/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef jit_arm64_MacroAssembler_arm64_h
#define jit_arm64_MacroAssembler_arm64_h
#include "jit/arm64/Assembler-arm64.h"
#include "jit/arm64/vixl/Debugger-vixl.h"
#include "jit/arm64/vixl/MacroAssembler-vixl.h"
#include "jit/AtomicOp.h"
#include "jit/MoveResolver.h"
#include "vm/BigIntType.h" // JS::BigInt
#include "wasm/WasmBuiltins.h"
#ifdef _M_ARM64
# ifdef move32
# undef move32
# endif
# ifdef move64
# undef move64
# endif
#endif
namespace js {
namespace jit {
// Import VIXL operands directly into the jit namespace for shared code.
using vixl::MemOperand;
using vixl::Operand;
struct ImmShiftedTag :
public ImmWord {
explicit ImmShiftedTag(JSValueType type)
: ImmWord(uintptr_t(JSValueShiftedTag(JSVAL_TYPE_TO_SHIFTED_TAG(type)))) {
}
};
struct ImmTag :
public Imm32 {
explicit ImmTag(JSValueTag tag) : Imm32(tag) {}
};
class ScratchTagScope;
class MacroAssemblerCompat :
public vixl::MacroAssembler {
public:
using Condition = vixl::Condition;
private:
// Perform a downcast. Should be removed by Bug 996602.
js::jit::MacroAssembler& asMasm();
const js::jit::MacroAssembler& asMasm()
const;
public:
// Restrict to only VIXL-internal functions.
vixl::MacroAssembler& asVIXL();
const MacroAssembler& asVIXL()
const;
protected:
bool enoughMemory_;
MacroAssemblerCompat() : vixl::MacroAssembler(), enoughMemory_(
true) {}
protected:
MoveResolver moveResolver_;
public:
bool oom()
const {
return Assembler::oom() || !enoughMemory_; }
static ARMRegister toARMRegister(RegisterOrSP r, size_t size) {
if (IsHiddenSP(r)) {
MOZ_ASSERT(size == 64);
return sp;
}
return ARMRegister(AsRegister(r), size);
}
static MemOperand toMemOperand(
const Address& a) {
return MemOperand(toARMRegister(a.base, 64), a.offset);
}
FaultingCodeOffset doBaseIndex(
const vixl::CPURegister& rt,
const BaseIndex& addr, vixl::LoadStoreOp op) {
const ARMRegister base = toARMRegister(addr.base, 64);
const ARMRegister index = ARMRegister(addr.index, 64);
const unsigned scale = addr.scale;
if (!addr.offset &&
(!scale || scale ==
static_cast<
unsigned>(CalcLSDataSize(op)))) {
return LoadStoreMacro(rt, MemOperand(base, index, vixl::LSL, scale), op);
}
vixl::UseScratchRegisterScope temps(
this);
ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(!scratch64.Is(rt));
MOZ_ASSERT(!scratch64.Is(base));
MOZ_ASSERT(!scratch64.Is(index));
Add(scratch64, base, Operand(index, vixl::LSL, scale));
return LoadStoreMacro(rt, MemOperand(scratch64, addr.offset), op);
}
void push(FloatRegister f) {
vixl::MacroAssembler::Push(ARMFPRegister(f, 64));
}
void push(ARMFPRegister f) { vixl::MacroAssembler::Push(f); }
void push(Imm32 imm) {
if (imm.value == 0) {
vixl::MacroAssembler::Push(vixl::xzr);
}
else {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
move32(imm, scratch64.asUnsized());
vixl::MacroAssembler::Push(scratch64);
}
}
void push(ImmWord imm) {
if (imm.value == 0) {
vixl::MacroAssembler::Push(vixl::xzr);
}
else {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
Mov(scratch64, imm.value);
vixl::MacroAssembler::Push(scratch64);
}
}
void push(ImmPtr imm) {
if (imm.value == nullptr) {
vixl::MacroAssembler::Push(vixl::xzr);
}
else {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
movePtr(imm, scratch64.asUnsized());
vixl::MacroAssembler::Push(scratch64);
}
}
void push(ImmGCPtr imm) {
if (imm.value == nullptr) {
vixl::MacroAssembler::Push(vixl::xzr);
}
else {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
movePtr(imm, scratch64.asUnsized());
vixl::MacroAssembler::Push(scratch64);
}
}
void push(ARMRegister reg) { vixl::MacroAssembler::Push(reg); }
void push(Address a) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(a.base != scratch64.asUnsized());
loadPtr(a, scratch64.asUnsized());
vixl::MacroAssembler::Push(scratch64);
}
// Push registers.
void push(
Register reg) { vixl::MacroAssembler::Push(ARMRegister(reg, 64)); }
void push(RegisterOrSP reg) {
if (IsHiddenSP(reg)) {
vixl::MacroAssembler::Push(sp);
}
vixl::MacroAssembler::Push(toARMRegister(reg, 64));
}
void push(
Register r0,
Register r1) {
vixl::MacroAssembler::Push(ARMRegister(r0, 64), ARMRegister(r1, 64));
}
void push(
Register r0,
Register r1,
Register r2) {
vixl::MacroAssembler::Push(ARMRegister(r0, 64), ARMRegister(r1, 64),
ARMRegister(r2, 64));
}
void push(
Register r0,
Register r1,
Register r2,
Register r3) {
vixl::MacroAssembler::Push(ARMRegister(r0, 64), ARMRegister(r1, 64),
ARMRegister(r2, 64), ARMRegister(r3, 64));
}
void push(
Register r0, ARMRegister r1) {
vixl::MacroAssembler::Push(ARMRegister(r0, 64), r1);
}
void push(ARMFPRegister r0, ARMFPRegister r1, ARMFPRegister r2,
ARMFPRegister r3) {
vixl::MacroAssembler::Push(r0, r1, r2, r3);
}
// Pop registers.
void pop(
Register reg) { vixl::MacroAssembler::Pop(ARMRegister(reg, 64)); }
void pop(
Register r0,
Register r1) {
vixl::MacroAssembler::Pop(ARMRegister(r0, 64), ARMRegister(r1, 64));
}
void pop(
Register r0,
Register r1,
Register r2) {
vixl::MacroAssembler::Pop(ARMRegister(r0, 64), ARMRegister(r1, 64),
ARMRegister(r2, 64));
}
void pop(
Register r0,
Register r1,
Register r2,
Register r3) {
vixl::MacroAssembler::Pop(ARMRegister(r0, 64), ARMRegister(r1, 64),
ARMRegister(r2, 64), ARMRegister(r3, 64));
}
void pop(ARMFPRegister r0, ARMFPRegister r1, ARMFPRegister r2,
ARMFPRegister r3) {
vixl::MacroAssembler::Pop(r0, r1, r2, r3);
}
void pop(ARMRegister r0,
Register r1) {
vixl::MacroAssembler::Pop(r0, ARMRegister(r1, 64));
}
void pop(
const ValueOperand& v) { pop(v.valueReg()); }
void pop(
const FloatRegister& f) {
vixl::MacroAssembler::Pop(ARMFPRegister(f, 64));
}
// Update sp with the value of the current active stack pointer, if necessary.
void syncStackPtr() {
if (!GetStackPointer64().Is(vixl::sp)) {
Mov(vixl::sp, GetStackPointer64());
}
}
void initPseudoStackPtr() {
if (!GetStackPointer64().Is(vixl::sp)) {
Mov(GetStackPointer64(), vixl::sp);
}
}
// In debug builds only, cause a trap if PSP is active and PSP != SP
void assertStackPtrsSynced(uint32_t id) {
#ifdef DEBUG
// The add and sub instructions below will only take a 12-bit immediate.
MOZ_ASSERT(id <= 0xFFF);
if (!GetStackPointer64().Is(vixl::sp)) {
Label ok;
// Add a marker, so we can figure out who requested the check when
// inspecting the generated code. Note, a more concise way to encode
// the marker would be to use it as an immediate for the `brk`
// instruction as generated by `Unreachable()`, and removing the add/sub.
Add(GetStackPointer64(), GetStackPointer64(), Operand(id));
Sub(GetStackPointer64(), GetStackPointer64(), Operand(id));
Cmp(vixl::sp, GetStackPointer64());
B(Equal, &ok);
Unreachable();
bind(&ok);
}
#endif
}
// In debug builds only, add a marker that doesn't change the machine's
// state. Note these markers are x16-based, as opposed to the x28-based
// ones made by `assertStackPtrsSynced`.
void addMarker(uint32_t id) {
#ifdef DEBUG
// Only 12 bits of immediate are allowed.
MOZ_ASSERT(id <= 0xFFF);
ARMRegister x16 = ARMRegister(r16, 64);
Add(x16, x16, Operand(id));
Sub(x16, x16, Operand(id));
#endif
}
void storeValue(ValueOperand val,
const Address& dest) {
storePtr(val.valueReg(), dest);
}
template <
typename T>
void storeValue(JSValueType type,
Register reg,
const T& dest) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != reg);
tagValue(type, reg, ValueOperand(scratch));
storeValue(ValueOperand(scratch), dest);
}
template <
typename T>
void storeValue(
const Value& val,
const T& dest) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
moveValue(val, ValueOperand(scratch));
storeValue(ValueOperand(scratch), dest);
}
void storeValue(ValueOperand val, BaseIndex dest) {
storePtr(val.valueReg(), dest);
}
void storeValue(
const Address& src,
const Address& dest,
Register temp) {
loadPtr(src, temp);
storePtr(temp, dest);
}
void storePrivateValue(
Register src,
const Address& dest) {
storePtr(src, dest);
}
void storePrivateValue(ImmGCPtr imm,
const Address& dest) {
storePtr(imm, dest);
}
void loadValue(Address src,
Register val) {
Ldr(ARMRegister(val, 64), MemOperand(src));
}
void loadValue(Address src, ValueOperand val) {
Ldr(ARMRegister(val.valueReg(), 64), MemOperand(src));
}
void loadValue(
const BaseIndex& src, ValueOperand val) {
doBaseIndex(ARMRegister(val.valueReg(), 64), src, vixl::LDR_x);
}
void loadUnalignedValue(
const Address& src, ValueOperand dest) {
loadValue(src, dest);
}
void tagValue(JSValueType type,
Register payload, ValueOperand dest) {
// This could be cleverer, but the first attempt had bugs.
Orr(ARMRegister(dest.valueReg(), 64), ARMRegister(payload, 64),
Operand(ImmShiftedTag(type).value));
}
void pushValue(ValueOperand val) {
vixl::MacroAssembler::Push(ARMRegister(val.valueReg(), 64));
}
void popValue(ValueOperand val) {
vixl::MacroAssembler::Pop(ARMRegister(val.valueReg(), 64));
// SP may be < PSP now (that's OK).
// eg testcase: tests/backup-point-bug1315634.js
}
void pushValue(
const Value& val) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
if (val.isGCThing()) {
BufferOffset load =
movePatchablePtr(ImmPtr(val.bitsAsPunboxPointer()), scratch);
writeDataRelocation(val, load);
push(scratch);
}
else {
moveValue(val, scratch);
push(scratch);
}
}
void pushValue(JSValueType type,
Register reg) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != reg);
tagValue(type, reg, ValueOperand(scratch));
push(scratch);
}
void pushValue(
const Address& addr) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != addr.base);
loadValue(addr, scratch);
push(scratch);
}
void pushValue(
const BaseIndex& addr,
Register scratch) {
loadValue(addr, ValueOperand(scratch));
pushValue(ValueOperand(scratch));
}
template <
typename T>
void storeUnboxedPayload(ValueOperand value, T address, size_t nbytes,
JSValueType type) {
switch (nbytes) {
case 8: {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
if (type == JSVAL_TYPE_OBJECT) {
unboxObjectOrNull(value, scratch);
}
else {
unboxNonDouble(value, scratch, type);
}
storePtr(scratch, address);
return;
}
case 4:
store32(value.valueReg(), address);
return;
case 1:
store8(value.valueReg(), address);
return;
default:
MOZ_CRASH(
"Bad payload width");
}
}
void moveValue(
const Value& val,
Register dest) {
if (val.isGCThing()) {
BufferOffset load =
movePatchablePtr(ImmPtr(val.bitsAsPunboxPointer()), dest);
writeDataRelocation(val, load);
}
else {
movePtr(ImmWord(val.asRawBits()), dest);
}
}
void moveValue(
const Value& src,
const ValueOperand& dest) {
moveValue(src, dest.valueReg());
}
CodeOffset pushWithPatch(ImmWord imm) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
CodeOffset label = movWithPatch(imm, scratch);
push(scratch);
return label;
}
CodeOffset movWithPatch(ImmWord imm,
Register dest) {
BufferOffset off = immPool64(ARMRegister(dest, 64), imm.value);
return CodeOffset(off.getOffset());
}
CodeOffset movWithPatch(ImmPtr imm,
Register dest) {
BufferOffset off = immPool64(ARMRegister(dest, 64), uint64_t(imm.value));
return CodeOffset(off.getOffset());
}
void boxValue(JSValueType type,
Register src,
Register dest);
void splitSignExtTag(
Register src,
Register dest) {
sbfx(ARMRegister(dest, 64), ARMRegister(src, 64), JSVAL_TAG_SHIFT,
(64 - JSVAL_TAG_SHIFT));
}
[[nodiscard]]
Register extractTag(
const Address& address,
Register scratch) {
loadPtr(address, scratch);
splitSignExtTag(scratch, scratch);
return scratch;
}
[[nodiscard]]
Register extractTag(
const ValueOperand& value,
Register scratch) {
splitSignExtTag(value.valueReg(), scratch);
return scratch;
}
[[nodiscard]]
Register extractObject(
const Address& address,
Register scratch) {
loadPtr(address, scratch);
unboxObject(scratch, scratch);
return scratch;
}
[[nodiscard]]
Register extractObject(
const ValueOperand& value,
Register scratch) {
unboxObject(value, scratch);
return scratch;
}
[[nodiscard]]
Register extractSymbol(
const ValueOperand& value,
Register scratch) {
unboxSymbol(value, scratch);
return scratch;
}
[[nodiscard]]
Register extractInt32(
const ValueOperand& value,
Register scratch) {
unboxInt32(value, scratch);
return scratch;
}
[[nodiscard]]
Register extractBoolean(
const ValueOperand& value,
Register scratch) {
unboxBoolean(value, scratch);
return scratch;
}
void emitSet(Condition cond,
Register dest) {
Cset(ARMRegister(dest, 64), cond);
}
void testNullSet(Condition cond,
const ValueOperand& value,
Register dest) {
cond = testNull(cond, value);
emitSet(cond, dest);
}
void testObjectSet(Condition cond,
const ValueOperand& value,
Register dest) {
cond = testObject(cond, value);
emitSet(cond, dest);
}
void testUndefinedSet(Condition cond,
const ValueOperand& value,
Register dest) {
cond = testUndefined(cond, value);
emitSet(cond, dest);
}
void convertBoolToInt32(
Register source,
Register dest) {
Uxtb(ARMRegister(dest, 64), ARMRegister(source, 64));
}
void convertInt32ToDouble(
Register src, FloatRegister dest) {
Scvtf(ARMFPRegister(dest, 64),
ARMRegister(src, 32));
// Uses FPCR rounding mode.
}
void convertInt32ToDouble(
const Address& src, FloatRegister dest) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != src.base);
load32(src, scratch);
convertInt32ToDouble(scratch, dest);
}
void convertInt32ToDouble(
const BaseIndex& src, FloatRegister dest) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != src.base);
MOZ_ASSERT(scratch != src.index);
load32(src, scratch);
convertInt32ToDouble(scratch, dest);
}
void convertInt32ToFloat32(
Register src, FloatRegister dest) {
Scvtf(ARMFPRegister(dest, 32),
ARMRegister(src, 32));
// Uses FPCR rounding mode.
}
void convertInt32ToFloat32(
const Address& src, FloatRegister dest) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != src.base);
load32(src, scratch);
convertInt32ToFloat32(scratch, dest);
}
void convertUInt32ToDouble(
Register src, FloatRegister dest) {
Ucvtf(ARMFPRegister(dest, 64),
ARMRegister(src, 32));
// Uses FPCR rounding mode.
}
void convertUInt32ToDouble(
const Address& src, FloatRegister dest) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != src.base);
load32(src, scratch);
convertUInt32ToDouble(scratch, dest);
}
void convertUInt32ToFloat32(
Register src, FloatRegister dest) {
Ucvtf(ARMFPRegister(dest, 32),
ARMRegister(src, 32));
// Uses FPCR rounding mode.
}
void convertUInt32ToFloat32(
const Address& src, FloatRegister dest) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != src.base);
load32(src, scratch);
convertUInt32ToFloat32(scratch, dest);
}
void convertFloat32ToDouble(FloatRegister src, FloatRegister dest) {
Fcvt(ARMFPRegister(dest, 64), ARMFPRegister(src, 32));
}
void convertDoubleToFloat32(FloatRegister src, FloatRegister dest) {
Fcvt(ARMFPRegister(dest, 32), ARMFPRegister(src, 64));
}
void convertDoubleToFloat16(FloatRegister src, FloatRegister dest) {
Fcvt(ARMFPRegister(dest, 16), ARMFPRegister(src, 64));
}
void convertFloat16ToDouble(FloatRegister src, FloatRegister dest) {
Fcvt(ARMFPRegister(dest, 64), ARMFPRegister(src, 16));
}
void convertFloat32ToFloat16(FloatRegister src, FloatRegister dest) {
Fcvt(ARMFPRegister(dest, 16), ARMFPRegister(src, 32));
}
void convertFloat16ToFloat32(FloatRegister src, FloatRegister dest) {
Fcvt(ARMFPRegister(dest, 32), ARMFPRegister(src, 16));
}
void convertInt32ToFloat16(
Register src, FloatRegister dest) {
// Direct "32-bit to half-precision" move requires (FEAT_FP16), so we
// instead use a "32-bit to single-precision" move.
convertInt32ToFloat32(src, dest);
convertFloat32ToFloat16(dest, dest);
}
using vixl::MacroAssembler::B;
bool hasFjcvtzs()
const {
return CPUHas(vixl::CPUFeatures::kFP, vixl::CPUFeatures::kJSCVT);
}
void convertDoubleToInt32(FloatRegister src,
Register dest, Label* fail,
bool negativeZeroCheck =
true) {
ARMFPRegister fsrc64(src, 64);
ARMRegister dest32(dest, 32);
// ARMv8.3 chips support the FJCVTZS instruction, which handles exactly this
// logic.
if (hasFjcvtzs()) {
// Convert double to integer, rounding toward zero.
// The Z-flag is set iff the conversion is exact. -0 unsets the Z-flag.
Fjcvtzs(dest32, fsrc64);
if (negativeZeroCheck) {
B(fail, Assembler::NonZero);
}
else {
Label done;
B(&done, Assembler::Zero);
// If conversion was exact, go to end.
// The conversion was inexact, but the caller intends to allow -0.
// Compare fsrc64 to 0.
// If fsrc64 == 0 and FJCVTZS conversion was inexact, then fsrc64 is -0.
Fcmp(fsrc64, 0.0);
B(fail, Assembler::NotEqual);
// Pass through -0; fail otherwise.
bind(&done);
}
}
else {
// Older processors use a significantly slower path.
ARMRegister dest64(dest, 64);
vixl::UseScratchRegisterScope temps(
this);
const ARMFPRegister scratch64 = temps.AcquireD();
MOZ_ASSERT(!scratch64.Is(fsrc64));
Fcvtzs(dest32, fsrc64);
// Convert, rounding toward zero.
Scvtf(scratch64, dest32);
// Convert back, using FPCR rounding mode.
Fcmp(scratch64, fsrc64);
B(fail, Assembler::NotEqual);
if (negativeZeroCheck) {
Label nonzero;
Cbnz(dest32, &nonzero);
// dest32 is 0, fail if fsrc64 is negative.
Fmov(dest64, fsrc64);
Cmp(dest64, xzr);
B(fail, Assembler::
Signed);
Mov(dest64, xzr);
bind(&nonzero);
}
}
}
void convertFloat32ToInt32(FloatRegister src,
Register dest, Label* fail,
bool negativeZeroCheck =
true) {
vixl::UseScratchRegisterScope temps(
this);
const ARMFPRegister scratch32 = temps.AcquireS();
ARMFPRegister fsrc(src, 32);
ARMRegister dest32(dest, 32);
ARMRegister dest64(dest, 64);
MOZ_ASSERT(!scratch32.Is(fsrc));
Fcvtzs(dest64, fsrc);
// Convert, rounding toward zero.
Scvtf(scratch32, dest32);
// Convert back, using FPCR rounding mode.
Fcmp(scratch32, fsrc);
B(fail, Assembler::NotEqual);
if (negativeZeroCheck) {
Label nonzero;
Cbnz(dest32, &nonzero);
// dest32 is 0, fail if fsrc64 is negative.
Fmov(dest32, fsrc);
Cmp(dest32, xzr);
B(fail, Assembler::
Signed);
Mov(dest32, xzr);
bind(&nonzero);
}
Uxtw(dest64, dest64);
}
void convertDoubleToPtr(FloatRegister src,
Register dest, Label* fail,
bool negativeZeroCheck =
true) {
ARMFPRegister fsrc64(src, 64);
ARMRegister dest64(dest, 64);
vixl::UseScratchRegisterScope temps(
this);
const ARMFPRegister scratch64 = temps.AcquireD();
MOZ_ASSERT(!scratch64.Is(fsrc64));
// Note: we can't use the FJCVTZS instruction here because that only works
// for 32-bit values.
Fcvtzs(dest64, fsrc64);
// Convert, rounding toward zero.
Scvtf(scratch64, dest64);
// Convert back, using FPCR rounding mode.
Fcmp(scratch64, fsrc64);
B(fail, Assembler::NotEqual);
if (negativeZeroCheck) {
Label nonzero;
Cbnz(dest64, &nonzero);
// dest64 is 0, fail if fsrc64 is negative.
Fmov(dest64, fsrc64);
Cmp(dest64, xzr);
B(fail, Assembler::
Signed);
Mov(dest64, xzr);
bind(&nonzero);
}
}
void truncateFloat32ModUint32(FloatRegister src,
Register dest) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
ARMFPRegister src32(src, 32);
ARMRegister dest64(dest, 64);
MOZ_ASSERT(!scratch64.Is(dest64));
// Convert scalar to signed 64-bit fixed-point, rounding toward zero.
// In the case of overflow, the output is saturated.
// In the case of NaN and -0, the output is zero.
Fcvtzs(dest64, src32);
// Zero if the result is saturated, i.e. it's either INT64_MIN or INT64_MAX.
Add(scratch64, dest64, Operand(0x7fff
'ffff'ffff
'ffff));
Cmn(scratch64, 3);
Csel(dest64, dest64, vixl::xzr, Assembler::BelowOrEqual);
// Clear upper 32 bits.
Uxtw(dest64, dest64);
}
void jump(Label* label) { B(label); }
void jump(JitCode* code) { branch(code); }
void jump(ImmPtr ptr) {
// It is unclear why this sync is necessary:
// * PSP and SP have been observed to be different in testcase
// tests/asm.js/testBug1046688.js.
// * Removing the sync causes no failures in all of jit-tests.
//
// Also see branch(JitCode*) below. This version of jump() is called only
// from jump(TrampolinePtr) which is called on various very slow paths,
// probably only in JS.
syncStackPtr();
BufferOffset loc =
b(-1,
LabelDoc());
// The jump target will be patched by executableCopy().
addPendingJump(loc, ptr, RelocationKind::HARDCODED);
}
void jump(TrampolinePtr code) { jump(ImmPtr(code.value)); }
void jump(
Register reg) { Br(ARMRegister(reg, 64)); }
void jump(
const Address& addr) {
vixl::UseScratchRegisterScope temps(
this);
MOZ_ASSERT(temps.IsAvailable(ScratchReg64));
// ip0
temps.Exclude(ScratchReg64);
MOZ_ASSERT(addr.base != ScratchReg64.asUnsized());
loadPtr(addr, ScratchReg64.asUnsized());
br(ScratchReg64);
}
void align(
int alignment) { armbuffer_.align(alignment); }
void haltingAlign(
int alignment) {
armbuffer_.align(alignment, vixl::HLT | ImmException(0xBAAD));
}
void nopAlign(
int alignment) { armbuffer_.align(alignment); }
void movePtr(
Register src,
Register dest) {
Mov(ARMRegister(dest, 64), ARMRegister(src, 64));
}
void movePtr(ImmWord imm,
Register dest) {
Mov(ARMRegister(dest, 64), int64_t(imm.value));
}
void movePtr(ImmPtr imm,
Register dest) {
Mov(ARMRegister(dest, 64), int64_t(imm.value));
}
void movePtr(wasm::SymbolicAddress imm,
Register dest) {
BufferOffset off = movePatchablePtr(ImmWord(0xffffffffffffffffULL), dest);
append(wasm::SymbolicAccess(CodeOffset(off.getOffset()), imm));
}
void movePtr(ImmGCPtr imm,
Register dest) {
BufferOffset load = movePatchablePtr(ImmPtr(imm.value), dest);
writeDataRelocation(imm, load);
}
void mov(ImmWord imm,
Register dest) { movePtr(imm, dest); }
void mov(ImmPtr imm,
Register dest) { movePtr(imm, dest); }
void mov(wasm::SymbolicAddress imm,
Register dest) { movePtr(imm, dest); }
void mov(
Register src,
Register dest) { movePtr(src, dest); }
void mov(CodeLabel* label,
Register dest);
void move32(Imm32 imm,
Register dest) {
Mov(ARMRegister(dest, 32), (int64_t)imm.value);
}
void move32(
Register src,
Register dest) {
Mov(ARMRegister(dest, 32), ARMRegister(src, 32));
}
// Move a pointer using a literal pool, so that the pointer
// may be easily patched or traced.
// Returns the BufferOffset of the load instruction emitted.
BufferOffset movePatchablePtr(ImmWord ptr,
Register dest);
BufferOffset movePatchablePtr(ImmPtr ptr,
Register dest);
void loadPtr(wasm::SymbolicAddress address,
Register dest) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch = temps.AcquireX();
movePtr(address, scratch.asUnsized());
Ldr(ARMRegister(dest, 64), MemOperand(scratch));
}
void loadPtr(AbsoluteAddress address,
Register dest) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch = temps.AcquireX();
movePtr(ImmWord((uintptr_t)address.addr), scratch.asUnsized());
Ldr(ARMRegister(dest, 64), MemOperand(scratch));
}
FaultingCodeOffset loadPtr(
const Address& address,
Register dest) {
return Ldr(ARMRegister(dest, 64), MemOperand(address));
}
FaultingCodeOffset loadPtr(
const BaseIndex& src,
Register dest) {
ARMRegister base = toARMRegister(src.base, 64);
uint32_t scale = Imm32::ShiftOf(src.scale).value;
ARMRegister dest64(dest, 64);
ARMRegister index64(src.index, 64);
if (src.offset) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch = temps.AcquireX();
MOZ_ASSERT(!scratch.Is(base));
MOZ_ASSERT(!scratch.Is(dest64));
MOZ_ASSERT(!scratch.Is(index64));
Add(scratch, base, Operand(int64_t(src.offset)));
return Ldr(dest64, MemOperand(scratch, index64, vixl::LSL, scale));
}
return Ldr(dest64, MemOperand(base, index64, vixl::LSL, scale));
}
void loadPrivate(
const Address& src,
Register dest);
FaultingCodeOffset store8(
Register src,
const Address& address) {
return Strb(ARMRegister(src, 32), toMemOperand(address));
}
void store8(Imm32 imm,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != address.base);
move32(imm, scratch32.asUnsized());
Strb(scratch32, toMemOperand(address));
}
FaultingCodeOffset store8(
Register src,
const BaseIndex& address) {
return doBaseIndex(ARMRegister(src, 32), address, vixl::STRB_w);
}
void store8(Imm32 imm,
const BaseIndex& address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != address.base);
MOZ_ASSERT(scratch32.asUnsized() != address.index);
Mov(scratch32, Operand(imm.value));
doBaseIndex(scratch32, address, vixl::STRB_w);
}
FaultingCodeOffset store16(
Register src,
const Address& address) {
return Strh(ARMRegister(src, 32), toMemOperand(address));
}
void store16(Imm32 imm,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != address.base);
move32(imm, scratch32.asUnsized());
Strh(scratch32, toMemOperand(address));
}
FaultingCodeOffset store16(
Register src,
const BaseIndex& address) {
return doBaseIndex(ARMRegister(src, 32), address, vixl::STRH_w);
}
void store16(Imm32 imm,
const BaseIndex& address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != address.base);
MOZ_ASSERT(scratch32.asUnsized() != address.index);
Mov(scratch32, Operand(imm.value));
doBaseIndex(scratch32, address, vixl::STRH_w);
}
template <
typename S,
typename T>
void store16Unaligned(
const S& src,
const T& dest) {
store16(src, dest);
}
void storePtr(ImmWord imm,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != address.base);
movePtr(imm, scratch);
storePtr(scratch, address);
}
void storePtr(ImmPtr imm,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(scratch64.asUnsized() != address.base);
Mov(scratch64, uint64_t(imm.value));
Str(scratch64, toMemOperand(address));
}
void storePtr(ImmGCPtr imm,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != address.base);
movePtr(imm, scratch);
storePtr(scratch, address);
}
FaultingCodeOffset storePtr(
Register src,
const Address& address) {
return Str(ARMRegister(src, 64), toMemOperand(address));
}
void storePtr(ImmWord imm,
const BaseIndex& address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(scratch64.asUnsized() != address.base);
MOZ_ASSERT(scratch64.asUnsized() != address.index);
Mov(scratch64, Operand(imm.value));
doBaseIndex(scratch64, address, vixl::STR_x);
}
void storePtr(ImmGCPtr imm,
const BaseIndex& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != address.base);
MOZ_ASSERT(scratch != address.index);
movePtr(imm, scratch);
doBaseIndex(ARMRegister(scratch, 64), address, vixl::STR_x);
}
FaultingCodeOffset storePtr(
Register src,
const BaseIndex& address) {
return doBaseIndex(ARMRegister(src, 64), address, vixl::STR_x);
}
void storePtr(
Register src, AbsoluteAddress address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
Mov(scratch64, uint64_t(address.addr));
Str(ARMRegister(src, 64), MemOperand(scratch64));
}
void store32(
Register src, AbsoluteAddress address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
Mov(scratch64, uint64_t(address.addr));
Str(ARMRegister(src, 32), MemOperand(scratch64));
}
void store32(Imm32 imm,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != address.base);
Mov(scratch32, uint64_t(imm.value));
Str(scratch32, toMemOperand(address));
}
FaultingCodeOffset store32(
Register r,
const Address& address) {
return Str(ARMRegister(r, 32), toMemOperand(address));
}
void store32(Imm32 imm,
const BaseIndex& address) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != address.base);
MOZ_ASSERT(scratch32.asUnsized() != address.index);
Mov(scratch32, imm.value);
doBaseIndex(scratch32, address, vixl::STR_w);
}
FaultingCodeOffset store32(
Register r,
const BaseIndex& address) {
return doBaseIndex(ARMRegister(r, 32), address, vixl::STR_w);
}
template <
typename S,
typename T>
void store32Unaligned(
const S& src,
const T& dest) {
store32(src, dest);
}
FaultingCodeOffset store64(Register64 src, Address address) {
return storePtr(src.reg, address);
}
FaultingCodeOffset store64(Register64 src,
const BaseIndex& address) {
return storePtr(src.reg, address);
}
void store64(Imm64 imm,
const BaseIndex& address) {
storePtr(ImmWord(imm.value), address);
}
void store64(Imm64 imm,
const Address& address) {
storePtr(ImmWord(imm.value), address);
}
template <
typename S,
typename T>
void store64Unaligned(
const S& src,
const T& dest) {
store64(src, dest);
}
// StackPointer manipulation.
inline void addToStackPtr(
Register src);
inline void addToStackPtr(Imm32 imm);
inline void addToStackPtr(
const Address& src);
inline void addStackPtrTo(
Register dest);
inline void subFromStackPtr(
Register src);
inline void subFromStackPtr(Imm32 imm);
inline void subStackPtrFrom(
Register dest);
inline void andToStackPtr(Imm32 t);
inline void moveToStackPtr(
Register src);
inline void moveStackPtrTo(
Register dest);
inline void loadStackPtr(
const Address& src);
inline void storeStackPtr(
const Address& dest);
// StackPointer testing functions.
inline void branchTestStackPtr(Condition cond, Imm32 rhs, Label* label);
inline void branchStackPtr(Condition cond,
Register rhs, Label* label);
inline void branchStackPtrRhs(Condition cond, Address lhs, Label* label);
inline void branchStackPtrRhs(Condition cond, AbsoluteAddress lhs,
Label* label);
void testPtr(
Register lhs,
Register rhs) {
Tst(ARMRegister(lhs, 64), Operand(ARMRegister(rhs, 64)));
}
void test32(
Register lhs,
Register rhs) {
Tst(ARMRegister(lhs, 32), Operand(ARMRegister(rhs, 32)));
}
void test32(
const Address& addr, Imm32 imm) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != addr.base);
load32(addr, scratch32.asUnsized());
Tst(scratch32, Operand(imm.value));
}
void test32(
Register lhs, Imm32 rhs) {
Tst(ARMRegister(lhs, 32), Operand(rhs.value));
}
void cmp32(
Register lhs, Imm32 rhs) {
Cmp(ARMRegister(lhs, 32), Operand(rhs.value));
}
void cmp32(
Register a,
Register b) {
Cmp(ARMRegister(a, 32), Operand(ARMRegister(b, 32)));
}
void cmp32(
const Address& lhs, Imm32 rhs) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != lhs.base);
Ldr(scratch32, toMemOperand(lhs));
Cmp(scratch32, Operand(rhs.value));
}
void cmp32(
const Address& lhs,
Register rhs) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != lhs.base);
MOZ_ASSERT(scratch32.asUnsized() != rhs);
Ldr(scratch32, toMemOperand(lhs));
Cmp(scratch32, Operand(ARMRegister(rhs, 32)));
}
void cmp32(
const vixl::Operand& lhs, Imm32 rhs) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
Mov(scratch32, lhs);
Cmp(scratch32, Operand(rhs.value));
}
void cmp32(
const vixl::Operand& lhs,
Register rhs) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
Mov(scratch32, lhs);
Cmp(scratch32, Operand(ARMRegister(rhs, 32)));
}
void cmn32(
Register lhs, Imm32 rhs) {
Cmn(ARMRegister(lhs, 32), Operand(rhs.value));
}
void cmpPtr(
Register lhs, Imm32 rhs) {
Cmp(ARMRegister(lhs, 64), Operand(rhs.value));
}
void cmpPtr(
Register lhs, ImmWord rhs) {
Cmp(ARMRegister(lhs, 64), Operand(rhs.value));
}
void cmpPtr(
Register lhs, ImmPtr rhs) {
Cmp(ARMRegister(lhs, 64), Operand(uint64_t(rhs.value)));
}
void cmpPtr(
Register lhs, Imm64 rhs) {
Cmp(ARMRegister(lhs, 64), Operand(uint64_t(rhs.value)));
}
void cmpPtr(
Register lhs,
Register rhs) {
Cmp(ARMRegister(lhs, 64), ARMRegister(rhs, 64));
}
void cmpPtr(
Register lhs, ImmGCPtr rhs) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != lhs);
movePtr(rhs, scratch);
cmpPtr(lhs, scratch);
}
void cmpPtr(
const Address& lhs,
Register rhs) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(scratch64.asUnsized() != lhs.base);
MOZ_ASSERT(scratch64.asUnsized() != rhs);
Ldr(scratch64, toMemOperand(lhs));
Cmp(scratch64, Operand(ARMRegister(rhs, 64)));
}
void cmpPtr(
const Address& lhs, ImmWord rhs) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(scratch64.asUnsized() != lhs.base);
Ldr(scratch64, toMemOperand(lhs));
Cmp(scratch64, Operand(rhs.value));
}
void cmpPtr(
const Address& lhs, ImmPtr rhs) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(scratch64.asUnsized() != lhs.base);
Ldr(scratch64, toMemOperand(lhs));
Cmp(scratch64, Operand(uint64_t(rhs.value)));
}
void cmpPtr(
const Address& lhs, ImmGCPtr rhs) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != lhs.base);
loadPtr(lhs, scratch);
cmpPtr(scratch, rhs);
}
FaultingCodeOffset loadDouble(
const Address& src, FloatRegister dest) {
return Ldr(ARMFPRegister(dest, 64), MemOperand(src));
}
FaultingCodeOffset loadDouble(
const BaseIndex& src, FloatRegister dest) {
ARMRegister base = toARMRegister(src.base, 64);
ARMRegister index(src.index, 64);
if (src.offset == 0) {
return Ldr(ARMFPRegister(dest, 64),
MemOperand(base, index, vixl::LSL,
unsigned(src.scale)));
}
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(scratch64.asUnsized() != src.base);
MOZ_ASSERT(scratch64.asUnsized() != src.index);
Add(scratch64, base, Operand(index, vixl::LSL,
unsigned(src.scale)));
return Ldr(ARMFPRegister(dest, 64), MemOperand(scratch64, src.offset));
}
FaultingCodeOffset loadFloat32(
const Address& addr, FloatRegister dest) {
return Ldr(ARMFPRegister(dest, 32), toMemOperand(addr));
}
FaultingCodeOffset loadFloat32(
const BaseIndex& src, FloatRegister dest) {
ARMRegister base = toARMRegister(src.base, 64);
ARMRegister index(src.index, 64);
if (src.offset == 0) {
return Ldr(ARMFPRegister(dest, 32),
MemOperand(base, index, vixl::LSL,
unsigned(src.scale)));
}
else {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(scratch64.asUnsized() != src.base);
MOZ_ASSERT(scratch64.asUnsized() != src.index);
Add(scratch64, base, Operand(index, vixl::LSL,
unsigned(src.scale)));
return Ldr(ARMFPRegister(dest, 32), MemOperand(scratch64, src.offset));
}
}
FaultingCodeOffset loadFloat16(
const Address& addr, FloatRegister dest,
Register) {
return Ldr(ARMFPRegister(dest, 16), toMemOperand(addr));
}
FaultingCodeOffset loadFloat16(
const BaseIndex& src, FloatRegister dest,
Register) {
ARMRegister base = toARMRegister(src.base, 64);
ARMRegister index(src.index, 64);
if (src.offset == 0) {
return Ldr(ARMFPRegister(dest, 16),
MemOperand(base, index, vixl::LSL,
unsigned(src.scale)));
}
else {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
MOZ_ASSERT(scratch64.asUnsized() != src.base);
MOZ_ASSERT(scratch64.asUnsized() != src.index);
Add(scratch64, base, Operand(index, vixl::LSL,
unsigned(src.scale)));
return Ldr(ARMFPRegister(dest, 16), MemOperand(scratch64, src.offset));
}
}
void moveDouble(FloatRegister src, FloatRegister dest) {
fmov(ARMFPRegister(dest, 64), ARMFPRegister(src, 64));
}
void zeroDouble(FloatRegister reg) {
fmov(ARMFPRegister(reg, 64), vixl::xzr);
}
void zeroFloat32(FloatRegister reg) {
fmov(ARMFPRegister(reg, 32), vixl::wzr);
}
void moveFloat32(FloatRegister src, FloatRegister dest) {
fmov(ARMFPRegister(dest, 32), ARMFPRegister(src, 32));
}
void moveSimd128(FloatRegister src, FloatRegister dest) {
fmov(ARMFPRegister(dest, 128), ARMFPRegister(src, 128));
}
void splitSignExtTag(
const ValueOperand& operand,
Register dest) {
splitSignExtTag(operand.valueReg(), dest);
}
void splitSignExtTag(
const Address& operand,
Register dest) {
loadPtr(operand, dest);
splitSignExtTag(dest, dest);
}
void splitSignExtTag(
const BaseIndex& operand,
Register dest) {
loadPtr(operand, dest);
splitSignExtTag(dest, dest);
}
// Extracts the tag of a value and places it in tag
inline void splitTagForTest(
const ValueOperand& value, ScratchTagScope& tag);
void cmpTag(
const ValueOperand& operand, ImmTag tag) { MOZ_CRASH(
"cmpTag"); }
FaultingCodeOffset load32(
const Address& address,
Register dest) {
return Ldr(ARMRegister(dest, 32), toMemOperand(address));
}
FaultingCodeOffset load32(
const BaseIndex& src,
Register dest) {
return doBaseIndex(ARMRegister(dest, 32), src, vixl::LDR_w);
}
void load32(AbsoluteAddress address,
Register dest) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch64 = temps.AcquireX();
movePtr(ImmWord((uintptr_t)address.addr), scratch64.asUnsized());
ldr(ARMRegister(dest, 32), MemOperand(scratch64));
}
template <
typename S>
void load32Unaligned(
const S& src,
Register dest) {
load32(src, dest);
}
FaultingCodeOffset load64(
const Address& address, Register64 dest) {
return loadPtr(address, dest.reg);
}
FaultingCodeOffset load64(
const BaseIndex& address, Register64 dest) {
return loadPtr(address, dest.reg);
}
template <
typename S>
void load64Unaligned(
const S& src, Register64 dest) {
load64(src, dest);
}
FaultingCodeOffset load8SignExtend(
const Address& address,
Register dest) {
return Ldrsb(ARMRegister(dest, 32), toMemOperand(address));
}
FaultingCodeOffset load8SignExtend(
const BaseIndex& src,
Register dest) {
return doBaseIndex(ARMRegister(dest, 32), src, vixl::LDRSB_w);
}
FaultingCodeOffset load8ZeroExtend(
const Address& address,
Register dest) {
return Ldrb(ARMRegister(dest, 32), toMemOperand(address));
}
FaultingCodeOffset load8ZeroExtend(
const BaseIndex& src,
Register dest) {
return doBaseIndex(ARMRegister(dest, 32), src, vixl::LDRB_w);
}
FaultingCodeOffset load16SignExtend(
const Address& address,
Register dest) {
return Ldrsh(ARMRegister(dest, 32), toMemOperand(address));
}
FaultingCodeOffset load16SignExtend(
const BaseIndex& src,
Register dest) {
return doBaseIndex(ARMRegister(dest, 32), src, vixl::LDRSH_w);
}
template <
typename S>
void load16UnalignedSignExtend(
const S& src,
Register dest) {
load16SignExtend(src, dest);
}
FaultingCodeOffset load16ZeroExtend(
const Address& address,
Register dest) {
return Ldrh(ARMRegister(dest, 32), toMemOperand(address));
}
FaultingCodeOffset load16ZeroExtend(
const BaseIndex& src,
Register dest) {
return doBaseIndex(ARMRegister(dest, 32), src, vixl::LDRH_w);
}
template <
typename S>
void load16UnalignedZeroExtend(
const S& src,
Register dest) {
load16ZeroExtend(src, dest);
}
void adds32(
Register src,
Register dest) {
Adds(ARMRegister(dest, 32), ARMRegister(dest, 32),
Operand(ARMRegister(src, 32)));
}
void adds32(Imm32 imm,
Register dest) {
Adds(ARMRegister(dest, 32), ARMRegister(dest, 32), Operand(imm.value));
}
void adds32(Imm32 imm,
const Address& dest) {
vixl::UseScratchRegisterScope temps(
this);
const ARMRegister scratch32 = temps.AcquireW();
MOZ_ASSERT(scratch32.asUnsized() != dest.base);
Ldr(scratch32, toMemOperand(dest));
Adds(scratch32, scratch32, Operand(imm.value));
Str(scratch32, toMemOperand(dest));
}
void adds64(Imm32 imm,
Register dest) {
Adds(ARMRegister(dest, 64), ARMRegister(dest, 64), Operand(imm.value));
}
void adds64(ImmWord imm,
Register dest) {
Adds(ARMRegister(dest, 64), ARMRegister(dest, 64), Operand(imm.value));
}
void adds64(
Register src,
Register dest) {
Adds(ARMRegister(dest, 64), ARMRegister(dest, 64),
Operand(ARMRegister(src, 64)));
}
void subs32(Imm32 imm,
Register dest) {
Subs(ARMRegister(dest, 32), ARMRegister(dest, 32), Operand(imm.value));
}
void subs32(
Register src,
Register dest) {
Subs(ARMRegister(dest, 32), ARMRegister(dest, 32),
Operand(ARMRegister(src, 32)));
}
void subs64(Imm32 imm,
Register dest) {
Subs(ARMRegister(dest, 64), ARMRegister(dest, 64), Operand(imm.value));
}
void subs64(
Register src,
Register dest) {
Subs(ARMRegister(dest, 64), ARMRegister(dest, 64),
Operand(ARMRegister(src, 64)));
}
void negs32(
Register reg) {
Negs(ARMRegister(reg, 32), Operand(ARMRegister(reg, 32)));
}
void negs64(
Register reg) {
Negs(ARMRegister(reg, 64), Operand(ARMRegister(reg, 64)));
}
void ret() {
pop(lr);
abiret();
}
void retn(Imm32 n) {
vixl::UseScratchRegisterScope temps(
this);
MOZ_ASSERT(temps.IsAvailable(ScratchReg64));
// ip0
temps.Exclude(ScratchReg64);
// ip0 <- [sp]; sp += n; ret ip0
Ldr(ScratchReg64,
MemOperand(GetStackPointer64(), ptrdiff_t(n.value), vixl::PostIndex));
syncStackPtr();
// SP is always used to transmit the stack between calls.
Ret(ScratchReg64);
}
void j(Condition cond, Label* dest) { B(dest, cond); }
void branch(Condition cond, Label* label) { B(label, cond); }
void branch(JitCode* target) {
// It is unclear why this sync is necessary:
// * PSP and SP have been observed to be different in testcase
// tests/async/debugger-reject-after-fulfill.js
// * Removing the sync causes no failures in all of jit-tests.
//
// Also see jump() above. This is used only to implement jump(JitCode*)
// and only for JS, it appears.
syncStackPtr();
BufferOffset loc =
b(-1,
LabelDoc());
// The jump target will be patched by executableCopy().
addPendingJump(loc, ImmPtr(target->raw()), RelocationKind::JITCODE);
}
void compareDouble(FloatRegister lhs, FloatRegister rhs) {
Fcmp(ARMFPRegister(lhs, 64), ARMFPRegister(rhs, 64));
}
void compareFloat(FloatRegister lhs, FloatRegister rhs) {
Fcmp(ARMFPRegister(lhs, 32), ARMFPRegister(rhs, 32));
}
void compareSimd128Int(Assembler::Condition cond, ARMFPRegister dest,
ARMFPRegister lhs, ARMFPRegister rhs);
void compareSimd128Float(Assembler::Condition cond, ARMFPRegister dest,
ARMFPRegister lhs, ARMFPRegister rhs);
void rightShiftInt8x16(FloatRegister lhs,
Register rhs, FloatRegister dest,
bool isUnsigned);
void rightShiftInt16x8(FloatRegister lhs,
Register rhs, FloatRegister dest,
bool isUnsigned);
void rightShiftInt32x4(FloatRegister lhs,
Register rhs, FloatRegister dest,
bool isUnsigned);
void rightShiftInt64x2(FloatRegister lhs,
Register rhs, FloatRegister dest,
bool isUnsigned);
void boxDouble(FloatRegister src,
const ValueOperand& dest, FloatRegister) {
Fmov(ARMRegister(dest.valueReg(), 64), ARMFPRegister(src, 64));
}
void boxNonDouble(JSValueType type,
Register src,
const ValueOperand& dest) {
boxValue(type, src, dest.valueReg());
}
// Note that the |dest| register here may be ScratchReg, so we shouldn't use
// it.
void unboxInt32(
const ValueOperand& src,
Register dest) {
move32(src.valueReg(), dest);
}
void unboxInt32(
const Address& src,
Register dest) { load32(src, dest); }
void unboxInt32(
const BaseIndex& src,
Register dest) { load32(src, dest); }
template <
typename T>
void unboxDouble(
const T& src, FloatRegister dest) {
loadDouble(src, dest);
}
void unboxDouble(
const ValueOperand& src, FloatRegister dest) {
Fmov(ARMFPRegister(dest, 64), ARMRegister(src.valueReg(), 64));
}
void unboxArgObjMagic(
const ValueOperand& src,
Register dest) {
MOZ_CRASH(
"unboxArgObjMagic");
}
void unboxArgObjMagic(
const Address& src,
Register dest) {
MOZ_CRASH(
"unboxArgObjMagic");
}
void unboxBoolean(
const ValueOperand& src,
Register dest) {
move32(src.valueReg(), dest);
}
void unboxBoolean(
const Address& src,
Register dest) { load32(src, dest); }
void unboxBoolean(
const BaseIndex& src,
Register dest) { load32(src, dest); }
void unboxMagic(
const ValueOperand& src,
Register dest) {
move32(src.valueReg(), dest);
}
void unboxNonDouble(
const ValueOperand& src,
Register dest,
JSValueType type) {
unboxNonDouble(src.valueReg(), dest, type);
}
template <
typename T>
void unboxNonDouble(T src,
Register dest, JSValueType type) {
MOZ_ASSERT(type != JSVAL_TYPE_DOUBLE);
if (type == JSVAL_TYPE_INT32 || type == JSVAL_TYPE_BOOLEAN) {
load32(src, dest);
return;
}
loadPtr(src, dest);
unboxNonDouble(dest, dest, type);
}
void unboxNonDouble(
Register src,
Register dest, JSValueType type) {
MOZ_ASSERT(type != JSVAL_TYPE_DOUBLE);
if (type == JSVAL_TYPE_INT32 || type == JSVAL_TYPE_BOOLEAN) {
move32(src, dest);
return;
}
Eor(ARMRegister(dest, 64), ARMRegister(src, 64),
Operand(JSVAL_TYPE_TO_SHIFTED_TAG(type)));
}
void notBoolean(
const ValueOperand& val) {
ARMRegister r(val.valueReg(), 64);
eor(r, r, Operand(1));
}
void unboxObject(
const ValueOperand& src,
Register dest) {
unboxNonDouble(src.valueReg(), dest, JSVAL_TYPE_OBJECT);
}
void unboxObject(
Register src,
Register dest) {
unboxNonDouble(src, dest, JSVAL_TYPE_OBJECT);
}
void unboxObject(
const Address& src,
Register dest) {
loadPtr(src, dest);
unboxNonDouble(dest, dest, JSVAL_TYPE_OBJECT);
}
void unboxObject(
const BaseIndex& src,
Register dest) {
doBaseIndex(ARMRegister(dest, 64), src, vixl::LDR_x);
unboxNonDouble(dest, dest, JSVAL_TYPE_OBJECT);
}
template <
typename T>
void unboxObjectOrNull(
const T& src,
Register dest) {
unboxNonDouble(src, dest, JSVAL_TYPE_OBJECT);
And(ARMRegister(dest, 64), ARMRegister(dest, 64),
Operand(~JS::detail::ValueObjectOrNullBit));
}
// See comment in MacroAssembler-x64.h.
void unboxGCThingForGCBarrier(
const Address& src,
Register dest) {
loadPtr(src, dest);
And(ARMRegister(dest, 64), ARMRegister(dest, 64),
Operand(JS::detail::ValueGCThingPayloadMask));
}
void unboxGCThingForGCBarrier(
const ValueOperand& src,
Register dest) {
And(ARMRegister(dest, 64), ARMRegister(src.valueReg(), 64),
Operand(JS::detail::ValueGCThingPayloadMask));
}
void unboxWasmAnyRefGCThingForGCBarrier(
const Address& src,
Register dest) {
loadPtr(src, dest);
And(ARMRegister(dest, 64), ARMRegister(dest, 64),
Operand(wasm::AnyRef::GCThingMask));
}
// Like unboxGCThingForGCBarrier, but loads the GC thing's chunk base.
void getGCThingValueChunk(
Register src,
Register dest) {
And(ARMRegister(src, 64), ARMRegister(dest, 64),
Operand(JS::detail::ValueGCThingPayloadChunkMask));
}
void getGCThingValueChunk(
const Address& src,
Register dest) {
loadPtr(src, dest);
And(ARMRegister(dest, 64), ARMRegister(dest, 64),
Operand(JS::detail::ValueGCThingPayloadChunkMask));
}
void getGCThingValueChunk(
const ValueOperand& src,
Register dest) {
And(ARMRegister(dest, 64), ARMRegister(src.valueReg(), 64),
Operand(JS::detail::ValueGCThingPayloadChunkMask));
}
void getWasmAnyRefGCThingChunk(
Register src,
Register dest) {
And(ARMRegister(dest, 64), ARMRegister(src, 64),
Operand(wasm::AnyRef::GCThingChunkMask));
}
inline void unboxValue(
const ValueOperand& src, AnyRegister dest,
JSValueType type);
void unboxString(
const ValueOperand& operand,
Register dest) {
unboxNonDouble(operand, dest, JSVAL_TYPE_STRING);
}
void unboxString(
const Address& src,
Register dest) {
unboxNonDouble(src, dest, JSVAL_TYPE_STRING);
}
void unboxSymbol(
const ValueOperand& operand,
Register dest) {
unboxNonDouble(operand, dest, JSVAL_TYPE_SYMBOL);
}
void unboxSymbol(
const Address& src,
Register dest) {
unboxNonDouble(src, dest, JSVAL_TYPE_SYMBOL);
}
void unboxBigInt(
const ValueOperand& operand,
Register dest) {
unboxNonDouble(operand, dest, JSVAL_TYPE_BIGINT);
}
void unboxBigInt(
const Address& src,
Register dest) {
unboxNonDouble(src, dest, JSVAL_TYPE_BIGINT);
}
void loadConstantDouble(
double d, FloatRegister dest) {
ARMFPRegister r(dest, 64);
if (d == 0.0) {
// Clang11 does movi for 0 and movi+fneg for -0, and this seems like a
// good implementation-independent strategy as it avoids any gpr->fpr
// moves or memory traffic.
Movi(r, 0);
if (std::signbit(d)) {
Fneg(r, r);
}
}
else {
Fmov(r, d);
}
}
void loadConstantFloat32(
float f, FloatRegister dest) {
ARMFPRegister r(dest, 32);
if (f == 0.0) {
// See comments above. There's not a movi variant for a single register,
// so clear the double.
Movi(ARMFPRegister(dest, 64), 0);
if (std::signbit(f)) {
Fneg(r, r);
}
}
else {
Fmov(r, f);
}
}
void cmpTag(
Register tag, ImmTag ref) {
// As opposed to other architecture, splitTag is replaced by splitSignExtTag
// which extract the tag with a sign extension. The reason being that cmp32
// with a tag value would be too large to fit as a 12 bits immediate value,
// and would require the VIXL macro assembler to add an extra instruction
// and require extra scratch register to load the Tag value.
//
// Instead, we compare with the negative value of the sign extended tag with
// the CMN instruction. The sign extended tag is expected to be a negative
// value. Therefore the negative of the sign extended tag is expected to be
// near 0 and fit on 12 bits.
//
// Ignoring the sign extension, the logic is the following:
//
// CMP32(Reg, Tag) = Reg - Tag
// = Reg + (-Tag)
// = CMN32(Reg, -Tag)
//
// Note: testGCThing, testPrimitive and testNumber which are checking for
// inequalities should use unsigned comparisons (as done by default) in
// order to keep the same relation order after the sign extension, i.e.
// using Above or Below which are based on the carry flag.
uint32_t hiShift = JSVAL_TAG_SHIFT - 32;
int32_t seTag = int32_t(ref.value);
seTag = (seTag << hiShift) >> hiShift;
MOZ_ASSERT(seTag < 0);
int32_t negTag = -seTag;
// Check thest negTag is encoded on a 12 bits immediate value.
MOZ_ASSERT((negTag & ~0xFFF) == 0);
cmn32(tag, Imm32(negTag));
}
// Register-based tests.
Condition testUndefined(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_UNDEFINED));
return cond;
}
Condition testInt32(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_INT32));
return cond;
}
Condition testBoolean(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_BOOLEAN));
return cond;
}
Condition testNull(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_NULL));
return cond;
}
Condition testString(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_STRING));
return cond;
}
Condition testSymbol(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_SYMBOL));
return cond;
}
Condition testBigInt(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_BIGINT));
return cond;
}
Condition testObject(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_OBJECT));
return cond;
}
Condition testDouble(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_MAX_DOUBLE));
// Requires unsigned comparison due to cmpTag internals.
return (cond == Equal) ? BelowOrEqual : Above;
}
Condition testNumber(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JS::detail::ValueUpperInclNumberTag));
// Requires unsigned comparison due to cmpTag internals.
return (cond == Equal) ? BelowOrEqual : Above;
}
Condition testGCThing(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JS::detail::ValueLowerInclGCThingTag));
// Requires unsigned comparison due to cmpTag internals.
return (cond == Equal) ? AboveOrEqual : Below;
}
Condition testMagic(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JSVAL_TAG_MAGIC));
return cond;
}
Condition testPrimitive(Condition cond,
Register tag) {
MOZ_ASSERT(cond == Equal || cond == NotEqual);
cmpTag(tag, ImmTag(JS::detail::ValueUpperExclPrimitiveTag));
// Requires unsigned comparison due to cmpTag internals.
return (cond == Equal) ? Below : AboveOrEqual;
}
Condition testError(Condition cond,
Register tag) {
return testMagic(cond, tag);
}
// ValueOperand-based tests.
Condition testInt32(Condition cond,
const ValueOperand& value) {
// The incoming ValueOperand may use scratch registers.
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(scratch != value.valueReg());
splitSignExtTag(value, scratch);
return testInt32(cond, scratch);
}
Condition testBoolean(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testBoolean(cond, scratch);
}
Condition testDouble(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testDouble(cond, scratch);
}
Condition testNull(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testNull(cond, scratch);
}
Condition testUndefined(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testUndefined(cond, scratch);
}
Condition testString(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testString(cond, scratch);
}
Condition testSymbol(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testSymbol(cond, scratch);
}
Condition testBigInt(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testBigInt(cond, scratch);
}
Condition testObject(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testObject(cond, scratch);
}
Condition testNumber(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testNumber(cond, scratch);
}
Condition testPrimitive(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testPrimitive(cond, scratch);
}
Condition testMagic(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testMagic(cond, scratch);
}
Condition testGCThing(Condition cond,
const ValueOperand& value) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(value.valueReg() != scratch);
splitSignExtTag(value, scratch);
return testGCThing(cond, scratch);
}
Condition testError(Condition cond,
const ValueOperand& value) {
return testMagic(cond, value);
}
// Address-based tests.
Condition testGCThing(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testGCThing(cond, scratch);
}
Condition testMagic(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testMagic(cond, scratch);
}
Condition testInt32(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testInt32(cond, scratch);
}
Condition testDouble(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testDouble(cond, scratch);
}
Condition testBoolean(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testBoolean(cond, scratch);
}
Condition testNull(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testNull(cond, scratch);
}
Condition testUndefined(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testUndefined(cond, scratch);
}
Condition testString(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testString(cond, scratch);
}
Condition testSymbol(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
const Register scratch = temps.AcquireX().asUnsized();
MOZ_ASSERT(address.base != scratch);
splitSignExtTag(address, scratch);
return testSymbol(cond, scratch);
}
Condition testBigInt(Condition cond,
const Address& address) {
vixl::UseScratchRegisterScope temps(
this);
--> --------------------
--> maximum size reached
--> --------------------
