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//===-- MSP430ISelLowering.cpp - MSP430 DAG Lowering Implementation ------===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This file implements the MSP430TargetLowering class.
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//===----------------------------------------------------------------------===//
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#include "MSP430ISelLowering.h"
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#include "MSP430MachineFunctionInfo.h"
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#include "MSP430Subtarget.h"
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#include "MSP430TargetMachine.h"
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/CodeGen/TargetLoweringObjectFileImpl.h"
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#include "llvm/CodeGen/ValueTypes.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalAlias.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#define DEBUG_TYPE "msp430-lower"
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static cl::opt<HWMultUseMode>
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HWMultMode("msp430-hwmult-mode", cl::Hidden,
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cl::desc("Hardware multiplier use mode"),
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cl::init(HWMultNoIntr),
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clEnumValN(NoHWMult, "no",
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"Do not use hardware multiplier"),
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clEnumValN(HWMultIntr, "interrupts",
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"Assume hardware multiplier can be used inside interrupts"),
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clEnumValN(HWMultNoIntr, "use",
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"Assume hardware multiplier cannot be used inside interrupts"),
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MSP430TargetLowering::MSP430TargetLowering(const TargetMachine &TM,
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const MSP430Subtarget &STI)
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: TargetLowering(TM) {
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// Set up the register classes.
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addRegisterClass(MVT::i8, &MSP430::GR8RegClass);
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addRegisterClass(MVT::i16, &MSP430::GR16RegClass);
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// Compute derived properties from the register classes
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computeRegisterProperties(STI.getRegisterInfo());
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// Provide all sorts of operation actions
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// Division is expensive
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setIntDivIsCheap(false);
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setStackPointerRegisterToSaveRestore(MSP430::SP);
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setBooleanContents(ZeroOrOneBooleanContent);
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setBooleanVectorContents(ZeroOrOneBooleanContent); // FIXME: Is this correct?
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// We have post-incremented loads / stores.
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setIndexedLoadAction(ISD::POST_INC, MVT::i8, Legal);
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setIndexedLoadAction(ISD::POST_INC, MVT::i16, Legal);
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for (MVT VT : MVT::integer_valuetypes()) {
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setLoadExtAction(ISD::EXTLOAD, VT, MVT::i1, Promote);
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setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
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setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i1, Promote);
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setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i8, Expand);
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setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i16, Expand);
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// We don't have any truncstores
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setTruncStoreAction(MVT::i16, MVT::i8, Expand);
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setOperationAction(ISD::SRA, MVT::i8, Custom);
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setOperationAction(ISD::SHL, MVT::i8, Custom);
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setOperationAction(ISD::SRL, MVT::i8, Custom);
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setOperationAction(ISD::SRA, MVT::i16, Custom);
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setOperationAction(ISD::SHL, MVT::i16, Custom);
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setOperationAction(ISD::SRL, MVT::i16, Custom);
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setOperationAction(ISD::ROTL, MVT::i8, Expand);
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setOperationAction(ISD::ROTR, MVT::i8, Expand);
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setOperationAction(ISD::ROTL, MVT::i16, Expand);
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setOperationAction(ISD::ROTR, MVT::i16, Expand);
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setOperationAction(ISD::GlobalAddress, MVT::i16, Custom);
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setOperationAction(ISD::ExternalSymbol, MVT::i16, Custom);
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setOperationAction(ISD::BlockAddress, MVT::i16, Custom);
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setOperationAction(ISD::BR_JT, MVT::Other, Expand);
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setOperationAction(ISD::BR_CC, MVT::i8, Custom);
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setOperationAction(ISD::BR_CC, MVT::i16, Custom);
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setOperationAction(ISD::BRCOND, MVT::Other, Expand);
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setOperationAction(ISD::SETCC, MVT::i8, Custom);
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setOperationAction(ISD::SETCC, MVT::i16, Custom);
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setOperationAction(ISD::SELECT, MVT::i8, Expand);
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setOperationAction(ISD::SELECT, MVT::i16, Expand);
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setOperationAction(ISD::SELECT_CC, MVT::i8, Custom);
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setOperationAction(ISD::SELECT_CC, MVT::i16, Custom);
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setOperationAction(ISD::SIGN_EXTEND, MVT::i16, Custom);
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setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i8, Expand);
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setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i16, Expand);
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setOperationAction(ISD::CTTZ, MVT::i8, Expand);
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setOperationAction(ISD::CTTZ, MVT::i16, Expand);
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setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i8, Expand);
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setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i16, Expand);
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setOperationAction(ISD::CTLZ, MVT::i8, Expand);
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setOperationAction(ISD::CTLZ, MVT::i16, Expand);
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setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i8, Expand);
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setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i16, Expand);
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setOperationAction(ISD::CTPOP, MVT::i8, Expand);
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setOperationAction(ISD::CTPOP, MVT::i16, Expand);
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setOperationAction(ISD::SHL_PARTS, MVT::i8, Expand);
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setOperationAction(ISD::SHL_PARTS, MVT::i16, Expand);
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setOperationAction(ISD::SRL_PARTS, MVT::i8, Expand);
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setOperationAction(ISD::SRL_PARTS, MVT::i16, Expand);
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setOperationAction(ISD::SRA_PARTS, MVT::i8, Expand);
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setOperationAction(ISD::SRA_PARTS, MVT::i16, Expand);
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setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
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// FIXME: Implement efficiently multiplication by a constant
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setOperationAction(ISD::MUL, MVT::i8, Expand);
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setOperationAction(ISD::MULHS, MVT::i8, Expand);
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setOperationAction(ISD::MULHU, MVT::i8, Expand);
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setOperationAction(ISD::SMUL_LOHI, MVT::i8, Expand);
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setOperationAction(ISD::UMUL_LOHI, MVT::i8, Expand);
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setOperationAction(ISD::MUL, MVT::i16, Expand);
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setOperationAction(ISD::MULHS, MVT::i16, Expand);
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setOperationAction(ISD::MULHU, MVT::i16, Expand);
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setOperationAction(ISD::SMUL_LOHI, MVT::i16, Expand);
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setOperationAction(ISD::UMUL_LOHI, MVT::i16, Expand);
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setOperationAction(ISD::UDIV, MVT::i8, Expand);
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setOperationAction(ISD::UDIVREM, MVT::i8, Expand);
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setOperationAction(ISD::UREM, MVT::i8, Expand);
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setOperationAction(ISD::SDIV, MVT::i8, Expand);
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setOperationAction(ISD::SDIVREM, MVT::i8, Expand);
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setOperationAction(ISD::SREM, MVT::i8, Expand);
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setOperationAction(ISD::UDIV, MVT::i16, Expand);
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setOperationAction(ISD::UDIVREM, MVT::i16, Expand);
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setOperationAction(ISD::UREM, MVT::i16, Expand);
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setOperationAction(ISD::SDIV, MVT::i16, Expand);
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setOperationAction(ISD::SDIVREM, MVT::i16, Expand);
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setOperationAction(ISD::SREM, MVT::i16, Expand);
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setOperationAction(ISD::VASTART, MVT::Other, Custom);
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setOperationAction(ISD::VAARG, MVT::Other, Expand);
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setOperationAction(ISD::VAEND, MVT::Other, Expand);
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setOperationAction(ISD::VACOPY, MVT::Other, Expand);
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setOperationAction(ISD::JumpTable, MVT::i16, Custom);
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if (HWMultMode == HWMultIntr) {
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setLibcallName(RTLIB::MUL_I8, "__mulqi3hw");
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setLibcallName(RTLIB::MUL_I16, "__mulhi3hw");
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} else if (HWMultMode == HWMultNoIntr) {
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setLibcallName(RTLIB::MUL_I8, "__mulqi3hw_noint");
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setLibcallName(RTLIB::MUL_I16, "__mulhi3hw_noint");
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setMinFunctionAlignment(1);
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setPrefFunctionAlignment(2);
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SDValue MSP430TargetLowering::LowerOperation(SDValue Op,
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SelectionDAG &DAG) const {
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switch (Op.getOpcode()) {
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case ISD::SHL: // FALLTHROUGH
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case ISD::SRA: return LowerShifts(Op, DAG);
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case ISD::GlobalAddress: return LowerGlobalAddress(Op, DAG);
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case ISD::BlockAddress: return LowerBlockAddress(Op, DAG);
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case ISD::ExternalSymbol: return LowerExternalSymbol(Op, DAG);
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case ISD::SETCC: return LowerSETCC(Op, DAG);
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case ISD::BR_CC: return LowerBR_CC(Op, DAG);
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case ISD::SELECT_CC: return LowerSELECT_CC(Op, DAG);
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case ISD::SIGN_EXTEND: return LowerSIGN_EXTEND(Op, DAG);
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case ISD::RETURNADDR: return LowerRETURNADDR(Op, DAG);
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case ISD::FRAMEADDR: return LowerFRAMEADDR(Op, DAG);
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case ISD::VASTART: return LowerVASTART(Op, DAG);
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case ISD::JumpTable: return LowerJumpTable(Op, DAG);
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llvm_unreachable("unimplemented operand");
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//===----------------------------------------------------------------------===//
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// MSP430 Inline Assembly Support
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//===----------------------------------------------------------------------===//
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/// getConstraintType - Given a constraint letter, return the type of
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/// constraint it is for this target.
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TargetLowering::ConstraintType
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MSP430TargetLowering::getConstraintType(StringRef Constraint) const {
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if (Constraint.size() == 1) {
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switch (Constraint[0]) {
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return C_RegisterClass;
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return TargetLowering::getConstraintType(Constraint);
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std::pair<unsigned, const TargetRegisterClass *>
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MSP430TargetLowering::getRegForInlineAsmConstraint(
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const TargetRegisterInfo *TRI, StringRef Constraint, MVT VT) const {
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if (Constraint.size() == 1) {
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// GCC Constraint Letters
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switch (Constraint[0]) {
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case 'r': // GENERAL_REGS
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return std::make_pair(0U, &MSP430::GR8RegClass);
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return std::make_pair(0U, &MSP430::GR16RegClass);
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return TargetLowering::getRegForInlineAsmConstraint(TRI, Constraint, VT);
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//===----------------------------------------------------------------------===//
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// Calling Convention Implementation
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//===----------------------------------------------------------------------===//
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#include "MSP430GenCallingConv.inc"
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/// For each argument in a function store the number of pieces it is composed
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template<typename ArgT>
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static void ParseFunctionArgs(const SmallVectorImpl<ArgT> &Args,
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SmallVectorImpl<unsigned> &Out) {
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unsigned CurrentArgIndex = ~0U;
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for (unsigned i = 0, e = Args.size(); i != e; i++) {
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if (CurrentArgIndex == Args[i].OrigArgIndex) {
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static void AnalyzeVarArgs(CCState &State,
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const SmallVectorImpl<ISD::OutputArg> &Outs) {
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State.AnalyzeCallOperands(Outs, CC_MSP430_AssignStack);
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static void AnalyzeVarArgs(CCState &State,
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const SmallVectorImpl<ISD::InputArg> &Ins) {
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State.AnalyzeFormalArguments(Ins, CC_MSP430_AssignStack);
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/// Analyze incoming and outgoing function arguments. We need custom C++ code
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/// to handle special constraints in the ABI like reversing the order of the
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/// pieces of splitted arguments. In addition, all pieces of a certain argument
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/// have to be passed either using registers or the stack but never mixing both.
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template<typename ArgT>
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static void AnalyzeArguments(CCState &State,
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SmallVectorImpl<CCValAssign> &ArgLocs,
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const SmallVectorImpl<ArgT> &Args) {
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static const MCPhysReg RegList[] = {
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MSP430::R15, MSP430::R14, MSP430::R13, MSP430::R12
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static const unsigned NbRegs = array_lengthof(RegList);
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if (State.isVarArg()) {
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AnalyzeVarArgs(State, Args);
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SmallVector<unsigned, 4> ArgsParts;
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ParseFunctionArgs(Args, ArgsParts);
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unsigned RegsLeft = NbRegs;
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bool UseStack = false;
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for (unsigned i = 0, e = ArgsParts.size(); i != e; i++) {
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MVT ArgVT = Args[ValNo].VT;
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ISD::ArgFlagsTy ArgFlags = Args[ValNo].Flags;
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CCValAssign::LocInfo LocInfo = CCValAssign::Full;
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if (LocVT == MVT::i8) {
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if (ArgFlags.isSExt())
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LocInfo = CCValAssign::SExt;
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else if (ArgFlags.isZExt())
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LocInfo = CCValAssign::ZExt;
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LocInfo = CCValAssign::AExt;
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// Handle byval arguments
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if (ArgFlags.isByVal()) {
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State.HandleByVal(ValNo++, ArgVT, LocVT, LocInfo, 2, 2, ArgFlags);
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unsigned Parts = ArgsParts[i];
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if (!UseStack && Parts <= RegsLeft) {
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unsigned FirstVal = ValNo;
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for (unsigned j = 0; j < Parts; j++) {
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unsigned Reg = State.AllocateReg(RegList);
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State.addLoc(CCValAssign::getReg(ValNo++, ArgVT, Reg, LocVT, LocInfo));
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// Reverse the order of the pieces to agree with the "big endian" format
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// required in the calling convention ABI.
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SmallVectorImpl<CCValAssign>::iterator B = ArgLocs.begin() + FirstVal;
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std::reverse(B, B + Parts);
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for (unsigned j = 0; j < Parts; j++)
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CC_MSP430_AssignStack(ValNo++, ArgVT, LocVT, LocInfo, ArgFlags, State);
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static void AnalyzeRetResult(CCState &State,
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const SmallVectorImpl<ISD::InputArg> &Ins) {
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State.AnalyzeCallResult(Ins, RetCC_MSP430);
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static void AnalyzeRetResult(CCState &State,
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const SmallVectorImpl<ISD::OutputArg> &Outs) {
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State.AnalyzeReturn(Outs, RetCC_MSP430);
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template<typename ArgT>
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static void AnalyzeReturnValues(CCState &State,
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SmallVectorImpl<CCValAssign> &RVLocs,
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const SmallVectorImpl<ArgT> &Args) {
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AnalyzeRetResult(State, Args);
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// Reverse splitted return values to get the "big endian" format required
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// to agree with the calling convention ABI.
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std::reverse(RVLocs.begin(), RVLocs.end());
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MSP430TargetLowering::LowerFormalArguments(SDValue Chain,
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CallingConv::ID CallConv,
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const SmallVectorImpl<ISD::InputArg>
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SmallVectorImpl<SDValue> &InVals)
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llvm_unreachable("Unsupported calling convention");
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case CallingConv::Fast:
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return LowerCCCArguments(Chain, CallConv, isVarArg, Ins, dl, DAG, InVals);
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case CallingConv::MSP430_INTR:
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report_fatal_error("ISRs cannot have arguments");
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MSP430TargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
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SmallVectorImpl<SDValue> &InVals) const {
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SelectionDAG &DAG = CLI.DAG;
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SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
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SmallVectorImpl<SDValue> &OutVals = CLI.OutVals;
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SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins;
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SDValue Chain = CLI.Chain;
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SDValue Callee = CLI.Callee;
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bool &isTailCall = CLI.IsTailCall;
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CallingConv::ID CallConv = CLI.CallConv;
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bool isVarArg = CLI.IsVarArg;
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// MSP430 target does not yet support tail call optimization.
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llvm_unreachable("Unsupported calling convention");
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case CallingConv::Fast:
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return LowerCCCCallTo(Chain, Callee, CallConv, isVarArg, isTailCall,
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Outs, OutVals, Ins, dl, DAG, InVals);
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case CallingConv::MSP430_INTR:
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report_fatal_error("ISRs cannot be called directly");
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/// LowerCCCArguments - transform physical registers into virtual registers and
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/// generate load operations for arguments places on the stack.
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// FIXME: struct return stuff
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MSP430TargetLowering::LowerCCCArguments(SDValue Chain,
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CallingConv::ID CallConv,
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const SmallVectorImpl<ISD::InputArg>
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SmallVectorImpl<SDValue> &InVals)
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MachineFunction &MF = DAG.getMachineFunction();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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MachineRegisterInfo &RegInfo = MF.getRegInfo();
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MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
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// Assign locations to all of the incoming arguments.
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SmallVector<CCValAssign, 16> ArgLocs;
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CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
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AnalyzeArguments(CCInfo, ArgLocs, Ins);
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// Create frame index for the start of the first vararg value
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unsigned Offset = CCInfo.getNextStackOffset();
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FuncInfo->setVarArgsFrameIndex(MFI->CreateFixedObject(1, Offset, true));
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for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
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CCValAssign &VA = ArgLocs[i];
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// Arguments passed in registers
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EVT RegVT = VA.getLocVT();
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switch (RegVT.getSimpleVT().SimpleTy) {
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errs() << "LowerFormalArguments Unhandled argument type: "
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<< RegVT.getSimpleVT().SimpleTy << "\n";
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llvm_unreachable(nullptr);
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unsigned VReg = RegInfo.createVirtualRegister(&MSP430::GR16RegClass);
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RegInfo.addLiveIn(VA.getLocReg(), VReg);
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SDValue ArgValue = DAG.getCopyFromReg(Chain, dl, VReg, RegVT);
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// If this is an 8-bit value, it is really passed promoted to 16
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// bits. Insert an assert[sz]ext to capture this, then truncate to the
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if (VA.getLocInfo() == CCValAssign::SExt)
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ArgValue = DAG.getNode(ISD::AssertSext, dl, RegVT, ArgValue,
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DAG.getValueType(VA.getValVT()));
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else if (VA.getLocInfo() == CCValAssign::ZExt)
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ArgValue = DAG.getNode(ISD::AssertZext, dl, RegVT, ArgValue,
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DAG.getValueType(VA.getValVT()));
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if (VA.getLocInfo() != CCValAssign::Full)
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ArgValue = DAG.getNode(ISD::TRUNCATE, dl, VA.getValVT(), ArgValue);
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InVals.push_back(ArgValue);
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assert(VA.isMemLoc());
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ISD::ArgFlagsTy Flags = Ins[i].Flags;
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if (Flags.isByVal()) {
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int FI = MFI->CreateFixedObject(Flags.getByValSize(),
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VA.getLocMemOffset(), true);
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InVal = DAG.getFrameIndex(FI, getPointerTy(DAG.getDataLayout()));
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// Load the argument to a virtual register
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unsigned ObjSize = VA.getLocVT().getSizeInBits()/8;
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errs() << "LowerFormalArguments Unhandled argument type: "
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<< EVT(VA.getLocVT()).getEVTString()
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// Create the frame index object for this incoming parameter...
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int FI = MFI->CreateFixedObject(ObjSize, VA.getLocMemOffset(), true);
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// Create the SelectionDAG nodes corresponding to a load
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//from this parameter
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SDValue FIN = DAG.getFrameIndex(FI, MVT::i16);
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InVal = DAG.getLoad(VA.getLocVT(), dl, Chain, FIN,
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MachinePointerInfo::getFixedStack(FI),
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false, false, false, 0);
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InVals.push_back(InVal);
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MSP430TargetLowering::LowerReturn(SDValue Chain,
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CallingConv::ID CallConv, bool isVarArg,
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const SmallVectorImpl<ISD::OutputArg> &Outs,
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const SmallVectorImpl<SDValue> &OutVals,
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SDLoc dl, SelectionDAG &DAG) const {
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// CCValAssign - represent the assignment of the return value to a location
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SmallVector<CCValAssign, 16> RVLocs;
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// ISRs cannot return any value.
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if (CallConv == CallingConv::MSP430_INTR && !Outs.empty())
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report_fatal_error("ISRs cannot return any value");
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// CCState - Info about the registers and stack slot.
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CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
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// Analize return values.
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AnalyzeReturnValues(CCInfo, RVLocs, Outs);
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SmallVector<SDValue, 4> RetOps(1, Chain);
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// Copy the result values into the output registers.
548
for (unsigned i = 0; i != RVLocs.size(); ++i) {
549
CCValAssign &VA = RVLocs[i];
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assert(VA.isRegLoc() && "Can only return in registers!");
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Chain = DAG.getCopyToReg(Chain, dl, VA.getLocReg(),
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// Guarantee that all emitted copies are stuck together,
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// avoiding something bad.
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Flag = Chain.getValue(1);
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RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
561
unsigned Opc = (CallConv == CallingConv::MSP430_INTR ?
562
MSP430ISD::RETI_FLAG : MSP430ISD::RET_FLAG);
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RetOps[0] = Chain; // Update chain.
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// Add the flag if we have it.
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RetOps.push_back(Flag);
570
return DAG.getNode(Opc, dl, MVT::Other, RetOps);
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/// LowerCCCCallTo - functions arguments are copied from virtual regs to
574
/// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
577
MSP430TargetLowering::LowerCCCCallTo(SDValue Chain, SDValue Callee,
578
CallingConv::ID CallConv, bool isVarArg,
580
const SmallVectorImpl<ISD::OutputArg>
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const SmallVectorImpl<SDValue> &OutVals,
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const SmallVectorImpl<ISD::InputArg> &Ins,
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SDLoc dl, SelectionDAG &DAG,
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SmallVectorImpl<SDValue> &InVals) const {
586
// Analyze operands of the call, assigning locations to each operand.
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SmallVector<CCValAssign, 16> ArgLocs;
588
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), ArgLocs,
590
AnalyzeArguments(CCInfo, ArgLocs, Outs);
592
// Get a count of how many bytes are to be pushed on the stack.
593
unsigned NumBytes = CCInfo.getNextStackOffset();
594
auto PtrVT = getPointerTy(DAG.getDataLayout());
596
Chain = DAG.getCALLSEQ_START(Chain,
597
DAG.getConstant(NumBytes, dl, PtrVT, true), dl);
599
SmallVector<std::pair<unsigned, SDValue>, 4> RegsToPass;
600
SmallVector<SDValue, 12> MemOpChains;
603
// Walk the register/memloc assignments, inserting copies/loads.
604
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
605
CCValAssign &VA = ArgLocs[i];
607
SDValue Arg = OutVals[i];
609
// Promote the value if needed.
610
switch (VA.getLocInfo()) {
611
default: llvm_unreachable("Unknown loc info!");
612
case CCValAssign::Full: break;
613
case CCValAssign::SExt:
614
Arg = DAG.getNode(ISD::SIGN_EXTEND, dl, VA.getLocVT(), Arg);
616
case CCValAssign::ZExt:
617
Arg = DAG.getNode(ISD::ZERO_EXTEND, dl, VA.getLocVT(), Arg);
619
case CCValAssign::AExt:
620
Arg = DAG.getNode(ISD::ANY_EXTEND, dl, VA.getLocVT(), Arg);
624
// Arguments that can be passed on register must be kept at RegsToPass
627
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
629
assert(VA.isMemLoc());
631
if (!StackPtr.getNode())
632
StackPtr = DAG.getCopyFromReg(Chain, dl, MSP430::SP, PtrVT);
635
DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr,
636
DAG.getIntPtrConstant(VA.getLocMemOffset(), dl));
639
ISD::ArgFlagsTy Flags = Outs[i].Flags;
641
if (Flags.isByVal()) {
642
SDValue SizeNode = DAG.getConstant(Flags.getByValSize(), dl, MVT::i16);
643
MemOp = DAG.getMemcpy(Chain, dl, PtrOff, Arg, SizeNode,
644
Flags.getByValAlign(),
646
/*AlwaysInline=*/true,
647
/*isTailCall=*/false,
648
MachinePointerInfo(),
649
MachinePointerInfo());
651
MemOp = DAG.getStore(Chain, dl, Arg, PtrOff, MachinePointerInfo(),
655
MemOpChains.push_back(MemOp);
659
// Transform all store nodes into one single node because all store nodes are
660
// independent of each other.
661
if (!MemOpChains.empty())
662
Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, MemOpChains);
664
// Build a sequence of copy-to-reg nodes chained together with token chain and
665
// flag operands which copy the outgoing args into registers. The InFlag in
666
// necessary since all emitted instructions must be stuck together.
668
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
669
Chain = DAG.getCopyToReg(Chain, dl, RegsToPass[i].first,
670
RegsToPass[i].second, InFlag);
671
InFlag = Chain.getValue(1);
674
// If the callee is a GlobalAddress node (quite common, every direct call is)
675
// turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
676
// Likewise ExternalSymbol -> TargetExternalSymbol.
677
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
678
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), dl, MVT::i16);
679
else if (ExternalSymbolSDNode *E = dyn_cast<ExternalSymbolSDNode>(Callee))
680
Callee = DAG.getTargetExternalSymbol(E->getSymbol(), MVT::i16);
682
// Returns a chain & a flag for retval copy to use.
683
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
684
SmallVector<SDValue, 8> Ops;
685
Ops.push_back(Chain);
686
Ops.push_back(Callee);
688
// Add argument registers to the end of the list so that they are
689
// known live into the call.
690
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
691
Ops.push_back(DAG.getRegister(RegsToPass[i].first,
692
RegsToPass[i].second.getValueType()));
694
if (InFlag.getNode())
695
Ops.push_back(InFlag);
697
Chain = DAG.getNode(MSP430ISD::CALL, dl, NodeTys, Ops);
698
InFlag = Chain.getValue(1);
700
// Create the CALLSEQ_END node.
701
Chain = DAG.getCALLSEQ_END(Chain, DAG.getConstant(NumBytes, dl, PtrVT, true),
702
DAG.getConstant(0, dl, PtrVT, true), InFlag, dl);
703
InFlag = Chain.getValue(1);
705
// Handle result values, copying them out of physregs into vregs that we
707
return LowerCallResult(Chain, InFlag, CallConv, isVarArg, Ins, dl,
711
/// LowerCallResult - Lower the result values of a call into the
712
/// appropriate copies out of appropriate physical registers.
715
MSP430TargetLowering::LowerCallResult(SDValue Chain, SDValue InFlag,
716
CallingConv::ID CallConv, bool isVarArg,
717
const SmallVectorImpl<ISD::InputArg> &Ins,
718
SDLoc dl, SelectionDAG &DAG,
719
SmallVectorImpl<SDValue> &InVals) const {
721
// Assign locations to each value returned by this call.
722
SmallVector<CCValAssign, 16> RVLocs;
723
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(), RVLocs,
726
AnalyzeReturnValues(CCInfo, RVLocs, Ins);
728
// Copy all of the result registers out of their specified physreg.
729
for (unsigned i = 0; i != RVLocs.size(); ++i) {
730
Chain = DAG.getCopyFromReg(Chain, dl, RVLocs[i].getLocReg(),
731
RVLocs[i].getValVT(), InFlag).getValue(1);
732
InFlag = Chain.getValue(2);
733
InVals.push_back(Chain.getValue(0));
739
SDValue MSP430TargetLowering::LowerShifts(SDValue Op,
740
SelectionDAG &DAG) const {
741
unsigned Opc = Op.getOpcode();
742
SDNode* N = Op.getNode();
743
EVT VT = Op.getValueType();
746
// Expand non-constant shifts to loops:
747
if (!isa<ConstantSDNode>(N->getOperand(1)))
749
default: llvm_unreachable("Invalid shift opcode!");
751
return DAG.getNode(MSP430ISD::SHL, dl,
752
VT, N->getOperand(0), N->getOperand(1));
754
return DAG.getNode(MSP430ISD::SRA, dl,
755
VT, N->getOperand(0), N->getOperand(1));
757
return DAG.getNode(MSP430ISD::SRL, dl,
758
VT, N->getOperand(0), N->getOperand(1));
761
uint64_t ShiftAmount = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue();
763
// Expand the stuff into sequence of shifts.
764
// FIXME: for some shift amounts this might be done better!
765
// E.g.: foo >> (8 + N) => sxt(swpb(foo)) >> N
766
SDValue Victim = N->getOperand(0);
768
if (Opc == ISD::SRL && ShiftAmount) {
769
// Emit a special goodness here:
770
// srl A, 1 => clrc; rrc A
771
Victim = DAG.getNode(MSP430ISD::RRC, dl, VT, Victim);
775
while (ShiftAmount--)
776
Victim = DAG.getNode((Opc == ISD::SHL ? MSP430ISD::RLA : MSP430ISD::RRA),
782
SDValue MSP430TargetLowering::LowerGlobalAddress(SDValue Op,
783
SelectionDAG &DAG) const {
784
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
785
int64_t Offset = cast<GlobalAddressSDNode>(Op)->getOffset();
786
auto PtrVT = getPointerTy(DAG.getDataLayout());
788
// Create the TargetGlobalAddress node, folding in the constant offset.
789
SDValue Result = DAG.getTargetGlobalAddress(GV, SDLoc(Op), PtrVT, Offset);
790
return DAG.getNode(MSP430ISD::Wrapper, SDLoc(Op), PtrVT, Result);
793
SDValue MSP430TargetLowering::LowerExternalSymbol(SDValue Op,
794
SelectionDAG &DAG) const {
796
const char *Sym = cast<ExternalSymbolSDNode>(Op)->getSymbol();
797
auto PtrVT = getPointerTy(DAG.getDataLayout());
798
SDValue Result = DAG.getTargetExternalSymbol(Sym, PtrVT);
800
return DAG.getNode(MSP430ISD::Wrapper, dl, PtrVT, Result);
803
SDValue MSP430TargetLowering::LowerBlockAddress(SDValue Op,
804
SelectionDAG &DAG) const {
806
auto PtrVT = getPointerTy(DAG.getDataLayout());
807
const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
808
SDValue Result = DAG.getTargetBlockAddress(BA, PtrVT);
810
return DAG.getNode(MSP430ISD::Wrapper, dl, PtrVT, Result);
813
static SDValue EmitCMP(SDValue &LHS, SDValue &RHS, SDValue &TargetCC,
815
SDLoc dl, SelectionDAG &DAG) {
816
// FIXME: Handle bittests someday
817
assert(!LHS.getValueType().isFloatingPoint() && "We don't handle FP yet");
819
// FIXME: Handle jump negative someday
820
MSP430CC::CondCodes TCC = MSP430CC::COND_INVALID;
822
default: llvm_unreachable("Invalid integer condition!");
824
TCC = MSP430CC::COND_E; // aka COND_Z
825
// Minor optimization: if LHS is a constant, swap operands, then the
826
// constant can be folded into comparison.
827
if (LHS.getOpcode() == ISD::Constant)
831
TCC = MSP430CC::COND_NE; // aka COND_NZ
832
// Minor optimization: if LHS is a constant, swap operands, then the
833
// constant can be folded into comparison.
834
if (LHS.getOpcode() == ISD::Constant)
838
std::swap(LHS, RHS); // FALLTHROUGH
840
// Turn lhs u>= rhs with lhs constant into rhs u< lhs+1, this allows us to
841
// fold constant into instruction.
842
if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
844
RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0));
845
TCC = MSP430CC::COND_LO;
848
TCC = MSP430CC::COND_HS; // aka COND_C
851
std::swap(LHS, RHS); // FALLTHROUGH
853
// Turn lhs u< rhs with lhs constant into rhs u>= lhs+1, this allows us to
854
// fold constant into instruction.
855
if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
857
RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0));
858
TCC = MSP430CC::COND_HS;
861
TCC = MSP430CC::COND_LO; // aka COND_NC
864
std::swap(LHS, RHS); // FALLTHROUGH
866
// Turn lhs >= rhs with lhs constant into rhs < lhs+1, this allows us to
867
// fold constant into instruction.
868
if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
870
RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0));
871
TCC = MSP430CC::COND_L;
874
TCC = MSP430CC::COND_GE;
877
std::swap(LHS, RHS); // FALLTHROUGH
879
// Turn lhs < rhs with lhs constant into rhs >= lhs+1, this allows us to
880
// fold constant into instruction.
881
if (const ConstantSDNode * C = dyn_cast<ConstantSDNode>(LHS)) {
883
RHS = DAG.getConstant(C->getSExtValue() + 1, dl, C->getValueType(0));
884
TCC = MSP430CC::COND_GE;
887
TCC = MSP430CC::COND_L;
891
TargetCC = DAG.getConstant(TCC, dl, MVT::i8);
892
return DAG.getNode(MSP430ISD::CMP, dl, MVT::Glue, LHS, RHS);
896
SDValue MSP430TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
897
SDValue Chain = Op.getOperand(0);
898
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
899
SDValue LHS = Op.getOperand(2);
900
SDValue RHS = Op.getOperand(3);
901
SDValue Dest = Op.getOperand(4);
905
SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
907
return DAG.getNode(MSP430ISD::BR_CC, dl, Op.getValueType(),
908
Chain, Dest, TargetCC, Flag);
911
SDValue MSP430TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
912
SDValue LHS = Op.getOperand(0);
913
SDValue RHS = Op.getOperand(1);
916
// If we are doing an AND and testing against zero, then the CMP
917
// will not be generated. The AND (or BIT) will generate the condition codes,
918
// but they are different from CMP.
919
// FIXME: since we're doing a post-processing, use a pseudoinstr here, so
920
// lowering & isel wouldn't diverge.
922
if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS)) {
923
if (RHSC->isNullValue() && LHS.hasOneUse() &&
924
(LHS.getOpcode() == ISD::AND ||
925
(LHS.getOpcode() == ISD::TRUNCATE &&
926
LHS.getOperand(0).getOpcode() == ISD::AND))) {
930
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
932
SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
934
// Get the condition codes directly from the status register, if its easy.
935
// Otherwise a branch will be generated. Note that the AND and BIT
936
// instructions generate different flags than CMP, the carry bit can be used
941
switch (cast<ConstantSDNode>(TargetCC)->getZExtValue()) {
945
case MSP430CC::COND_HS:
946
// Res = SR & 1, no processing is required
948
case MSP430CC::COND_LO:
952
case MSP430CC::COND_NE:
954
// C = ~Z, thus Res = SR & 1, no processing is required
956
// Res = ~((SR >> 1) & 1)
961
case MSP430CC::COND_E:
963
// C = ~Z for AND instruction, thus we can put Res = ~(SR & 1), however,
964
// Res = (SR >> 1) & 1 is 1 word shorter.
967
EVT VT = Op.getValueType();
968
SDValue One = DAG.getConstant(1, dl, VT);
970
SDValue SR = DAG.getCopyFromReg(DAG.getEntryNode(), dl, MSP430::SR,
973
// FIXME: somewhere this is turned into a SRL, lower it MSP specific?
974
SR = DAG.getNode(ISD::SRA, dl, MVT::i16, SR, One);
975
SR = DAG.getNode(ISD::AND, dl, MVT::i16, SR, One);
977
SR = DAG.getNode(ISD::XOR, dl, MVT::i16, SR, One);
980
SDValue Zero = DAG.getConstant(0, dl, VT);
981
SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
982
SDValue Ops[] = {One, Zero, TargetCC, Flag};
983
return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, Ops);
987
SDValue MSP430TargetLowering::LowerSELECT_CC(SDValue Op,
988
SelectionDAG &DAG) const {
989
SDValue LHS = Op.getOperand(0);
990
SDValue RHS = Op.getOperand(1);
991
SDValue TrueV = Op.getOperand(2);
992
SDValue FalseV = Op.getOperand(3);
993
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
997
SDValue Flag = EmitCMP(LHS, RHS, TargetCC, CC, dl, DAG);
999
SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::Glue);
1000
SDValue Ops[] = {TrueV, FalseV, TargetCC, Flag};
1002
return DAG.getNode(MSP430ISD::SELECT_CC, dl, VTs, Ops);
1005
SDValue MSP430TargetLowering::LowerSIGN_EXTEND(SDValue Op,
1006
SelectionDAG &DAG) const {
1007
SDValue Val = Op.getOperand(0);
1008
EVT VT = Op.getValueType();
1011
assert(VT == MVT::i16 && "Only support i16 for now!");
1013
return DAG.getNode(ISD::SIGN_EXTEND_INREG, dl, VT,
1014
DAG.getNode(ISD::ANY_EXTEND, dl, VT, Val),
1015
DAG.getValueType(Val.getValueType()));
1019
MSP430TargetLowering::getReturnAddressFrameIndex(SelectionDAG &DAG) const {
1020
MachineFunction &MF = DAG.getMachineFunction();
1021
MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
1022
int ReturnAddrIndex = FuncInfo->getRAIndex();
1023
auto PtrVT = getPointerTy(MF.getDataLayout());
1025
if (ReturnAddrIndex == 0) {
1026
// Set up a frame object for the return address.
1027
uint64_t SlotSize = MF.getDataLayout().getPointerSize();
1028
ReturnAddrIndex = MF.getFrameInfo()->CreateFixedObject(SlotSize, -SlotSize,
1030
FuncInfo->setRAIndex(ReturnAddrIndex);
1033
return DAG.getFrameIndex(ReturnAddrIndex, PtrVT);
1036
SDValue MSP430TargetLowering::LowerRETURNADDR(SDValue Op,
1037
SelectionDAG &DAG) const {
1038
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
1039
MFI->setReturnAddressIsTaken(true);
1041
if (verifyReturnAddressArgumentIsConstant(Op, DAG))
1044
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1046
auto PtrVT = getPointerTy(DAG.getDataLayout());
1049
SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
1051
DAG.getConstant(DAG.getDataLayout().getPointerSize(), dl, MVT::i16);
1052
return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(),
1053
DAG.getNode(ISD::ADD, dl, PtrVT, FrameAddr, Offset),
1054
MachinePointerInfo(), false, false, false, 0);
1057
// Just load the return address.
1058
SDValue RetAddrFI = getReturnAddressFrameIndex(DAG);
1059
return DAG.getLoad(PtrVT, dl, DAG.getEntryNode(), RetAddrFI,
1060
MachinePointerInfo(), false, false, false, 0);
1063
SDValue MSP430TargetLowering::LowerFRAMEADDR(SDValue Op,
1064
SelectionDAG &DAG) const {
1065
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
1066
MFI->setFrameAddressIsTaken(true);
1068
EVT VT = Op.getValueType();
1069
SDLoc dl(Op); // FIXME probably not meaningful
1070
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
1071
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), dl,
1074
FrameAddr = DAG.getLoad(VT, dl, DAG.getEntryNode(), FrameAddr,
1075
MachinePointerInfo(),
1076
false, false, false, 0);
1080
SDValue MSP430TargetLowering::LowerVASTART(SDValue Op,
1081
SelectionDAG &DAG) const {
1082
MachineFunction &MF = DAG.getMachineFunction();
1083
MSP430MachineFunctionInfo *FuncInfo = MF.getInfo<MSP430MachineFunctionInfo>();
1084
auto PtrVT = getPointerTy(DAG.getDataLayout());
1086
// Frame index of first vararg argument
1087
SDValue FrameIndex =
1088
DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(), PtrVT);
1089
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
1091
// Create a store of the frame index to the location operand
1092
return DAG.getStore(Op.getOperand(0), SDLoc(Op), FrameIndex,
1093
Op.getOperand(1), MachinePointerInfo(SV),
1097
SDValue MSP430TargetLowering::LowerJumpTable(SDValue Op,
1098
SelectionDAG &DAG) const {
1099
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
1100
auto PtrVT = getPointerTy(DAG.getDataLayout());
1101
SDValue Result = DAG.getTargetJumpTable(JT->getIndex(), PtrVT);
1102
return DAG.getNode(MSP430ISD::Wrapper, SDLoc(JT), PtrVT, Result);
1105
/// getPostIndexedAddressParts - returns true by value, base pointer and
1106
/// offset pointer and addressing mode by reference if this node can be
1107
/// combined with a load / store to form a post-indexed load / store.
1108
bool MSP430TargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
1111
ISD::MemIndexedMode &AM,
1112
SelectionDAG &DAG) const {
1114
LoadSDNode *LD = cast<LoadSDNode>(N);
1115
if (LD->getExtensionType() != ISD::NON_EXTLOAD)
1118
EVT VT = LD->getMemoryVT();
1119
if (VT != MVT::i8 && VT != MVT::i16)
1122
if (Op->getOpcode() != ISD::ADD)
1125
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Op->getOperand(1))) {
1126
uint64_t RHSC = RHS->getZExtValue();
1127
if ((VT == MVT::i16 && RHSC != 2) ||
1128
(VT == MVT::i8 && RHSC != 1))
1131
Base = Op->getOperand(0);
1132
Offset = DAG.getConstant(RHSC, SDLoc(N), VT);
1141
const char *MSP430TargetLowering::getTargetNodeName(unsigned Opcode) const {
1142
switch ((MSP430ISD::NodeType)Opcode) {
1143
case MSP430ISD::FIRST_NUMBER: break;
1144
case MSP430ISD::RET_FLAG: return "MSP430ISD::RET_FLAG";
1145
case MSP430ISD::RETI_FLAG: return "MSP430ISD::RETI_FLAG";
1146
case MSP430ISD::RRA: return "MSP430ISD::RRA";
1147
case MSP430ISD::RLA: return "MSP430ISD::RLA";
1148
case MSP430ISD::RRC: return "MSP430ISD::RRC";
1149
case MSP430ISD::CALL: return "MSP430ISD::CALL";
1150
case MSP430ISD::Wrapper: return "MSP430ISD::Wrapper";
1151
case MSP430ISD::BR_CC: return "MSP430ISD::BR_CC";
1152
case MSP430ISD::CMP: return "MSP430ISD::CMP";
1153
case MSP430ISD::SETCC: return "MSP430ISD::SETCC";
1154
case MSP430ISD::SELECT_CC: return "MSP430ISD::SELECT_CC";
1155
case MSP430ISD::SHL: return "MSP430ISD::SHL";
1156
case MSP430ISD::SRA: return "MSP430ISD::SRA";
1157
case MSP430ISD::SRL: return "MSP430ISD::SRL";
1162
bool MSP430TargetLowering::isTruncateFree(Type *Ty1,
1164
if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
1167
return (Ty1->getPrimitiveSizeInBits() > Ty2->getPrimitiveSizeInBits());
1170
bool MSP430TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
1171
if (!VT1.isInteger() || !VT2.isInteger())
1174
return (VT1.getSizeInBits() > VT2.getSizeInBits());
1177
bool MSP430TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const {
1178
// MSP430 implicitly zero-extends 8-bit results in 16-bit registers.
1179
return 0 && Ty1->isIntegerTy(8) && Ty2->isIntegerTy(16);
1182
bool MSP430TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
1183
// MSP430 implicitly zero-extends 8-bit results in 16-bit registers.
1184
return 0 && VT1 == MVT::i8 && VT2 == MVT::i16;
1187
bool MSP430TargetLowering::isZExtFree(SDValue Val, EVT VT2) const {
1188
return isZExtFree(Val.getValueType(), VT2);
1191
//===----------------------------------------------------------------------===//
1192
// Other Lowering Code
1193
//===----------------------------------------------------------------------===//
1196
MSP430TargetLowering::EmitShiftInstr(MachineInstr *MI,
1197
MachineBasicBlock *BB) const {
1198
MachineFunction *F = BB->getParent();
1199
MachineRegisterInfo &RI = F->getRegInfo();
1200
DebugLoc dl = MI->getDebugLoc();
1201
const TargetInstrInfo &TII = *F->getSubtarget().getInstrInfo();
1204
const TargetRegisterClass * RC;
1205
switch (MI->getOpcode()) {
1206
default: llvm_unreachable("Invalid shift opcode!");
1208
Opc = MSP430::SHL8r1;
1209
RC = &MSP430::GR8RegClass;
1212
Opc = MSP430::SHL16r1;
1213
RC = &MSP430::GR16RegClass;
1216
Opc = MSP430::SAR8r1;
1217
RC = &MSP430::GR8RegClass;
1220
Opc = MSP430::SAR16r1;
1221
RC = &MSP430::GR16RegClass;
1224
Opc = MSP430::SAR8r1c;
1225
RC = &MSP430::GR8RegClass;
1228
Opc = MSP430::SAR16r1c;
1229
RC = &MSP430::GR16RegClass;
1233
const BasicBlock *LLVM_BB = BB->getBasicBlock();
1234
MachineFunction::iterator I = BB;
1237
// Create loop block
1238
MachineBasicBlock *LoopBB = F->CreateMachineBasicBlock(LLVM_BB);
1239
MachineBasicBlock *RemBB = F->CreateMachineBasicBlock(LLVM_BB);
1241
F->insert(I, LoopBB);
1242
F->insert(I, RemBB);
1244
// Update machine-CFG edges by transferring all successors of the current
1245
// block to the block containing instructions after shift.
1246
RemBB->splice(RemBB->begin(), BB, std::next(MachineBasicBlock::iterator(MI)),
1248
RemBB->transferSuccessorsAndUpdatePHIs(BB);
1250
// Add adges BB => LoopBB => RemBB, BB => RemBB, LoopBB => LoopBB
1251
BB->addSuccessor(LoopBB);
1252
BB->addSuccessor(RemBB);
1253
LoopBB->addSuccessor(RemBB);
1254
LoopBB->addSuccessor(LoopBB);
1256
unsigned ShiftAmtReg = RI.createVirtualRegister(&MSP430::GR8RegClass);
1257
unsigned ShiftAmtReg2 = RI.createVirtualRegister(&MSP430::GR8RegClass);
1258
unsigned ShiftReg = RI.createVirtualRegister(RC);
1259
unsigned ShiftReg2 = RI.createVirtualRegister(RC);
1260
unsigned ShiftAmtSrcReg = MI->getOperand(2).getReg();
1261
unsigned SrcReg = MI->getOperand(1).getReg();
1262
unsigned DstReg = MI->getOperand(0).getReg();
1267
BuildMI(BB, dl, TII.get(MSP430::CMP8ri))
1268
.addReg(ShiftAmtSrcReg).addImm(0);
1269
BuildMI(BB, dl, TII.get(MSP430::JCC))
1271
.addImm(MSP430CC::COND_E);
1274
// ShiftReg = phi [%SrcReg, BB], [%ShiftReg2, LoopBB]
1275
// ShiftAmt = phi [%N, BB], [%ShiftAmt2, LoopBB]
1276
// ShiftReg2 = shift ShiftReg
1277
// ShiftAmt2 = ShiftAmt - 1;
1278
BuildMI(LoopBB, dl, TII.get(MSP430::PHI), ShiftReg)
1279
.addReg(SrcReg).addMBB(BB)
1280
.addReg(ShiftReg2).addMBB(LoopBB);
1281
BuildMI(LoopBB, dl, TII.get(MSP430::PHI), ShiftAmtReg)
1282
.addReg(ShiftAmtSrcReg).addMBB(BB)
1283
.addReg(ShiftAmtReg2).addMBB(LoopBB);
1284
BuildMI(LoopBB, dl, TII.get(Opc), ShiftReg2)
1286
BuildMI(LoopBB, dl, TII.get(MSP430::SUB8ri), ShiftAmtReg2)
1287
.addReg(ShiftAmtReg).addImm(1);
1288
BuildMI(LoopBB, dl, TII.get(MSP430::JCC))
1290
.addImm(MSP430CC::COND_NE);
1293
// DestReg = phi [%SrcReg, BB], [%ShiftReg, LoopBB]
1294
BuildMI(*RemBB, RemBB->begin(), dl, TII.get(MSP430::PHI), DstReg)
1295
.addReg(SrcReg).addMBB(BB)
1296
.addReg(ShiftReg2).addMBB(LoopBB);
1298
MI->eraseFromParent(); // The pseudo instruction is gone now.
1303
MSP430TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
1304
MachineBasicBlock *BB) const {
1305
unsigned Opc = MI->getOpcode();
1307
if (Opc == MSP430::Shl8 || Opc == MSP430::Shl16 ||
1308
Opc == MSP430::Sra8 || Opc == MSP430::Sra16 ||
1309
Opc == MSP430::Srl8 || Opc == MSP430::Srl16)
1310
return EmitShiftInstr(MI, BB);
1312
const TargetInstrInfo &TII = *BB->getParent()->getSubtarget().getInstrInfo();
1313
DebugLoc dl = MI->getDebugLoc();
1315
assert((Opc == MSP430::Select16 || Opc == MSP430::Select8) &&
1316
"Unexpected instr type to insert");
1318
// To "insert" a SELECT instruction, we actually have to insert the diamond
1319
// control-flow pattern. The incoming instruction knows the destination vreg
1320
// to set, the condition code register to branch on, the true/false values to
1321
// select between, and a branch opcode to use.
1322
const BasicBlock *LLVM_BB = BB->getBasicBlock();
1323
MachineFunction::iterator I = BB;
1329
// cmpTY ccX, r1, r2
1331
// fallthrough --> copy0MBB
1332
MachineBasicBlock *thisMBB = BB;
1333
MachineFunction *F = BB->getParent();
1334
MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
1335
MachineBasicBlock *copy1MBB = F->CreateMachineBasicBlock(LLVM_BB);
1336
F->insert(I, copy0MBB);
1337
F->insert(I, copy1MBB);
1338
// Update machine-CFG edges by transferring all successors of the current
1339
// block to the new block which will contain the Phi node for the select.
1340
copy1MBB->splice(copy1MBB->begin(), BB,
1341
std::next(MachineBasicBlock::iterator(MI)), BB->end());
1342
copy1MBB->transferSuccessorsAndUpdatePHIs(BB);
1343
// Next, add the true and fallthrough blocks as its successors.
1344
BB->addSuccessor(copy0MBB);
1345
BB->addSuccessor(copy1MBB);
1347
BuildMI(BB, dl, TII.get(MSP430::JCC))
1349
.addImm(MI->getOperand(3).getImm());
1352
// %FalseValue = ...
1353
// # fallthrough to copy1MBB
1356
// Update machine-CFG edges
1357
BB->addSuccessor(copy1MBB);
1360
// %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
1363
BuildMI(*BB, BB->begin(), dl, TII.get(MSP430::PHI),
1364
MI->getOperand(0).getReg())
1365
.addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
1366
.addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
1368
MI->eraseFromParent(); // The pseudo instruction is gone now.