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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "intrinsics_mips.h"
#include "arch/mips/instruction_set_features_mips.h"
#include "art_method.h"
#include "code_generator_mips.h"
#include "entrypoints/quick/quick_entrypoints.h"
#include "intrinsics.h"
#include "mirror/array-inl.h"
#include "mirror/string.h"
#include "thread.h"
#include "utils/mips/assembler_mips.h"
#include "utils/mips/constants_mips.h"
namespace art {
namespace mips {
IntrinsicLocationsBuilderMIPS::IntrinsicLocationsBuilderMIPS(CodeGeneratorMIPS* codegen)
: arena_(codegen->GetGraph()->GetArena()) {
}
MipsAssembler* IntrinsicCodeGeneratorMIPS::GetAssembler() {
return reinterpret_cast<MipsAssembler*>(codegen_->GetAssembler());
}
ArenaAllocator* IntrinsicCodeGeneratorMIPS::GetAllocator() {
return codegen_->GetGraph()->GetArena();
}
#define __ codegen->GetAssembler()->
static void MoveFromReturnRegister(Location trg,
Primitive::Type type,
CodeGeneratorMIPS* codegen) {
if (!trg.IsValid()) {
DCHECK_EQ(type, Primitive::kPrimVoid);
return;
}
DCHECK_NE(type, Primitive::kPrimVoid);
if (Primitive::IsIntegralType(type) || type == Primitive::kPrimNot) {
Register trg_reg = trg.AsRegister<Register>();
if (trg_reg != V0) {
__ Move(V0, trg_reg);
}
} else {
FRegister trg_reg = trg.AsFpuRegister<FRegister>();
if (trg_reg != F0) {
if (type == Primitive::kPrimFloat) {
__ MovS(F0, trg_reg);
} else {
__ MovD(F0, trg_reg);
}
}
}
}
static void MoveArguments(HInvoke* invoke, CodeGeneratorMIPS* codegen) {
InvokeDexCallingConventionVisitorMIPS calling_convention_visitor;
IntrinsicVisitor::MoveArguments(invoke, codegen, &calling_convention_visitor);
}
// Slow-path for fallback (calling the managed code to handle the
// intrinsic) in an intrinsified call. This will copy the arguments
// into the positions for a regular call.
//
// Note: The actual parameters are required to be in the locations
// given by the invoke's location summary. If an intrinsic
// modifies those locations before a slowpath call, they must be
// restored!
class IntrinsicSlowPathMIPS : public SlowPathCodeMIPS {
public:
explicit IntrinsicSlowPathMIPS(HInvoke* invoke) : invoke_(invoke) { }
void EmitNativeCode(CodeGenerator* codegen_in) OVERRIDE {
CodeGeneratorMIPS* codegen = down_cast<CodeGeneratorMIPS*>(codegen_in);
__ Bind(GetEntryLabel());
SaveLiveRegisters(codegen, invoke_->GetLocations());
MoveArguments(invoke_, codegen);
if (invoke_->IsInvokeStaticOrDirect()) {
codegen->GenerateStaticOrDirectCall(invoke_->AsInvokeStaticOrDirect(),
Location::RegisterLocation(A0));
codegen->RecordPcInfo(invoke_, invoke_->GetDexPc(), this);
} else {
UNIMPLEMENTED(FATAL) << "Non-direct intrinsic slow-path not yet implemented";
UNREACHABLE();
}
// Copy the result back to the expected output.
Location out = invoke_->GetLocations()->Out();
if (out.IsValid()) {
DCHECK(out.IsRegister()); // TODO: Replace this when we support output in memory.
DCHECK(!invoke_->GetLocations()->GetLiveRegisters()->ContainsCoreRegister(out.reg()));
MoveFromReturnRegister(out, invoke_->GetType(), codegen);
}
RestoreLiveRegisters(codegen, invoke_->GetLocations());
__ B(GetExitLabel());
}
const char* GetDescription() const OVERRIDE { return "IntrinsicSlowPathMIPS"; }
private:
// The instruction where this slow path is happening.
HInvoke* const invoke_;
DISALLOW_COPY_AND_ASSIGN(IntrinsicSlowPathMIPS);
};
#undef __
bool IntrinsicLocationsBuilderMIPS::TryDispatch(HInvoke* invoke) {
Dispatch(invoke);
LocationSummary* res = invoke->GetLocations();
return res != nullptr && res->Intrinsified();
}
#define __ assembler->
static void CreateFPToIntLocations(ArenaAllocator* arena, HInvoke* invoke) {
LocationSummary* locations = new (arena) LocationSummary(invoke,
LocationSummary::kNoCall,
kIntrinsified);
locations->SetInAt(0, Location::RequiresFpuRegister());
locations->SetOut(Location::RequiresRegister());
}
static void MoveFPToInt(LocationSummary* locations, bool is64bit, MipsAssembler* assembler) {
FRegister in = locations->InAt(0).AsFpuRegister<FRegister>();
if (is64bit) {
Register out_lo = locations->Out().AsRegisterPairLow<Register>();
Register out_hi = locations->Out().AsRegisterPairHigh<Register>();
__ Mfc1(out_lo, in);
__ Mfhc1(out_hi, in);
} else {
Register out = locations->Out().AsRegister<Register>();
__ Mfc1(out, in);
}
}
// long java.lang.Double.doubleToRawLongBits(double)
void IntrinsicLocationsBuilderMIPS::VisitDoubleDoubleToRawLongBits(HInvoke* invoke) {
CreateFPToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitDoubleDoubleToRawLongBits(HInvoke* invoke) {
MoveFPToInt(invoke->GetLocations(), true, GetAssembler());
}
// int java.lang.Float.floatToRawIntBits(float)
void IntrinsicLocationsBuilderMIPS::VisitFloatFloatToRawIntBits(HInvoke* invoke) {
CreateFPToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitFloatFloatToRawIntBits(HInvoke* invoke) {
MoveFPToInt(invoke->GetLocations(), false, GetAssembler());
}
static void CreateIntToFPLocations(ArenaAllocator* arena, HInvoke* invoke) {
LocationSummary* locations = new (arena) LocationSummary(invoke,
LocationSummary::kNoCall,
kIntrinsified);
locations->SetInAt(0, Location::RequiresRegister());
locations->SetOut(Location::RequiresFpuRegister());
}
static void MoveIntToFP(LocationSummary* locations, bool is64bit, MipsAssembler* assembler) {
FRegister out = locations->Out().AsFpuRegister<FRegister>();
if (is64bit) {
Register in_lo = locations->InAt(0).AsRegisterPairLow<Register>();
Register in_hi = locations->InAt(0).AsRegisterPairHigh<Register>();
__ Mtc1(in_lo, out);
__ Mthc1(in_hi, out);
} else {
Register in = locations->InAt(0).AsRegister<Register>();
__ Mtc1(in, out);
}
}
// double java.lang.Double.longBitsToDouble(long)
void IntrinsicLocationsBuilderMIPS::VisitDoubleLongBitsToDouble(HInvoke* invoke) {
CreateIntToFPLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitDoubleLongBitsToDouble(HInvoke* invoke) {
MoveIntToFP(invoke->GetLocations(), true, GetAssembler());
}
// float java.lang.Float.intBitsToFloat(int)
void IntrinsicLocationsBuilderMIPS::VisitFloatIntBitsToFloat(HInvoke* invoke) {
CreateIntToFPLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitFloatIntBitsToFloat(HInvoke* invoke) {
MoveIntToFP(invoke->GetLocations(), false, GetAssembler());
}
static void CreateIntToIntLocations(ArenaAllocator* arena,
HInvoke* invoke,
Location::OutputOverlap overlaps = Location::kNoOutputOverlap) {
LocationSummary* locations = new (arena) LocationSummary(invoke,
LocationSummary::kNoCall,
kIntrinsified);
locations->SetInAt(0, Location::RequiresRegister());
locations->SetOut(Location::RequiresRegister(), overlaps);
}
static void GenReverse(LocationSummary* locations,
Primitive::Type type,
bool isR2OrNewer,
bool isR6,
bool reverseBits,
MipsAssembler* assembler) {
DCHECK(type == Primitive::kPrimShort ||
type == Primitive::kPrimInt ||
type == Primitive::kPrimLong);
DCHECK(type != Primitive::kPrimShort || !reverseBits);
if (type == Primitive::kPrimShort) {
Register in = locations->InAt(0).AsRegister<Register>();
Register out = locations->Out().AsRegister<Register>();
if (isR2OrNewer) {
__ Wsbh(out, in);
__ Seh(out, out);
} else {
__ Sll(TMP, in, 24);
__ Sra(TMP, TMP, 16);
__ Sll(out, in, 16);
__ Srl(out, out, 24);
__ Or(out, out, TMP);
}
} else if (type == Primitive::kPrimInt) {
Register in = locations->InAt(0).AsRegister<Register>();
Register out = locations->Out().AsRegister<Register>();
if (isR2OrNewer) {
__ Rotr(out, in, 16);
__ Wsbh(out, out);
} else {
// MIPS32r1
// __ Rotr(out, in, 16);
__ Sll(TMP, in, 16);
__ Srl(out, in, 16);
__ Or(out, out, TMP);
// __ Wsbh(out, out);
__ LoadConst32(AT, 0x00FF00FF);
__ And(TMP, out, AT);
__ Sll(TMP, TMP, 8);
__ Srl(out, out, 8);
__ And(out, out, AT);
__ Or(out, out, TMP);
}
if (reverseBits) {
if (isR6) {
__ Bitswap(out, out);
} else {
__ LoadConst32(AT, 0x0F0F0F0F);
__ And(TMP, out, AT);
__ Sll(TMP, TMP, 4);
__ Srl(out, out, 4);
__ And(out, out, AT);
__ Or(out, TMP, out);
__ LoadConst32(AT, 0x33333333);
__ And(TMP, out, AT);
__ Sll(TMP, TMP, 2);
__ Srl(out, out, 2);
__ And(out, out, AT);
__ Or(out, TMP, out);
__ LoadConst32(AT, 0x55555555);
__ And(TMP, out, AT);
__ Sll(TMP, TMP, 1);
__ Srl(out, out, 1);
__ And(out, out, AT);
__ Or(out, TMP, out);
}
}
} else if (type == Primitive::kPrimLong) {
Register in_lo = locations->InAt(0).AsRegisterPairLow<Register>();
Register in_hi = locations->InAt(0).AsRegisterPairHigh<Register>();
Register out_lo = locations->Out().AsRegisterPairLow<Register>();
Register out_hi = locations->Out().AsRegisterPairHigh<Register>();
if (isR2OrNewer) {
__ Rotr(AT, in_hi, 16);
__ Rotr(TMP, in_lo, 16);
__ Wsbh(out_lo, AT);
__ Wsbh(out_hi, TMP);
} else {
// When calling CreateIntToIntLocations() we promised that the
// use of the out_lo/out_hi wouldn't overlap with the use of
// in_lo/in_hi. Be very careful not to write to out_lo/out_hi
// until we're completely done reading from in_lo/in_hi.
// __ Rotr(TMP, in_lo, 16);
__ Sll(TMP, in_lo, 16);
__ Srl(AT, in_lo, 16);
__ Or(TMP, TMP, AT); // Hold in TMP until it's safe
// to write to out_hi.
// __ Rotr(out_lo, in_hi, 16);
__ Sll(AT, in_hi, 16);
__ Srl(out_lo, in_hi, 16); // Here we are finally done reading
// from in_lo/in_hi so it's okay to
// write to out_lo/out_hi.
__ Or(out_lo, out_lo, AT);
// __ Wsbh(out_hi, out_hi);
__ LoadConst32(AT, 0x00FF00FF);
__ And(out_hi, TMP, AT);
__ Sll(out_hi, out_hi, 8);
__ Srl(TMP, TMP, 8);
__ And(TMP, TMP, AT);
__ Or(out_hi, out_hi, TMP);
// __ Wsbh(out_lo, out_lo);
__ And(TMP, out_lo, AT); // AT already holds the correct mask value
__ Sll(TMP, TMP, 8);
__ Srl(out_lo, out_lo, 8);
__ And(out_lo, out_lo, AT);
__ Or(out_lo, out_lo, TMP);
}
if (reverseBits) {
if (isR6) {
__ Bitswap(out_hi, out_hi);
__ Bitswap(out_lo, out_lo);
} else {
__ LoadConst32(AT, 0x0F0F0F0F);
__ And(TMP, out_hi, AT);
__ Sll(TMP, TMP, 4);
__ Srl(out_hi, out_hi, 4);
__ And(out_hi, out_hi, AT);
__ Or(out_hi, TMP, out_hi);
__ And(TMP, out_lo, AT);
__ Sll(TMP, TMP, 4);
__ Srl(out_lo, out_lo, 4);
__ And(out_lo, out_lo, AT);
__ Or(out_lo, TMP, out_lo);
__ LoadConst32(AT, 0x33333333);
__ And(TMP, out_hi, AT);
__ Sll(TMP, TMP, 2);
__ Srl(out_hi, out_hi, 2);
__ And(out_hi, out_hi, AT);
__ Or(out_hi, TMP, out_hi);
__ And(TMP, out_lo, AT);
__ Sll(TMP, TMP, 2);
__ Srl(out_lo, out_lo, 2);
__ And(out_lo, out_lo, AT);
__ Or(out_lo, TMP, out_lo);
__ LoadConst32(AT, 0x55555555);
__ And(TMP, out_hi, AT);
__ Sll(TMP, TMP, 1);
__ Srl(out_hi, out_hi, 1);
__ And(out_hi, out_hi, AT);
__ Or(out_hi, TMP, out_hi);
__ And(TMP, out_lo, AT);
__ Sll(TMP, TMP, 1);
__ Srl(out_lo, out_lo, 1);
__ And(out_lo, out_lo, AT);
__ Or(out_lo, TMP, out_lo);
}
}
}
}
// int java.lang.Integer.reverseBytes(int)
void IntrinsicLocationsBuilderMIPS::VisitIntegerReverseBytes(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitIntegerReverseBytes(HInvoke* invoke) {
GenReverse(invoke->GetLocations(),
Primitive::kPrimInt,
codegen_->GetInstructionSetFeatures().IsMipsIsaRevGreaterThanEqual2(),
codegen_->GetInstructionSetFeatures().IsR6(),
false,
GetAssembler());
}
// long java.lang.Long.reverseBytes(long)
void IntrinsicLocationsBuilderMIPS::VisitLongReverseBytes(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitLongReverseBytes(HInvoke* invoke) {
GenReverse(invoke->GetLocations(),
Primitive::kPrimLong,
codegen_->GetInstructionSetFeatures().IsMipsIsaRevGreaterThanEqual2(),
codegen_->GetInstructionSetFeatures().IsR6(),
false,
GetAssembler());
}
// short java.lang.Short.reverseBytes(short)
void IntrinsicLocationsBuilderMIPS::VisitShortReverseBytes(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitShortReverseBytes(HInvoke* invoke) {
GenReverse(invoke->GetLocations(),
Primitive::kPrimShort,
codegen_->GetInstructionSetFeatures().IsMipsIsaRevGreaterThanEqual2(),
codegen_->GetInstructionSetFeatures().IsR6(),
false,
GetAssembler());
}
static void GenNumberOfLeadingZeroes(LocationSummary* locations,
bool is64bit,
bool isR6,
MipsAssembler* assembler) {
Register out = locations->Out().AsRegister<Register>();
if (is64bit) {
Register in_lo = locations->InAt(0).AsRegisterPairLow<Register>();
Register in_hi = locations->InAt(0).AsRegisterPairHigh<Register>();
if (isR6) {
__ ClzR6(AT, in_hi);
__ ClzR6(TMP, in_lo);
__ Seleqz(TMP, TMP, in_hi);
} else {
__ ClzR2(AT, in_hi);
__ ClzR2(TMP, in_lo);
__ Movn(TMP, ZERO, in_hi);
}
__ Addu(out, AT, TMP);
} else {
Register in = locations->InAt(0).AsRegister<Register>();
if (isR6) {
__ ClzR6(out, in);
} else {
__ ClzR2(out, in);
}
}
}
// int java.lang.Integer.numberOfLeadingZeros(int i)
void IntrinsicLocationsBuilderMIPS::VisitIntegerNumberOfLeadingZeros(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitIntegerNumberOfLeadingZeros(HInvoke* invoke) {
GenNumberOfLeadingZeroes(invoke->GetLocations(),
false,
codegen_->GetInstructionSetFeatures().IsR6(),
GetAssembler());
}
// int java.lang.Long.numberOfLeadingZeros(long i)
void IntrinsicLocationsBuilderMIPS::VisitLongNumberOfLeadingZeros(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitLongNumberOfLeadingZeros(HInvoke* invoke) {
GenNumberOfLeadingZeroes(invoke->GetLocations(),
true,
codegen_->GetInstructionSetFeatures().IsR6(),
GetAssembler());
}
static void GenNumberOfTrailingZeroes(LocationSummary* locations,
bool is64bit,
bool isR6,
bool isR2OrNewer,
MipsAssembler* assembler) {
Register out = locations->Out().AsRegister<Register>();
Register in_lo;
Register in;
if (is64bit) {
MipsLabel done;
Register in_hi = locations->InAt(0).AsRegisterPairHigh<Register>();
in_lo = locations->InAt(0).AsRegisterPairLow<Register>();
// If in_lo is zero then count the number of trailing zeroes in in_hi;
// otherwise count the number of trailing zeroes in in_lo.
// AT = in_lo ? in_lo : in_hi;
if (isR6) {
__ Seleqz(out, in_hi, in_lo);
__ Selnez(TMP, in_lo, in_lo);
__ Or(out, out, TMP);
} else {
__ Movz(out, in_hi, in_lo);
__ Movn(out, in_lo, in_lo);
}
in = out;
} else {
in = locations->InAt(0).AsRegister<Register>();
// Give in_lo a dummy value to keep the compiler from complaining.
// Since we only get here in the 32-bit case, this value will never
// be used.
in_lo = in;
}
// We don't have an instruction to count the number of trailing zeroes.
// Start by flipping the bits end-for-end so we can count the number of
// leading zeroes instead.
if (isR2OrNewer) {
__ Rotr(out, in, 16);
__ Wsbh(out, out);
} else {
// MIPS32r1
// __ Rotr(out, in, 16);
__ Sll(TMP, in, 16);
__ Srl(out, in, 16);
__ Or(out, out, TMP);
// __ Wsbh(out, out);
__ LoadConst32(AT, 0x00FF00FF);
__ And(TMP, out, AT);
__ Sll(TMP, TMP, 8);
__ Srl(out, out, 8);
__ And(out, out, AT);
__ Or(out, out, TMP);
}
if (isR6) {
__ Bitswap(out, out);
__ ClzR6(out, out);
} else {
__ LoadConst32(AT, 0x0F0F0F0F);
__ And(TMP, out, AT);
__ Sll(TMP, TMP, 4);
__ Srl(out, out, 4);
__ And(out, out, AT);
__ Or(out, TMP, out);
__ LoadConst32(AT, 0x33333333);
__ And(TMP, out, AT);
__ Sll(TMP, TMP, 2);
__ Srl(out, out, 2);
__ And(out, out, AT);
__ Or(out, TMP, out);
__ LoadConst32(AT, 0x55555555);
__ And(TMP, out, AT);
__ Sll(TMP, TMP, 1);
__ Srl(out, out, 1);
__ And(out, out, AT);
__ Or(out, TMP, out);
__ ClzR2(out, out);
}
if (is64bit) {
// If in_lo is zero, then we counted the number of trailing zeroes in in_hi so we must add the
// number of trailing zeroes in in_lo (32) to get the correct final count
__ LoadConst32(TMP, 32);
if (isR6) {
__ Seleqz(TMP, TMP, in_lo);
} else {
__ Movn(TMP, ZERO, in_lo);
}
__ Addu(out, out, TMP);
}
}
// int java.lang.Integer.numberOfTrailingZeros(int i)
void IntrinsicLocationsBuilderMIPS::VisitIntegerNumberOfTrailingZeros(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke, Location::kOutputOverlap);
}
void IntrinsicCodeGeneratorMIPS::VisitIntegerNumberOfTrailingZeros(HInvoke* invoke) {
GenNumberOfTrailingZeroes(invoke->GetLocations(),
false,
codegen_->GetInstructionSetFeatures().IsR6(),
codegen_->GetInstructionSetFeatures().IsMipsIsaRevGreaterThanEqual2(),
GetAssembler());
}
// int java.lang.Long.numberOfTrailingZeros(long i)
void IntrinsicLocationsBuilderMIPS::VisitLongNumberOfTrailingZeros(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke, Location::kOutputOverlap);
}
void IntrinsicCodeGeneratorMIPS::VisitLongNumberOfTrailingZeros(HInvoke* invoke) {
GenNumberOfTrailingZeroes(invoke->GetLocations(),
true,
codegen_->GetInstructionSetFeatures().IsR6(),
codegen_->GetInstructionSetFeatures().IsMipsIsaRevGreaterThanEqual2(),
GetAssembler());
}
// int java.lang.Integer.reverse(int)
void IntrinsicLocationsBuilderMIPS::VisitIntegerReverse(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitIntegerReverse(HInvoke* invoke) {
GenReverse(invoke->GetLocations(),
Primitive::kPrimInt,
codegen_->GetInstructionSetFeatures().IsMipsIsaRevGreaterThanEqual2(),
codegen_->GetInstructionSetFeatures().IsR6(),
true,
GetAssembler());
}
// long java.lang.Long.reverse(long)
void IntrinsicLocationsBuilderMIPS::VisitLongReverse(HInvoke* invoke) {
CreateIntToIntLocations(arena_, invoke);
}
void IntrinsicCodeGeneratorMIPS::VisitLongReverse(HInvoke* invoke) {
GenReverse(invoke->GetLocations(),
Primitive::kPrimLong,
codegen_->GetInstructionSetFeatures().IsMipsIsaRevGreaterThanEqual2(),
codegen_->GetInstructionSetFeatures().IsR6(),
true,
GetAssembler());
}
// boolean java.lang.String.equals(Object anObject)
void IntrinsicLocationsBuilderMIPS::VisitStringEquals(HInvoke* invoke) {
LocationSummary* locations = new (arena_) LocationSummary(invoke,
LocationSummary::kNoCall,
kIntrinsified);
locations->SetInAt(0, Location::RequiresRegister());
locations->SetInAt(1, Location::RequiresRegister());
locations->SetOut(Location::RequiresRegister());
// Temporary registers to store lengths of strings and for calculations.
locations->AddTemp(Location::RequiresRegister());
locations->AddTemp(Location::RequiresRegister());
locations->AddTemp(Location::RequiresRegister());
}
void IntrinsicCodeGeneratorMIPS::VisitStringEquals(HInvoke* invoke) {
MipsAssembler* assembler = GetAssembler();
LocationSummary* locations = invoke->GetLocations();
Register str = locations->InAt(0).AsRegister<Register>();
Register arg = locations->InAt(1).AsRegister<Register>();
Register out = locations->Out().AsRegister<Register>();
Register temp1 = locations->GetTemp(0).AsRegister<Register>();
Register temp2 = locations->GetTemp(1).AsRegister<Register>();
Register temp3 = locations->GetTemp(2).AsRegister<Register>();
MipsLabel loop;
MipsLabel end;
MipsLabel return_true;
MipsLabel return_false;
// Get offsets of count, value, and class fields within a string object.
const uint32_t count_offset = mirror::String::CountOffset().Uint32Value();
const uint32_t value_offset = mirror::String::ValueOffset().Uint32Value();
const uint32_t class_offset = mirror::Object::ClassOffset().Uint32Value();
// Note that the null check must have been done earlier.
DCHECK(!invoke->CanDoImplicitNullCheckOn(invoke->InputAt(0)));
// If the register containing the pointer to "this", and the register
// containing the pointer to "anObject" are the same register then
// "this", and "anObject" are the same object and we can
// short-circuit the logic to a true result.
if (str == arg) {
__ LoadConst32(out, 1);
return;
}
// Check if input is null, return false if it is.
__ Beqz(arg, &return_false);
// Reference equality check, return true if same reference.
__ Beq(str, arg, &return_true);
// Instanceof check for the argument by comparing class fields.
// All string objects must have the same type since String cannot be subclassed.
// Receiver must be a string object, so its class field is equal to all strings' class fields.
// If the argument is a string object, its class field must be equal to receiver's class field.
__ Lw(temp1, str, class_offset);
__ Lw(temp2, arg, class_offset);
__ Bne(temp1, temp2, &return_false);
// Load lengths of this and argument strings.
__ Lw(temp1, str, count_offset);
__ Lw(temp2, arg, count_offset);
// Check if lengths are equal, return false if they're not.
__ Bne(temp1, temp2, &return_false);
// Return true if both strings are empty.
__ Beqz(temp1, &return_true);
// Don't overwrite input registers
__ Move(TMP, str);
__ Move(temp3, arg);
// Assertions that must hold in order to compare strings 2 characters at a time.
DCHECK_ALIGNED(value_offset, 4);
static_assert(IsAligned<4>(kObjectAlignment), "String of odd length is not zero padded");
// Loop to compare strings 2 characters at a time starting at the beginning of the string.
// Ok to do this because strings are zero-padded.
__ Bind(&loop);
__ Lw(out, TMP, value_offset);
__ Lw(temp2, temp3, value_offset);
__ Bne(out, temp2, &return_false);
__ Addiu(TMP, TMP, 4);
__ Addiu(temp3, temp3, 4);
__ Addiu(temp1, temp1, -2);
__ Bgtz(temp1, &loop);
// Return true and exit the function.
// If loop does not result in returning false, we return true.
__ Bind(&return_true);
__ LoadConst32(out, 1);
__ B(&end);
// Return false and exit the function.
__ Bind(&return_false);
__ LoadConst32(out, 0);
__ Bind(&end);
}
// Unimplemented intrinsics.
#define UNIMPLEMENTED_INTRINSIC(Name) \
void IntrinsicLocationsBuilderMIPS::Visit ## Name(HInvoke* invoke ATTRIBUTE_UNUSED) { \
} \
void IntrinsicCodeGeneratorMIPS::Visit ## Name(HInvoke* invoke ATTRIBUTE_UNUSED) { \
}
UNIMPLEMENTED_INTRINSIC(MathAbsDouble)
UNIMPLEMENTED_INTRINSIC(MathAbsFloat)
UNIMPLEMENTED_INTRINSIC(MathAbsInt)
UNIMPLEMENTED_INTRINSIC(MathAbsLong)
UNIMPLEMENTED_INTRINSIC(MathMinDoubleDouble)
UNIMPLEMENTED_INTRINSIC(MathMinFloatFloat)
UNIMPLEMENTED_INTRINSIC(MathMaxDoubleDouble)
UNIMPLEMENTED_INTRINSIC(MathMaxFloatFloat)
UNIMPLEMENTED_INTRINSIC(MathMinIntInt)
UNIMPLEMENTED_INTRINSIC(MathMinLongLong)
UNIMPLEMENTED_INTRINSIC(MathMaxIntInt)
UNIMPLEMENTED_INTRINSIC(MathMaxLongLong)
UNIMPLEMENTED_INTRINSIC(MathSqrt)
UNIMPLEMENTED_INTRINSIC(MathCeil)
UNIMPLEMENTED_INTRINSIC(MathFloor)
UNIMPLEMENTED_INTRINSIC(MathRint)
UNIMPLEMENTED_INTRINSIC(MathRoundDouble)
UNIMPLEMENTED_INTRINSIC(MathRoundFloat)
UNIMPLEMENTED_INTRINSIC(MemoryPeekByte)
UNIMPLEMENTED_INTRINSIC(MemoryPeekIntNative)
UNIMPLEMENTED_INTRINSIC(MemoryPeekLongNative)
UNIMPLEMENTED_INTRINSIC(MemoryPeekShortNative)
UNIMPLEMENTED_INTRINSIC(MemoryPokeByte)
UNIMPLEMENTED_INTRINSIC(MemoryPokeIntNative)
UNIMPLEMENTED_INTRINSIC(MemoryPokeLongNative)
UNIMPLEMENTED_INTRINSIC(MemoryPokeShortNative)
UNIMPLEMENTED_INTRINSIC(ThreadCurrentThread)
UNIMPLEMENTED_INTRINSIC(UnsafeGet)
UNIMPLEMENTED_INTRINSIC(UnsafeGetVolatile)
UNIMPLEMENTED_INTRINSIC(UnsafeGetLong)
UNIMPLEMENTED_INTRINSIC(UnsafeGetLongVolatile)
UNIMPLEMENTED_INTRINSIC(UnsafeGetObject)
UNIMPLEMENTED_INTRINSIC(UnsafeGetObjectVolatile)
UNIMPLEMENTED_INTRINSIC(UnsafePut)
UNIMPLEMENTED_INTRINSIC(UnsafePutOrdered)
UNIMPLEMENTED_INTRINSIC(UnsafePutVolatile)
UNIMPLEMENTED_INTRINSIC(UnsafePutObject)
UNIMPLEMENTED_INTRINSIC(UnsafePutObjectOrdered)
UNIMPLEMENTED_INTRINSIC(UnsafePutObjectVolatile)
UNIMPLEMENTED_INTRINSIC(UnsafePutLong)
UNIMPLEMENTED_INTRINSIC(UnsafePutLongOrdered)
UNIMPLEMENTED_INTRINSIC(UnsafePutLongVolatile)
UNIMPLEMENTED_INTRINSIC(UnsafeCASInt)
UNIMPLEMENTED_INTRINSIC(UnsafeCASLong)
UNIMPLEMENTED_INTRINSIC(UnsafeCASObject)
UNIMPLEMENTED_INTRINSIC(StringCharAt)
UNIMPLEMENTED_INTRINSIC(StringCompareTo)
UNIMPLEMENTED_INTRINSIC(StringIndexOf)
UNIMPLEMENTED_INTRINSIC(StringIndexOfAfter)
UNIMPLEMENTED_INTRINSIC(StringNewStringFromBytes)
UNIMPLEMENTED_INTRINSIC(StringNewStringFromChars)
UNIMPLEMENTED_INTRINSIC(StringNewStringFromString)
UNIMPLEMENTED_INTRINSIC(LongRotateLeft)
UNIMPLEMENTED_INTRINSIC(LongRotateRight)
UNIMPLEMENTED_INTRINSIC(IntegerRotateLeft)
UNIMPLEMENTED_INTRINSIC(IntegerRotateRight)
UNIMPLEMENTED_INTRINSIC(ReferenceGetReferent)
UNIMPLEMENTED_INTRINSIC(StringGetCharsNoCheck)
UNIMPLEMENTED_INTRINSIC(SystemArrayCopyChar)
UNIMPLEMENTED_INTRINSIC(SystemArrayCopy)
#undef UNIMPLEMENTED_INTRINSIC
#undef __
} // namespace mips
} // namespace art