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-rw-r--r--lib/Target/Alpha/AlphaISelDAGToDAG.cpp425
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diff --git a/lib/Target/Alpha/AlphaISelDAGToDAG.cpp b/lib/Target/Alpha/AlphaISelDAGToDAG.cpp
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--- a/lib/Target/Alpha/AlphaISelDAGToDAG.cpp
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-//===-- AlphaISelDAGToDAG.cpp - Alpha pattern matching inst selector ------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines a pattern matching instruction selector for Alpha,
-// converting from a legalized dag to a Alpha dag.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Alpha.h"
-#include "AlphaTargetMachine.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
-#include "llvm/CodeGen/MachineFrameInfo.h"
-#include "llvm/CodeGen/MachineFunction.h"
-#include "llvm/CodeGen/MachineRegisterInfo.h"
-#include "llvm/CodeGen/SelectionDAG.h"
-#include "llvm/CodeGen/SelectionDAGISel.h"
-#include "llvm/Target/TargetOptions.h"
-#include "llvm/Constants.h"
-#include "llvm/DerivedTypes.h"
-#include "llvm/GlobalValue.h"
-#include "llvm/Intrinsics.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Support/Compiler.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/MathExtras.h"
-#include "llvm/Support/raw_ostream.h"
-#include <algorithm>
-using namespace llvm;
-
-namespace {
-
- //===--------------------------------------------------------------------===//
- /// AlphaDAGToDAGISel - Alpha specific code to select Alpha machine
- /// instructions for SelectionDAG operations.
- class AlphaDAGToDAGISel : public SelectionDAGISel {
- static const int64_t IMM_LOW = -32768;
- static const int64_t IMM_HIGH = 32767;
- static const int64_t IMM_MULT = 65536;
- static const int64_t IMM_FULLHIGH = IMM_HIGH + IMM_HIGH * IMM_MULT;
- static const int64_t IMM_FULLLOW = IMM_LOW + IMM_LOW * IMM_MULT;
-
- static int64_t get_ldah16(int64_t x) {
- int64_t y = x / IMM_MULT;
- if (x % IMM_MULT > IMM_HIGH)
- ++y;
- return y;
- }
-
- static int64_t get_lda16(int64_t x) {
- return x - get_ldah16(x) * IMM_MULT;
- }
-
- /// get_zapImm - Return a zap mask if X is a valid immediate for a zapnot
- /// instruction (if not, return 0). Note that this code accepts partial
- /// zap masks. For example (and LHS, 1) is a valid zap, as long we know
- /// that the bits 1-7 of LHS are already zero. If LHS is non-null, we are
- /// in checking mode. If LHS is null, we assume that the mask has already
- /// been validated before.
- uint64_t get_zapImm(SDValue LHS, uint64_t Constant) const {
- uint64_t BitsToCheck = 0;
- unsigned Result = 0;
- for (unsigned i = 0; i != 8; ++i) {
- if (((Constant >> 8*i) & 0xFF) == 0) {
- // nothing to do.
- } else {
- Result |= 1 << i;
- if (((Constant >> 8*i) & 0xFF) == 0xFF) {
- // If the entire byte is set, zapnot the byte.
- } else if (LHS.getNode() == 0) {
- // Otherwise, if the mask was previously validated, we know its okay
- // to zapnot this entire byte even though all the bits aren't set.
- } else {
- // Otherwise we don't know that the it's okay to zapnot this entire
- // byte. Only do this iff we can prove that the missing bits are
- // already null, so the bytezap doesn't need to really null them.
- BitsToCheck |= ~Constant & (0xFFULL << 8*i);
- }
- }
- }
-
- // If there are missing bits in a byte (for example, X & 0xEF00), check to
- // see if the missing bits (0x1000) are already known zero if not, the zap
- // isn't okay to do, as it won't clear all the required bits.
- if (BitsToCheck &&
- !CurDAG->MaskedValueIsZero(LHS,
- APInt(LHS.getValueSizeInBits(),
- BitsToCheck)))
- return 0;
-
- return Result;
- }
-
- static uint64_t get_zapImm(uint64_t x) {
- unsigned build = 0;
- for(int i = 0; i != 8; ++i) {
- if ((x & 0x00FF) == 0x00FF)
- build |= 1 << i;
- else if ((x & 0x00FF) != 0)
- return 0;
- x >>= 8;
- }
- return build;
- }
-
-
- static uint64_t getNearPower2(uint64_t x) {
- if (!x) return 0;
- unsigned at = CountLeadingZeros_64(x);
- uint64_t complow = 1ULL << (63 - at);
- uint64_t comphigh = complow << 1;
- if (x - complow <= comphigh - x)
- return complow;
- else
- return comphigh;
- }
-
- static bool chkRemNearPower2(uint64_t x, uint64_t r, bool swap) {
- uint64_t y = getNearPower2(x);
- if (swap)
- return (y - x) == r;
- else
- return (x - y) == r;
- }
-
- public:
- explicit AlphaDAGToDAGISel(AlphaTargetMachine &TM)
- : SelectionDAGISel(TM)
- {}
-
- /// getI64Imm - Return a target constant with the specified value, of type
- /// i64.
- inline SDValue getI64Imm(int64_t Imm) {
- return CurDAG->getTargetConstant(Imm, MVT::i64);
- }
-
- // Select - Convert the specified operand from a target-independent to a
- // target-specific node if it hasn't already been changed.
- SDNode *Select(SDNode *N);
-
- virtual const char *getPassName() const {
- return "Alpha DAG->DAG Pattern Instruction Selection";
- }
-
- /// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
- /// inline asm expressions.
- virtual bool SelectInlineAsmMemoryOperand(const SDValue &Op,
- char ConstraintCode,
- std::vector<SDValue> &OutOps) {
- SDValue Op0;
- switch (ConstraintCode) {
- default: return true;
- case 'm': // memory
- Op0 = Op;
- break;
- }
-
- OutOps.push_back(Op0);
- return false;
- }
-
-// Include the pieces autogenerated from the target description.
-#include "AlphaGenDAGISel.inc"
-
-private:
- /// getTargetMachine - Return a reference to the TargetMachine, casted
- /// to the target-specific type.
- const AlphaTargetMachine &getTargetMachine() {
- return static_cast<const AlphaTargetMachine &>(TM);
- }
-
- /// getInstrInfo - Return a reference to the TargetInstrInfo, casted
- /// to the target-specific type.
- const AlphaInstrInfo *getInstrInfo() {
- return getTargetMachine().getInstrInfo();
- }
-
- SDNode *getGlobalBaseReg();
- SDNode *getGlobalRetAddr();
- void SelectCALL(SDNode *Op);
-
- };
-}
-
-/// getGlobalBaseReg - Output the instructions required to put the
-/// GOT address into a register.
-///
-SDNode *AlphaDAGToDAGISel::getGlobalBaseReg() {
- unsigned GlobalBaseReg = getInstrInfo()->getGlobalBaseReg(MF);
- return CurDAG->getRegister(GlobalBaseReg, TLI.getPointerTy()).getNode();
-}
-
-/// getGlobalRetAddr - Grab the return address.
-///
-SDNode *AlphaDAGToDAGISel::getGlobalRetAddr() {
- unsigned GlobalRetAddr = getInstrInfo()->getGlobalRetAddr(MF);
- return CurDAG->getRegister(GlobalRetAddr, TLI.getPointerTy()).getNode();
-}
-
-// Select - Convert the specified operand from a target-independent to a
-// target-specific node if it hasn't already been changed.
-SDNode *AlphaDAGToDAGISel::Select(SDNode *N) {
- if (N->isMachineOpcode())
- return NULL; // Already selected.
- DebugLoc dl = N->getDebugLoc();
-
- switch (N->getOpcode()) {
- default: break;
- case AlphaISD::CALL:
- SelectCALL(N);
- return NULL;
-
- case ISD::FrameIndex: {
- int FI = cast<FrameIndexSDNode>(N)->getIndex();
- return CurDAG->SelectNodeTo(N, Alpha::LDA, MVT::i64,
- CurDAG->getTargetFrameIndex(FI, MVT::i32),
- getI64Imm(0));
- }
- case ISD::GLOBAL_OFFSET_TABLE:
- return getGlobalBaseReg();
- case AlphaISD::GlobalRetAddr:
- return getGlobalRetAddr();
-
- case AlphaISD::DivCall: {
- SDValue Chain = CurDAG->getEntryNode();
- SDValue N0 = N->getOperand(0);
- SDValue N1 = N->getOperand(1);
- SDValue N2 = N->getOperand(2);
- Chain = CurDAG->getCopyToReg(Chain, dl, Alpha::R24, N1,
- SDValue(0,0));
- Chain = CurDAG->getCopyToReg(Chain, dl, Alpha::R25, N2,
- Chain.getValue(1));
- Chain = CurDAG->getCopyToReg(Chain, dl, Alpha::R27, N0,
- Chain.getValue(1));
- SDNode *CNode =
- CurDAG->getMachineNode(Alpha::JSRs, dl, MVT::Other, MVT::Glue,
- Chain, Chain.getValue(1));
- Chain = CurDAG->getCopyFromReg(Chain, dl, Alpha::R27, MVT::i64,
- SDValue(CNode, 1));
- return CurDAG->SelectNodeTo(N, Alpha::BISr, MVT::i64, Chain, Chain);
- }
-
- case ISD::READCYCLECOUNTER: {
- SDValue Chain = N->getOperand(0);
- return CurDAG->getMachineNode(Alpha::RPCC, dl, MVT::i64, MVT::Other,
- Chain);
- }
-
- case ISD::Constant: {
- uint64_t uval = cast<ConstantSDNode>(N)->getZExtValue();
-
- if (uval == 0) {
- SDValue Result = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), dl,
- Alpha::R31, MVT::i64);
- ReplaceUses(SDValue(N, 0), Result);
- return NULL;
- }
-
- int64_t val = (int64_t)uval;
- int32_t val32 = (int32_t)val;
- if (val <= IMM_HIGH + IMM_HIGH * IMM_MULT &&
- val >= IMM_LOW + IMM_LOW * IMM_MULT)
- break; //(LDAH (LDA))
- if ((uval >> 32) == 0 && //empty upper bits
- val32 <= IMM_HIGH + IMM_HIGH * IMM_MULT)
- // val32 >= IMM_LOW + IMM_LOW * IMM_MULT) //always true
- break; //(zext (LDAH (LDA)))
- //Else use the constant pool
- ConstantInt *C = ConstantInt::get(
- Type::getInt64Ty(*CurDAG->getContext()), uval);
- SDValue CPI = CurDAG->getTargetConstantPool(C, MVT::i64);
- SDNode *Tmp = CurDAG->getMachineNode(Alpha::LDAHr, dl, MVT::i64, CPI,
- SDValue(getGlobalBaseReg(), 0));
- return CurDAG->SelectNodeTo(N, Alpha::LDQr, MVT::i64, MVT::Other,
- CPI, SDValue(Tmp, 0), CurDAG->getEntryNode());
- }
- case ISD::TargetConstantFP:
- case ISD::ConstantFP: {
- ConstantFPSDNode *CN = cast<ConstantFPSDNode>(N);
- bool isDouble = N->getValueType(0) == MVT::f64;
- EVT T = isDouble ? MVT::f64 : MVT::f32;
- if (CN->getValueAPF().isPosZero()) {
- return CurDAG->SelectNodeTo(N, isDouble ? Alpha::CPYST : Alpha::CPYSS,
- T, CurDAG->getRegister(Alpha::F31, T),
- CurDAG->getRegister(Alpha::F31, T));
- } else if (CN->getValueAPF().isNegZero()) {
- return CurDAG->SelectNodeTo(N, isDouble ? Alpha::CPYSNT : Alpha::CPYSNS,
- T, CurDAG->getRegister(Alpha::F31, T),
- CurDAG->getRegister(Alpha::F31, T));
- } else {
- report_fatal_error("Unhandled FP constant type");
- }
- break;
- }
-
- case ISD::SETCC:
- if (N->getOperand(0).getNode()->getValueType(0).isFloatingPoint()) {
- ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
-
- unsigned Opc = Alpha::WTF;
- bool rev = false;
- bool inv = false;
- switch(CC) {
- default: DEBUG(N->dump(CurDAG)); llvm_unreachable("Unknown FP comparison!");
- case ISD::SETEQ: case ISD::SETOEQ: case ISD::SETUEQ:
- Opc = Alpha::CMPTEQ; break;
- case ISD::SETLT: case ISD::SETOLT: case ISD::SETULT:
- Opc = Alpha::CMPTLT; break;
- case ISD::SETLE: case ISD::SETOLE: case ISD::SETULE:
- Opc = Alpha::CMPTLE; break;
- case ISD::SETGT: case ISD::SETOGT: case ISD::SETUGT:
- Opc = Alpha::CMPTLT; rev = true; break;
- case ISD::SETGE: case ISD::SETOGE: case ISD::SETUGE:
- Opc = Alpha::CMPTLE; rev = true; break;
- case ISD::SETNE: case ISD::SETONE: case ISD::SETUNE:
- Opc = Alpha::CMPTEQ; inv = true; break;
- case ISD::SETO:
- Opc = Alpha::CMPTUN; inv = true; break;
- case ISD::SETUO:
- Opc = Alpha::CMPTUN; break;
- };
- SDValue tmp1 = N->getOperand(rev?1:0);
- SDValue tmp2 = N->getOperand(rev?0:1);
- SDNode *cmp = CurDAG->getMachineNode(Opc, dl, MVT::f64, tmp1, tmp2);
- if (inv)
- cmp = CurDAG->getMachineNode(Alpha::CMPTEQ, dl,
- MVT::f64, SDValue(cmp, 0),
- CurDAG->getRegister(Alpha::F31, MVT::f64));
- switch(CC) {
- case ISD::SETUEQ: case ISD::SETULT: case ISD::SETULE:
- case ISD::SETUNE: case ISD::SETUGT: case ISD::SETUGE:
- {
- SDNode* cmp2 = CurDAG->getMachineNode(Alpha::CMPTUN, dl, MVT::f64,
- tmp1, tmp2);
- cmp = CurDAG->getMachineNode(Alpha::ADDT, dl, MVT::f64,
- SDValue(cmp2, 0), SDValue(cmp, 0));
- break;
- }
- default: break;
- }
-
- SDNode* LD = CurDAG->getMachineNode(Alpha::FTOIT, dl,
- MVT::i64, SDValue(cmp, 0));
- return CurDAG->getMachineNode(Alpha::CMPULT, dl, MVT::i64,
- CurDAG->getRegister(Alpha::R31, MVT::i64),
- SDValue(LD,0));
- }
- break;
-
- case ISD::AND: {
- ConstantSDNode* SC = NULL;
- ConstantSDNode* MC = NULL;
- if (N->getOperand(0).getOpcode() == ISD::SRL &&
- (MC = dyn_cast<ConstantSDNode>(N->getOperand(1))) &&
- (SC = dyn_cast<ConstantSDNode>(N->getOperand(0).getOperand(1)))) {
- uint64_t sval = SC->getZExtValue();
- uint64_t mval = MC->getZExtValue();
- // If the result is a zap, let the autogened stuff handle it.
- if (get_zapImm(N->getOperand(0), mval))
- break;
- // given mask X, and shift S, we want to see if there is any zap in the
- // mask if we play around with the botton S bits
- uint64_t dontcare = (~0ULL) >> (64 - sval);
- uint64_t mask = mval << sval;
-
- if (get_zapImm(mask | dontcare))
- mask = mask | dontcare;
-
- if (get_zapImm(mask)) {
- SDValue Z =
- SDValue(CurDAG->getMachineNode(Alpha::ZAPNOTi, dl, MVT::i64,
- N->getOperand(0).getOperand(0),
- getI64Imm(get_zapImm(mask))), 0);
- return CurDAG->getMachineNode(Alpha::SRLr, dl, MVT::i64, Z,
- getI64Imm(sval));
- }
- }
- break;
- }
-
- }
-
- return SelectCode(N);
-}
-
-void AlphaDAGToDAGISel::SelectCALL(SDNode *N) {
- //TODO: add flag stuff to prevent nondeturministic breakage!
-
- SDValue Chain = N->getOperand(0);
- SDValue Addr = N->getOperand(1);
- SDValue InFlag = N->getOperand(N->getNumOperands() - 1);
- DebugLoc dl = N->getDebugLoc();
-
- if (Addr.getOpcode() == AlphaISD::GPRelLo) {
- SDValue GOT = SDValue(getGlobalBaseReg(), 0);
- Chain = CurDAG->getCopyToReg(Chain, dl, Alpha::R29, GOT, InFlag);
- InFlag = Chain.getValue(1);
- Chain = SDValue(CurDAG->getMachineNode(Alpha::BSR, dl, MVT::Other,
- MVT::Glue, Addr.getOperand(0),
- Chain, InFlag), 0);
- } else {
- Chain = CurDAG->getCopyToReg(Chain, dl, Alpha::R27, Addr, InFlag);
- InFlag = Chain.getValue(1);
- Chain = SDValue(CurDAG->getMachineNode(Alpha::JSR, dl, MVT::Other,
- MVT::Glue, Chain, InFlag), 0);
- }
- InFlag = Chain.getValue(1);
-
- ReplaceUses(SDValue(N, 0), Chain);
- ReplaceUses(SDValue(N, 1), InFlag);
-}
-
-
-/// createAlphaISelDag - This pass converts a legalized DAG into a
-/// Alpha-specific DAG, ready for instruction scheduling.
-///
-FunctionPass *llvm::createAlphaISelDag(AlphaTargetMachine &TM) {
- return new AlphaDAGToDAGISel(TM);
-}
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