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dart / sdk / 150f63182e5843fe03f2d5c169336c230b69b153 / . / runtime / vm / compiler / asm_intrinsifier_x64.cc
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// Copyright (c) 2019, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h" // Needed here to get TARGET_ARCH_X64.
#if defined(TARGET_ARCH_X64)
#define SHOULD_NOT_INCLUDE_RUNTIME
#include "vm/class_id.h"
#include "vm/compiler/asm_intrinsifier.h"
#include "vm/compiler/assembler/assembler.h"
namespace dart {
namespace compiler {
// When entering intrinsics code:
// PP: Caller's ObjectPool in JIT / global ObjectPool in AOT
// CODE_REG: Callee's Code in JIT / not passed in AOT
// R10: Arguments descriptor
// TOS: Return address
// The R10 and CODE_REG registers can be destroyed only if there is no
// slow-path, i.e. if the intrinsified method always executes a return.
// The RBP register should not be modified, because it is used by the profiler.
// The PP and THR registers (see constants_x64.h) must be preserved.
#define __ assembler->
// Allocate a GrowableObjectArray using the backing array specified.
// On stack: type argument (+2), data (+1), return-address (+0).
void AsmIntrinsifier::GrowableArray_Allocate(Assembler* assembler,
Label* normal_ir_body) {
// This snippet of inlined code uses the following registers:
// RAX, RCX, R13
// and the newly allocated object is returned in RAX.
const intptr_t kTypeArgumentsOffset = 2 * target::kWordSize;
const intptr_t kArrayOffset = 1 * target::kWordSize;
// Try allocating in new space.
const Class& cls = GrowableObjectArrayClass();
__ TryAllocate(cls, normal_ir_body, Assembler::kFarJump, RAX, R13);
// Store backing array object in growable array object.
__ movq(RCX, Address(RSP, kArrayOffset)); // data argument.
// RAX is new, no barrier needed.
__ StoreCompressedIntoObjectNoBarrier(
RAX, FieldAddress(RAX, target::GrowableObjectArray::data_offset()), RCX);
// RAX: new growable array object start as a tagged pointer.
// Store the type argument field in the growable array object.
__ movq(RCX, Address(RSP, kTypeArgumentsOffset)); // type argument.
__ StoreCompressedIntoObjectNoBarrier(
RAX,
FieldAddress(RAX, target::GrowableObjectArray::type_arguments_offset()),
RCX);
// Set the length field in the growable array object to 0.
__ ZeroInitCompressedSmiField(
FieldAddress(RAX, target::GrowableObjectArray::length_offset()));
__ ret(); // returns the newly allocated object in RAX.
__ Bind(normal_ir_body);
}
// Tests if two top most arguments are smis, jumps to label not_smi if not.
// Topmost argument is in RAX.
static void TestBothArgumentsSmis(Assembler* assembler, Label* not_smi) {
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ movq(RCX, Address(RSP, +2 * target::kWordSize));
__ orq(RCX, RAX);
__ testq(RCX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, not_smi);
}
void AsmIntrinsifier::Integer_shl(Assembler* assembler, Label* normal_ir_body) {
ASSERT(kSmiTagShift == 1);
ASSERT(kSmiTag == 0);
Label overflow;
TestBothArgumentsSmis(assembler, normal_ir_body);
// Shift value is in RAX. Compare with tagged Smi.
__ OBJ(cmp)(RAX, Immediate(target::ToRawSmi(target::kSmiBits)));
__ j(ABOVE_EQUAL, normal_ir_body, Assembler::kNearJump);
__ SmiUntag(RAX);
__ movq(RCX, RAX); // Shift amount must be in RCX.
__ movq(RAX, Address(RSP, +2 * target::kWordSize)); // Value.
// Overflow test - all the shifted-out bits must be same as the sign bit.
__ movq(RDI, RAX);
__ OBJ(shl)(RAX, RCX);
__ OBJ(sar)(RAX, RCX);
__ OBJ(cmp)(RAX, RDI);
__ j(NOT_EQUAL, &overflow, Assembler::kNearJump);
__ OBJ(shl)(RAX, RCX); // Shift for result now we know there is no overflow.
// RAX is a correctly tagged Smi.
__ ret();
__ Bind(&overflow);
// Mint is rarely used on x64 (only for integers requiring 64 bit instead of
// 63 or 31 bits as represented by Smi).
__ Bind(normal_ir_body);
}
static void CompareIntegers(Assembler* assembler,
Label* normal_ir_body,
Condition true_condition) {
Label true_label;
TestBothArgumentsSmis(assembler, normal_ir_body);
// RAX contains the right argument.
__ OBJ(cmp)(Address(RSP, +2 * target::kWordSize), RAX);
__ j(true_condition, &true_label, Assembler::kNearJump);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(&true_label);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::Integer_lessThan(Assembler* assembler,
Label* normal_ir_body) {
CompareIntegers(assembler, normal_ir_body, LESS);
}
void AsmIntrinsifier::Integer_greaterThan(Assembler* assembler,
Label* normal_ir_body) {
CompareIntegers(assembler, normal_ir_body, GREATER);
}
void AsmIntrinsifier::Integer_lessEqualThan(Assembler* assembler,
Label* normal_ir_body) {
CompareIntegers(assembler, normal_ir_body, LESS_EQUAL);
}
void AsmIntrinsifier::Integer_greaterEqualThan(Assembler* assembler,
Label* normal_ir_body) {
CompareIntegers(assembler, normal_ir_body, GREATER_EQUAL);
}
// This is called for Smi and Mint receivers. The right argument
// can be Smi, Mint or double.
void AsmIntrinsifier::Integer_equalToInteger(Assembler* assembler,
Label* normal_ir_body) {
Label true_label, check_for_mint;
const intptr_t kReceiverOffset = 2;
const intptr_t kArgumentOffset = 1;
// For integer receiver '===' check first.
__ movq(RAX, Address(RSP, +kArgumentOffset * target::kWordSize));
__ movq(RCX, Address(RSP, +kReceiverOffset * target::kWordSize));
__ OBJ(cmp)(RAX, RCX);
__ j(EQUAL, &true_label, Assembler::kNearJump);
__ orq(RAX, RCX);
__ testq(RAX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, &check_for_mint, Assembler::kNearJump);
// Both arguments are smi, '===' is good enough.
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(&true_label);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
// At least one of the arguments was not Smi.
Label receiver_not_smi;
__ Bind(&check_for_mint);
__ movq(RAX, Address(RSP, +kReceiverOffset * target::kWordSize));
__ testq(RAX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, &receiver_not_smi);
// Left (receiver) is Smi, return false if right is not Double.
// Note that an instance of Mint never contains a value that can be
// represented by Smi.
__ movq(RAX, Address(RSP, +kArgumentOffset * target::kWordSize));
__ CompareClassId(RAX, kDoubleCid);
__ j(EQUAL, normal_ir_body);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(&receiver_not_smi);
// RAX:: receiver.
__ CompareClassId(RAX, kMintCid);
__ j(NOT_EQUAL, normal_ir_body);
// Receiver is Mint, return false if right is Smi.
__ movq(RAX, Address(RSP, +kArgumentOffset * target::kWordSize));
__ testq(RAX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, normal_ir_body);
// Smi == Mint -> false.
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
// TODO(srdjan): Implement Mint == Mint comparison.
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::Integer_equal(Assembler* assembler,
Label* normal_ir_body) {
Integer_equalToInteger(assembler, normal_ir_body);
}
void AsmIntrinsifier::Smi_bitLength(Assembler* assembler,
Label* normal_ir_body) {
ASSERT(kSmiTagShift == 1);
__ movq(RAX, Address(RSP, +1 * target::kWordSize)); // Index.
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RAX, RAX);
#endif
// XOR with sign bit to complement bits if value is negative.
__ movq(RCX, RAX);
__ sarq(RCX, Immediate(63)); // All 0 or all 1.
__ OBJ (xor)(RAX, RCX);
// BSR does not write the destination register if source is zero. Put a 1 in
// the Smi tag bit to ensure BSR writes to destination register.
__ orq(RAX, Immediate(kSmiTagMask));
__ bsrq(RAX, RAX);
__ SmiTag(RAX);
__ ret();
}
void AsmIntrinsifier::Bigint_lsh(Assembler* assembler, Label* normal_ir_body) {
// static void _lsh(Uint32List x_digits, int x_used, int n,
// Uint32List r_digits)
__ movq(RDI, Address(RSP, 4 * target::kWordSize)); // x_digits
__ movq(R8, Address(RSP, 3 * target::kWordSize)); // x_used is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(R8, R8);
#endif
__ subq(R8, Immediate(2)); // x_used > 0, Smi. R8 = x_used - 1, round up.
__ sarq(R8, Immediate(2)); // R8 + 1 = number of digit pairs to read.
__ movq(RCX, Address(RSP, 2 * target::kWordSize)); // n is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RCX, RCX);
#endif
__ SmiUntag(RCX);
__ movq(RBX, Address(RSP, 1 * target::kWordSize)); // r_digits
__ movq(RSI, RCX);
__ sarq(RSI, Immediate(6)); // RSI = n ~/ (2*_DIGIT_BITS).
__ leaq(RBX,
FieldAddress(RBX, RSI, TIMES_8, target::TypedData::data_offset()));
__ xorq(RAX, RAX); // RAX = 0.
__ movq(RDX,
FieldAddress(RDI, R8, TIMES_8, target::TypedData::data_offset()));
__ shldq(RAX, RDX, RCX);
__ movq(Address(RBX, R8, TIMES_8, 2 * kBytesPerBigIntDigit), RAX);
Label last;
__ cmpq(R8, Immediate(0));
__ j(EQUAL, &last, Assembler::kNearJump);
Label loop;
__ Bind(&loop);
__ movq(RAX, RDX);
__ movq(RDX, FieldAddress(RDI, R8, TIMES_8,
target::TypedData::data_offset() -
2 * kBytesPerBigIntDigit));
__ shldq(RAX, RDX, RCX);
__ movq(Address(RBX, R8, TIMES_8, 0), RAX);
__ decq(R8);
__ j(NOT_ZERO, &loop, Assembler::kNearJump);
__ Bind(&last);
__ shldq(RDX, R8, RCX); // R8 == 0.
__ movq(Address(RBX, 0), RDX);
__ LoadObject(RAX, NullObject());
__ ret();
}
void AsmIntrinsifier::Bigint_rsh(Assembler* assembler, Label* normal_ir_body) {
// static void _rsh(Uint32List x_digits, int x_used, int n,
// Uint32List r_digits)
__ movq(RDI, Address(RSP, 4 * target::kWordSize)); // x_digits
__ movq(RCX, Address(RSP, 2 * target::kWordSize)); // n is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RCX, RCX);
#endif
__ SmiUntag(RCX);
__ movq(RBX, Address(RSP, 1 * target::kWordSize)); // r_digits
__ movq(RDX, RCX);
__ sarq(RDX, Immediate(6)); // RDX = n ~/ (2*_DIGIT_BITS).
__ movq(RSI, Address(RSP, 3 * target::kWordSize)); // x_used is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RSI, RSI);
#endif
__ subq(RSI, Immediate(2)); // x_used > 0, Smi. RSI = x_used - 1, round up.
__ sarq(RSI, Immediate(2));
__ leaq(RDI,
FieldAddress(RDI, RSI, TIMES_8, target::TypedData::data_offset()));
__ subq(RSI, RDX); // RSI + 1 = number of digit pairs to read.
__ leaq(RBX,
FieldAddress(RBX, RSI, TIMES_8, target::TypedData::data_offset()));
__ negq(RSI);
__ movq(RDX, Address(RDI, RSI, TIMES_8, 0));
Label last;
__ cmpq(RSI, Immediate(0));
__ j(EQUAL, &last, Assembler::kNearJump);
Label loop;
__ Bind(&loop);
__ movq(RAX, RDX);
__ movq(RDX, Address(RDI, RSI, TIMES_8, 2 * kBytesPerBigIntDigit));
__ shrdq(RAX, RDX, RCX);
__ movq(Address(RBX, RSI, TIMES_8, 0), RAX);
__ incq(RSI);
__ j(NOT_ZERO, &loop, Assembler::kNearJump);
__ Bind(&last);
__ shrdq(RDX, RSI, RCX); // RSI == 0.
__ movq(Address(RBX, 0), RDX);
__ LoadObject(RAX, NullObject());
__ ret();
}
void AsmIntrinsifier::Bigint_absAdd(Assembler* assembler,
Label* normal_ir_body) {
// static void _absAdd(Uint32List digits, int used,
// Uint32List a_digits, int a_used,
// Uint32List r_digits)
__ movq(RDI, Address(RSP, 5 * target::kWordSize)); // digits
__ movq(R8, Address(RSP, 4 * target::kWordSize)); // used is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(R8, R8);
#endif
__ addq(R8, Immediate(2)); // used > 0, Smi. R8 = used + 1, round up.
__ sarq(R8, Immediate(2)); // R8 = number of digit pairs to process.
__ movq(RSI, Address(RSP, 3 * target::kWordSize)); // a_digits
__ movq(RCX, Address(RSP, 2 * target::kWordSize)); // a_used is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RCX, RCX);
#endif
__ addq(RCX, Immediate(2)); // a_used > 0, Smi. R8 = a_used + 1, round up.
__ sarq(RCX, Immediate(2)); // R8 = number of digit pairs to process.
__ movq(RBX, Address(RSP, 1 * target::kWordSize)); // r_digits
// Precompute 'used - a_used' now so that carry flag is not lost later.
__ subq(R8, RCX);
__ incq(R8); // To account for the extra test between loops.
__ xorq(RDX, RDX); // RDX = 0, carry flag = 0.
Label add_loop;
__ Bind(&add_loop);
// Loop (a_used+1)/2 times, RCX > 0.
__ movq(RAX,
FieldAddress(RDI, RDX, TIMES_8, target::TypedData::data_offset()));
__ adcq(RAX,
FieldAddress(RSI, RDX, TIMES_8, target::TypedData::data_offset()));
__ movq(FieldAddress(RBX, RDX, TIMES_8, target::TypedData::data_offset()),
RAX);
__ incq(RDX); // Does not affect carry flag.
__ decq(RCX); // Does not affect carry flag.
__ j(NOT_ZERO, &add_loop, Assembler::kNearJump);
Label last_carry;
__ decq(R8); // Does not affect carry flag.
__ j(ZERO, &last_carry, Assembler::kNearJump); // If used - a_used == 0.
Label carry_loop;
__ Bind(&carry_loop);
// Loop (used+1)/2 - (a_used+1)/2 times, R8 > 0.
__ movq(RAX,
FieldAddress(RDI, RDX, TIMES_8, target::TypedData::data_offset()));
__ adcq(RAX, Immediate(0));
__ movq(FieldAddress(RBX, RDX, TIMES_8, target::TypedData::data_offset()),
RAX);
__ incq(RDX); // Does not affect carry flag.
__ decq(R8); // Does not affect carry flag.
__ j(NOT_ZERO, &carry_loop, Assembler::kNearJump);
__ Bind(&last_carry);
Label done;
__ j(NOT_CARRY, &done);
__ movq(FieldAddress(RBX, RDX, TIMES_8, target::TypedData::data_offset()),
Immediate(1));
__ Bind(&done);
__ LoadObject(RAX, NullObject());
__ ret();
}
void AsmIntrinsifier::Bigint_absSub(Assembler* assembler,
Label* normal_ir_body) {
// static void _absSub(Uint32List digits, int used,
// Uint32List a_digits, int a_used,
// Uint32List r_digits)
__ movq(RDI, Address(RSP, 5 * target::kWordSize)); // digits
__ movq(R8, Address(RSP, 4 * target::kWordSize)); // used is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(R8, R8);
#endif
__ addq(R8, Immediate(2)); // used > 0, Smi. R8 = used + 1, round up.
__ sarq(R8, Immediate(2)); // R8 = number of digit pairs to process.
__ movq(RSI, Address(RSP, 3 * target::kWordSize)); // a_digits
__ movq(RCX, Address(RSP, 2 * target::kWordSize)); // a_used is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RCX, RCX);
#endif
__ addq(RCX, Immediate(2)); // a_used > 0, Smi. R8 = a_used + 1, round up.
__ sarq(RCX, Immediate(2)); // R8 = number of digit pairs to process.
__ movq(RBX, Address(RSP, 1 * target::kWordSize)); // r_digits
// Precompute 'used - a_used' now so that carry flag is not lost later.
__ subq(R8, RCX);
__ incq(R8); // To account for the extra test between loops.
__ xorq(RDX, RDX); // RDX = 0, carry flag = 0.
Label sub_loop;
__ Bind(&sub_loop);
// Loop (a_used+1)/2 times, RCX > 0.
__ movq(RAX,
FieldAddress(RDI, RDX, TIMES_8, target::TypedData::data_offset()));
__ sbbq(RAX,
FieldAddress(RSI, RDX, TIMES_8, target::TypedData::data_offset()));
__ movq(FieldAddress(RBX, RDX, TIMES_8, target::TypedData::data_offset()),
RAX);
__ incq(RDX); // Does not affect carry flag.
__ decq(RCX); // Does not affect carry flag.
__ j(NOT_ZERO, &sub_loop, Assembler::kNearJump);
Label done;
__ decq(R8); // Does not affect carry flag.
__ j(ZERO, &done, Assembler::kNearJump); // If used - a_used == 0.
Label carry_loop;
__ Bind(&carry_loop);
// Loop (used+1)/2 - (a_used+1)/2 times, R8 > 0.
__ movq(RAX,
FieldAddress(RDI, RDX, TIMES_8, target::TypedData::data_offset()));
__ sbbq(RAX, Immediate(0));
__ movq(FieldAddress(RBX, RDX, TIMES_8, target::TypedData::data_offset()),
RAX);
__ incq(RDX); // Does not affect carry flag.
__ decq(R8); // Does not affect carry flag.
__ j(NOT_ZERO, &carry_loop, Assembler::kNearJump);
__ Bind(&done);
__ LoadObject(RAX, NullObject());
__ ret();
}
void AsmIntrinsifier::Bigint_mulAdd(Assembler* assembler,
Label* normal_ir_body) {
// Pseudo code:
// static int _mulAdd(Uint32List x_digits, int xi,
// Uint32List m_digits, int i,
// Uint32List a_digits, int j, int n) {
// uint64_t x = x_digits[xi >> 1 .. (xi >> 1) + 1]; // xi is Smi and even.
// if (x == 0 || n == 0) {
// return 2;
// }
// uint64_t* mip = &m_digits[i >> 1]; // i is Smi and even.
// uint64_t* ajp = &a_digits[j >> 1]; // j is Smi and even.
// uint64_t c = 0;
// SmiUntag(n); // n is Smi and even.
// n = (n + 1)/2; // Number of pairs to process.
// do {
// uint64_t mi = *mip++;
// uint64_t aj = *ajp;
// uint128_t t = x*mi + aj + c; // 64-bit * 64-bit -> 128-bit.
// *ajp++ = low64(t);
// c = high64(t);
// } while (--n > 0);
// while (c != 0) {
// uint128_t t = *ajp + c;
// *ajp++ = low64(t);
// c = high64(t); // c == 0 or 1.
// }
// return 2;
// }
Label done;
// RBX = x, done if x == 0
__ movq(RCX, Address(RSP, 7 * target::kWordSize)); // x_digits
__ movq(RAX, Address(RSP, 6 * target::kWordSize)); // xi is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RAX, RAX);
#endif
__ movq(RBX,
FieldAddress(RCX, RAX, TIMES_2, target::TypedData::data_offset()));
__ testq(RBX, RBX);
__ j(ZERO, &done, Assembler::kNearJump);
// R8 = (SmiUntag(n) + 1)/2, no_op if n == 0
__ movq(R8, Address(RSP, 1 * target::kWordSize)); // n is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(R8, R8);
#endif
__ addq(R8, Immediate(2));
__ sarq(R8, Immediate(2)); // R8 = number of digit pairs to process.
__ j(ZERO, &done, Assembler::kNearJump);
// RDI = mip = &m_digits[i >> 1]
__ movq(RDI, Address(RSP, 5 * target::kWordSize)); // m_digits
__ movq(RAX, Address(RSP, 4 * target::kWordSize)); // i is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RAX, RAX);
#endif
__ leaq(RDI,
FieldAddress(RDI, RAX, TIMES_2, target::TypedData::data_offset()));
// RSI = ajp = &a_digits[j >> 1]
__ movq(RSI, Address(RSP, 3 * target::kWordSize)); // a_digits
__ movq(RAX, Address(RSP, 2 * target::kWordSize)); // j is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RAX, RAX);
#endif
__ leaq(RSI,
FieldAddress(RSI, RAX, TIMES_2, target::TypedData::data_offset()));
// RCX = c = 0
__ xorq(RCX, RCX);
Label muladd_loop;
__ Bind(&muladd_loop);
// x: RBX
// mip: RDI
// ajp: RSI
// c: RCX
// t: RDX:RAX (not live at loop entry)
// n: R8
// uint64_t mi = *mip++
__ movq(RAX, Address(RDI, 0));
__ addq(RDI, Immediate(2 * kBytesPerBigIntDigit));
// uint128_t t = x*mi
__ mulq(RBX); // t = RDX:RAX = RAX * RBX, 64-bit * 64-bit -> 64-bit
__ addq(RAX, RCX); // t += c
__ adcq(RDX, Immediate(0));
// uint64_t aj = *ajp; t += aj
__ addq(RAX, Address(RSI, 0));
__ adcq(RDX, Immediate(0));
// *ajp++ = low64(t)
__ movq(Address(RSI, 0), RAX);
__ addq(RSI, Immediate(2 * kBytesPerBigIntDigit));
// c = high64(t)
__ movq(RCX, RDX);
// while (--n > 0)
__ decq(R8); // --n
__ j(NOT_ZERO, &muladd_loop, Assembler::kNearJump);
__ testq(RCX, RCX);
__ j(ZERO, &done, Assembler::kNearJump);
// *ajp += c
__ addq(Address(RSI, 0), RCX);
__ j(NOT_CARRY, &done, Assembler::kNearJump);
Label propagate_carry_loop;
__ Bind(&propagate_carry_loop);
__ addq(RSI, Immediate(2 * kBytesPerBigIntDigit));
__ incq(Address(RSI, 0)); // c == 0 or 1
__ j(CARRY, &propagate_carry_loop, Assembler::kNearJump);
__ Bind(&done);
__ movq(RAX, Immediate(target::ToRawSmi(2))); // Two digits processed.
__ ret();
}
void AsmIntrinsifier::Bigint_sqrAdd(Assembler* assembler,
Label* normal_ir_body) {
// Pseudo code:
// static int _sqrAdd(Uint32List x_digits, int i,
// Uint32List a_digits, int used) {
// uint64_t* xip = &x_digits[i >> 1]; // i is Smi and even.
// uint64_t x = *xip++;
// if (x == 0) return 2;
// uint64_t* ajp = &a_digits[i]; // j == 2*i, i is Smi.
// uint64_t aj = *ajp;
// uint128_t t = x*x + aj;
// *ajp++ = low64(t);
// uint128_t c = high64(t);
// int n = ((used - i + 2) >> 2) - 1; // used and i are Smi. n: num pairs.
// while (--n >= 0) {
// uint64_t xi = *xip++;
// uint64_t aj = *ajp;
// uint192_t t = 2*x*xi + aj + c; // 2-bit * 64-bit * 64-bit -> 129-bit.
// *ajp++ = low64(t);
// c = high128(t); // 65-bit.
// }
// uint64_t aj = *ajp;
// uint128_t t = aj + c; // 64-bit + 65-bit -> 66-bit.
// *ajp++ = low64(t);
// *ajp = high64(t);
// return 2;
// }
// RDI = xip = &x_digits[i >> 1]
__ movq(RDI, Address(RSP, 4 * target::kWordSize)); // x_digits
__ movq(RAX, Address(RSP, 3 * target::kWordSize)); // i is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RAX, RAX);
#endif
__ leaq(RDI,
FieldAddress(RDI, RAX, TIMES_2, target::TypedData::data_offset()));
// RBX = x = *xip++, return if x == 0
Label x_zero;
__ movq(RBX, Address(RDI, 0));
__ cmpq(RBX, Immediate(0));
__ j(EQUAL, &x_zero);
__ addq(RDI, Immediate(2 * kBytesPerBigIntDigit));
// RSI = ajp = &a_digits[i]
__ movq(RSI, Address(RSP, 2 * target::kWordSize)); // a_digits
__ leaq(RSI,
FieldAddress(RSI, RAX, TIMES_4, target::TypedData::data_offset()));
// RDX:RAX = t = x*x + *ajp
__ movq(RAX, RBX);
__ mulq(RBX);
__ addq(RAX, Address(RSI, 0));
__ adcq(RDX, Immediate(0));
// *ajp++ = low64(t)
__ movq(Address(RSI, 0), RAX);
__ addq(RSI, Immediate(2 * kBytesPerBigIntDigit));
// int n = (used - i + 1)/2 - 1
__ OBJ(mov)(R8, Address(RSP, 1 * target::kWordSize)); // used is Smi
__ OBJ(sub)(R8, Address(RSP, 3 * target::kWordSize)); // i is Smi
__ addq(R8, Immediate(2));
__ sarq(R8, Immediate(2));
__ decq(R8); // R8 = number of digit pairs to process.
// uint128_t c = high64(t)
__ xorq(R13, R13); // R13 = high64(c) == 0
__ movq(R12, RDX); // R12 = low64(c) == high64(t)
Label loop, done;
__ Bind(&loop);
// x: RBX
// xip: RDI
// ajp: RSI
// c: R13:R12
// t: RCX:RDX:RAX (not live at loop entry)
// n: R8
// while (--n >= 0)
__ decq(R8); // --n
__ j(NEGATIVE, &done, Assembler::kNearJump);
// uint64_t xi = *xip++
__ movq(RAX, Address(RDI, 0));
__ addq(RDI, Immediate(2 * kBytesPerBigIntDigit));
// uint192_t t = RCX:RDX:RAX = 2*x*xi + aj + c
__ mulq(RBX); // RDX:RAX = RAX * RBX
__ xorq(RCX, RCX); // RCX = 0
__ shldq(RCX, RDX, Immediate(1));
__ shldq(RDX, RAX, Immediate(1));
__ shlq(RAX, Immediate(1)); // RCX:RDX:RAX <<= 1
__ addq(RAX, Address(RSI, 0)); // t += aj
__ adcq(RDX, Immediate(0));
__ adcq(RCX, Immediate(0));
__ addq(RAX, R12); // t += low64(c)
__ adcq(RDX, R13); // t += high64(c) << 64
__ adcq(RCX, Immediate(0));
// *ajp++ = low64(t)
__ movq(Address(RSI, 0), RAX);
__ addq(RSI, Immediate(2 * kBytesPerBigIntDigit));
// c = high128(t)
__ movq(R12, RDX);
__ movq(R13, RCX);
__ jmp(&loop, Assembler::kNearJump);
__ Bind(&done);
// uint128_t t = aj + c
__ addq(R12, Address(RSI, 0)); // t = c, t += *ajp
__ adcq(R13, Immediate(0));
// *ajp++ = low64(t)
// *ajp = high64(t)
__ movq(Address(RSI, 0), R12);
__ movq(Address(RSI, 2 * kBytesPerBigIntDigit), R13);
__ Bind(&x_zero);
__ movq(RAX, Immediate(target::ToRawSmi(2))); // Two digits processed.
__ ret();
}
void AsmIntrinsifier::Bigint_estimateQuotientDigit(Assembler* assembler,
Label* normal_ir_body) {
// Pseudo code:
// static int _estQuotientDigit(Uint32List args, Uint32List digits, int i) {
// uint64_t yt = args[_YT_LO .. _YT]; // _YT_LO == 0, _YT == 1.
// uint64_t* dp = &digits[(i >> 1) - 1]; // i is Smi.
// uint64_t dh = dp[0]; // dh == digits[(i >> 1) - 1 .. i >> 1].
// uint64_t qd;
// if (dh == yt) {
// qd = (DIGIT_MASK << 32) | DIGIT_MASK;
// } else {
// dl = dp[-1]; // dl == digits[(i >> 1) - 3 .. (i >> 1) - 2].
// qd = dh:dl / yt; // No overflow possible, because dh < yt.
// }
// args[_QD .. _QD_HI] = qd; // _QD == 2, _QD_HI == 3.
// return 2;
// }
// RDI = args
__ movq(RDI, Address(RSP, 3 * target::kWordSize)); // args
// RCX = yt = args[0..1]
__ movq(RCX, FieldAddress(RDI, target::TypedData::data_offset()));
// RBX = dp = &digits[(i >> 1) - 1]
__ movq(RBX, Address(RSP, 2 * target::kWordSize)); // digits
__ movq(RAX, Address(RSP, 1 * target::kWordSize)); // i is Smi and odd.
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RAX, RAX);
#endif
__ leaq(RBX, FieldAddress(
RBX, RAX, TIMES_2,
target::TypedData::data_offset() - kBytesPerBigIntDigit));
// RDX = dh = dp[0]
__ movq(RDX, Address(RBX, 0));
// RAX = qd = (DIGIT_MASK << 32) | DIGIT_MASK = -1
__ movq(RAX, Immediate(-1));
// Return qd if dh == yt
Label return_qd;
__ cmpq(RDX, RCX);
__ j(EQUAL, &return_qd, Assembler::kNearJump);
// RAX = dl = dp[-1]
__ movq(RAX, Address(RBX, -2 * kBytesPerBigIntDigit));
// RAX = qd = dh:dl / yt = RDX:RAX / RCX
__ divq(RCX);
__ Bind(&return_qd);
// args[2..3] = qd
__ movq(FieldAddress(
RDI, target::TypedData::data_offset() + 2 * kBytesPerBigIntDigit),
RAX);
__ movq(RAX, Immediate(target::ToRawSmi(2))); // Two digits processed.
__ ret();
}
void AsmIntrinsifier::Montgomery_mulMod(Assembler* assembler,
Label* normal_ir_body) {
// Pseudo code:
// static int _mulMod(Uint32List args, Uint32List digits, int i) {
// uint64_t rho = args[_RHO .. _RHO_HI]; // _RHO == 2, _RHO_HI == 3.
// uint64_t d = digits[i >> 1 .. (i >> 1) + 1]; // i is Smi and even.
// uint128_t t = rho*d;
// args[_MU .. _MU_HI] = t mod DIGIT_BASE^2; // _MU == 4, _MU_HI == 5.
// return 2;
// }
// RDI = args
__ movq(RDI, Address(RSP, 3 * target::kWordSize)); // args
// RCX = rho = args[2 .. 3]
__ movq(RCX, FieldAddress(RDI, target::TypedData::data_offset() +
2 * kBytesPerBigIntDigit));
// RAX = digits[i >> 1 .. (i >> 1) + 1]
__ movq(RBX, Address(RSP, 2 * target::kWordSize)); // digits
__ movq(RAX, Address(RSP, 1 * target::kWordSize)); // i is Smi
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RAX, RAX);
#endif
__ movq(RAX,
FieldAddress(RBX, RAX, TIMES_2, target::TypedData::data_offset()));
// RDX:RAX = t = rho*d
__ mulq(RCX);
// args[4 .. 5] = t mod DIGIT_BASE^2 = low64(t)
__ movq(FieldAddress(
RDI, target::TypedData::data_offset() + 4 * kBytesPerBigIntDigit),
RAX);
__ movq(RAX, Immediate(target::ToRawSmi(2))); // Two digits processed.
__ ret();
}
// Check if the last argument is a double, jump to label 'is_smi' if smi
// (easy to convert to double), otherwise jump to label 'not_double_smi',
// Returns the last argument in RAX.
static void TestLastArgumentIsDouble(Assembler* assembler,
Label* is_smi,
Label* not_double_smi) {
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ testq(RAX, Immediate(kSmiTagMask));
__ j(ZERO, is_smi); // Jump if Smi.
__ CompareClassId(RAX, kDoubleCid);
__ j(NOT_EQUAL, not_double_smi);
// Fall through if double.
}
// Both arguments on stack, left argument is a double, right argument is of
// unknown type. Return true or false object in RAX. Any NaN argument
// returns false. Any non-double argument causes control flow to fall through
// to the slow case (compiled method body).
static void CompareDoubles(Assembler* assembler,
Label* normal_ir_body,
Condition true_condition) {
Label is_false, is_true, is_smi, double_op;
TestLastArgumentIsDouble(assembler, &is_smi, normal_ir_body);
// Both arguments are double, right operand is in RAX.
__ movsd(XMM1, FieldAddress(RAX, target::Double::value_offset()));
__ Bind(&double_op);
__ movq(RAX, Address(RSP, +2 * target::kWordSize)); // Left argument.
__ movsd(XMM0, FieldAddress(RAX, target::Double::value_offset()));
__ comisd(XMM0, XMM1);
__ j(PARITY_EVEN, &is_false, Assembler::kNearJump); // NaN -> false;
__ j(true_condition, &is_true, Assembler::kNearJump);
// Fall through false.
__ Bind(&is_false);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(&is_true);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
__ Bind(&is_smi);
__ SmiUntag(RAX);
__ OBJ(cvtsi2sd)(XMM1, RAX);
__ jmp(&double_op);
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::Double_greaterThan(Assembler* assembler,
Label* normal_ir_body) {
CompareDoubles(assembler, normal_ir_body, ABOVE);
}
void AsmIntrinsifier::Double_greaterEqualThan(Assembler* assembler,
Label* normal_ir_body) {
CompareDoubles(assembler, normal_ir_body, ABOVE_EQUAL);
}
void AsmIntrinsifier::Double_lessThan(Assembler* assembler,
Label* normal_ir_body) {
CompareDoubles(assembler, normal_ir_body, BELOW);
}
void AsmIntrinsifier::Double_equal(Assembler* assembler,
Label* normal_ir_body) {
CompareDoubles(assembler, normal_ir_body, EQUAL);
}
void AsmIntrinsifier::Double_lessEqualThan(Assembler* assembler,
Label* normal_ir_body) {
CompareDoubles(assembler, normal_ir_body, BELOW_EQUAL);
}
// Expects left argument to be double (receiver). Right argument is unknown.
// Both arguments are on stack.
static void DoubleArithmeticOperations(Assembler* assembler,
Label* normal_ir_body,
Token::Kind kind) {
Label is_smi, double_op;
TestLastArgumentIsDouble(assembler, &is_smi, normal_ir_body);
// Both arguments are double, right operand is in RAX.
__ movsd(XMM1, FieldAddress(RAX, target::Double::value_offset()));
__ Bind(&double_op);
__ movq(RAX, Address(RSP, +2 * target::kWordSize)); // Left argument.
__ movsd(XMM0, FieldAddress(RAX, target::Double::value_offset()));
switch (kind) {
case Token::kADD:
__ addsd(XMM0, XMM1);
break;
case Token::kSUB:
__ subsd(XMM0, XMM1);
break;
case Token::kMUL:
__ mulsd(XMM0, XMM1);
break;
case Token::kDIV:
__ divsd(XMM0, XMM1);
break;
default:
UNREACHABLE();
}
const Class& double_class = DoubleClass();
__ TryAllocate(double_class, normal_ir_body, Assembler::kFarJump,
RAX, // Result register.
R13);
__ movsd(FieldAddress(RAX, target::Double::value_offset()), XMM0);
__ ret();
__ Bind(&is_smi);
__ SmiUntag(RAX);
__ OBJ(cvtsi2sd)(XMM1, RAX);
__ jmp(&double_op);
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::Double_add(Assembler* assembler, Label* normal_ir_body) {
DoubleArithmeticOperations(assembler, normal_ir_body, Token::kADD);
}
void AsmIntrinsifier::Double_mul(Assembler* assembler, Label* normal_ir_body) {
DoubleArithmeticOperations(assembler, normal_ir_body, Token::kMUL);
}
void AsmIntrinsifier::Double_sub(Assembler* assembler, Label* normal_ir_body) {
DoubleArithmeticOperations(assembler, normal_ir_body, Token::kSUB);
}
void AsmIntrinsifier::Double_div(Assembler* assembler, Label* normal_ir_body) {
DoubleArithmeticOperations(assembler, normal_ir_body, Token::kDIV);
}
void AsmIntrinsifier::Double_mulFromInteger(Assembler* assembler,
Label* normal_ir_body) {
// Only smis allowed.
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ testq(RAX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, normal_ir_body);
// Is Smi.
__ SmiUntag(RAX);
__ OBJ(cvtsi2sd)(XMM1, RAX);
__ movq(RAX, Address(RSP, +2 * target::kWordSize));
__ movsd(XMM0, FieldAddress(RAX, target::Double::value_offset()));
__ mulsd(XMM0, XMM1);
const Class& double_class = DoubleClass();
__ TryAllocate(double_class, normal_ir_body, Assembler::kFarJump,
RAX, // Result register.
R13);
__ movsd(FieldAddress(RAX, target::Double::value_offset()), XMM0);
__ ret();
__ Bind(normal_ir_body);
}
// Left is double, right is integer (Mint or Smi)
void AsmIntrinsifier::DoubleFromInteger(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ testq(RAX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, normal_ir_body);
// Is Smi.
__ SmiUntag(RAX);
__ OBJ(cvtsi2sd)(XMM0, RAX);
const Class& double_class = DoubleClass();
__ TryAllocate(double_class, normal_ir_body, Assembler::kFarJump,
RAX, // Result register.
R13);
__ movsd(FieldAddress(RAX, target::Double::value_offset()), XMM0);
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::Double_getIsNaN(Assembler* assembler,
Label* normal_ir_body) {
Label is_true;
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ movsd(XMM0, FieldAddress(RAX, target::Double::value_offset()));
__ comisd(XMM0, XMM0);
__ j(PARITY_EVEN, &is_true, Assembler::kNearJump); // NaN -> true;
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(&is_true);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
}
void AsmIntrinsifier::Double_getIsInfinite(Assembler* assembler,
Label* normal_ir_body) {
Label is_inf, done;
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ movq(RAX, FieldAddress(RAX, target::Double::value_offset()));
// Mask off the sign.
__ AndImmediate(RAX, Immediate(0x7FFFFFFFFFFFFFFFLL));
// Compare with +infinity.
__ CompareImmediate(RAX, Immediate(0x7FF0000000000000LL));
__ j(EQUAL, &is_inf, Assembler::kNearJump);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ jmp(&done);
__ Bind(&is_inf);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ Bind(&done);
__ ret();
}
void AsmIntrinsifier::Double_getIsNegative(Assembler* assembler,
Label* normal_ir_body) {
Label is_false, is_true, is_zero;
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ movsd(XMM0, FieldAddress(RAX, target::Double::value_offset()));
__ xorpd(XMM1, XMM1); // 0.0 -> XMM1.
__ comisd(XMM0, XMM1);
__ j(PARITY_EVEN, &is_false, Assembler::kNearJump); // NaN -> false.
__ j(EQUAL, &is_zero, Assembler::kNearJump); // Check for negative zero.
__ j(ABOVE_EQUAL, &is_false, Assembler::kNearJump); // >= 0 -> false.
__ Bind(&is_true);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
__ Bind(&is_false);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(&is_zero);
// Check for negative zero (get the sign bit).
__ movmskpd(RAX, XMM0);
__ testq(RAX, Immediate(1));
__ j(NOT_ZERO, &is_true, Assembler::kNearJump);
__ jmp(&is_false, Assembler::kNearJump);
}
void AsmIntrinsifier::Double_hashCode(Assembler* assembler,
Label* normal_ir_body) {
// TODO(dartbug.com/31174): Convert this to a graph intrinsic.
// Convert double value to signed 64-bit int in RAX and
// back to a double in XMM1.
__ movq(RCX, Address(RSP, +1 * target::kWordSize));
__ movsd(XMM0, FieldAddress(RCX, target::Double::value_offset()));
__ OBJ(cvttsd2si)(RAX, XMM0);
__ OBJ(cvtsi2sd)(XMM1, RAX);
// Tag the int as a Smi, making sure that it fits; this checks for
// overflow and NaN in the conversion from double to int. Conversion
// overflow from cvttsd2si is signalled with an INT64_MIN value.
ASSERT(kSmiTag == 0 && kSmiTagShift == 1);
__ OBJ(add)(RAX, RAX);
__ j(OVERFLOW, normal_ir_body, Assembler::kNearJump);
// Compare the two double values. If they are equal, we return the
// Smi tagged result immediately as the hash code.
Label double_hash;
__ comisd(XMM0, XMM1);
__ j(NOT_EQUAL, &double_hash, Assembler::kNearJump);
__ ret();
// Convert the double bits to a hash code that fits in a Smi.
__ Bind(&double_hash);
__ movq(RAX, FieldAddress(RCX, target::Double::value_offset()));
__ movq(RCX, RAX);
__ shrq(RCX, Immediate(32));
__ xorq(RAX, RCX);
__ andq(RAX, Immediate(target::kSmiMax));
__ SmiTag(RAX);
__ ret();
// Fall into the native C++ implementation.
__ Bind(normal_ir_body);
}
// var state = ((_A * (_state[kSTATE_LO])) + _state[kSTATE_HI]) & _MASK_64;
// _state[kSTATE_LO] = state & _MASK_32;
// _state[kSTATE_HI] = state >> 32;
void AsmIntrinsifier::Random_nextState(Assembler* assembler,
Label* normal_ir_body) {
const Field& state_field = LookupMathRandomStateFieldOffset();
const int64_t a_int_value = AsmIntrinsifier::kRandomAValue;
// Receiver.
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
// Field '_state'.
__ LoadCompressed(RBX,
FieldAddress(RAX, LookupFieldOffsetInBytes(state_field)));
// Addresses of _state[0] and _state[1].
const intptr_t scale =
target::Instance::ElementSizeFor(kTypedDataUint32ArrayCid);
const intptr_t offset =
target::Instance::DataOffsetFor(kTypedDataUint32ArrayCid);
Address addr_0 = FieldAddress(RBX, 0 * scale + offset);
Address addr_1 = FieldAddress(RBX, 1 * scale + offset);
__ movq(RAX, Immediate(a_int_value));
__ movl(RCX, addr_0);
__ imulq(RCX, RAX);
__ movl(RDX, addr_1);
__ addq(RDX, RCX);
__ movl(addr_0, RDX);
__ shrq(RDX, Immediate(32));
__ movl(addr_1, RDX);
ASSERT(target::ToRawSmi(0) == 0);
__ xorq(RAX, RAX);
__ ret();
}
// Identity comparison.
void AsmIntrinsifier::ObjectEquals(Assembler* assembler,
Label* normal_ir_body) {
Label is_true;
const intptr_t kReceiverOffset = 2;
const intptr_t kArgumentOffset = 1;
__ movq(RAX, Address(RSP, +kArgumentOffset * target::kWordSize));
__ OBJ(cmp)(RAX, Address(RSP, +kReceiverOffset * target::kWordSize));
__ j(EQUAL, &is_true, Assembler::kNearJump);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(&is_true);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
}
static void RangeCheck(Assembler* assembler,
Register reg,
intptr_t low,
intptr_t high,
Condition cc,
Label* target) {
__ subq(reg, Immediate(low));
__ cmpq(reg, Immediate(high - low));
__ j(cc, target);
}
const Condition kIfNotInRange = ABOVE;
const Condition kIfInRange = BELOW_EQUAL;
static void JumpIfInteger(Assembler* assembler, Register cid, Label* target) {
RangeCheck(assembler, cid, kSmiCid, kMintCid, kIfInRange, target);
}
static void JumpIfNotInteger(Assembler* assembler,
Register cid,
Label* target) {
RangeCheck(assembler, cid, kSmiCid, kMintCid, kIfNotInRange, target);
}
static void JumpIfString(Assembler* assembler, Register cid, Label* target) {
RangeCheck(assembler, cid, kOneByteStringCid, kExternalTwoByteStringCid,
kIfInRange, target);
}
static void JumpIfNotString(Assembler* assembler, Register cid, Label* target) {
RangeCheck(assembler, cid, kOneByteStringCid, kExternalTwoByteStringCid,
kIfNotInRange, target);
}
static void JumpIfNotList(Assembler* assembler, Register cid, Label* target) {
RangeCheck(assembler, cid, kArrayCid, kGrowableObjectArrayCid, kIfNotInRange,
target);
}
static void JumpIfType(Assembler* assembler, Register cid, Label* target) {
RangeCheck(assembler, cid, kTypeCid, kFunctionTypeCid, kIfInRange, target);
}
static void JumpIfNotType(Assembler* assembler, Register cid, Label* target) {
RangeCheck(assembler, cid, kTypeCid, kFunctionTypeCid, kIfNotInRange, target);
}
// Return type quickly for simple types (not parameterized and not signature).
void AsmIntrinsifier::ObjectRuntimeType(Assembler* assembler,
Label* normal_ir_body) {
Label use_declaration_type, not_integer, not_double, not_string;
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ LoadClassIdMayBeSmi(RCX, RAX);
// RCX: untagged cid of instance (RAX).
__ cmpq(RCX, Immediate(kClosureCid));
__ j(EQUAL, normal_ir_body); // Instance is a closure.
__ cmpl(RCX, Immediate(kNumPredefinedCids));
__ j(ABOVE, &use_declaration_type);
// If object is a instance of _Double return double type.
__ cmpl(RCX, Immediate(kDoubleCid));
__ j(NOT_EQUAL, &not_double);
__ LoadIsolateGroup(RAX);
__ movq(RAX, Address(RAX, target::IsolateGroup::object_store_offset()));
__ movq(RAX, Address(RAX, target::ObjectStore::double_type_offset()));
__ ret();
__ Bind(&not_double);
// If object is an integer (smi, mint or bigint) return int type.
__ movl(RAX, RCX);
JumpIfNotInteger(assembler, RAX, &not_integer);
__ LoadIsolateGroup(RAX);
__ movq(RAX, Address(RAX, target::IsolateGroup::object_store_offset()));
__ movq(RAX, Address(RAX, target::ObjectStore::int_type_offset()));
__ ret();
__ Bind(&not_integer);
// If object is a string (one byte, two byte or external variants) return
// string type.
__ movq(RAX, RCX);
JumpIfNotString(assembler, RAX, &not_string);
__ LoadIsolateGroup(RAX);
__ movq(RAX, Address(RAX, target::IsolateGroup::object_store_offset()));
__ movq(RAX, Address(RAX, target::ObjectStore::string_type_offset()));
__ ret();
__ Bind(&not_string);
// If object is a type or function type, return Dart type.
__ movq(RAX, RCX);
JumpIfNotType(assembler, RAX, &use_declaration_type);
__ LoadIsolateGroup(RAX);
__ movq(RAX, Address(RAX, target::IsolateGroup::object_store_offset()));
__ movq(RAX, Address(RAX, target::ObjectStore::type_type_offset()));
__ ret();
// Object is neither double, nor integer, nor string, nor type.
__ Bind(&use_declaration_type);
__ LoadClassById(RDI, RCX);
__ movzxw(RCX, FieldAddress(RDI, target::Class::num_type_arguments_offset()));
__ cmpq(RCX, Immediate(0));
__ j(NOT_EQUAL, normal_ir_body, Assembler::kNearJump);
__ LoadCompressed(
RAX, FieldAddress(RDI, target::Class::declaration_type_offset()));
__ CompareObject(RAX, NullObject());
__ j(EQUAL, normal_ir_body, Assembler::kNearJump); // Not yet set.
__ ret();
__ Bind(normal_ir_body);
}
// Compares cid1 and cid2 to see if they're syntactically equivalent. If this
// can be determined by this fast path, it jumps to either equal_* or not_equal.
// If classes are equivalent but may be generic, then jumps to
// equal_may_be_generic. Clobbers scratch.
static void EquivalentClassIds(Assembler* assembler,
Label* normal_ir_body,
Label* equal_may_be_generic,
Label* equal_not_generic,
Label* not_equal,
Register cid1,
Register cid2,
Register scratch,
bool testing_instance_cids) {
Label not_integer, not_integer_or_string, not_integer_or_string_or_list;
// Check if left hand side is a closure. Closures are handled in the runtime.
__ cmpq(cid1, Immediate(kClosureCid));
__ j(EQUAL, normal_ir_body);
// Check whether class ids match. If class ids don't match types may still be
// considered equivalent (e.g. multiple string implementation classes map to a
// single String type).
__ cmpq(cid1, cid2);
__ j(EQUAL, equal_may_be_generic);
// Class ids are different. Check if we are comparing two string types (with
// different representations), two integer types, two list types or two type
// types.
__ cmpq(cid1, Immediate(kNumPredefinedCids));
__ j(ABOVE_EQUAL, not_equal);
// Check if both are integer types.
__ movq(scratch, cid1);
JumpIfNotInteger(assembler, scratch, &not_integer);
// First type is an integer. Check if the second is an integer too.
__ movq(scratch, cid2);
JumpIfInteger(assembler, scratch, equal_not_generic);
// Integer types are only equivalent to other integer types.
__ jmp(not_equal);
__ Bind(&not_integer);
// Check if both are String types.
__ movq(scratch, cid1);
JumpIfNotString(assembler, scratch,
testing_instance_cids ? &not_integer_or_string : not_equal);
// First type is a String. Check if the second is a String too.
__ movq(scratch, cid2);
JumpIfString(assembler, scratch, equal_not_generic);
// String types are only equivalent to other String types.
__ jmp(not_equal);
if (testing_instance_cids) {
__ Bind(&not_integer_or_string);
// Check if both are List types.
__ movq(scratch, cid1);
JumpIfNotList(assembler, scratch, &not_integer_or_string_or_list);
// First type is a List. Check if the second is a List too.
__ movq(scratch, cid2);
JumpIfNotList(assembler, scratch, not_equal);
ASSERT(compiler::target::Array::type_arguments_offset() ==
compiler::target::GrowableObjectArray::type_arguments_offset());
__ jmp(equal_may_be_generic);
__ Bind(&not_integer_or_string_or_list);
// Check if the first type is a Type. If it is not then types are not
// equivalent because they have different class ids and they are not String
// or integer or List or Type.
__ movq(scratch, cid1);
JumpIfNotType(assembler, scratch, not_equal);
// First type is a Type. Check if the second is a Type too.
__ movq(scratch, cid2);
JumpIfType(assembler, scratch, equal_not_generic);
// Type types are only equivalent to other Type types.
__ jmp(not_equal);
}
}
void AsmIntrinsifier::ObjectHaveSameRuntimeType(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RAX, Address(RSP, +1 * target::kWordSize));
__ LoadClassIdMayBeSmi(RCX, RAX);
__ movq(RAX, Address(RSP, +2 * target::kWordSize));
__ LoadClassIdMayBeSmi(RDX, RAX);
Label equal_may_be_generic, equal, not_equal;
EquivalentClassIds(assembler, normal_ir_body, &equal_may_be_generic, &equal,
&not_equal, RCX, RDX, RAX,
/* testing_instance_cids = */ true);
__ Bind(&equal_may_be_generic);
// Classes are equivalent and neither is a closure class.
// Check if there are no type arguments. In this case we can return true.
// Otherwise fall through into the runtime to handle comparison.
__ LoadClassById(RAX, RCX);
__ movl(
RAX,
FieldAddress(
RAX,
target::Class::host_type_arguments_field_offset_in_words_offset()));
__ cmpl(RAX, Immediate(target::Class::kNoTypeArguments));
__ j(EQUAL, &equal);
// Compare type arguments, host_type_arguments_field_offset_in_words in RAX.
__ movq(RCX, Address(RSP, +1 * target::kWordSize));
__ movq(RDX, Address(RSP, +2 * target::kWordSize));
__ OBJ(mov)(RCX, FieldAddress(RCX, RAX, TIMES_COMPRESSED_WORD_SIZE, 0));
__ OBJ(mov)(RDX, FieldAddress(RDX, RAX, TIMES_COMPRESSED_WORD_SIZE, 0));
__ OBJ(cmp)(RCX, RDX);
__ j(NOT_EQUAL, normal_ir_body, Assembler::kNearJump);
// Fall through to equal case if type arguments are equal.
__ Bind(&equal);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
__ Bind(&not_equal);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::String_getHashCode(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RAX, Address(RSP, +1 * target::kWordSize)); // String object.
__ movl(RAX, FieldAddress(RAX, target::String::hash_offset()));
ASSERT(kSmiTag == 0);
ASSERT(kSmiTagShift == 1);
__ addq(RAX, RAX); // Smi tag RAX, setting Z flag.
__ j(ZERO, normal_ir_body, Assembler::kNearJump);
__ ret();
__ Bind(normal_ir_body);
// Hash not yet computed.
}
void AsmIntrinsifier::Type_getHashCode(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RAX, Address(RSP, +1 * target::kWordSize)); // Type object.
__ LoadCompressed(RAX, FieldAddress(RAX, target::Type::hash_offset()));
ASSERT(kSmiTag == 0);
ASSERT(kSmiTagShift == 1);
__ testq(RAX, RAX);
__ j(ZERO, normal_ir_body, Assembler::kNearJump);
__ ret();
__ Bind(normal_ir_body);
// Hash not yet computed.
}
void AsmIntrinsifier::Type_equality(Assembler* assembler,
Label* normal_ir_body) {
Label equal, not_equal, equiv_cids_may_be_generic, equiv_cids, check_legacy;
__ movq(RCX, Address(RSP, +1 * target::kWordSize));
__ movq(RDX, Address(RSP, +2 * target::kWordSize));
__ OBJ(cmp)(RCX, RDX);
__ j(EQUAL, &equal);
// RCX might not be a Type object, so check that first (RDX should be though,
// since this is a method on the Type class).
__ LoadClassIdMayBeSmi(RAX, RCX);
__ cmpq(RAX, Immediate(kTypeCid));
__ j(NOT_EQUAL, normal_ir_body);
// Check if types are syntactically equal.
__ LoadTypeClassId(RDI, RCX);
__ LoadTypeClassId(RSI, RDX);
// We are not testing instance cids, but type class cids of Type instances.
EquivalentClassIds(assembler, normal_ir_body, &equiv_cids_may_be_generic,
&equiv_cids, &not_equal, RDI, RSI, RAX,
/* testing_instance_cids = */ false);
__ Bind(&equiv_cids_may_be_generic);
// Compare type arguments in Type instances.
__ LoadCompressed(RDI, FieldAddress(RCX, target::Type::arguments_offset()));
__ LoadCompressed(RSI, FieldAddress(RDX, target::Type::arguments_offset()));
__ cmpq(RDI, RSI);
__ j(NOT_EQUAL, normal_ir_body, Assembler::kNearJump);
// Fall through to check nullability if type arguments are equal.
// Check nullability.
__ Bind(&equiv_cids);
__ movzxb(RCX, FieldAddress(RCX, target::Type::nullability_offset()));
__ movzxb(RDX, FieldAddress(RDX, target::Type::nullability_offset()));
__ cmpq(RCX, RDX);
__ j(NOT_EQUAL, &check_legacy, Assembler::kNearJump);
// Fall through to equal case if nullability is strictly equal.
__ Bind(&equal);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
// At this point the nullabilities are different, so they can only be
// syntactically equivalent if they're both either kNonNullable or kLegacy.
// These are the two largest values of the enum, so we can just do a < check.
ASSERT(target::Nullability::kNullable < target::Nullability::kNonNullable &&
target::Nullability::kNonNullable < target::Nullability::kLegacy);
__ Bind(&check_legacy);
__ cmpq(RCX, Immediate(target::Nullability::kNonNullable));
__ j(LESS, &not_equal, Assembler::kNearJump);
__ cmpq(RDX, Immediate(target::Nullability::kNonNullable));
__ j(GREATER_EQUAL, &equal, Assembler::kNearJump);
__ Bind(&not_equal);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::FunctionType_getHashCode(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RAX, Address(RSP, +1 * target::kWordSize)); // FunctionType object.
__ LoadCompressed(RAX,
FieldAddress(RAX, target::FunctionType::hash_offset()));
ASSERT(kSmiTag == 0);
ASSERT(kSmiTagShift == 1);
__ testq(RAX, RAX);
__ j(ZERO, normal_ir_body, Assembler::kNearJump);
__ ret();
__ Bind(normal_ir_body);
// Hash not yet computed.
}
void AsmIntrinsifier::FunctionType_equality(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RCX, Address(RSP, +1 * target::kWordSize));
__ movq(RDX, Address(RSP, +2 * target::kWordSize));
__ OBJ(cmp)(RCX, RDX);
__ j(NOT_EQUAL, normal_ir_body);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
__ Bind(normal_ir_body);
}
// Keep in sync with Instance::IdentityHashCode.
// Note int and double never reach here because they override _identityHashCode.
// Special cases are also not needed for null or bool because they were pre-set
// during VM isolate finalization.
void AsmIntrinsifier::Object_getHash(Assembler* assembler,
Label* normal_ir_body) {
Label not_yet_computed;
__ movq(RAX, Address(RSP, +1 * target::kWordSize)); // Object.
__ movl(RAX, FieldAddress(RAX, target::Object::tags_offset() +
target::UntaggedObject::kHashTagPos /
kBitsPerByte));
__ cmpl(RAX, Immediate(0));
__ j(EQUAL, &not_yet_computed, Assembler::kNearJump);
__ SmiTag(RAX);
__ ret();
__ Bind(&not_yet_computed);
__ movq(RCX, Address(THR, target::Thread::random_offset()));
__ movq(RBX, RCX);
__ andq(RCX, Immediate(0xffffffff)); // state_lo
__ shrq(RBX, Immediate(32)); // state_hi
__ imulq(RCX, Immediate(0xffffda61)); // A
__ addq(RCX, RBX); // new_state = (A* state_lo) + state_hi
__ movq(Address(THR, target::Thread::random_offset()), RCX);
__ andq(RCX, Immediate(0x3fffffff));
__ cmpl(RCX, Immediate(0));
__ j(EQUAL, &not_yet_computed);
__ movq(RBX, Address(RSP, +1 * target::kWordSize)); // Object.
__ MoveRegister(RDX, RCX);
__ shlq(RDX, Immediate(32));
Label retry, success, already_in_rax;
__ Bind(&retry);
// RAX is used by "cmpxchgq" as comparison value (if comparison succeeds the
// store is performed).
__ movq(RAX, FieldAddress(RBX, 0));
__ TestImmediate(RAX, Immediate(0xffffffff00000000));
__ BranchIf(NOT_ZERO, &already_in_rax);
__ MoveRegister(RSI, RAX);
__ orq(RSI, RDX);
__ LockCmpxchgq(FieldAddress(RBX, 0), RSI);
__ BranchIf(NOT_ZERO, &retry);
// Fall-through with RCX containing new hash value (untagged)
__ Bind(&success);
__ SmiTag(RCX);
__ MoveRegister(RAX, RCX);
__ Ret();
__ Bind(&already_in_rax);
__ shrq(RAX, Immediate(32));
__ SmiTag(RAX);
__ Ret();
}
void GenerateSubstringMatchesSpecialization(Assembler* assembler,
intptr_t receiver_cid,
intptr_t other_cid,
Label* return_true,
Label* return_false) {
__ SmiUntag(RBX);
__ LoadCompressedSmi(R8, FieldAddress(RAX, target::String::length_offset()));
__ SmiUntag(R8);
__ LoadCompressedSmi(R9, FieldAddress(RCX, target::String::length_offset()));
__ SmiUntag(R9);
// if (other.length == 0) return true;
__ testq(R9, R9);
__ j(ZERO, return_true);
// if (start < 0) return false;
__ testq(RBX, RBX);
__ j(SIGN, return_false);
// if (start + other.length > this.length) return false;
__ movq(R11, RBX);
__ addq(R11, R9);
__ cmpq(R11, R8);
__ j(GREATER, return_false);
__ LoadImmediate(R11, Immediate(0)); // i = 0
// do
Label loop;
__ Bind(&loop);
// this.codeUnitAt(i + start)
// clobbering this.length
__ movq(R8, R11);
__ addq(R8, RBX);
if (receiver_cid == kOneByteStringCid) {
__ movzxb(R12, FieldAddress(RAX, R8, TIMES_1,
target::OneByteString::data_offset()));
} else {
ASSERT(receiver_cid == kTwoByteStringCid);
__ movzxw(R12, FieldAddress(RAX, R8, TIMES_2,
target::TwoByteString::data_offset()));
}
// other.codeUnitAt(i)
if (other_cid == kOneByteStringCid) {
__ movzxb(R13, FieldAddress(RCX, R11, TIMES_1,
target::OneByteString::data_offset()));
} else {
ASSERT(other_cid == kTwoByteStringCid);
__ movzxw(R13, FieldAddress(RCX, R11, TIMES_2,
target::TwoByteString::data_offset()));
}
__ cmpq(R12, R13);
__ j(NOT_EQUAL, return_false);
// i++, while (i < len)
__ addq(R11, Immediate(1));
__ cmpq(R11, R9);
__ j(LESS, &loop, Assembler::kNearJump);
__ jmp(return_true);
}
// bool _substringMatches(int start, String other)
// This intrinsic handles a OneByteString or TwoByteString receiver with a
// OneByteString other.
void AsmIntrinsifier::StringBaseSubstringMatches(Assembler* assembler,
Label* normal_ir_body) {
Label return_true, return_false, try_two_byte;
__ movq(RAX, Address(RSP, +3 * target::kWordSize)); // receiver
__ movq(RBX, Address(RSP, +2 * target::kWordSize)); // start
__ movq(RCX, Address(RSP, +1 * target::kWordSize)); // other
__ testq(RBX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, normal_ir_body); // 'start' is not Smi.
__ CompareClassId(RCX, kOneByteStringCid);
__ j(NOT_EQUAL, normal_ir_body);
__ CompareClassId(RAX, kOneByteStringCid);
__ j(NOT_EQUAL, &try_two_byte);
GenerateSubstringMatchesSpecialization(assembler, kOneByteStringCid,
kOneByteStringCid, &return_true,
&return_false);
__ Bind(&try_two_byte);
__ CompareClassId(RAX, kTwoByteStringCid);
__ j(NOT_EQUAL, normal_ir_body);
GenerateSubstringMatchesSpecialization(assembler, kTwoByteStringCid,
kOneByteStringCid, &return_true,
&return_false);
__ Bind(&return_true);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
__ Bind(&return_false);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::StringBaseCharAt(Assembler* assembler,
Label* normal_ir_body) {
Label try_two_byte_string;
__ movq(RCX, Address(RSP, +1 * target::kWordSize)); // Index.
__ movq(RAX, Address(RSP, +2 * target::kWordSize)); // String.
__ testq(RCX, Immediate(kSmiTagMask));
__ j(NOT_ZERO, normal_ir_body); // Non-smi index.
// Range check.
__ OBJ(cmp)(RCX, FieldAddress(RAX, target::String::length_offset()));
// Runtime throws exception.
__ j(ABOVE_EQUAL, normal_ir_body);
__ CompareClassId(RAX, kOneByteStringCid);
__ j(NOT_EQUAL, &try_two_byte_string, Assembler::kNearJump);
__ SmiUntag(RCX);
__ movzxb(RCX, FieldAddress(RAX, RCX, TIMES_1,
target::OneByteString::data_offset()));
__ cmpq(RCX, Immediate(target::Symbols::kNumberOfOneCharCodeSymbols));
__ j(GREATER_EQUAL, normal_ir_body);
__ movq(RAX,
Address(THR, target::Thread::predefined_symbols_address_offset()));
__ movq(RAX, Address(RAX, RCX, TIMES_8,
target::Symbols::kNullCharCodeSymbolOffset *
target::kWordSize));
__ ret();
__ Bind(&try_two_byte_string);
__ CompareClassId(RAX, kTwoByteStringCid);
__ j(NOT_EQUAL, normal_ir_body);
ASSERT(kSmiTagShift == 1);
#if defined(DART_COMPRESSED_POINTERS)
// The upper half of a compressed Smi contains undefined bits, but no x64
// addressing mode will ignore these bits. We have already checked the index
// is positive, so we just clear the upper bits, which is shorter than movsxd.
__ orl(RCX, RCX);
#endif
__ movzxw(RCX, FieldAddress(RAX, RCX, TIMES_1,
target::OneByteString::data_offset()));
__ cmpq(RCX, Immediate(target::Symbols::kNumberOfOneCharCodeSymbols));
__ j(GREATER_EQUAL, normal_ir_body);
__ movq(RAX,
Address(THR, target::Thread::predefined_symbols_address_offset()));
__ movq(RAX, Address(RAX, RCX, TIMES_8,
target::Symbols::kNullCharCodeSymbolOffset *
target::kWordSize));
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::StringBaseIsEmpty(Assembler* assembler,
Label* normal_ir_body) {
Label is_true;
// Get length.
__ movq(RAX, Address(RSP, +1 * target::kWordSize)); // String object.
__ LoadCompressedSmi(RAX, FieldAddress(RAX, target::String::length_offset()));
__ OBJ(cmp)(RAX, Immediate(target::ToRawSmi(0)));
__ j(EQUAL, &is_true, Assembler::kNearJump);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(&is_true);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
}
void AsmIntrinsifier::OneByteString_getHashCode(Assembler* assembler,
Label* normal_ir_body) {
Label compute_hash;
__ movq(
RBX,
Address(RSP, +1 * target::kWordSize)); // target::OneByteString object.
__ movl(RAX, FieldAddress(RBX, target::String::hash_offset()));
__ cmpq(RAX, Immediate(0));
__ j(EQUAL, &compute_hash, Assembler::kNearJump);
__ SmiTag(RAX);
__ ret();
__ Bind(&compute_hash);
// Hash not yet computed, use algorithm of class StringHasher.
__ LoadCompressedSmi(RCX, FieldAddress(RBX, target::String::length_offset()));
__ SmiUntag(RCX);
__ xorq(RAX, RAX);
__ xorq(RDI, RDI);
// RBX: Instance of target::OneByteString.
// RCX: String length, untagged integer.
// RDI: Loop counter, untagged integer.
// RAX: Hash code, untagged integer.
Label loop, done, set_hash_code;
__ Bind(&loop);
__ cmpq(RDI, RCX);
__ j(EQUAL, &done, Assembler::kNearJump);
// Add to hash code: (hash_ is uint32)
// hash_ += ch;
// hash_ += hash_ << 10;
// hash_ ^= hash_ >> 6;
// Get one characters (ch).
__ movzxb(RDX, FieldAddress(RBX, RDI, TIMES_1,
target::OneByteString::data_offset()));
// RDX: ch and temporary.
__ addl(RAX, RDX);
__ movq(RDX, RAX);
__ shll(RDX, Immediate(10));
__ addl(RAX, RDX);
__ movq(RDX, RAX);
__ shrl(RDX, Immediate(6));
__ xorl(RAX, RDX);
__ incq(RDI);
__ jmp(&loop, Assembler::kNearJump);
__ Bind(&done);
// Finalize:
// hash_ += hash_ << 3;
// hash_ ^= hash_ >> 11;
// hash_ += hash_ << 15;
__ movq(RDX, RAX);
__ shll(RDX, Immediate(3));
__ addl(RAX, RDX);
__ movq(RDX, RAX);
__ shrl(RDX, Immediate(11));
__ xorl(RAX, RDX);
__ movq(RDX, RAX);
__ shll(RDX, Immediate(15));
__ addl(RAX, RDX);
// hash_ = hash_ & ((static_cast<intptr_t>(1) << bits) - 1);
__ andl(
RAX,
Immediate(((static_cast<intptr_t>(1) << target::String::kHashBits) - 1)));
// return hash_ == 0 ? 1 : hash_;
__ cmpq(RAX, Immediate(0));
__ j(NOT_EQUAL, &set_hash_code, Assembler::kNearJump);
__ incq(RAX);
__ Bind(&set_hash_code);
__ shlq(RAX, Immediate(target::UntaggedObject::kHashTagPos));
// lock+orq is an atomic read-modify-write.
__ lock();
__ orq(FieldAddress(RBX, target::Object::tags_offset()), RAX);
__ sarq(RAX, Immediate(target::UntaggedObject::kHashTagPos));
__ SmiTag(RAX);
__ ret();
}
// Allocates a _OneByteString or _TwoByteString. The content is not initialized.
// 'length_reg' contains the desired length as a _Smi or _Mint.
// Returns new string as tagged pointer in RAX.
static void TryAllocateString(Assembler* assembler,
classid_t cid,
Label* ok,
Label* failure,
Register length_reg) {
ASSERT(cid == kOneByteStringCid || cid == kTwoByteStringCid);
// _Mint length: call to runtime to produce error.
__ BranchIfNotSmi(length_reg, failure);
// negative length: call to runtime to produce error.
__ cmpq(length_reg, Immediate(0));
__ j(LESS, failure);
NOT_IN_PRODUCT(__ MaybeTraceAllocation(cid, failure, Assembler::kFarJump));
if (length_reg != RDI) {
__ movq(RDI, length_reg);
}
Label pop_and_fail, not_zero_length;
__ pushq(RDI); // Preserve length.
if (cid == kOneByteStringCid) {
// Untag length.
__ SmiUntag(RDI);
} else {
// Untag length and multiply by element size -> no-op.
ASSERT(kSmiTagSize == 1);
}
const intptr_t fixed_size_plus_alignment_padding =
target::String::InstanceSize() +
target::ObjectAlignment::kObjectAlignment - 1;
__ addq(RDI, Immediate(fixed_size_plus_alignment_padding));
__ andq(RDI, Immediate(-target::ObjectAlignment::kObjectAlignment));
__ movq(RAX, Address(THR, target::Thread::top_offset()));
// RDI: allocation size.
__ movq(RCX, RAX);
__ addq(RCX, RDI);
__ j(CARRY, &pop_and_fail);
// Check if the allocation fits into the remaining space.
// RAX: potential new object start.
// RCX: potential next object start.
// RDI: allocation size.
__ cmpq(RCX, Address(THR, target::Thread::end_offset()));
__ j(ABOVE_EQUAL, &pop_and_fail);
// Successfully allocated the object(s), now update top to point to
// next object start and initialize the object.
__ movq(Address(THR, target::Thread::top_offset()), RCX);
__ addq(RAX, Immediate(kHeapObjectTag));
// Initialize the tags.
// RAX: new object start as a tagged pointer.
// RDI: allocation size.
{
Label size_tag_overflow, done;
__ cmpq(RDI, Immediate(target::UntaggedObject::kSizeTagMaxSizeTag));
__ j(ABOVE, &size_tag_overflow, Assembler::kNearJump);
__ shlq(RDI, Immediate(target::UntaggedObject::kTagBitsSizeTagPos -
target::ObjectAlignment::kObjectAlignmentLog2));
__ jmp(&done, Assembler::kNearJump);
__ Bind(&size_tag_overflow);
__ xorq(RDI, RDI);
__ Bind(&done);
// Get the class index and insert it into the tags.
// This also clears the hash, which is in the high bits of the tags.
const uword tags =
target::MakeTagWordForNewSpaceObject(cid, /*instance_size=*/0);
__ orq(RDI, Immediate(tags));
__ movq(FieldAddress(RAX, target::Object::tags_offset()), RDI); // Tags.
}
// Set the length field.
__ popq(RDI);
__ StoreCompressedIntoObjectNoBarrier(
RAX, FieldAddress(RAX, target::String::length_offset()), RDI);
__ jmp(ok, Assembler::kNearJump);
__ Bind(&pop_and_fail);
__ popq(RDI);
__ jmp(failure);
}
// Arg0: target::OneByteString (receiver).
// Arg1: Start index as Smi.
// Arg2: End index as Smi.
// The indexes must be valid.
void AsmIntrinsifier::OneByteString_substringUnchecked(Assembler* assembler,
Label* normal_ir_body) {
const intptr_t kStringOffset = 3 * target::kWordSize;
const intptr_t kStartIndexOffset = 2 * target::kWordSize;
const intptr_t kEndIndexOffset = 1 * target::kWordSize;
Label ok;
__ movq(RSI, Address(RSP, +kStartIndexOffset));
__ movq(RDI, Address(RSP, +kEndIndexOffset));
__ orq(RSI, RDI);
__ testq(RSI, Immediate(kSmiTagMask));
__ j(NOT_ZERO, normal_ir_body); // 'start', 'end' not Smi.
__ subq(RDI, Address(RSP, +kStartIndexOffset));
TryAllocateString(assembler, kOneByteStringCid, &ok, normal_ir_body, RDI);
__ Bind(&ok);
// RAX: new string as tagged pointer.
// Copy string.
__ movq(RSI, Address(RSP, +kStringOffset));
__ movq(RBX, Address(RSP, +kStartIndexOffset));
__ SmiUntag(RBX);
__ leaq(RSI, FieldAddress(RSI, RBX, TIMES_1,
target::OneByteString::data_offset()));
// RSI: Start address to copy from (untagged).
// RBX: Untagged start index.
__ movq(RCX, Address(RSP, +kEndIndexOffset));
__ SmiUntag(RCX);
__ subq(RCX, RBX);
__ xorq(RDX, RDX);
// RSI: Start address to copy from (untagged).
// RCX: Untagged number of bytes to copy.
// RAX: Tagged result string
// RDX: Loop counter.
// RBX: Scratch register.
Label loop, check;
__ jmp(&check, Assembler::kNearJump);
__ Bind(&loop);
__ movzxb(RBX, Address(RSI, RDX, TIMES_1, 0));
__ movb(FieldAddress(RAX, RDX, TIMES_1, target::OneByteString::data_offset()),
RBX);
__ incq(RDX);
__ Bind(&check);
__ cmpq(RDX, RCX);
__ j(LESS, &loop, Assembler::kNearJump);
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::WriteIntoOneByteString(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RCX, Address(RSP, +1 * target::kWordSize)); // Value.
__ movq(RBX, Address(RSP, +2 * target::kWordSize)); // Index.
__ movq(RAX, Address(RSP, +3 * target::kWordSize)); // target::OneByteString.
__ SmiUntag(RBX);
__ SmiUntag(RCX);
__ movb(FieldAddress(RAX, RBX, TIMES_1, target::OneByteString::data_offset()),
RCX);
__ ret();
}
void AsmIntrinsifier::WriteIntoTwoByteString(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RCX, Address(RSP, +1 * target::kWordSize)); // Value.
__ movq(RBX, Address(RSP, +2 * target::kWordSize)); // Index.
__ movq(RAX, Address(RSP, +3 * target::kWordSize)); // target::TwoByteString.
// Untag index and multiply by element size -> no-op.
__ SmiUntag(RCX);
#if defined(DART_COMPRESSED_POINTERS)
// The upper half of a compressed Smi contains undefined bits, but no x64
// addressing mode will ignore these bits. We know the index is positive, so
// we just clear the upper bits, which is shorter than movsxd.
__ orl(RBX, RBX);
#endif
__ movw(FieldAddress(RAX, RBX, TIMES_1, target::TwoByteString::data_offset()),
RCX);
__ ret();
}
void AsmIntrinsifier::AllocateOneByteString(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RDI, Address(RSP, +1 * target::kWordSize)); // Length.
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RDI, RDI);
#endif
Label ok;
TryAllocateString(assembler, kOneByteStringCid, &ok, normal_ir_body, RDI);
// RDI: Start address to copy from (untagged).
__ Bind(&ok);
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::AllocateTwoByteString(Assembler* assembler,
Label* normal_ir_body) {
__ movq(RDI, Address(RSP, +1 * target::kWordSize)); // Length.
#if defined(DART_COMPRESSED_POINTERS)
__ movsxd(RDI, RDI);
#endif
Label ok;
TryAllocateString(assembler, kTwoByteStringCid, &ok, normal_ir_body, RDI);
// RDI: Start address to copy from (untagged).
__ Bind(&ok);
__ ret();
__ Bind(normal_ir_body);
}
// TODO(srdjan): Add combinations (one-byte/two-byte/external strings).
static void StringEquality(Assembler* assembler,
Label* normal_ir_body,
intptr_t string_cid) {
Label is_true, is_false, loop;
__ movq(RAX, Address(RSP, +2 * target::kWordSize)); // This.
__ movq(RCX, Address(RSP, +1 * target::kWordSize)); // Other.
// Are identical?
__ OBJ(cmp)(RAX, RCX);
__ j(EQUAL, &is_true, Assembler::kNearJump);
// Is other target::OneByteString?
__ testq(RCX, Immediate(kSmiTagMask));
__ j(ZERO, &is_false); // Smi
__ CompareClassId(RCX, string_cid);
__ j(NOT_EQUAL, normal_ir_body, Assembler::kNearJump);
// Have same length?
__ LoadCompressedSmi(RDI, FieldAddress(RAX, target::String::length_offset()));
__ OBJ(cmp)(RDI, FieldAddress(RCX, target::String::length_offset()));
__ j(NOT_EQUAL, &is_false, Assembler::kNearJump);
// Check contents, no fall-through possible.
// TODO(srdjan): write a faster check.
__ SmiUntag(RDI);
__ Bind(&loop);
__ decq(RDI);
__ cmpq(RDI, Immediate(0));
__ j(LESS, &is_true, Assembler::kNearJump);
if (string_cid == kOneByteStringCid) {
__ movzxb(RBX, FieldAddress(RAX, RDI, TIMES_1,
target::OneByteString::data_offset()));
__ movzxb(RDX, FieldAddress(RCX, RDI, TIMES_1,
target::OneByteString::data_offset()));
} else if (string_cid == kTwoByteStringCid) {
__ movzxw(RBX, FieldAddress(RAX, RDI, TIMES_2,
target::TwoByteString::data_offset()));
__ movzxw(RDX, FieldAddress(RCX, RDI, TIMES_2,
target::TwoByteString::data_offset()));
} else {
UNIMPLEMENTED();
}
__ cmpq(RBX, RDX);
__ j(NOT_EQUAL, &is_false, Assembler::kNearJump);
__ jmp(&loop, Assembler::kNearJump);
__ Bind(&is_true);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
__ Bind(&is_false);
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
__ Bind(normal_ir_body);
}
void AsmIntrinsifier::OneByteString_equality(Assembler* assembler,
Label* normal_ir_body) {
StringEquality(assembler, normal_ir_body, kOneByteStringCid);
}
void AsmIntrinsifier::TwoByteString_equality(Assembler* assembler,
Label* normal_ir_body) {
StringEquality(assembler, normal_ir_body, kTwoByteStringCid);
}
void AsmIntrinsifier::IntrinsifyRegExpExecuteMatch(Assembler* assembler,
Label* normal_ir_body,
bool sticky) {
if (FLAG_interpret_irregexp) return;
static const intptr_t kRegExpParamOffset = 3 * target::kWordSize;
static const intptr_t kStringParamOffset = 2 * target::kWordSize;
// start_index smi is located at offset 1.
// Incoming registers:
// RAX: Function. (Will be loaded with the specialized matcher function.)
// RCX: Unknown. (Must be GC safe on tail call.)
// R10: Arguments descriptor. (Will be preserved.)
// Load the specialized function pointer into RAX. Leverage the fact the
// string CIDs as well as stored function pointers are in sequence.
__ movq(RBX, Address(RSP, kRegExpParamOffset));
__ movq(RDI, Address(RSP, kStringParamOffset));
__ LoadClassId(RDI, RDI);
__ SubImmediate(RDI, Immediate(kOneByteStringCid));
#if !defined(DART_COMPRESSED_POINTERS)
__ movq(RAX, FieldAddress(
RBX, RDI, TIMES_8,
target::RegExp::function_offset(kOneByteStringCid, sticky)));
#else
__ LoadCompressed(RAX, FieldAddress(RBX, RDI, TIMES_4,
target::RegExp::function_offset(
kOneByteStringCid, sticky)));
#endif
// Registers are now set up for the lazy compile stub. It expects the function
// in RAX, the argument descriptor in R10, and IC-Data in RCX.
__ xorq(RCX, RCX);
// Tail-call the function.
__ LoadCompressed(CODE_REG,
FieldAddress(RAX, target::Function::code_offset()));
__ movq(RDI, FieldAddress(RAX, target::Function::entry_point_offset()));
__ jmp(RDI);
}
void AsmIntrinsifier::UserTag_defaultTag(Assembler* assembler,
Label* normal_ir_body) {
__ LoadIsolate(RAX);
__ movq(RAX, Address(RAX, target::Isolate::default_tag_offset()));
__ ret();
}
void AsmIntrinsifier::Profiler_getCurrentTag(Assembler* assembler,
Label* normal_ir_body) {
__ LoadIsolate(RAX);
__ movq(RAX, Address(RAX, target::Isolate::current_tag_offset()));
__ ret();
}
void AsmIntrinsifier::Timeline_isDartStreamEnabled(Assembler* assembler,
Label* normal_ir_body) {
#if !defined(SUPPORT_TIMELINE)
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
#else
Label true_label;
// Load TimelineStream*.
__ movq(RAX, Address(THR, target::Thread::dart_stream_offset()));
// Load uintptr_t from TimelineStream*.
__ movq(RAX, Address(RAX, target::TimelineStream::enabled_offset()));
__ cmpq(RAX, Immediate(0));
__ j(NOT_ZERO, &true_label, Assembler::kNearJump);
// Not enabled.
__ LoadObject(RAX, CastHandle<Object>(FalseObject()));
__ ret();
// Enabled.
__ Bind(&true_label);
__ LoadObject(RAX, CastHandle<Object>(TrueObject()));
__ ret();
#endif
}
#undef __
} // namespace compiler
} // namespace dart
#endif // defined(TARGET_ARCH_X64)