue); + SDValue Ops[] = {TrueV, FalseV, TargetCC, Flag}; + + return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, Ops); +} + +SDValue MSP430TargetLowering::LowerSIGN_EXTEND(SDValue Op, + SelectionDAG &DAG) const { + SDValue Val = Op.getOperand(0); + EVT VT = Op.getValueType(); + SDLoc dl(Op); + + assert(VT == MVT::i16 && "Only support i16 for now!"); + + return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, VT, + DAG.getNode(ISD::ANY_EXTEND, dl, VT, Val), + DAG.getValueType(Val.getValueType())); +} + +SDValue +MSP430TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) const { + MachineFunction &MF = DAG.getMachineFunction(); + MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>(); + int ReturnAddrIndex = FuncInfo->getRAIndex(); + auto PtrVT = getPointerTy(MF.getDataLayout()); + + if (ReturnAddrIndex == 0) { + // Set up a frame object for the return address. + uint64_t SlotSize = MF.getDataLayout().getPointerSize(); + ReturnAddrIndex = MF.getFrameInfo().CreateFixedObject(SlotSize, -SlotSize, + true); + FuncInfo->setRAIndex(ReturnAddrIndex); + } + + return DAG.getFrameIndex(ReturnAddrIndex, PtrVT); +} + +SDValue MSP430TargetLowering::LowerRETURNADDR(SDValue Op, + SelectionDAG &DAG) const { + MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo(); + MFI.setReturnAddressIsTaken(true); + + if (verifyReturnAddressArgumentIsConstant(Op, DAG)) + return SDValue(); + + unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue(); + SDLoc dl(Op); + auto PtrVT = getPointerTy(DAG.getDataLayout()); + + if (Depth > 0) { + SDValue FrameAddr = LowerFRAMEADDR(Op, DAG); + SDValue Offset = + DAG.getConstant(DAG.getDataLayout().getPointerSize(), dl, MVT::i16); + return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), + DAG.getNode(ISD::ADD, dl, PtrVT, FrameAddr, Offset), + MachinePointerInfo()); + } + + // Just load the return address. + SDValue RetAddrFI = getReturnAddressFrameIndex(DAG); + return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), RetAddrFI, + MachinePointerInfo()); +} + +SDValue MSP430TargetLowering::LowerFRAMEADDR(SDValue Op, + SelectionDAG &DAG) const { + MachineFrameInfo &MFI = DAG.getMachineFunction().getFrameInfo(); + MFI.setFrameAddressIsTaken(true); + + EVT VT = Op.getValueType(); + SDLoc dl(Op); // FIXME probably not meaningful + unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue(); + SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl, + MSP430::R4, VT); + while (Depth--) + FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr, + MachinePointerInfo()); + return FrameAddr; +} + +SDValue MSP430TargetLowering::LowerVASTART(SDValue Op, + SelectionDAG &DAG) const { + MachineFunction &MF = DAG.getMachineFunction(); + MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>(); + auto PtrVT = getPointerTy(DAG.getDataLayout()); + + // Frame index of first vararg argument + SDValue FrameIndex = + DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT); + const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue(); + + // Create a store of the frame index to the location operand + return DAG.getStore(Op.getOperand(0), SDLoc(Op), FrameIndex, Op.getOperand(1), + MachinePointerInfo(SV)); +} + +SDValue MSP430TargetLowering::LowerJumpTable(SDValue Op, + SelectionDAG &DAG) const { + JumpTableSDNode *JT = cast<JumpTableSDNode>(Op); + auto PtrVT = getPointerTy(DAG.getDataLayout()); + SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), PtrVT); + return DAG.getNode(MSP430ISD::Wrapper, SDLoc(JT), PtrVT, Result); +} + +/// getPostIndexedAddressParts - returns true by value, base pointer and +/// offset pointer and addressing mode by reference if this node can be +/// combined with a load / store to form a post-indexed load / store. +bool MSP430TargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op, + SDValue &Base, + SDValue &Offset, + ISD::MemIndexedMode &AM, + SelectionDAG &DAG) const { + + LoadSDNode *LD = cast<LoadSDNode>(N); + if (LD->getExtensionType() != ISD::NON_EXTLOAD) + return false; + + EVT VT = LD->getMemoryVT(); + if (VT != MVT::i8 && VT != MVT::i16) + return false; + + if (Op->getOpcode() != ISD::ADD) + return false; + + if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Op->getOperand(1))) { + uint64_t RHSC = RHS->getZExtValue(); + if ((VT == MVT::i16 && RHSC != 2) || + (VT == MVT::i8 && RHSC != 1)) + return false; + + Base = Op->getOperand(0); + Offset = DAG.getConstant(RHSC, SDLoc(N), VT); + AM = ISD::POST_INC; + return true; + } + + return false; +} + + +const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const { + switch ((MSP430ISD::NodeType)Opcode) { + case MSP430ISD::FIRST_NUMBER: break; + case MSP430ISD::RET_FLAG: return "MSP430ISD::RET_FLAG"; + case MSP430ISD::RETI_FLAG: return "MSP430ISD::RETI_FLAG"; + case MSP430ISD::RRA: return "MSP430ISD::RRA"; + case MSP430ISD::RLA: return "MSP430ISD::RLA"; + case MSP430ISD::RRC: return "MSP430ISD::RRC"; + case MSP430ISD::RRCL: return "MSP430ISD::RRCL"; + case MSP430ISD::CALL: return "MSP430ISD::CALL"; + case MSP430ISD::Wrapper: return "MSP430ISD::Wrapper"; + case MSP430ISD::BR_CC: return "MSP430ISD::BR_CC"; + case MSP430ISD::CMP: return "MSP430ISD::CMP"; + case MSP430ISD::SETCC: return "MSP430ISD::SETCC"; + case MSP430ISD::SELECT_CC: return "MSP430ISD::SELECT_CC"; + case MSP430ISD::DADD: return "MSP430ISD::DADD"; + } + return nullptr; +} + +bool MSP430TargetLowering::isTruncateFree(Type *Ty1, + Type *Ty2) const { + if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy()) + return false; + + return (Ty1->getPrimitiveSizeInBits() > Ty2->getPrimitiveSizeInBits()); +} + +bool MSP430TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const { + if (!VT1.isInteger() || !VT2.isInteger()) + return false; + + return (VT1.getSizeInBits() > VT2.getSizeInBits()); +} + +bool MSP430TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const { + // MSP430 implicitly zero-extends 8-bit results in 16-bit registers. + return 0 && Ty1->isIntegerTy(8) && Ty2->isIntegerTy(16); +} + +bool MSP430TargetLowering::isZExtFree(EVT VT1, EVT VT2) const { + // MSP430 implicitly zero-extends 8-bit results in 16-bit registers. + return 0 && VT1 == MVT::i8 && VT2 == MVT::i16; +} + +bool MSP430TargetLowering::isZExtFree(SDValue Val, EVT VT2) const { + return isZExtFree(Val.getValueType(), VT2); +} + +//===----------------------------------------------------------------------===// +// Other Lowering Code +//===----------------------------------------------------------------------===// + +MachineBasicBlock * +MSP430TargetLowering::EmitShiftInstr(MachineInstr &MI, + MachineBasicBlock *BB) const { + MachineFunction *F = BB->getParent(); + MachineRegisterInfo &RI = F->getRegInfo(); + DebugLoc dl = MI.getDebugLoc(); + const TargetInstrInfo &TII = *F->getSubtarget().getInstrInfo(); + + unsigned Opc; + bool ClearCarry = false; + const TargetRegisterClass * RC; + switch (MI.getOpcode()) { + default: llvm_unreachable("Invalid shift opcode!"); + case MSP430::Shl8: + Opc = MSP430::ADD8rr; + RC = &MSP430::GR8RegClass; + break; + case MSP430::Shl16: + Opc = MSP430::ADD16rr; + RC = &MSP430::GR16RegClass; + break; + case MSP430::Sra8: + Opc = MSP430::RRA8r; + RC = &MSP430::GR8RegClass; + break; + case MSP430::Sra16: + Opc = MSP430::RRA16r; + RC = &MSP430::GR16RegClass; + break; + case MSP430::Srl8: + ClearCarry = true; + Opc = MSP430::RRC8r; + RC = &MSP430::GR8RegClass; + break; + case MSP430::Srl16: + ClearCarry = true; + Opc = MSP430::RRC16r; + RC = &MSP430::GR16RegClass; + break; + case MSP430::Rrcl8: + case MSP430::Rrcl16: { + BuildMI(*BB, MI, dl, TII.get(MSP430::BIC16rc), MSP430::SR) + .addReg(MSP430::SR).addImm(1); + Register SrcReg = MI.getOperand(1).getReg(); + Register DstReg = MI.getOperand(0).getReg(); + unsigned RrcOpc = MI.getOpcode() == MSP430::Rrcl16 + ? MSP430::RRC16r : MSP430::RRC8r; + BuildMI(*BB, MI, dl, TII.get(RrcOpc), DstReg) + .addReg(SrcReg); + MI.eraseFromParent(); // The pseudo instruction is gone now. + return BB; + } + } + + const BasicBlock *LLVM_BB = BB->getBasicBlock(); + MachineFunction::iterator I = ++BB->getIterator(); + + // Create loop block + MachineBasicBlock *LoopBB = F->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *RemBB = F->CreateMachineBasicBlock(LLVM_BB); + + F->insert(I, LoopBB); + F->insert(I, RemBB); + + // Update machine-CFG edges by transferring all successors of the current + // block to the block containing instructions after shift. + RemBB->splice(RemBB->begin(), BB, std::next(MachineBasicBlock::iterator(MI)), + BB->end()); + RemBB->transferSuccessorsAndUpdatePHIs(BB); + + // Add edges BB => LoopBB => RemBB, BB => RemBB, LoopBB => LoopBB + BB->addSuccessor(LoopBB); + BB->addSuccessor(RemBB); + LoopBB->addSuccessor(RemBB); + LoopBB->addSuccessor(LoopBB); + + Register ShiftAmtReg = RI.createVirtualRegister(&MSP430::GR8RegClass); + Register ShiftAmtReg2 = RI.createVirtualRegister(&MSP430::GR8RegClass); + Register ShiftReg = RI.createVirtualRegister(RC); + Register ShiftReg2 = RI.createVirtualRegister(RC); + Register ShiftAmtSrcReg = MI.getOperand(2).getReg(); + Register SrcReg = MI.getOperand(1).getReg(); + Register DstReg = MI.getOperand(0).getReg(); + + // BB: + // cmp 0, N + // je RemBB + BuildMI(BB, dl, TII.get(MSP430::CMP8ri)) + .addReg(ShiftAmtSrcReg).addImm(0); + BuildMI(BB, dl, TII.get(MSP430::JCC)) + .addMBB(RemBB) + .addImm(MSP430CC::COND_E); + + // LoopBB: + // ShiftReg = phi [%SrcReg, BB], [%ShiftReg2, LoopBB] + // ShiftAmt = phi [%N, BB], [%ShiftAmt2, LoopBB] + // ShiftReg2 = shift ShiftReg + // ShiftAmt2 = ShiftAmt - 1; + BuildMI(LoopBB, dl, TII.get(MSP430::PHI), ShiftReg) + .addReg(SrcReg).addMBB(BB) + .addReg(ShiftReg2).addMBB(LoopBB); + BuildMI(LoopBB, dl, TII.get(MSP430::PHI), ShiftAmtReg) + .addReg(ShiftAmtSrcReg).addMBB(BB) + .addReg(ShiftAmtReg2).addMBB(LoopBB); + if (ClearCarry) + BuildMI(LoopBB, dl, TII.get(MSP430::BIC16rc), MSP430::SR) + .addReg(MSP430::SR).addImm(1); + if (Opc == MSP430::ADD8rr || Opc == MSP430::ADD16rr) + BuildMI(LoopBB, dl, TII.get(Opc), ShiftReg2) + .addReg(ShiftReg) + .addReg(ShiftReg); + else + BuildMI(LoopBB, dl, TII.get(Opc), ShiftReg2) + .addReg(ShiftReg); + BuildMI(LoopBB, dl, TII.get(MSP430::SUB8ri), ShiftAmtReg2) + .addReg(ShiftAmtReg).addImm(1); + BuildMI(LoopBB, dl, TII.get(MSP430::JCC)) + .addMBB(LoopBB) + .addImm(MSP430CC::COND_NE); + + // RemBB: + // DestReg = phi [%SrcReg, BB], [%ShiftReg, LoopBB] + BuildMI(*RemBB, RemBB->begin(), dl, TII.get(MSP430::PHI), DstReg) + .addReg(SrcReg).addMBB(BB) + .addReg(ShiftReg2).addMBB(LoopBB); + + MI.eraseFromParent(); // The pseudo instruction is gone now. + return RemBB; +} + +MachineBasicBlock * +MSP430TargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI, + MachineBasicBlock *BB) const { + unsigned Opc = MI.getOpcode(); + + if (Opc == MSP430::Shl8 || Opc == MSP430::Shl16 || + Opc == MSP430::Sra8 || Opc == MSP430::Sra16 || + Opc == MSP430::Srl8 || Opc == MSP430::Srl16 || + Opc == MSP430::Rrcl8 || Opc == MSP430::Rrcl16) + return EmitShiftInstr(MI, BB); + + const TargetInstrInfo &TII = *BB->getParent()->getSubtarget().getInstrInfo(); + DebugLoc dl = MI.getDebugLoc(); + + assert((Opc == MSP430::Select16 || Opc == MSP430::Select8) && + "Unexpected instr type to insert"); + + // To "insert" a SELECT 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 I = ++BB->getIterator(); + + // thisMBB: + // ... + // TrueVal = ... + // cmpTY ccX, r1, r2 + // jCC copy1MBB + // fallthrough --> copy0MBB + MachineBasicBlock *thisMBB = BB; + MachineFunction *F = BB->getParent(); + MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB); + MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB); + F->insert(I, copy0MBB); + F->insert(I, copy1MBB); + // Update machine-CFG edges by transferring all successors of the current + // block to the new block which will contain the Phi node for the select. + copy1MBB->splice(copy1MBB->begin(), BB, + std::next(MachineBasicBlock::iterator(MI)), BB->end()); + copy1MBB->transferSuccessorsAndUpdatePHIs(BB); + // Next, add the true and fallthrough blocks as its successors. + BB->addSuccessor(copy0MBB); + BB->addSuccessor(copy1MBB); + + BuildMI(BB, dl, TII.get(MSP430::JCC)) + .addMBB(copy1MBB) + .addImm(MI.getOperand(3).getImm()); + + // copy0MBB: + // %FalseValue = ... + // # fallthrough to copy1MBB + BB = copy0MBB; + + // Update machine-CFG edges + BB->addSuccessor(copy1MBB); + + // copy1MBB: + // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ] + // ... + BB = copy1MBB; + BuildMI(*BB, BB->begin(), dl, TII.get(MSP430::PHI), MI.getOperand(0).getReg()) + .addReg(MI.getOperand(2).getReg()) + .addMBB(copy0MBB) + .addReg(MI.getOperand(1).getReg()) + .addMBB(thisMBB); + + MI.eraseFromParent(); // The pseudo instruction is gone now. + return BB; +} |