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https://github.com/c64scene-ar/llvm-6502.git
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The last patch corrected some issues, but constant-pool entries had actual codegen bugs in the large memory model (which MCJIT uses). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187126 91177308-0d34-0410-b5e6-96231b3b80d8
560 lines
20 KiB
C++
560 lines
20 KiB
C++
//===-- AArch64ISelDAGToDAG.cpp - A dag to dag inst selector for AArch64 --===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//===----------------------------------------------------------------------===//
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//
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// This file defines an instruction selector for the AArch64 target.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "aarch64-isel"
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#include "AArch64.h"
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#include "AArch64InstrInfo.h"
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#include "AArch64Subtarget.h"
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#include "AArch64TargetMachine.h"
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#include "Utils/AArch64BaseInfo.h"
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#include "llvm/ADT/APSInt.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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//===--------------------------------------------------------------------===//
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/// AArch64 specific code to select AArch64 machine instructions for
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/// SelectionDAG operations.
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///
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namespace {
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class AArch64DAGToDAGISel : public SelectionDAGISel {
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AArch64TargetMachine &TM;
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/// Keep a pointer to the AArch64Subtarget around so that we can
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/// make the right decision when generating code for different targets.
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const AArch64Subtarget *Subtarget;
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public:
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explicit AArch64DAGToDAGISel(AArch64TargetMachine &tm,
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CodeGenOpt::Level OptLevel)
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: SelectionDAGISel(tm, OptLevel), TM(tm),
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Subtarget(&TM.getSubtarget<AArch64Subtarget>()) {
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}
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virtual const char *getPassName() const {
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return "AArch64 Instruction Selection";
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}
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// Include the pieces autogenerated from the target description.
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#include "AArch64GenDAGISel.inc"
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template<unsigned MemSize>
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bool SelectOffsetUImm12(SDValue N, SDValue &UImm12) {
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const ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N);
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if (!CN || CN->getZExtValue() % MemSize != 0
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|| CN->getZExtValue() / MemSize > 0xfff)
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return false;
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UImm12 = CurDAG->getTargetConstant(CN->getZExtValue() / MemSize, MVT::i64);
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return true;
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}
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template<unsigned RegWidth>
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bool SelectCVTFixedPosOperand(SDValue N, SDValue &FixedPos) {
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return SelectCVTFixedPosOperand(N, FixedPos, RegWidth);
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}
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/// Used for pre-lowered address-reference nodes, so we already know
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/// the fields match. This operand's job is simply to add an
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/// appropriate shift operand to the MOVZ/MOVK instruction.
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template<unsigned LogShift>
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bool SelectMOVWAddressRef(SDValue N, SDValue &Imm, SDValue &Shift) {
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Imm = N;
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Shift = CurDAG->getTargetConstant(LogShift, MVT::i32);
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return true;
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}
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bool SelectFPZeroOperand(SDValue N, SDValue &Dummy);
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bool SelectCVTFixedPosOperand(SDValue N, SDValue &FixedPos,
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unsigned RegWidth);
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bool SelectInlineAsmMemoryOperand(const SDValue &Op,
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char ConstraintCode,
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std::vector<SDValue> &OutOps);
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bool SelectLogicalImm(SDValue N, SDValue &Imm);
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template<unsigned RegWidth>
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bool SelectTSTBOperand(SDValue N, SDValue &FixedPos) {
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return SelectTSTBOperand(N, FixedPos, RegWidth);
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}
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bool SelectTSTBOperand(SDValue N, SDValue &FixedPos, unsigned RegWidth);
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SDNode *SelectAtomic(SDNode *N, unsigned Op8, unsigned Op16, unsigned Op32,
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unsigned Op64);
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/// Put the given constant into a pool and return a DAG which will give its
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/// address.
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SDValue getConstantPoolItemAddress(SDLoc DL, const Constant *CV);
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SDNode *TrySelectToMoveImm(SDNode *N);
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SDNode *LowerToFPLitPool(SDNode *Node);
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SDNode *SelectToLitPool(SDNode *N);
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SDNode* Select(SDNode*);
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private:
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};
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}
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bool
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AArch64DAGToDAGISel::SelectCVTFixedPosOperand(SDValue N, SDValue &FixedPos,
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unsigned RegWidth) {
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const ConstantFPSDNode *CN = dyn_cast<ConstantFPSDNode>(N);
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if (!CN) return false;
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// An FCVT[SU] instruction performs: convertToInt(Val * 2^fbits) where fbits
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// is between 1 and 32 for a destination w-register, or 1 and 64 for an
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// x-register.
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//
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// By this stage, we've detected (fp_to_[su]int (fmul Val, THIS_NODE)) so we
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// want THIS_NODE to be 2^fbits. This is much easier to deal with using
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// integers.
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bool IsExact;
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// fbits is between 1 and 64 in the worst-case, which means the fmul
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// could have 2^64 as an actual operand. Need 65 bits of precision.
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APSInt IntVal(65, true);
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CN->getValueAPF().convertToInteger(IntVal, APFloat::rmTowardZero, &IsExact);
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// N.b. isPowerOf2 also checks for > 0.
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if (!IsExact || !IntVal.isPowerOf2()) return false;
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unsigned FBits = IntVal.logBase2();
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// Checks above should have guaranteed that we haven't lost information in
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// finding FBits, but it must still be in range.
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if (FBits == 0 || FBits > RegWidth) return false;
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FixedPos = CurDAG->getTargetConstant(64 - FBits, MVT::i32);
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return true;
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}
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bool
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AArch64DAGToDAGISel::SelectInlineAsmMemoryOperand(const SDValue &Op,
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char ConstraintCode,
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std::vector<SDValue> &OutOps) {
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switch (ConstraintCode) {
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default: llvm_unreachable("Unrecognised AArch64 memory constraint");
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case 'm':
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// FIXME: more freedom is actually permitted for 'm'. We can go
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// hunting for a base and an offset if we want. Of course, since
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// we don't really know how the operand is going to be used we're
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// probably restricted to the load/store pair's simm7 as an offset
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// range anyway.
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case 'Q':
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OutOps.push_back(Op);
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}
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return false;
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}
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bool
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AArch64DAGToDAGISel::SelectFPZeroOperand(SDValue N, SDValue &Dummy) {
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ConstantFPSDNode *Imm = dyn_cast<ConstantFPSDNode>(N);
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if (!Imm || !Imm->getValueAPF().isPosZero())
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return false;
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// Doesn't actually carry any information, but keeps TableGen quiet.
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Dummy = CurDAG->getTargetConstant(0, MVT::i32);
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return true;
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}
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bool AArch64DAGToDAGISel::SelectLogicalImm(SDValue N, SDValue &Imm) {
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uint32_t Bits;
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uint32_t RegWidth = N.getValueType().getSizeInBits();
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ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N);
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if (!CN) return false;
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if (!A64Imms::isLogicalImm(RegWidth, CN->getZExtValue(), Bits))
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return false;
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Imm = CurDAG->getTargetConstant(Bits, MVT::i32);
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return true;
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}
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SDNode *AArch64DAGToDAGISel::TrySelectToMoveImm(SDNode *Node) {
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SDNode *ResNode;
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SDLoc dl(Node);
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EVT DestType = Node->getValueType(0);
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unsigned DestWidth = DestType.getSizeInBits();
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unsigned MOVOpcode;
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EVT MOVType;
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int UImm16, Shift;
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uint32_t LogicalBits;
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uint64_t BitPat = cast<ConstantSDNode>(Node)->getZExtValue();
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if (A64Imms::isMOVZImm(DestWidth, BitPat, UImm16, Shift)) {
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MOVType = DestType;
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MOVOpcode = DestWidth == 64 ? AArch64::MOVZxii : AArch64::MOVZwii;
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} else if (A64Imms::isMOVNImm(DestWidth, BitPat, UImm16, Shift)) {
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MOVType = DestType;
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MOVOpcode = DestWidth == 64 ? AArch64::MOVNxii : AArch64::MOVNwii;
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} else if (DestWidth == 64 && A64Imms::isMOVNImm(32, BitPat, UImm16, Shift)) {
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// To get something like 0x0000_0000_ffff_1234 into a 64-bit register we can
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// use a 32-bit instruction: "movn w0, 0xedbc".
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MOVType = MVT::i32;
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MOVOpcode = AArch64::MOVNwii;
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} else if (A64Imms::isLogicalImm(DestWidth, BitPat, LogicalBits)) {
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MOVOpcode = DestWidth == 64 ? AArch64::ORRxxi : AArch64::ORRwwi;
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uint16_t ZR = DestWidth == 64 ? AArch64::XZR : AArch64::WZR;
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return CurDAG->getMachineNode(MOVOpcode, dl, DestType,
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CurDAG->getRegister(ZR, DestType),
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CurDAG->getTargetConstant(LogicalBits, MVT::i32));
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} else {
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// Can't handle it in one instruction. There's scope for permitting two (or
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// more) instructions, but that'll need more thought.
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return NULL;
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}
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ResNode = CurDAG->getMachineNode(MOVOpcode, dl, MOVType,
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CurDAG->getTargetConstant(UImm16, MVT::i32),
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CurDAG->getTargetConstant(Shift, MVT::i32));
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if (MOVType != DestType) {
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ResNode = CurDAG->getMachineNode(TargetOpcode::SUBREG_TO_REG, dl,
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MVT::i64, MVT::i32, MVT::Other,
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CurDAG->getTargetConstant(0, MVT::i64),
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SDValue(ResNode, 0),
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CurDAG->getTargetConstant(AArch64::sub_32, MVT::i32));
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}
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return ResNode;
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}
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SDValue
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AArch64DAGToDAGISel::getConstantPoolItemAddress(SDLoc DL,
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const Constant *CV) {
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EVT PtrVT = getTargetLowering()->getPointerTy();
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switch (getTargetLowering()->getTargetMachine().getCodeModel()) {
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case CodeModel::Small: {
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unsigned Alignment =
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getTargetLowering()->getDataLayout()->getABITypeAlignment(CV->getType());
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return CurDAG->getNode(
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AArch64ISD::WrapperSmall, DL, PtrVT,
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CurDAG->getTargetConstantPool(CV, PtrVT, 0, 0, AArch64II::MO_NO_FLAG),
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CurDAG->getTargetConstantPool(CV, PtrVT, 0, 0, AArch64II::MO_LO12),
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CurDAG->getConstant(Alignment, MVT::i32));
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}
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case CodeModel::Large: {
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SDNode *LitAddr;
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LitAddr = CurDAG->getMachineNode(
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AArch64::MOVZxii, DL, PtrVT,
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CurDAG->getTargetConstantPool(CV, PtrVT, 0, 0, AArch64II::MO_ABS_G3),
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CurDAG->getTargetConstant(3, MVT::i32));
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LitAddr = CurDAG->getMachineNode(
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AArch64::MOVKxii, DL, PtrVT, SDValue(LitAddr, 0),
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CurDAG->getTargetConstantPool(CV, PtrVT, 0, 0, AArch64II::MO_ABS_G2_NC),
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CurDAG->getTargetConstant(2, MVT::i32));
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LitAddr = CurDAG->getMachineNode(
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AArch64::MOVKxii, DL, PtrVT, SDValue(LitAddr, 0),
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CurDAG->getTargetConstantPool(CV, PtrVT, 0, 0, AArch64II::MO_ABS_G1_NC),
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CurDAG->getTargetConstant(1, MVT::i32));
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LitAddr = CurDAG->getMachineNode(
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AArch64::MOVKxii, DL, PtrVT, SDValue(LitAddr, 0),
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CurDAG->getTargetConstantPool(CV, PtrVT, 0, 0, AArch64II::MO_ABS_G0_NC),
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CurDAG->getTargetConstant(0, MVT::i32));
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return SDValue(LitAddr, 0);
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}
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default:
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llvm_unreachable("Only small and large code models supported now");
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}
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}
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SDNode *AArch64DAGToDAGISel::SelectToLitPool(SDNode *Node) {
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SDLoc DL(Node);
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uint64_t UnsignedVal = cast<ConstantSDNode>(Node)->getZExtValue();
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int64_t SignedVal = cast<ConstantSDNode>(Node)->getSExtValue();
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EVT DestType = Node->getValueType(0);
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// Since we may end up loading a 64-bit constant from a 32-bit entry the
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// constant in the pool may have a different type to the eventual node.
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ISD::LoadExtType Extension;
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EVT MemType;
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assert((DestType == MVT::i64 || DestType == MVT::i32)
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&& "Only expect integer constants at the moment");
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if (DestType == MVT::i32) {
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Extension = ISD::NON_EXTLOAD;
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MemType = MVT::i32;
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} else if (UnsignedVal <= UINT32_MAX) {
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Extension = ISD::ZEXTLOAD;
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MemType = MVT::i32;
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} else if (SignedVal >= INT32_MIN && SignedVal <= INT32_MAX) {
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Extension = ISD::SEXTLOAD;
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MemType = MVT::i32;
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} else {
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Extension = ISD::NON_EXTLOAD;
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MemType = MVT::i64;
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}
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Constant *CV = ConstantInt::get(Type::getIntNTy(*CurDAG->getContext(),
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MemType.getSizeInBits()),
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UnsignedVal);
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SDValue PoolAddr = getConstantPoolItemAddress(DL, CV);
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unsigned Alignment =
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getTargetLowering()->getDataLayout()->getABITypeAlignment(CV->getType());
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return CurDAG->getExtLoad(Extension, DL, DestType, CurDAG->getEntryNode(),
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PoolAddr,
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MachinePointerInfo::getConstantPool(), MemType,
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/* isVolatile = */ false,
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/* isNonTemporal = */ false,
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Alignment).getNode();
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}
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SDNode *AArch64DAGToDAGISel::LowerToFPLitPool(SDNode *Node) {
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SDLoc DL(Node);
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const ConstantFP *FV = cast<ConstantFPSDNode>(Node)->getConstantFPValue();
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EVT DestType = Node->getValueType(0);
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unsigned Alignment =
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getTargetLowering()->getDataLayout()->getABITypeAlignment(FV->getType());
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SDValue PoolAddr = getConstantPoolItemAddress(DL, FV);
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return CurDAG->getLoad(DestType, DL, CurDAG->getEntryNode(), PoolAddr,
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MachinePointerInfo::getConstantPool(),
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/* isVolatile = */ false,
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/* isNonTemporal = */ false,
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/* isInvariant = */ true,
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Alignment).getNode();
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}
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bool
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AArch64DAGToDAGISel::SelectTSTBOperand(SDValue N, SDValue &FixedPos,
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unsigned RegWidth) {
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const ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N);
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if (!CN) return false;
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uint64_t Val = CN->getZExtValue();
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if (!isPowerOf2_64(Val)) return false;
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unsigned TestedBit = Log2_64(Val);
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// Checks above should have guaranteed that we haven't lost information in
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// finding TestedBit, but it must still be in range.
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if (TestedBit >= RegWidth) return false;
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FixedPos = CurDAG->getTargetConstant(TestedBit, MVT::i64);
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return true;
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}
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SDNode *AArch64DAGToDAGISel::SelectAtomic(SDNode *Node, unsigned Op8,
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unsigned Op16,unsigned Op32,
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unsigned Op64) {
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// Mostly direct translation to the given operations, except that we preserve
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// the AtomicOrdering for use later on.
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AtomicSDNode *AN = cast<AtomicSDNode>(Node);
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EVT VT = AN->getMemoryVT();
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unsigned Op;
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if (VT == MVT::i8)
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Op = Op8;
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else if (VT == MVT::i16)
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Op = Op16;
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else if (VT == MVT::i32)
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Op = Op32;
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else if (VT == MVT::i64)
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Op = Op64;
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else
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llvm_unreachable("Unexpected atomic operation");
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SmallVector<SDValue, 4> Ops;
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for (unsigned i = 1; i < AN->getNumOperands(); ++i)
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Ops.push_back(AN->getOperand(i));
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Ops.push_back(CurDAG->getTargetConstant(AN->getOrdering(), MVT::i32));
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Ops.push_back(AN->getOperand(0)); // Chain moves to the end
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return CurDAG->SelectNodeTo(Node, Op,
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AN->getValueType(0), MVT::Other,
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&Ops[0], Ops.size());
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}
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SDNode *AArch64DAGToDAGISel::Select(SDNode *Node) {
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// Dump information about the Node being selected
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DEBUG(dbgs() << "Selecting: "; Node->dump(CurDAG); dbgs() << "\n");
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if (Node->isMachineOpcode()) {
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DEBUG(dbgs() << "== "; Node->dump(CurDAG); dbgs() << "\n");
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return NULL;
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}
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switch (Node->getOpcode()) {
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case ISD::ATOMIC_LOAD_ADD:
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return SelectAtomic(Node,
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AArch64::ATOMIC_LOAD_ADD_I8,
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AArch64::ATOMIC_LOAD_ADD_I16,
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AArch64::ATOMIC_LOAD_ADD_I32,
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AArch64::ATOMIC_LOAD_ADD_I64);
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case ISD::ATOMIC_LOAD_SUB:
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return SelectAtomic(Node,
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AArch64::ATOMIC_LOAD_SUB_I8,
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AArch64::ATOMIC_LOAD_SUB_I16,
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AArch64::ATOMIC_LOAD_SUB_I32,
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AArch64::ATOMIC_LOAD_SUB_I64);
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case ISD::ATOMIC_LOAD_AND:
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return SelectAtomic(Node,
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AArch64::ATOMIC_LOAD_AND_I8,
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AArch64::ATOMIC_LOAD_AND_I16,
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AArch64::ATOMIC_LOAD_AND_I32,
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AArch64::ATOMIC_LOAD_AND_I64);
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case ISD::ATOMIC_LOAD_OR:
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return SelectAtomic(Node,
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AArch64::ATOMIC_LOAD_OR_I8,
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AArch64::ATOMIC_LOAD_OR_I16,
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AArch64::ATOMIC_LOAD_OR_I32,
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AArch64::ATOMIC_LOAD_OR_I64);
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case ISD::ATOMIC_LOAD_XOR:
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return SelectAtomic(Node,
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AArch64::ATOMIC_LOAD_XOR_I8,
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AArch64::ATOMIC_LOAD_XOR_I16,
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AArch64::ATOMIC_LOAD_XOR_I32,
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AArch64::ATOMIC_LOAD_XOR_I64);
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case ISD::ATOMIC_LOAD_NAND:
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return SelectAtomic(Node,
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AArch64::ATOMIC_LOAD_NAND_I8,
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AArch64::ATOMIC_LOAD_NAND_I16,
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AArch64::ATOMIC_LOAD_NAND_I32,
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AArch64::ATOMIC_LOAD_NAND_I64);
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case ISD::ATOMIC_LOAD_MIN:
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return SelectAtomic(Node,
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AArch64::ATOMIC_LOAD_MIN_I8,
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AArch64::ATOMIC_LOAD_MIN_I16,
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AArch64::ATOMIC_LOAD_MIN_I32,
|
|
AArch64::ATOMIC_LOAD_MIN_I64);
|
|
case ISD::ATOMIC_LOAD_MAX:
|
|
return SelectAtomic(Node,
|
|
AArch64::ATOMIC_LOAD_MAX_I8,
|
|
AArch64::ATOMIC_LOAD_MAX_I16,
|
|
AArch64::ATOMIC_LOAD_MAX_I32,
|
|
AArch64::ATOMIC_LOAD_MAX_I64);
|
|
case ISD::ATOMIC_LOAD_UMIN:
|
|
return SelectAtomic(Node,
|
|
AArch64::ATOMIC_LOAD_UMIN_I8,
|
|
AArch64::ATOMIC_LOAD_UMIN_I16,
|
|
AArch64::ATOMIC_LOAD_UMIN_I32,
|
|
AArch64::ATOMIC_LOAD_UMIN_I64);
|
|
case ISD::ATOMIC_LOAD_UMAX:
|
|
return SelectAtomic(Node,
|
|
AArch64::ATOMIC_LOAD_UMAX_I8,
|
|
AArch64::ATOMIC_LOAD_UMAX_I16,
|
|
AArch64::ATOMIC_LOAD_UMAX_I32,
|
|
AArch64::ATOMIC_LOAD_UMAX_I64);
|
|
case ISD::ATOMIC_SWAP:
|
|
return SelectAtomic(Node,
|
|
AArch64::ATOMIC_SWAP_I8,
|
|
AArch64::ATOMIC_SWAP_I16,
|
|
AArch64::ATOMIC_SWAP_I32,
|
|
AArch64::ATOMIC_SWAP_I64);
|
|
case ISD::ATOMIC_CMP_SWAP:
|
|
return SelectAtomic(Node,
|
|
AArch64::ATOMIC_CMP_SWAP_I8,
|
|
AArch64::ATOMIC_CMP_SWAP_I16,
|
|
AArch64::ATOMIC_CMP_SWAP_I32,
|
|
AArch64::ATOMIC_CMP_SWAP_I64);
|
|
case ISD::FrameIndex: {
|
|
int FI = cast<FrameIndexSDNode>(Node)->getIndex();
|
|
EVT PtrTy = getTargetLowering()->getPointerTy();
|
|
SDValue TFI = CurDAG->getTargetFrameIndex(FI, PtrTy);
|
|
return CurDAG->SelectNodeTo(Node, AArch64::ADDxxi_lsl0_s, PtrTy,
|
|
TFI, CurDAG->getTargetConstant(0, PtrTy));
|
|
}
|
|
case ISD::ConstantPool: {
|
|
// Constant pools are fine, just create a Target entry.
|
|
ConstantPoolSDNode *CN = cast<ConstantPoolSDNode>(Node);
|
|
const Constant *C = CN->getConstVal();
|
|
SDValue CP = CurDAG->getTargetConstantPool(C, CN->getValueType(0));
|
|
|
|
ReplaceUses(SDValue(Node, 0), CP);
|
|
return NULL;
|
|
}
|
|
case ISD::Constant: {
|
|
SDNode *ResNode = 0;
|
|
if (cast<ConstantSDNode>(Node)->getZExtValue() == 0) {
|
|
// XZR and WZR are probably even better than an actual move: most of the
|
|
// time they can be folded into another instruction with *no* cost.
|
|
|
|
EVT Ty = Node->getValueType(0);
|
|
assert((Ty == MVT::i32 || Ty == MVT::i64) && "unexpected type");
|
|
uint16_t Register = Ty == MVT::i32 ? AArch64::WZR : AArch64::XZR;
|
|
ResNode = CurDAG->getCopyFromReg(CurDAG->getEntryNode(),
|
|
SDLoc(Node),
|
|
Register, Ty).getNode();
|
|
}
|
|
|
|
// Next best option is a move-immediate, see if we can do that.
|
|
if (!ResNode) {
|
|
ResNode = TrySelectToMoveImm(Node);
|
|
}
|
|
|
|
if (ResNode)
|
|
return ResNode;
|
|
|
|
// If even that fails we fall back to a lit-pool entry at the moment. Future
|
|
// tuning may change this to a sequence of MOVZ/MOVN/MOVK instructions.
|
|
ResNode = SelectToLitPool(Node);
|
|
assert(ResNode && "We need *some* way to materialise a constant");
|
|
|
|
// We want to continue selection at this point since the litpool access
|
|
// generated used generic nodes for simplicity.
|
|
ReplaceUses(SDValue(Node, 0), SDValue(ResNode, 0));
|
|
Node = ResNode;
|
|
break;
|
|
}
|
|
case ISD::ConstantFP: {
|
|
if (A64Imms::isFPImm(cast<ConstantFPSDNode>(Node)->getValueAPF())) {
|
|
// FMOV will take care of it from TableGen
|
|
break;
|
|
}
|
|
|
|
SDNode *ResNode = LowerToFPLitPool(Node);
|
|
ReplaceUses(SDValue(Node, 0), SDValue(ResNode, 0));
|
|
|
|
// We want to continue selection at this point since the litpool access
|
|
// generated used generic nodes for simplicity.
|
|
Node = ResNode;
|
|
break;
|
|
}
|
|
default:
|
|
break; // Let generic code handle it
|
|
}
|
|
|
|
SDNode *ResNode = SelectCode(Node);
|
|
|
|
DEBUG(dbgs() << "=> ";
|
|
if (ResNode == NULL || ResNode == Node)
|
|
Node->dump(CurDAG);
|
|
else
|
|
ResNode->dump(CurDAG);
|
|
dbgs() << "\n");
|
|
|
|
return ResNode;
|
|
}
|
|
|
|
/// This pass converts a legalized DAG into a AArch64-specific DAG, ready for
|
|
/// instruction scheduling.
|
|
FunctionPass *llvm::createAArch64ISelDAG(AArch64TargetMachine &TM,
|
|
CodeGenOpt::Level OptLevel) {
|
|
return new AArch64DAGToDAGISel(TM, OptLevel);
|
|
}
|