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BinaryEvaluator.cpp
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BinaryEvaluator.cpp
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/*******************************************************************************
* Copyright (c) 2018, 2021 IBM Corp. and others
*
* This program and the accompanying materials are made available under
* the terms of the Eclipse Public License 2.0 which accompanies this
* distribution and is available at http://eclipse.org/legal/epl-2.0
* or the Apache License, Version 2.0 which accompanies this distribution
* and is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception [1] and GNU General Public
* License, version 2 with the OpenJDK Assembly Exception [2].
*
* [1] https://www.gnu.org/software/classpath/license.html
* [2] http://openjdk.java.net/legal/assembly-exception.html
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
*******************************************************************************/
#include "codegen/ARM64Instruction.hpp"
#include "codegen/ARM64ShiftCode.hpp"
#include "codegen/CodeGenerator.hpp"
#include "codegen/CodeGeneratorUtils.hpp"
#include "codegen/GenerateInstructions.hpp"
#include "codegen/Linkage.hpp"
#include "codegen/RegisterDependency.hpp"
#include "codegen/TreeEvaluator.hpp"
#include "il/AutomaticSymbol.hpp"
#include "il/Node.hpp"
#include "il/Node_inlines.hpp"
#include "infra/Bit.hpp"
/**
* Generic helper that handles a number of similar binary operations.
* @param[in] node : calling node
* @param[in] regOp : the target AArch64 instruction opcode
* @param[in] regOpImm : the matching AArch64 immediate instruction opcode
* regOpImm == regOp indicates that the passed opcode has no immediate form.
* @param[in] cg : codegenerator
* @return target register
*/
static inline TR::Register *
genericBinaryEvaluator(TR::Node *node, TR::InstOpCode::Mnemonic regOp, TR::InstOpCode::Mnemonic regOpImm, bool is64Bit, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *src1Reg = cg->evaluate(firstChild);
TR::Register *src2Reg = NULL;
TR::Register *trgReg = NULL;
int64_t value = 0;
if (node->getOpCodeValue() != TR::aladd)
{
if(1 == firstChild->getReferenceCount())
{
trgReg = src1Reg;
}
else if(1 == secondChild->getReferenceCount() && secondChild->getRegister() != NULL)
{
trgReg = secondChild->getRegister();
}
else
{
trgReg = cg->allocateRegister();
}
}
else
{
/*
* Because trgReg can contain an internal pointer, we cannot use the same virtual register
* for trgReg and sources for aladd except for the case
* where src1Reg also contains an internal pointer and has the same pinning array as the node.
*/
if ((1 == firstChild->getReferenceCount()) && node->isInternalPointer() && src1Reg->containsInternalPointer() &&
(node->getPinningArrayPointer() == src1Reg->getPinningArrayPointer()))
{
trgReg = src1Reg;
}
else
{
trgReg = cg->allocateRegister();
}
}
if (secondChild->getOpCode().isLoadConst() && secondChild->getRegister() == NULL)
{
if(is64Bit)
{
value = secondChild->getLongInt();
}
else
{
value = secondChild->getInt();
}
/* When regOp == regOpImm, an immediate version of the instruction does not exist. */
if(constantIsUnsignedImm12(value) && regOp != regOpImm)
{
generateTrg1Src1ImmInstruction(cg, regOpImm, node, trgReg, src1Reg, value);
}
else if (constantIsUnsignedImm12(-value) &&
(regOpImm == TR::InstOpCode::addimmw || regOpImm == TR::InstOpCode::addimmx ||
regOpImm == TR::InstOpCode::subimmw || regOpImm == TR::InstOpCode::subimmx))
{
TR::InstOpCode::Mnemonic negatedOp;
switch (regOpImm)
{
case TR::InstOpCode::addimmw:
negatedOp = TR::InstOpCode::subimmw;
break;
case TR::InstOpCode::addimmx:
negatedOp = TR::InstOpCode::subimmx;
break;
case TR::InstOpCode::subimmw:
negatedOp = TR::InstOpCode::addimmw;
break;
case TR::InstOpCode::subimmx:
negatedOp = TR::InstOpCode::addimmx;
break;
default:
TR_ASSERT(false, "Unsupported op");
}
generateTrg1Src1ImmInstruction(cg, negatedOp, node, trgReg, src1Reg, -value);
}
else
{
src2Reg = cg->allocateRegister();
if(is64Bit)
{
loadConstant64(cg, node, value, src2Reg);
}
else
{
loadConstant32(cg, node, value, src2Reg);
}
generateTrg1Src2Instruction(cg, regOp, node, trgReg, src1Reg, src2Reg);
cg->stopUsingRegister(src2Reg);
}
}
else
{
src2Reg = cg->evaluate(secondChild);
generateTrg1Src2Instruction(cg, regOp, node, trgReg, src1Reg, src2Reg);
}
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
// multiply and add
// multiply and subtract
static TR::Register *
generateMaddOrMsub(TR::Node *node, TR::Node *mulNode, TR::Node *anotherNode, TR::InstOpCode::Mnemonic op, TR::CodeGenerator *cg)
{
if ((mulNode->getOpCodeValue() == TR::imul || mulNode->getOpCodeValue() == TR::lmul) &&
mulNode->getReferenceCount() == 1 &&
mulNode->getRegister() == NULL)
{
TR::Register *trgReg = cg->allocateRegister();
TR::Register *mulSrc1Reg = cg->evaluate(mulNode->getFirstChild());
TR::Register *mulSrc2Reg = cg->evaluate(mulNode->getSecondChild());
TR::Register *src3Reg = cg->evaluate(anotherNode);
generateTrg1Src3Instruction(cg, op, node, trgReg, mulSrc1Reg, mulSrc2Reg, src3Reg);
node->setRegister(trgReg);
cg->decReferenceCount(mulNode->getFirstChild());
cg->decReferenceCount(mulNode->getSecondChild());
cg->decReferenceCount(mulNode);
cg->decReferenceCount(anotherNode);
return trgReg;
}
else
{
return NULL; // not applicable
}
}
TR::Register *
OMR::ARM64::TreeEvaluator::iaddEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *retReg;
retReg = generateMaddOrMsub(node, firstChild, secondChild, TR::InstOpCode::maddw, cg); // x*y + z
if (retReg)
{
return retReg;
}
retReg = generateMaddOrMsub(node, secondChild, firstChild, TR::InstOpCode::maddw, cg); // x + y*z
if (retReg)
{
return retReg;
}
return genericBinaryEvaluator(node, TR::InstOpCode::addw, TR::InstOpCode::addimmw, false, cg);
}
TR::Register *
OMR::ARM64::TreeEvaluator::laddEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *retReg;
retReg = generateMaddOrMsub(node, firstChild, secondChild, TR::InstOpCode::maddx, cg); // x*y + z
if (retReg)
{
return retReg;
}
retReg = generateMaddOrMsub(node, secondChild, firstChild, TR::InstOpCode::maddx, cg); // x + y*z
if (retReg)
{
return retReg;
}
return genericBinaryEvaluator(node, TR::InstOpCode::addx, TR::InstOpCode::addimmx, true, cg);
}
TR::Register *
OMR::ARM64::TreeEvaluator::isubEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *retReg;
retReg = generateMaddOrMsub(node, secondChild, firstChild, TR::InstOpCode::msubw, cg); // x - y*z
if (retReg)
{
return retReg;
}
return genericBinaryEvaluator(node, TR::InstOpCode::subw, TR::InstOpCode::subimmw, false, cg);
}
TR::Register *
OMR::ARM64::TreeEvaluator::lsubEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *retReg;
retReg = generateMaddOrMsub(node, secondChild, firstChild, TR::InstOpCode::msubx, cg); // x - y*z
if (retReg)
{
return retReg;
}
return genericBinaryEvaluator(node, TR::InstOpCode::subx, TR::InstOpCode::subimmx, true, cg);
}
// vector add
static TR::Register *
inlineVectorBinaryOp(TR::Node *node, TR::CodeGenerator *cg, TR::InstOpCode::Mnemonic op)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *lhsReg = NULL, *rhsReg = NULL;
lhsReg = cg->evaluate(firstChild);
rhsReg = cg->evaluate(secondChild);
TR_ASSERT(lhsReg->getKind() == TR_VRF, "unexpected Register kind\n");
TR_ASSERT(rhsReg->getKind() == TR_VRF, "unexpected Register kind\n");
TR::Register *resReg = cg->allocateRegister(TR_VRF);
node->setRegister(resReg);
generateTrg1Src2Instruction(cg, op, node, resReg, lhsReg, rhsReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return resReg;
}
TR::Register *
OMR::ARM64::TreeEvaluator::vaddEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::InstOpCode::Mnemonic addOp;
switch(node->getDataType())
{
case TR::VectorInt8:
addOp = TR::InstOpCode::vadd16b;
break;
case TR::VectorInt16:
addOp = TR::InstOpCode::vadd8h;
break;
case TR::VectorFloat:
addOp = TR::InstOpCode::vfadd4s;
break;
case TR::VectorDouble:
addOp = TR::InstOpCode::vfadd2d;
break;
default:
TR_ASSERT(false, "unrecognized vector type %s\n", node->getDataType().toString());
return NULL;
}
return inlineVectorBinaryOp(node, cg, addOp);
}
// Multiply a register by a 32-bit constant
static void mulConstant32(TR::Node *node, TR::Register *treg, TR::Register *sreg, int32_t value, TR::CodeGenerator *cg)
{
if (value == 0)
{
loadConstant32(cg, node, 0, treg);
}
else if (value == 1)
{
generateMovInstruction(cg, node, treg, sreg);
}
else if (value == -1)
{
generateNegInstruction(cg, node, treg, sreg);
}
else
{
TR::Register *tmpReg = cg->allocateRegister();
loadConstant32(cg, node, value, tmpReg);
generateMulInstruction(cg, node, treg, sreg, tmpReg);
cg->stopUsingRegister(tmpReg);
}
}
// Multiply a register by a 64-bit constant
static void mulConstant64(TR::Node *node, TR::Register *treg, TR::Register *sreg, int64_t value, TR::CodeGenerator *cg)
{
if (value == 0)
{
loadConstant64(cg, node, 0, treg);
}
else if (value == 1)
{
generateMovInstruction(cg, node, treg, sreg);
}
else if (value == -1)
{
generateNegInstruction(cg, node, treg, sreg);
}
else
{
TR::Register *tmpReg = cg->allocateRegister();
loadConstant64(cg, node, value, tmpReg);
generateMulInstruction(cg, node, treg, sreg, tmpReg);
cg->stopUsingRegister(tmpReg);
}
}
TR::Register *
OMR::ARM64::TreeEvaluator::imulEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *src1Reg = cg->evaluate(firstChild);
TR::Register *src2Reg = NULL;
TR::Register *trgReg = NULL;
int32_t value = 0;
if (secondChild->getOpCode().isLoadConst() && secondChild->getRegister() == NULL)
{
value = secondChild->getInt();
if (value > 0 && cg->convertMultiplyToShift(node))
{
trgReg = cg->evaluate(node);
return trgReg;
}
}
if(1 == firstChild->getReferenceCount())
{
trgReg = src1Reg;
}
else if(1 == secondChild->getReferenceCount() && (src2Reg = secondChild->getRegister()) != NULL)
{
trgReg = src2Reg;
}
else
{
trgReg = cg->allocateRegister();
}
if (secondChild->getOpCode().isLoadConst() && secondChild->getRegister() == NULL)
{
mulConstant32(node, trgReg, src1Reg, value, cg);
}
else
{
TR::Register *src2Reg = cg->evaluate(secondChild);
generateMulInstruction(cg, node, trgReg, src1Reg, src2Reg);
}
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
TR::Register *
OMR::ARM64::TreeEvaluator::imulhEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Register *src1Reg = cg->evaluate(firstChild);
TR::Node *secondChild = node->getSecondChild();
TR::Register *src2Reg;
TR::Register *trgReg = cg->allocateRegister();
TR::Register *tmpReg = NULL;
TR::Register *zeroReg = cg->allocateRegister();
TR::RegisterDependencyConditions *cond = new (cg->trHeapMemory()) TR::RegisterDependencyConditions(1, 1, cg->trMemory());
TR::addDependency(cond, zeroReg, TR::RealRegister::xzr, TR_GPR, cg);
// imulh is generated for constant idiv and the second child is the magic number
// assume magic number is usually a large odd number with little optimization opportunity
if (secondChild->getOpCode().isLoadConst() && secondChild->getRegister() == NULL)
{
int32_t value = secondChild->getInt();
src2Reg = tmpReg = cg->allocateRegister();
loadConstant32(cg, node, value, src2Reg);
}
else
{
src2Reg = cg->evaluate(secondChild);
}
generateTrg1Src3Instruction(cg, TR::InstOpCode::smaddl, node, trgReg, src1Reg, src2Reg, zeroReg, cond);
cg->stopUsingRegister(zeroReg);
/* logical shift right by 32 bits */
uint32_t imm = 0x183F; // N=1, immr=32, imms=63
generateTrg1Src1ImmInstruction(cg, TR::InstOpCode::ubfmx, node, trgReg, trgReg, imm);
if (tmpReg)
{
cg->stopUsingRegister(tmpReg);
}
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
TR::Register *
OMR::ARM64::TreeEvaluator::lmulEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *src1Reg = cg->evaluate(firstChild);
TR::Register *src2Reg = NULL;
TR::Register *trgReg = NULL;
int64_t value = 0;
if (secondChild->getOpCode().isLoadConst() && secondChild->getRegister() == NULL)
{
value = secondChild->getLongInt();
if (value > 0 && cg->convertMultiplyToShift(node))
{
trgReg = cg->evaluate(node);
return trgReg;
}
}
if(1 == firstChild->getReferenceCount())
{
trgReg = src1Reg;
}
else if(1 == secondChild->getReferenceCount() && (src2Reg = secondChild->getRegister()) != NULL)
{
trgReg = src2Reg;
}
else
{
trgReg = cg->allocateRegister();
}
if (secondChild->getOpCode().isLoadConst() && secondChild->getRegister() == NULL)
{
mulConstant64(node, trgReg, src1Reg, value, cg);
}
else
{
TR::Register *src2Reg = cg->evaluate(secondChild);
generateMulInstruction(cg, node, trgReg, src1Reg, src2Reg);
}
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
static TR::Register *idivHelper(TR::Node *node, bool is64bit, TR::CodeGenerator *cg)
{
// TODO: Add checks for special cases
TR::Node *firstChild = node->getFirstChild();
TR::Register *src1Reg = cg->evaluate(firstChild);
TR::Node *secondChild = node->getSecondChild();
TR::Register *src2Reg = cg->evaluate(secondChild);
TR::Register *trgReg = cg->allocateRegister();
generateTrg1Src2Instruction(cg, is64bit ? TR::InstOpCode::sdivx : TR::InstOpCode::sdivw, node, trgReg, src1Reg, src2Reg);
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
static TR::Register *iremHelper(TR::Node *node, bool is64bit, TR::CodeGenerator *cg)
{
// TODO: Add checks for special cases
TR::Node *firstChild = node->getFirstChild();
TR::Register *src1Reg = cg->evaluate(firstChild);
TR::Node *secondChild = node->getSecondChild();
TR::Register *src2Reg = cg->evaluate(secondChild);
TR::Register *tmpReg = cg->allocateRegister();
TR::Register *trgReg = cg->allocateRegister();
generateTrg1Src2Instruction(cg, is64bit ? TR::InstOpCode::sdivx : TR::InstOpCode::sdivw, node, tmpReg, src1Reg, src2Reg);
generateTrg1Src3Instruction(cg, is64bit ? TR::InstOpCode::msubx : TR::InstOpCode::msubw, node, trgReg, tmpReg, src2Reg, src1Reg);
cg->stopUsingRegister(tmpReg);
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
TR::Register *
OMR::ARM64::TreeEvaluator::lmulhEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Register *src1Reg = cg->evaluate(firstChild);
TR::Node *secondChild = node->getSecondChild();
TR::Register *src2Reg;
TR::Register *trgReg = cg->allocateRegister();
TR::Register *tmpReg = NULL;
// lmulh is generated for constant ldiv and the second child is the magic number
// assume magic number is usually a large odd number with little optimization opportunity
if (secondChild->getOpCode().isLoadConst() && secondChild->getRegister() == NULL)
{
int64_t value = secondChild->getLongInt();
src2Reg = tmpReg = cg->allocateRegister();
loadConstant64(cg, node, value, src2Reg);
}
else
{
src2Reg = cg->evaluate(secondChild);
}
generateTrg1Src2Instruction(cg, TR::InstOpCode::smulh, node, trgReg, src1Reg, src2Reg);
if (tmpReg)
{
cg->stopUsingRegister(tmpReg);
}
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
TR::Register *
OMR::ARM64::TreeEvaluator::idivEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return genericBinaryEvaluator(node, TR::InstOpCode::sdivw, TR::InstOpCode::sdivw, false, cg);
}
TR::Register *
OMR::ARM64::TreeEvaluator::iremEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return iremHelper(node, false, cg);
}
TR::Register *
OMR::ARM64::TreeEvaluator::ldivEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return genericBinaryEvaluator(node, TR::InstOpCode::sdivx, TR::InstOpCode::sdivx, true, cg);
}
TR::Register *
OMR::ARM64::TreeEvaluator::lremEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return iremHelper(node, true, cg);
}
static TR::Register *shiftHelper(TR::Node *node, TR::ARM64ShiftCode shiftType, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::ILOpCodes secondOp = secondChild->getOpCodeValue();
TR::Register *srcReg = cg->evaluate(firstChild);
TR::Register *trgReg = cg->allocateRegister();
bool is64bit = node->getDataType().isInt64();
TR::InstOpCode::Mnemonic op;
if (secondOp == TR::iconst)
{
int32_t value = secondChild->getInt();
uint32_t shift = is64bit ? (value & 0x3F) : (value & 0x1F);
switch (shiftType)
{
case TR::SH_LSL:
generateLogicalShiftLeftImmInstruction(cg, node, trgReg, srcReg, shift, is64bit);
break;
case TR::SH_LSR:
generateLogicalShiftRightImmInstruction(cg, node, trgReg, srcReg, shift, is64bit);
break;
case TR::SH_ASR:
generateArithmeticShiftRightImmInstruction(cg, node, trgReg, srcReg, shift, is64bit);
break;
default:
TR_ASSERT(false, "Unsupported shift type.");
}
}
else
{
TR::Register *shiftAmountReg = cg->evaluate(secondChild);
switch (shiftType)
{
case TR::SH_LSL:
op = is64bit ? TR::InstOpCode::lslvx : TR::InstOpCode::lslvw;
break;
case TR::SH_LSR:
op = is64bit ? TR::InstOpCode::lsrvx : TR::InstOpCode::lsrvw;
break;
case TR::SH_ASR:
op = is64bit ? TR::InstOpCode::asrvx : TR::InstOpCode::asrvw;
break;
default:
TR_ASSERT(false, "Unsupported shift type.");
}
generateTrg1Src2Instruction(cg, op, node, trgReg, srcReg, shiftAmountReg);
}
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
// also handles lshl
TR::Register *
OMR::ARM64::TreeEvaluator::ishlEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return shiftHelper(node, TR::SH_LSL, cg);
}
// also handles lshr
TR::Register *
OMR::ARM64::TreeEvaluator::ishrEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return shiftHelper(node, TR::SH_ASR, cg);
}
// also handles lushr
TR::Register *
OMR::ARM64::TreeEvaluator::iushrEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
return shiftHelper(node, TR::SH_LSR, cg);
}
// also handles lrol
TR::Register *
OMR::ARM64::TreeEvaluator::irolEvaluator(TR::Node *node, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *trgReg = cg->gprClobberEvaluate(firstChild);
bool is64bit = node->getDataType().isInt64();
TR::InstOpCode::Mnemonic op;
if (secondChild->getOpCode().isLoadConst())
{
int32_t value = secondChild->getInt();
uint32_t shift = is64bit ? (value & 0x3F) : (value & 0x1F);
if (shift != 0)
{
shift = is64bit ? (64 - shift) : (32 - shift); // change ROL to ROR
op = is64bit ? TR::InstOpCode::extrx : TR::InstOpCode::extrw; // ROR is an alias of EXTR
generateTrg1Src2ShiftedInstruction(cg, op, node, trgReg, trgReg, trgReg, TR::SH_LSL, shift);
}
}
else
{
TR::Register *shiftAmountSrcReg;
TR::Register *shiftAmountReg;
TR::Register *tempReg;
bool useTempReg;
if (secondChild->getOpCode().isNeg() && secondChild->getRegister() == NULL && secondChild->getReferenceCount() == 1)
{
// If the second child is `ineg` and not commoned, cancel out double negation
auto shiftAmountNode = secondChild->getFirstChild();
useTempReg = is64bit && shiftAmountNode->getReferenceCount() > 1;
tempReg = useTempReg ? cg->allocateRegister() : NULL;
shiftAmountSrcReg = cg->evaluate(shiftAmountNode);
shiftAmountReg = useTempReg ? tempReg : shiftAmountSrcReg;
if (is64bit)
{
// 32->64 bit sign extension: SXTW is alias of SBFM
uint32_t imm = 0x1F; // immr=0, imms=31, N bit is pre-encoded in `sbfmx` opcode.
generateTrg1Src1ImmInstruction(cg, TR::InstOpCode::sbfmx, node, shiftAmountReg, shiftAmountSrcReg, imm);
}
cg->decReferenceCount(shiftAmountNode);
}
else
{
useTempReg = secondChild->getReferenceCount() > 1;
tempReg = useTempReg ? cg->allocateRegister() : NULL;
shiftAmountSrcReg = cg->evaluate(secondChild);
shiftAmountReg = useTempReg ? tempReg : shiftAmountSrcReg;
generateNegInstruction(cg, node, shiftAmountReg, shiftAmountSrcReg); // change ROL to ROR
if (is64bit)
{
// 32->64 bit sign extension: SXTW is alias of SBFM
uint32_t imm = 0x1F; // immr=0, imms=31, N bit is pre-encoded in `sbfmx` opcode.
generateTrg1Src1ImmInstruction(cg, TR::InstOpCode::sbfmx, node, shiftAmountReg, shiftAmountReg, imm);
}
}
op = is64bit ? TR::InstOpCode::rorvx : TR::InstOpCode::rorvw;
generateTrg1Src2Instruction(cg, op, node, trgReg, trgReg, shiftAmountReg);
if (useTempReg)
{
cg->stopUsingRegister(tempReg);
}
}
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
/**
* Helper template function that decodes bitmask for logic op codes
* @param[in] Nbit: N bit
* @param[in] immr : immr part of immediate
* @param[in] imms : imms part of immediate
* @param[out] wmask : returned immediate
* @return true if successfully decoded
*/
template<typename U>
bool
decodeBitMasksImpl(bool Nbit, uint32_t immr, uint32_t imms, U &wmask)
{
const size_t immBitLen = sizeof(U) * 8;
if ((immBitLen == 32) && Nbit)
{
return false;
}
int len = Nbit ? 6 : (31 - leadingZeroes((~imms) & 0x3f));
if ((len <= 0) || (immBitLen < (1 << len)))
{
return false;
}
uint32_t levels = (1 << len) - 1;
uint32_t s = imms & levels;
if (s == levels)
{
return false;
}
U welem = (static_cast<U>(1) << (s + 1)) - 1;
uint32_t elemLen = 1 << len;
uint32_t r = immr & levels;
U mask = (immBitLen == elemLen) ? (~static_cast<U>(0)) : (static_cast<U>(1) << elemLen) - 1;
U elem = ((welem << (elemLen - r)) | (welem >> r)) & mask;
while (elemLen < immBitLen)
{
elem |= (elem << elemLen);
elemLen *= 2;
}
wmask = elem;
return true;
}
/**
* Decodes bitmask for 32bit variants of logic op codes
* @param[in] Nbit: N bit
* @param[in] immr : immr part of immediate
* @param[in] imms : imms part of immediate
* @param[out] wmask : returned immediate
* @return true if successfully decoded
*/
bool
decodeBitMasks(bool Nbit, uint32_t immr, uint32_t imms, uint32_t &wmask)
{
return decodeBitMasksImpl(Nbit, immr, imms, wmask);
}
/**
* Decodes bitmask for 64bit variants of logic op codes
* @param[in] Nbit: N bit
* @param[in] immr : immr part of immediate
* @param[in] imms : imms part of immediate
* @param[out] wmask : returned immediate
* @return true if successfully decoded
*/
bool
decodeBitMasks(bool Nbit, uint32_t immr, uint32_t imms, uint64_t &wmask)
{
return decodeBitMasksImpl(Nbit, immr, imms, wmask);
}
/**
* Helper template function that find rotate count and ones count for value.
* @param[in] value : immediate value element
* @param[in] elementSize : element size
* @param[out] rotateCount : right rotate count
* @param[out] onesCount : number of consective ones in value
* @return true if value has contiguous ones (as elementSize-bit integer)
*/
template<typename T, typename U> inline
bool findLogicImmediateBitPattern(T value, int elementSize, int32_t &rotateCount, int32_t &onesCount)
{
U signExtendedValue = value;
const size_t size = sizeof(U) * 8;
// if elementSize is 2 or 4, ones in value are always contiguous.
if (elementSize > 4)
{
if (elementSize < size)
{
signExtendedValue = (((U)value) << (size - elementSize)) >> (size - elementSize);
}
if (!contiguousBits(signExtendedValue))
{
return false;
}
}
int32_t tz = trailingZeroes(value);
onesCount = populationCount(value);
// if value has trailing zeroes, right rorate count is elementSize - (trailing zeroes count).
// if not, right rotate count is leading ones of value (viewed as elementSize-bit integer),
// which is obtained by subtracting trailing ones count from total ones count.
rotateCount = (tz != 0) ? (elementSize - tz) : (onesCount - trailingZeroes(~value));
return true;
}
/**
* Helper function for encoding immediate value of logic instructions.
* @param[in] value : immediate value to encode
* @param[in] is64Bit : true if 64bit instruction
* @param[out] n : N bit
* @param[out] immEncoded : immr and imms encoded in 12bit field
* @return true if value can be encoded as immediate operand
*/
bool
logicImmediateHelper(uint64_t value, bool is64Bit, bool &n, uint32_t &immEncoded)
{
uint64_t mask = ~(uint64_t)0;
int elementSize = is64Bit ? 64 : 32;
// leading ones in imms
uint32_t imms = 1 << 7;
if (!is64Bit)
{
mask >>= elementSize;
imms >>= 1;
}
// all zeroes or all ones are not allowed
if ((value == 0) || (value == mask))
{
return false;
}
do
{
uint32_t highBits = value >> (elementSize /2);
uint32_t lowBits = value & (mask >> (elementSize / 2));
if (highBits != lowBits)
{
// found element size
break;
}
imms = imms | (imms >> 1);
value = lowBits;
mask >>= elementSize / 2;
elementSize /= 2;
} while (elementSize > 2);
int32_t rotateCount;
int32_t onesCount;
if (is64Bit)
{
if (!findLogicImmediateBitPattern<uint64_t, int64_t>(value, elementSize, rotateCount, onesCount))
{
return false;
}
}
else
{
if (!findLogicImmediateBitPattern<uint32_t, int32_t>((uint32_t)value, elementSize, rotateCount, onesCount))
{
return false;
}
}
TR_ASSERT((onesCount > 0) && (onesCount < elementSize), "Failed to encode imms.");
TR_ASSERT((rotateCount >= 0) && (rotateCount < elementSize), "Failed to encode immr.");
imms |= onesCount - 1;
imms &= (1 << 6) - 1;
immEncoded = (rotateCount << 6) | imms;
n = elementSize == 64;
return true;
}
/**
* Helper function that handles logic binary operations.
* @param[in] node : calling node
* @param[in] regOp : the target AArch64 instruction opcode
* @param[in] regOpImm : the matching AArch64 immediate instruction opcode
* regOpImm == regOp indicates that the passed opcode has no immediate form.
* @param[in] is64Bit : true if regOp and regOpImm are 64bit opcode.
* @param[in] cg : codegenerator
* @return target register
*/
static inline TR::Register *
logicBinaryEvaluator(TR::Node *node, TR::InstOpCode::Mnemonic regOp, TR::InstOpCode::Mnemonic regOpImm, bool is64Bit, TR::CodeGenerator *cg)
{
TR::Node *firstChild = node->getFirstChild();
TR::Node *secondChild = node->getSecondChild();
TR::Register *src1Reg = cg->evaluate(firstChild);
TR::Register *src2Reg = NULL;
TR::Register *trgReg = NULL;
int64_t value = 0;
if (1 == firstChild->getReferenceCount())
{
trgReg = src1Reg;
}
else if (1 == secondChild->getReferenceCount() && secondChild->getRegister() != NULL)
{
trgReg = secondChild->getRegister();
}
else
{
trgReg = cg->allocateRegister();
}
if (secondChild->getOpCode().isLoadConst() && secondChild->getRegister() == NULL)
{
if (is64Bit)
{
value = secondChild->getLongInt();
}
else
{
value = secondChild->getInt();
}
bool N;
uint32_t immEncoded;
if (logicImmediateHelper(is64Bit ? value : (uint32_t)value, is64Bit, N, immEncoded))
{
generateLogicalImmInstruction(cg, regOpImm, node, trgReg, src1Reg, N, immEncoded);
}
else
{
src2Reg = cg->allocateRegister();
if(is64Bit)
{
loadConstant64(cg, node, value, src2Reg);
}
else
{
loadConstant32(cg, node, value, src2Reg);
}
generateTrg1Src2Instruction(cg, regOp, node, trgReg, src1Reg, src2Reg);
cg->stopUsingRegister(src2Reg);
}
}
else
{
src2Reg = cg->evaluate(secondChild);
generateTrg1Src2Instruction(cg, regOp, node, trgReg, src1Reg, src2Reg);
}
node->setRegister(trgReg);
cg->decReferenceCount(firstChild);
cg->decReferenceCount(secondChild);
return trgReg;
}
TR::Register *