mirror of
https://github.com/c64scene-ar/llvm-6502.git
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1e559443a1
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96240 91177308-0d34-0410-b5e6-96231b3b80d8
476 lines
18 KiB
C++
476 lines
18 KiB
C++
//===-------- LegalizeTypesGeneric.cpp - Generic type legalization --------===//
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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 implements generic type expansion and splitting for LegalizeTypes.
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// The routines here perform legalization when the details of the type (such as
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// whether it is an integer or a float) do not matter.
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// Expansion is the act of changing a computation in an illegal type to be a
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// computation in two identical registers of a smaller type. The Lo/Hi part
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// is required to be stored first in memory on little/big-endian machines.
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// Splitting is the act of changing a computation in an illegal type to be a
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// computation in two not necessarily identical registers of a smaller type.
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// There are no requirements on how the type is represented in memory.
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//
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//===----------------------------------------------------------------------===//
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#include "LegalizeTypes.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/CodeGen/PseudoSourceValue.h"
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using namespace llvm;
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//===----------------------------------------------------------------------===//
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// Generic Result Expansion.
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//===----------------------------------------------------------------------===//
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// These routines assume that the Lo/Hi part is stored first in memory on
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// little/big-endian machines, followed by the Hi/Lo part. This means that
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// they cannot be used as is on vectors, for which Lo is always stored first.
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void DAGTypeLegalizer::ExpandRes_BIT_CONVERT(SDNode *N, SDValue &Lo,
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SDValue &Hi) {
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EVT OutVT = N->getValueType(0);
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EVT NOutVT = TLI.getTypeToTransformTo(*DAG.getContext(), OutVT);
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SDValue InOp = N->getOperand(0);
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EVT InVT = InOp.getValueType();
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DebugLoc dl = N->getDebugLoc();
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// Handle some special cases efficiently.
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switch (getTypeAction(InVT)) {
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default:
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assert(false && "Unknown type action!");
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case Legal:
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case PromoteInteger:
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break;
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case SoftenFloat:
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// Convert the integer operand instead.
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SplitInteger(GetSoftenedFloat(InOp), Lo, Hi);
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Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
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Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
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return;
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case ExpandInteger:
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case ExpandFloat:
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// Convert the expanded pieces of the input.
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GetExpandedOp(InOp, Lo, Hi);
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Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
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Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
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return;
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case SplitVector:
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GetSplitVector(InOp, Lo, Hi);
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
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Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
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return;
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case ScalarizeVector:
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// Convert the element instead.
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SplitInteger(BitConvertToInteger(GetScalarizedVector(InOp)), Lo, Hi);
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Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
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Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
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return;
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case WidenVector: {
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assert(!(InVT.getVectorNumElements() & 1) && "Unsupported BIT_CONVERT");
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InOp = GetWidenedVector(InOp);
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EVT InNVT = EVT::getVectorVT(*DAG.getContext(), InVT.getVectorElementType(),
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InVT.getVectorNumElements()/2);
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Lo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, InNVT, InOp,
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DAG.getIntPtrConstant(0));
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Hi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, InNVT, InOp,
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DAG.getIntPtrConstant(InNVT.getVectorNumElements()));
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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Lo = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Lo);
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Hi = DAG.getNode(ISD::BIT_CONVERT, dl, NOutVT, Hi);
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return;
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}
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}
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if (InVT.isVector() && OutVT.isInteger()) {
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// Handle cases like i64 = BIT_CONVERT v1i64 on x86, where the operand
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// is legal but the result is not.
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EVT NVT = EVT::getVectorVT(*DAG.getContext(), NOutVT, 2);
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if (isTypeLegal(NVT)) {
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SDValue CastInOp = DAG.getNode(ISD::BIT_CONVERT, dl, NVT, InOp);
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Lo = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NOutVT, CastInOp,
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DAG.getIntPtrConstant(0));
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Hi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NOutVT, CastInOp,
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DAG.getIntPtrConstant(1));
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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return;
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}
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}
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// Lower the bit-convert to a store/load from the stack.
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assert(NOutVT.isByteSized() && "Expanded type not byte sized!");
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// Create the stack frame object. Make sure it is aligned for both
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// the source and expanded destination types.
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unsigned Alignment =
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TLI.getTargetData()->getPrefTypeAlignment(NOutVT.
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getTypeForEVT(*DAG.getContext()));
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SDValue StackPtr = DAG.CreateStackTemporary(InVT, Alignment);
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int SPFI = cast<FrameIndexSDNode>(StackPtr.getNode())->getIndex();
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const Value *SV = PseudoSourceValue::getFixedStack(SPFI);
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// Emit a store to the stack slot.
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SDValue Store = DAG.getStore(DAG.getEntryNode(), dl, InOp, StackPtr, SV, 0,
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false, false, 0);
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// Load the first half from the stack slot.
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Lo = DAG.getLoad(NOutVT, dl, Store, StackPtr, SV, 0, false, false, 0);
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// Increment the pointer to the other half.
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unsigned IncrementSize = NOutVT.getSizeInBits() / 8;
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StackPtr = DAG.getNode(ISD::ADD, dl, StackPtr.getValueType(), StackPtr,
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DAG.getIntPtrConstant(IncrementSize));
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// Load the second half from the stack slot.
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Hi = DAG.getLoad(NOutVT, dl, Store, StackPtr, SV, IncrementSize, false,
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false, MinAlign(Alignment, IncrementSize));
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// Handle endianness of the load.
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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}
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void DAGTypeLegalizer::ExpandRes_BUILD_PAIR(SDNode *N, SDValue &Lo,
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SDValue &Hi) {
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// Return the operands.
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Lo = N->getOperand(0);
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Hi = N->getOperand(1);
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}
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void DAGTypeLegalizer::ExpandRes_EXTRACT_ELEMENT(SDNode *N, SDValue &Lo,
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SDValue &Hi) {
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GetExpandedOp(N->getOperand(0), Lo, Hi);
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SDValue Part = cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ?
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Hi : Lo;
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assert(Part.getValueType() == N->getValueType(0) &&
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"Type twice as big as expanded type not itself expanded!");
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GetPairElements(Part, Lo, Hi);
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}
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void DAGTypeLegalizer::ExpandRes_EXTRACT_VECTOR_ELT(SDNode *N, SDValue &Lo,
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SDValue &Hi) {
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SDValue OldVec = N->getOperand(0);
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unsigned OldElts = OldVec.getValueType().getVectorNumElements();
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DebugLoc dl = N->getDebugLoc();
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// Convert to a vector of the expanded element type, for example
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// <3 x i64> -> <6 x i32>.
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EVT OldVT = N->getValueType(0);
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EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT);
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SDValue NewVec = DAG.getNode(ISD::BIT_CONVERT, dl,
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EVT::getVectorVT(*DAG.getContext(), NewVT, 2*OldElts),
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OldVec);
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// Extract the elements at 2 * Idx and 2 * Idx + 1 from the new vector.
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SDValue Idx = N->getOperand(1);
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// Make sure the type of Idx is big enough to hold the new values.
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if (Idx.getValueType().bitsLT(TLI.getPointerTy()))
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Idx = DAG.getNode(ISD::ZERO_EXTEND, dl, TLI.getPointerTy(), Idx);
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Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx);
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Lo = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx);
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Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx,
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DAG.getConstant(1, Idx.getValueType()));
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Hi = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, NewVT, NewVec, Idx);
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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}
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void DAGTypeLegalizer::ExpandRes_NormalLoad(SDNode *N, SDValue &Lo,
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SDValue &Hi) {
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assert(ISD::isNormalLoad(N) && "This routine only for normal loads!");
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DebugLoc dl = N->getDebugLoc();
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LoadSDNode *LD = cast<LoadSDNode>(N);
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EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), LD->getValueType(0));
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SDValue Chain = LD->getChain();
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SDValue Ptr = LD->getBasePtr();
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int SVOffset = LD->getSrcValueOffset();
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unsigned Alignment = LD->getAlignment();
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bool isVolatile = LD->isVolatile();
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bool isNonTemporal = LD->isNonTemporal();
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assert(NVT.isByteSized() && "Expanded type not byte sized!");
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Lo = DAG.getLoad(NVT, dl, Chain, Ptr, LD->getSrcValue(), SVOffset,
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isVolatile, isNonTemporal, Alignment);
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// Increment the pointer to the other half.
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unsigned IncrementSize = NVT.getSizeInBits() / 8;
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Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
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DAG.getIntPtrConstant(IncrementSize));
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Hi = DAG.getLoad(NVT, dl, Chain, Ptr, LD->getSrcValue(),
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SVOffset+IncrementSize,
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isVolatile, isNonTemporal,
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MinAlign(Alignment, IncrementSize));
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// Build a factor node to remember that this load is independent of the
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// other one.
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Chain = DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo.getValue(1),
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Hi.getValue(1));
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// Handle endianness of the load.
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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// Modified the chain - switch anything that used the old chain to use
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// the new one.
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ReplaceValueWith(SDValue(N, 1), Chain);
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}
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void DAGTypeLegalizer::ExpandRes_VAARG(SDNode *N, SDValue &Lo, SDValue &Hi) {
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EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), N->getValueType(0));
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SDValue Chain = N->getOperand(0);
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SDValue Ptr = N->getOperand(1);
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DebugLoc dl = N->getDebugLoc();
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Lo = DAG.getVAArg(NVT, dl, Chain, Ptr, N->getOperand(2));
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Hi = DAG.getVAArg(NVT, dl, Lo.getValue(1), Ptr, N->getOperand(2));
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// Handle endianness of the load.
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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// Modified the chain - switch anything that used the old chain to use
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// the new one.
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ReplaceValueWith(SDValue(N, 1), Hi.getValue(1));
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}
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//===--------------------------------------------------------------------===//
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// Generic Operand Expansion.
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//===--------------------------------------------------------------------===//
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SDValue DAGTypeLegalizer::ExpandOp_BIT_CONVERT(SDNode *N) {
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DebugLoc dl = N->getDebugLoc();
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if (N->getValueType(0).isVector()) {
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// An illegal expanding type is being converted to a legal vector type.
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// Make a two element vector out of the expanded parts and convert that
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// instead, but only if the new vector type is legal (otherwise there
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// is no point, and it might create expansion loops). For example, on
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// x86 this turns v1i64 = BIT_CONVERT i64 into v1i64 = BIT_CONVERT v2i32.
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EVT OVT = N->getOperand(0).getValueType();
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EVT NVT = EVT::getVectorVT(*DAG.getContext(), TLI.getTypeToTransformTo(*DAG.getContext(), OVT), 2);
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if (isTypeLegal(NVT)) {
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SDValue Parts[2];
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GetExpandedOp(N->getOperand(0), Parts[0], Parts[1]);
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if (TLI.isBigEndian())
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std::swap(Parts[0], Parts[1]);
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SDValue Vec = DAG.getNode(ISD::BUILD_VECTOR, dl, NVT, Parts, 2);
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return DAG.getNode(ISD::BIT_CONVERT, dl, N->getValueType(0), Vec);
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}
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}
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// Otherwise, store to a temporary and load out again as the new type.
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return CreateStackStoreLoad(N->getOperand(0), N->getValueType(0));
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}
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SDValue DAGTypeLegalizer::ExpandOp_BUILD_VECTOR(SDNode *N) {
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// The vector type is legal but the element type needs expansion.
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EVT VecVT = N->getValueType(0);
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unsigned NumElts = VecVT.getVectorNumElements();
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EVT OldVT = N->getOperand(0).getValueType();
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EVT NewVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldVT);
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DebugLoc dl = N->getDebugLoc();
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assert(OldVT == VecVT.getVectorElementType() &&
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"BUILD_VECTOR operand type doesn't match vector element type!");
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// Build a vector of twice the length out of the expanded elements.
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// For example <3 x i64> -> <6 x i32>.
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std::vector<SDValue> NewElts;
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NewElts.reserve(NumElts*2);
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for (unsigned i = 0; i < NumElts; ++i) {
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SDValue Lo, Hi;
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GetExpandedOp(N->getOperand(i), Lo, Hi);
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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NewElts.push_back(Lo);
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NewElts.push_back(Hi);
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}
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SDValue NewVec = DAG.getNode(ISD::BUILD_VECTOR, dl,
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EVT::getVectorVT(*DAG.getContext(), NewVT, NewElts.size()),
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&NewElts[0], NewElts.size());
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// Convert the new vector to the old vector type.
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return DAG.getNode(ISD::BIT_CONVERT, dl, VecVT, NewVec);
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}
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SDValue DAGTypeLegalizer::ExpandOp_EXTRACT_ELEMENT(SDNode *N) {
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SDValue Lo, Hi;
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GetExpandedOp(N->getOperand(0), Lo, Hi);
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return cast<ConstantSDNode>(N->getOperand(1))->getZExtValue() ? Hi : Lo;
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}
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SDValue DAGTypeLegalizer::ExpandOp_INSERT_VECTOR_ELT(SDNode *N) {
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// The vector type is legal but the element type needs expansion.
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EVT VecVT = N->getValueType(0);
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unsigned NumElts = VecVT.getVectorNumElements();
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DebugLoc dl = N->getDebugLoc();
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SDValue Val = N->getOperand(1);
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EVT OldEVT = Val.getValueType();
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EVT NewEVT = TLI.getTypeToTransformTo(*DAG.getContext(), OldEVT);
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assert(OldEVT == VecVT.getVectorElementType() &&
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"Inserted element type doesn't match vector element type!");
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// Bitconvert to a vector of twice the length with elements of the expanded
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// type, insert the expanded vector elements, and then convert back.
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EVT NewVecVT = EVT::getVectorVT(*DAG.getContext(), NewEVT, NumElts*2);
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SDValue NewVec = DAG.getNode(ISD::BIT_CONVERT, dl,
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NewVecVT, N->getOperand(0));
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SDValue Lo, Hi;
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GetExpandedOp(Val, Lo, Hi);
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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SDValue Idx = N->getOperand(2);
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Idx = DAG.getNode(ISD::ADD, dl, Idx.getValueType(), Idx, Idx);
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NewVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Lo, Idx);
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Idx = DAG.getNode(ISD::ADD, dl,
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Idx.getValueType(), Idx, DAG.getIntPtrConstant(1));
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NewVec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, NewVecVT, NewVec, Hi, Idx);
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// Convert the new vector to the old vector type.
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return DAG.getNode(ISD::BIT_CONVERT, dl, VecVT, NewVec);
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}
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SDValue DAGTypeLegalizer::ExpandOp_SCALAR_TO_VECTOR(SDNode *N) {
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DebugLoc dl = N->getDebugLoc();
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EVT VT = N->getValueType(0);
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assert(VT.getVectorElementType() == N->getOperand(0).getValueType() &&
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"SCALAR_TO_VECTOR operand type doesn't match vector element type!");
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unsigned NumElts = VT.getVectorNumElements();
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SmallVector<SDValue, 16> Ops(NumElts);
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Ops[0] = N->getOperand(0);
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SDValue UndefVal = DAG.getUNDEF(Ops[0].getValueType());
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for (unsigned i = 1; i < NumElts; ++i)
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Ops[i] = UndefVal;
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return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &Ops[0], NumElts);
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}
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SDValue DAGTypeLegalizer::ExpandOp_NormalStore(SDNode *N, unsigned OpNo) {
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assert(ISD::isNormalStore(N) && "This routine only for normal stores!");
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assert(OpNo == 1 && "Can only expand the stored value so far");
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DebugLoc dl = N->getDebugLoc();
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StoreSDNode *St = cast<StoreSDNode>(N);
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EVT NVT = TLI.getTypeToTransformTo(*DAG.getContext(), St->getValue().getValueType());
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SDValue Chain = St->getChain();
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SDValue Ptr = St->getBasePtr();
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int SVOffset = St->getSrcValueOffset();
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unsigned Alignment = St->getAlignment();
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bool isVolatile = St->isVolatile();
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bool isNonTemporal = St->isNonTemporal();
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assert(NVT.isByteSized() && "Expanded type not byte sized!");
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unsigned IncrementSize = NVT.getSizeInBits() / 8;
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SDValue Lo, Hi;
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GetExpandedOp(St->getValue(), Lo, Hi);
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if (TLI.isBigEndian())
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std::swap(Lo, Hi);
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Lo = DAG.getStore(Chain, dl, Lo, Ptr, St->getSrcValue(), SVOffset,
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isVolatile, isNonTemporal, Alignment);
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Ptr = DAG.getNode(ISD::ADD, dl, Ptr.getValueType(), Ptr,
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DAG.getIntPtrConstant(IncrementSize));
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assert(isTypeLegal(Ptr.getValueType()) && "Pointers must be legal!");
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Hi = DAG.getStore(Chain, dl, Hi, Ptr, St->getSrcValue(),
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SVOffset + IncrementSize,
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isVolatile, isNonTemporal,
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MinAlign(Alignment, IncrementSize));
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return DAG.getNode(ISD::TokenFactor, dl, MVT::Other, Lo, Hi);
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}
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//===--------------------------------------------------------------------===//
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// Generic Result Splitting.
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//===--------------------------------------------------------------------===//
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// Be careful to make no assumptions about which of Lo/Hi is stored first in
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// memory (for vectors it is always Lo first followed by Hi in the following
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// bytes; for integers and floats it is Lo first if and only if the machine is
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// little-endian).
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void DAGTypeLegalizer::SplitRes_MERGE_VALUES(SDNode *N,
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SDValue &Lo, SDValue &Hi) {
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// A MERGE_VALUES node can produce any number of values. We know that the
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// first illegal one needs to be expanded into Lo/Hi.
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unsigned i;
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// The string of legal results gets turned into input operands, which have
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// the same type.
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for (i = 0; isTypeLegal(N->getValueType(i)); ++i)
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ReplaceValueWith(SDValue(N, i), SDValue(N->getOperand(i)));
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// The first illegal result must be the one that needs to be expanded.
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GetSplitOp(N->getOperand(i), Lo, Hi);
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// Legalize the rest of the results into the input operands whether they are
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// legal or not.
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unsigned e = N->getNumValues();
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for (++i; i != e; ++i)
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ReplaceValueWith(SDValue(N, i), SDValue(N->getOperand(i)));
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}
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void DAGTypeLegalizer::SplitRes_SELECT(SDNode *N, SDValue &Lo,
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SDValue &Hi) {
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SDValue LL, LH, RL, RH;
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DebugLoc dl = N->getDebugLoc();
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GetSplitOp(N->getOperand(1), LL, LH);
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GetSplitOp(N->getOperand(2), RL, RH);
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SDValue Cond = N->getOperand(0);
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Lo = DAG.getNode(ISD::SELECT, dl, LL.getValueType(), Cond, LL, RL);
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Hi = DAG.getNode(ISD::SELECT, dl, LH.getValueType(), Cond, LH, RH);
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}
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void DAGTypeLegalizer::SplitRes_SELECT_CC(SDNode *N, SDValue &Lo,
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SDValue &Hi) {
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SDValue LL, LH, RL, RH;
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DebugLoc dl = N->getDebugLoc();
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GetSplitOp(N->getOperand(2), LL, LH);
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GetSplitOp(N->getOperand(3), RL, RH);
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Lo = DAG.getNode(ISD::SELECT_CC, dl, LL.getValueType(), N->getOperand(0),
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N->getOperand(1), LL, RL, N->getOperand(4));
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Hi = DAG.getNode(ISD::SELECT_CC, dl, LH.getValueType(), N->getOperand(0),
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N->getOperand(1), LH, RH, N->getOperand(4));
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}
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void DAGTypeLegalizer::SplitRes_UNDEF(SDNode *N, SDValue &Lo, SDValue &Hi) {
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EVT LoVT, HiVT;
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GetSplitDestVTs(N->getValueType(0), LoVT, HiVT);
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Lo = DAG.getUNDEF(LoVT);
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Hi = DAG.getUNDEF(HiVT);
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}
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