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598 lines
22 KiB
C++
598 lines
22 KiB
C++
//===-- IA64ISelLowering.cpp - IA64 DAG Lowering Implementation -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Duraid Madina and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the IA64ISelLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "IA64ISelLowering.h"
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#include "IA64MachineFunctionInfo.h"
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#include "IA64TargetMachine.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/SelectionDAG.h"
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#include "llvm/CodeGen/SSARegMap.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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using namespace llvm;
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IA64TargetLowering::IA64TargetLowering(TargetMachine &TM)
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: TargetLowering(TM) {
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// register class for general registers
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addRegisterClass(MVT::i64, IA64::GRRegisterClass);
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// register class for FP registers
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addRegisterClass(MVT::f64, IA64::FPRegisterClass);
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// register class for predicate registers
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addRegisterClass(MVT::i1, IA64::PRRegisterClass);
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setLoadXAction(ISD::EXTLOAD , MVT::i1 , Promote);
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setLoadXAction(ISD::ZEXTLOAD , MVT::i1 , Expand);
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setLoadXAction(ISD::SEXTLOAD , MVT::i1 , Expand);
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setLoadXAction(ISD::SEXTLOAD , MVT::i8 , Expand);
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setLoadXAction(ISD::SEXTLOAD , MVT::i16 , Expand);
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setLoadXAction(ISD::SEXTLOAD , MVT::i32 , Expand);
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setOperationAction(ISD::BRIND , MVT::Other, Expand);
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setOperationAction(ISD::BR_JT , MVT::Other, Expand);
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setOperationAction(ISD::BR_CC , MVT::Other, Expand);
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setOperationAction(ISD::FP_ROUND_INREG , MVT::f32 , Expand);
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// ia64 uses SELECT not SELECT_CC
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setOperationAction(ISD::SELECT_CC , MVT::Other, Expand);
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// We need to handle ISD::RET for void functions ourselves,
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// so we get a chance to restore ar.pfs before adding a
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// br.ret insn
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setOperationAction(ISD::RET, MVT::Other, Custom);
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setSetCCResultType(MVT::i1);
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setShiftAmountType(MVT::i64);
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setOperationAction(ISD::FREM , MVT::f32 , Expand);
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setOperationAction(ISD::FREM , MVT::f64 , Expand);
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setOperationAction(ISD::UREM , MVT::f32 , Expand);
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setOperationAction(ISD::UREM , MVT::f64 , Expand);
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setOperationAction(ISD::MEMMOVE , MVT::Other, Expand);
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setOperationAction(ISD::MEMSET , MVT::Other, Expand);
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setOperationAction(ISD::MEMCPY , MVT::Other, Expand);
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setOperationAction(ISD::SINT_TO_FP , MVT::i1 , Promote);
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setOperationAction(ISD::UINT_TO_FP , MVT::i1 , Promote);
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// We don't support sin/cos/sqrt
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setOperationAction(ISD::FSIN , MVT::f64, Expand);
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setOperationAction(ISD::FCOS , MVT::f64, Expand);
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setOperationAction(ISD::FSQRT, MVT::f64, Expand);
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setOperationAction(ISD::FSIN , MVT::f32, Expand);
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setOperationAction(ISD::FCOS , MVT::f32, Expand);
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setOperationAction(ISD::FSQRT, MVT::f32, Expand);
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// FIXME: IA64 supports fcopysign natively!
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setOperationAction(ISD::FCOPYSIGN, MVT::f64, Expand);
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setOperationAction(ISD::FCOPYSIGN, MVT::f32, Expand);
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// We don't have line number support yet.
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setOperationAction(ISD::LOCATION, MVT::Other, Expand);
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setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
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setOperationAction(ISD::LABEL, MVT::Other, Expand);
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//IA64 has these, but they are not implemented
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setOperationAction(ISD::CTTZ , MVT::i64 , Expand);
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setOperationAction(ISD::CTLZ , MVT::i64 , Expand);
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setOperationAction(ISD::ROTL , MVT::i64 , Expand);
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setOperationAction(ISD::ROTR , MVT::i64 , Expand);
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setOperationAction(ISD::BSWAP, MVT::i64 , Expand); // mux @rev
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// VASTART needs to be custom lowered to use the VarArgsFrameIndex
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setOperationAction(ISD::VAARG , MVT::Other, Custom);
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setOperationAction(ISD::VASTART , MVT::Other, Custom);
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// Use the default implementation.
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setOperationAction(ISD::VACOPY , MVT::Other, Expand);
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setOperationAction(ISD::VAEND , MVT::Other, Expand);
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setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
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setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
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setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
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setStackPointerRegisterToSaveRestore(IA64::r12);
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setJumpBufSize(704); // on ia64-linux, jmp_bufs are 704 bytes..
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setJumpBufAlignment(16); // ...and must be 16-byte aligned
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computeRegisterProperties();
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setOperationAction(ISD::ConstantFP, MVT::f64, Expand);
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addLegalFPImmediate(+0.0);
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addLegalFPImmediate(+1.0);
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}
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const char *IA64TargetLowering::getTargetNodeName(unsigned Opcode) const {
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switch (Opcode) {
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default: return 0;
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case IA64ISD::GETFD: return "IA64ISD::GETFD";
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case IA64ISD::BRCALL: return "IA64ISD::BRCALL";
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case IA64ISD::RET_FLAG: return "IA64ISD::RET_FLAG";
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}
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}
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std::vector<SDOperand>
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IA64TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
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std::vector<SDOperand> ArgValues;
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//
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// add beautiful description of IA64 stack frame format
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// here (from intel 24535803.pdf most likely)
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//
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MachineFunction &MF = DAG.getMachineFunction();
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MachineFrameInfo *MFI = MF.getFrameInfo();
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const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
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GP = MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
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SP = MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
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RP = MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
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MachineBasicBlock& BB = MF.front();
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unsigned args_int[] = {IA64::r32, IA64::r33, IA64::r34, IA64::r35,
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IA64::r36, IA64::r37, IA64::r38, IA64::r39};
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unsigned args_FP[] = {IA64::F8, IA64::F9, IA64::F10, IA64::F11,
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IA64::F12,IA64::F13,IA64::F14, IA64::F15};
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unsigned argVreg[8];
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unsigned argPreg[8];
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unsigned argOpc[8];
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unsigned used_FPArgs = 0; // how many FP args have been used so far?
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unsigned ArgOffset = 0;
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int count = 0;
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for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I)
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{
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SDOperand newroot, argt;
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if(count < 8) { // need to fix this logic? maybe.
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switch (getValueType(I->getType())) {
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default:
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assert(0 && "ERROR in LowerArgs: can't lower this type of arg.\n");
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case MVT::f32:
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// fixme? (well, will need to for weird FP structy stuff,
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// see intel ABI docs)
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case MVT::f64:
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//XXX BuildMI(&BB, IA64::IDEF, 0, args_FP[used_FPArgs]);
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MF.addLiveIn(args_FP[used_FPArgs]); // mark this reg as liveIn
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// floating point args go into f8..f15 as-needed, the increment
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argVreg[count] = // is below..:
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MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::f64));
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// FP args go into f8..f15 as needed: (hence the ++)
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argPreg[count] = args_FP[used_FPArgs++];
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argOpc[count] = IA64::FMOV;
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argt = newroot = DAG.getCopyFromReg(DAG.getRoot(), argVreg[count],
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MVT::f64);
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if (I->getType() == Type::FloatTy)
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argt = DAG.getNode(ISD::FP_ROUND, MVT::f32, argt);
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break;
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case MVT::i1: // NOTE: as far as C abi stuff goes,
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// bools are just boring old ints
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case MVT::i8:
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case MVT::i16:
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case MVT::i32:
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case MVT::i64:
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//XXX BuildMI(&BB, IA64::IDEF, 0, args_int[count]);
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MF.addLiveIn(args_int[count]); // mark this register as liveIn
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argVreg[count] =
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MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
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argPreg[count] = args_int[count];
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argOpc[count] = IA64::MOV;
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argt = newroot =
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DAG.getCopyFromReg(DAG.getRoot(), argVreg[count], MVT::i64);
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if ( getValueType(I->getType()) != MVT::i64)
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argt = DAG.getNode(ISD::TRUNCATE, getValueType(I->getType()),
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newroot);
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break;
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}
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} else { // more than 8 args go into the frame
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// Create the frame index object for this incoming parameter...
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ArgOffset = 16 + 8 * (count - 8);
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int FI = MFI->CreateFixedObject(8, ArgOffset);
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// Create the SelectionDAG nodes corresponding to a load
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//from this parameter
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SDOperand FIN = DAG.getFrameIndex(FI, MVT::i64);
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argt = newroot = DAG.getLoad(getValueType(I->getType()),
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DAG.getEntryNode(), FIN, NULL, 0);
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}
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++count;
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DAG.setRoot(newroot.getValue(1));
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ArgValues.push_back(argt);
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}
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// Create a vreg to hold the output of (what will become)
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// the "alloc" instruction
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VirtGPR = MF.getSSARegMap()->createVirtualRegister(getRegClassFor(MVT::i64));
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BuildMI(&BB, TII->get(IA64::PSEUDO_ALLOC), VirtGPR);
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// we create a PSEUDO_ALLOC (pseudo)instruction for now
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/*
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BuildMI(&BB, IA64::IDEF, 0, IA64::r1);
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// hmm:
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BuildMI(&BB, IA64::IDEF, 0, IA64::r12);
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BuildMI(&BB, IA64::IDEF, 0, IA64::rp);
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// ..hmm.
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BuildMI(&BB, IA64::MOV, 1, GP).addReg(IA64::r1);
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// hmm:
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BuildMI(&BB, IA64::MOV, 1, SP).addReg(IA64::r12);
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BuildMI(&BB, IA64::MOV, 1, RP).addReg(IA64::rp);
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// ..hmm.
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*/
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unsigned tempOffset=0;
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// if this is a varargs function, we simply lower llvm.va_start by
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// pointing to the first entry
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if(F.isVarArg()) {
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tempOffset=0;
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VarArgsFrameIndex = MFI->CreateFixedObject(8, tempOffset);
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}
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// here we actually do the moving of args, and store them to the stack
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// too if this is a varargs function:
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for (int i = 0; i < count && i < 8; ++i) {
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BuildMI(&BB, TII->get(argOpc[i]), argVreg[i]).addReg(argPreg[i]);
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if(F.isVarArg()) {
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// if this is a varargs function, we copy the input registers to the stack
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int FI = MFI->CreateFixedObject(8, tempOffset);
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tempOffset+=8; //XXX: is it safe to use r22 like this?
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BuildMI(&BB, TII->get(IA64::MOV), IA64::r22).addFrameIndex(FI);
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// FIXME: we should use st8.spill here, one day
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BuildMI(&BB, TII->get(IA64::ST8), IA64::r22).addReg(argPreg[i]);
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}
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}
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// Finally, inform the code generator which regs we return values in.
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// (see the ISD::RET: case in the instruction selector)
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switch (getValueType(F.getReturnType())) {
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default: assert(0 && "i have no idea where to return this type!");
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case MVT::isVoid: break;
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case MVT::i1:
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case MVT::i8:
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case MVT::i16:
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case MVT::i32:
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case MVT::i64:
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MF.addLiveOut(IA64::r8);
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break;
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case MVT::f32:
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case MVT::f64:
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MF.addLiveOut(IA64::F8);
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break;
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}
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return ArgValues;
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}
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std::pair<SDOperand, SDOperand>
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IA64TargetLowering::LowerCallTo(SDOperand Chain,
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const Type *RetTy, bool RetTyIsSigned,
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bool isVarArg, unsigned CallingConv,
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bool isTailCall, SDOperand Callee,
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ArgListTy &Args, SelectionDAG &DAG) {
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MachineFunction &MF = DAG.getMachineFunction();
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unsigned NumBytes = 16;
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unsigned outRegsUsed = 0;
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if (Args.size() > 8) {
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NumBytes += (Args.size() - 8) * 8;
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outRegsUsed = 8;
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} else {
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outRegsUsed = Args.size();
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}
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// FIXME? this WILL fail if we ever try to pass around an arg that
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// consumes more than a single output slot (a 'real' double, int128
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// some sort of aggregate etc.), as we'll underestimate how many 'outX'
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// registers we use. Hopefully, the assembler will notice.
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MF.getInfo<IA64FunctionInfo>()->outRegsUsed=
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std::max(outRegsUsed, MF.getInfo<IA64FunctionInfo>()->outRegsUsed);
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// keep stack frame 16-byte aligned
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// assert(NumBytes==((NumBytes+15) & ~15) &&
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// "stack frame not 16-byte aligned!");
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NumBytes = (NumBytes+15) & ~15;
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Chain = DAG.getCALLSEQ_START(Chain,DAG.getConstant(NumBytes, getPointerTy()));
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SDOperand StackPtr;
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std::vector<SDOperand> Stores;
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std::vector<SDOperand> Converts;
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std::vector<SDOperand> RegValuesToPass;
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unsigned ArgOffset = 16;
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for (unsigned i = 0, e = Args.size(); i != e; ++i)
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{
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SDOperand Val = Args[i].Node;
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MVT::ValueType ObjectVT = Val.getValueType();
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SDOperand ValToStore(0, 0), ValToConvert(0, 0);
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unsigned ObjSize=8;
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switch (ObjectVT) {
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default: assert(0 && "unexpected argument type!");
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case MVT::i1:
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case MVT::i8:
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case MVT::i16:
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case MVT::i32: {
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//promote to 64-bits, sign/zero extending based on type
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//of the argument
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ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
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if (Args[i].isSExt)
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ExtendKind = ISD::SIGN_EXTEND;
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else if (Args[i].isZExt)
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ExtendKind = ISD::ZERO_EXTEND;
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Val = DAG.getNode(ExtendKind, MVT::i64, Val);
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// XXX: fall through
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}
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case MVT::i64:
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//ObjSize = 8;
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if(RegValuesToPass.size() >= 8) {
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ValToStore = Val;
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} else {
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RegValuesToPass.push_back(Val);
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}
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break;
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case MVT::f32:
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//promote to 64-bits
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Val = DAG.getNode(ISD::FP_EXTEND, MVT::f64, Val);
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// XXX: fall through
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case MVT::f64:
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if(RegValuesToPass.size() >= 8) {
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ValToStore = Val;
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} else {
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RegValuesToPass.push_back(Val);
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if(1 /* TODO: if(calling external or varadic function)*/ ) {
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ValToConvert = Val; // additionally pass this FP value as an int
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}
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}
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break;
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}
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if(ValToStore.Val) {
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if(!StackPtr.Val) {
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StackPtr = DAG.getRegister(IA64::r12, MVT::i64);
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}
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SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
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PtrOff = DAG.getNode(ISD::ADD, MVT::i64, StackPtr, PtrOff);
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Stores.push_back(DAG.getStore(Chain, ValToStore, PtrOff, NULL, 0));
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ArgOffset += ObjSize;
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}
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if(ValToConvert.Val) {
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Converts.push_back(DAG.getNode(IA64ISD::GETFD, MVT::i64, ValToConvert));
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}
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}
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// Emit all stores, make sure they occur before any copies into physregs.
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if (!Stores.empty())
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Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, &Stores[0],Stores.size());
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static const unsigned IntArgRegs[] = {
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IA64::out0, IA64::out1, IA64::out2, IA64::out3,
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IA64::out4, IA64::out5, IA64::out6, IA64::out7
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};
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static const unsigned FPArgRegs[] = {
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IA64::F8, IA64::F9, IA64::F10, IA64::F11,
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IA64::F12, IA64::F13, IA64::F14, IA64::F15
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};
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SDOperand InFlag;
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// save the current GP, SP and RP : FIXME: do we need to do all 3 always?
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SDOperand GPBeforeCall = DAG.getCopyFromReg(Chain, IA64::r1, MVT::i64, InFlag);
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Chain = GPBeforeCall.getValue(1);
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InFlag = Chain.getValue(2);
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SDOperand SPBeforeCall = DAG.getCopyFromReg(Chain, IA64::r12, MVT::i64, InFlag);
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Chain = SPBeforeCall.getValue(1);
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InFlag = Chain.getValue(2);
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SDOperand RPBeforeCall = DAG.getCopyFromReg(Chain, IA64::rp, MVT::i64, InFlag);
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Chain = RPBeforeCall.getValue(1);
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InFlag = Chain.getValue(2);
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// Build a sequence of copy-to-reg nodes chained together with token chain
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// and flag operands which copy the outgoing integer args into regs out[0-7]
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// mapped 1:1 and the FP args into regs F8-F15 "lazily"
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// TODO: for performance, we should only copy FP args into int regs when we
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// know this is required (i.e. for varardic or external (unknown) functions)
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// first to the FP->(integer representation) conversions, these are
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// flagged for now, but shouldn't have to be (TODO)
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unsigned seenConverts = 0;
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for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
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if(MVT::isFloatingPoint(RegValuesToPass[i].getValueType())) {
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Chain = DAG.getCopyToReg(Chain, IntArgRegs[i], Converts[seenConverts++],
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InFlag);
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InFlag = Chain.getValue(1);
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|
}
|
|
}
|
|
|
|
// next copy args into the usual places, these are flagged
|
|
unsigned usedFPArgs = 0;
|
|
for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
|
|
Chain = DAG.getCopyToReg(Chain,
|
|
MVT::isInteger(RegValuesToPass[i].getValueType()) ?
|
|
IntArgRegs[i] : FPArgRegs[usedFPArgs++], RegValuesToPass[i], 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.
|
|
/*
|
|
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
|
|
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i64);
|
|
}
|
|
*/
|
|
|
|
std::vector<MVT::ValueType> NodeTys;
|
|
std::vector<SDOperand> CallOperands;
|
|
NodeTys.push_back(MVT::Other); // Returns a chain
|
|
NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
|
|
CallOperands.push_back(Chain);
|
|
CallOperands.push_back(Callee);
|
|
|
|
// emit the call itself
|
|
if (InFlag.Val)
|
|
CallOperands.push_back(InFlag);
|
|
else
|
|
assert(0 && "this should never happen!\n");
|
|
|
|
// to make way for a hack:
|
|
Chain = DAG.getNode(IA64ISD::BRCALL, NodeTys,
|
|
&CallOperands[0], CallOperands.size());
|
|
InFlag = Chain.getValue(1);
|
|
|
|
// restore the GP, SP and RP after the call
|
|
Chain = DAG.getCopyToReg(Chain, IA64::r1, GPBeforeCall, InFlag);
|
|
InFlag = Chain.getValue(1);
|
|
Chain = DAG.getCopyToReg(Chain, IA64::r12, SPBeforeCall, InFlag);
|
|
InFlag = Chain.getValue(1);
|
|
Chain = DAG.getCopyToReg(Chain, IA64::rp, RPBeforeCall, InFlag);
|
|
InFlag = Chain.getValue(1);
|
|
|
|
std::vector<MVT::ValueType> RetVals;
|
|
RetVals.push_back(MVT::Other);
|
|
RetVals.push_back(MVT::Flag);
|
|
|
|
MVT::ValueType RetTyVT = getValueType(RetTy);
|
|
SDOperand RetVal;
|
|
if (RetTyVT != MVT::isVoid) {
|
|
switch (RetTyVT) {
|
|
default: assert(0 && "Unknown value type to return!");
|
|
case MVT::i1: { // bools are just like other integers (returned in r8)
|
|
// we *could* fall through to the truncate below, but this saves a
|
|
// few redundant predicate ops
|
|
SDOperand boolInR8 = DAG.getCopyFromReg(Chain, IA64::r8, MVT::i64,InFlag);
|
|
InFlag = boolInR8.getValue(2);
|
|
Chain = boolInR8.getValue(1);
|
|
SDOperand zeroReg = DAG.getCopyFromReg(Chain, IA64::r0, MVT::i64, InFlag);
|
|
InFlag = zeroReg.getValue(2);
|
|
Chain = zeroReg.getValue(1);
|
|
|
|
RetVal = DAG.getSetCC(MVT::i1, boolInR8, zeroReg, ISD::SETNE);
|
|
break;
|
|
}
|
|
case MVT::i8:
|
|
case MVT::i16:
|
|
case MVT::i32:
|
|
RetVal = DAG.getCopyFromReg(Chain, IA64::r8, MVT::i64, InFlag);
|
|
Chain = RetVal.getValue(1);
|
|
|
|
// keep track of whether it is sign or zero extended (todo: bools?)
|
|
/* XXX
|
|
RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext,
|
|
MVT::i64, RetVal, DAG.getValueType(RetTyVT));
|
|
*/
|
|
RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
|
|
break;
|
|
case MVT::i64:
|
|
RetVal = DAG.getCopyFromReg(Chain, IA64::r8, MVT::i64, InFlag);
|
|
Chain = RetVal.getValue(1);
|
|
InFlag = RetVal.getValue(2); // XXX dead
|
|
break;
|
|
case MVT::f32:
|
|
RetVal = DAG.getCopyFromReg(Chain, IA64::F8, MVT::f64, InFlag);
|
|
Chain = RetVal.getValue(1);
|
|
RetVal = DAG.getNode(ISD::TRUNCATE, MVT::f32, RetVal);
|
|
break;
|
|
case MVT::f64:
|
|
RetVal = DAG.getCopyFromReg(Chain, IA64::F8, MVT::f64, InFlag);
|
|
Chain = RetVal.getValue(1);
|
|
InFlag = RetVal.getValue(2); // XXX dead
|
|
break;
|
|
}
|
|
}
|
|
|
|
Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
|
|
DAG.getConstant(NumBytes, getPointerTy()));
|
|
|
|
return std::make_pair(RetVal, Chain);
|
|
}
|
|
|
|
SDOperand IA64TargetLowering::
|
|
LowerOperation(SDOperand Op, SelectionDAG &DAG) {
|
|
switch (Op.getOpcode()) {
|
|
default: assert(0 && "Should not custom lower this!");
|
|
case ISD::RET: {
|
|
SDOperand AR_PFSVal, Copy;
|
|
|
|
switch(Op.getNumOperands()) {
|
|
default:
|
|
assert(0 && "Do not know how to return this many arguments!");
|
|
abort();
|
|
case 1:
|
|
AR_PFSVal = DAG.getCopyFromReg(Op.getOperand(0), VirtGPR, MVT::i64);
|
|
AR_PFSVal = DAG.getCopyToReg(AR_PFSVal.getValue(1), IA64::AR_PFS,
|
|
AR_PFSVal);
|
|
return DAG.getNode(IA64ISD::RET_FLAG, MVT::Other, AR_PFSVal);
|
|
case 3: {
|
|
// Copy the result into the output register & restore ar.pfs
|
|
MVT::ValueType ArgVT = Op.getOperand(1).getValueType();
|
|
unsigned ArgReg = MVT::isInteger(ArgVT) ? IA64::r8 : IA64::F8;
|
|
|
|
AR_PFSVal = DAG.getCopyFromReg(Op.getOperand(0), VirtGPR, MVT::i64);
|
|
Copy = DAG.getCopyToReg(AR_PFSVal.getValue(1), ArgReg, Op.getOperand(1),
|
|
SDOperand());
|
|
AR_PFSVal = DAG.getCopyToReg(Copy.getValue(0), IA64::AR_PFS, AR_PFSVal,
|
|
Copy.getValue(1));
|
|
return DAG.getNode(IA64ISD::RET_FLAG, MVT::Other,
|
|
AR_PFSVal, AR_PFSVal.getValue(1));
|
|
}
|
|
}
|
|
return SDOperand();
|
|
}
|
|
case ISD::VAARG: {
|
|
MVT::ValueType VT = getPointerTy();
|
|
SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
|
|
SDOperand VAList = DAG.getLoad(VT, Op.getOperand(0), Op.getOperand(1),
|
|
SV->getValue(), SV->getOffset());
|
|
// Increment the pointer, VAList, to the next vaarg
|
|
SDOperand VAIncr = DAG.getNode(ISD::ADD, VT, VAList,
|
|
DAG.getConstant(MVT::getSizeInBits(VT)/8,
|
|
VT));
|
|
// Store the incremented VAList to the legalized pointer
|
|
VAIncr = DAG.getStore(VAList.getValue(1), VAIncr,
|
|
Op.getOperand(1), SV->getValue(), SV->getOffset());
|
|
// Load the actual argument out of the pointer VAList
|
|
return DAG.getLoad(Op.getValueType(), VAIncr, VAList, NULL, 0);
|
|
}
|
|
case ISD::VASTART: {
|
|
// vastart just stores the address of the VarArgsFrameIndex slot into the
|
|
// memory location argument.
|
|
SDOperand FR = DAG.getFrameIndex(VarArgsFrameIndex, MVT::i64);
|
|
SrcValueSDNode *SV = cast<SrcValueSDNode>(Op.getOperand(2));
|
|
return DAG.getStore(Op.getOperand(0), FR,
|
|
Op.getOperand(1), SV->getValue(), SV->getOffset());
|
|
}
|
|
// Frame & Return address. Currently unimplemented
|
|
case ISD::RETURNADDR: break;
|
|
case ISD::FRAMEADDR: break;
|
|
}
|
|
return SDOperand();
|
|
}
|