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Commit 83987813 authored by svenpanne@chromium.org's avatar svenpanne@chromium.org
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Revert "Do away with variable length memcpy to Set/Get registers in simulator" 

This reverts r21148, it broke tests in debug mode, e.g.
mjsunit/regress/regress-observe-map-cache or mjsunit/debug-stepout-scope-part5.

TBR=bmeurer@chromium.org

Review URL: https://codereview.chromium.org/296823014

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21449 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
parent e61b69f5
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Showing with 334 additions and 310 deletions
src/arm64/simulator-arm64.cc
View file @ 83987813
......@@ -823,29 +823,49 @@ int Simulator::CodeFromName(const char* name) {
// Helpers ---------------------------------------------------------------------
template <typename T>
T Simulator::AddWithCarry(bool set_flags,
T src1,
T src2,
T carry_in) {
typedef typename make_unsigned<T>::type unsignedT;
int64_t Simulator::AddWithCarry(unsigned reg_size,
bool set_flags,
int64_t src1,
int64_t src2,
int64_t carry_in) {
ASSERT((carry_in == 0) || (carry_in == 1));
ASSERT((reg_size == kXRegSizeInBits) || (reg_size == kWRegSizeInBits));
T signed_sum = src1 + src2 + carry_in;
T result = signed_sum;
uint64_t u1, u2;
int64_t result;
int64_t signed_sum = src1 + src2 + carry_in;
bool N, Z, C, V;
unsignedT u1 = static_cast<unsignedT>(src1);
unsignedT u2 = static_cast<unsignedT>(src2);
// Compute the C flag by comparing the sum to the max unsigned integer.
C = ((std::numeric_limits<unsignedT>::max() - u1) < (u2 + carry_in)) ||
((std::numeric_limits<unsignedT>::max() - u1 - carry_in) < u2);
// Overflow iff the sign bit is the same for the two inputs and different
// for the result.
V = ((src1 ^ src2) >= 0) && ((src1 ^ result) < 0);
if (reg_size == kWRegSizeInBits) {
u1 = static_cast<uint64_t>(src1) & kWRegMask;
u2 = static_cast<uint64_t>(src2) & kWRegMask;
result = signed_sum & kWRegMask;
// Compute the C flag by comparing the sum to the max unsigned integer.
C = ((kWMaxUInt - u1) < (u2 + carry_in)) ||
((kWMaxUInt - u1 - carry_in) < u2);
// Overflow iff the sign bit is the same for the two inputs and different
// for the result.
int64_t s_src1 = src1 << (kXRegSizeInBits - kWRegSizeInBits);
int64_t s_src2 = src2 << (kXRegSizeInBits - kWRegSizeInBits);
int64_t s_result = result << (kXRegSizeInBits - kWRegSizeInBits);
V = ((s_src1 ^ s_src2) >= 0) && ((s_src1 ^ s_result) < 0);
} else {
u1 = static_cast<uint64_t>(src1);
u2 = static_cast<uint64_t>(src2);
N = CalcNFlag(result);
result = signed_sum;
// Compute the C flag by comparing the sum to the max unsigned integer.
C = ((kXMaxUInt - u1) < (u2 + carry_in)) ||
((kXMaxUInt - u1 - carry_in) < u2);
// Overflow iff the sign bit is the same for the two inputs and different
// for the result.
V = ((src1 ^ src2) >= 0) && ((src1 ^ result) < 0);
}
N = CalcNFlag(result, reg_size);
Z = CalcZFlag(result);
if (set_flags) {
......@@ -858,42 +878,33 @@ T Simulator::AddWithCarry(bool set_flags,
}
template<typename T>
void Simulator::AddSubWithCarry(Instruction* instr) {
T op2 = reg<T>(instr->Rm());
T new_val;
if ((instr->Mask(AddSubOpMask) == SUB) || instr->Mask(AddSubOpMask) == SUBS) {
op2 = ~op2;
}
new_val = AddWithCarry<T>(instr->FlagsUpdate(),
reg<T>(instr->Rn()),
op2,
nzcv().C());
set_reg<T>(instr->Rd(), new_val);
}
template <typename T>
T Simulator::ShiftOperand(T value, Shift shift_type, unsigned amount) {
typedef typename make_unsigned<T>::type unsignedT;
int64_t Simulator::ShiftOperand(unsigned reg_size,
int64_t value,
Shift shift_type,
unsigned amount) {
if (amount == 0) {
return value;
}
int64_t mask = reg_size == kXRegSizeInBits ? kXRegMask : kWRegMask;
switch (shift_type) {
case LSL:
return value << amount;
return (value << amount) & mask;
case LSR:
return static_cast<unsignedT>(value) >> amount;
case ASR:
return value >> amount;
case ROR:
return (static_cast<unsignedT>(value) >> amount) |
((value & ((1L << amount) - 1L)) <<
(sizeof(unsignedT) * 8 - amount));
return static_cast<uint64_t>(value) >> amount;
case ASR: {
// Shift used to restore the sign.
unsigned s_shift = kXRegSizeInBits - reg_size;
// Value with its sign restored.
int64_t s_value = (value << s_shift) >> s_shift;
return (s_value >> amount) & mask;
}
case ROR: {
if (reg_size == kWRegSizeInBits) {
value &= kWRegMask;
}
return (static_cast<uint64_t>(value) >> amount) |
((value & ((1L << amount) - 1L)) << (reg_size - amount));
}
default:
UNIMPLEMENTED();
return 0;
......@@ -901,12 +912,10 @@ T Simulator::ShiftOperand(T value, Shift shift_type, unsigned amount) {
}
template <typename T>
T Simulator::ExtendValue(T value, Extend extend_type, unsigned left_shift) {
const unsigned kSignExtendBShift = (sizeof(T) - 1) * 8;
const unsigned kSignExtendHShift = (sizeof(T) - 2) * 8;
const unsigned kSignExtendWShift = (sizeof(T) - 4) * 8;
int64_t Simulator::ExtendValue(unsigned reg_size,
int64_t value,
Extend extend_type,
unsigned left_shift) {
switch (extend_type) {
case UXTB:
value &= kByteMask;
......@@ -918,13 +927,13 @@ T Simulator::ExtendValue(T value, Extend extend_type, unsigned left_shift) {
value &= kWordMask;
break;
case SXTB:
value = (value << kSignExtendBShift) >> kSignExtendBShift;
value = (value << 56) >> 56;
break;
case SXTH:
value = (value << kSignExtendHShift) >> kSignExtendHShift;
value = (value << 48) >> 48;
break;
case SXTW:
value = (value << kSignExtendWShift) >> kSignExtendWShift;
value = (value << 32) >> 32;
break;
case UXTX:
case SXTX:
......@@ -932,21 +941,8 @@ T Simulator::ExtendValue(T value, Extend extend_type, unsigned left_shift) {
default:
UNREACHABLE();
}
return value << left_shift;
}
template <typename T>
void Simulator::Extract(Instruction* instr) {
unsigned lsb = instr->ImmS();
T op2 = reg<T>(instr->Rm());
T result = op2;
if (lsb) {
T op1 = reg<T>(instr->Rn());
result = op2 >> lsb | (op1 << ((sizeof(T) * 8) - lsb));
}
set_reg<T>(instr->Rd(), result);
int64_t mask = (reg_size == kXRegSizeInBits) ? kXRegMask : kWRegMask;
return (value << left_shift) & mask;
}
......@@ -1260,110 +1256,110 @@ void Simulator::VisitCompareBranch(Instruction* instr) {
}
template<typename T>
void Simulator::AddSubHelper(Instruction* instr, T op2) {
void Simulator::AddSubHelper(Instruction* instr, int64_t op2) {
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
bool set_flags = instr->FlagsUpdate();
T new_val = 0;
int64_t new_val = 0;
Instr operation = instr->Mask(AddSubOpMask);
switch (operation) {
case ADD:
case ADDS: {
new_val = AddWithCarry<T>(set_flags,
reg<T>(instr->Rn(), instr->RnMode()),
op2);
new_val = AddWithCarry(reg_size,
set_flags,
reg(reg_size, instr->Rn(), instr->RnMode()),
op2);
break;
}
case SUB:
case SUBS: {
new_val = AddWithCarry<T>(set_flags,
reg<T>(instr->Rn(), instr->RnMode()),
~op2,
1);
new_val = AddWithCarry(reg_size,
set_flags,
reg(reg_size, instr->Rn(), instr->RnMode()),
~op2,
1);
break;
}
default: UNREACHABLE();
}
set_reg<T>(instr->Rd(), new_val, instr->RdMode());
set_reg(reg_size, instr->Rd(), new_val, instr->RdMode());
}
void Simulator::VisitAddSubShifted(Instruction* instr) {
Shift shift_type = static_cast<Shift>(instr->ShiftDP());
unsigned shift_amount = instr->ImmDPShift();
if (instr->SixtyFourBits()) {
int64_t op2 = ShiftOperand(xreg(instr->Rm()), shift_type, shift_amount);
AddSubHelper(instr, op2);
} else {
int32_t op2 = ShiftOperand(wreg(instr->Rm()), shift_type, shift_amount);
AddSubHelper(instr, op2);
}
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
int64_t op2 = ShiftOperand(reg_size,
reg(reg_size, instr->Rm()),
static_cast<Shift>(instr->ShiftDP()),
instr->ImmDPShift());
AddSubHelper(instr, op2);
}
void Simulator::VisitAddSubImmediate(Instruction* instr) {
int64_t op2 = instr->ImmAddSub() << ((instr->ShiftAddSub() == 1) ? 12 : 0);
if (instr->SixtyFourBits()) {
AddSubHelper<int64_t>(instr, op2);
} else {
AddSubHelper<int32_t>(instr, op2);
}
AddSubHelper(instr, op2);
}
void Simulator::VisitAddSubExtended(Instruction* instr) {
Extend ext = static_cast<Extend>(instr->ExtendMode());
unsigned left_shift = instr->ImmExtendShift();
if (instr->SixtyFourBits()) {
int64_t op2 = ExtendValue(xreg(instr->Rm()), ext, left_shift);
AddSubHelper(instr, op2);
} else {
int32_t op2 = ExtendValue(wreg(instr->Rm()), ext, left_shift);
AddSubHelper(instr, op2);
}
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
int64_t op2 = ExtendValue(reg_size,
reg(reg_size, instr->Rm()),
static_cast<Extend>(instr->ExtendMode()),
instr->ImmExtendShift());
AddSubHelper(instr, op2);
}
void Simulator::VisitAddSubWithCarry(Instruction* instr) {
if (instr->SixtyFourBits()) {
AddSubWithCarry<int64_t>(instr);
} else {
AddSubWithCarry<int32_t>(instr);
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
int64_t op2 = reg(reg_size, instr->Rm());
int64_t new_val;
if ((instr->Mask(AddSubOpMask) == SUB) || instr->Mask(AddSubOpMask) == SUBS) {
op2 = ~op2;
}
new_val = AddWithCarry(reg_size,
instr->FlagsUpdate(),
reg(reg_size, instr->Rn()),
op2,
nzcv().C());
set_reg(reg_size, instr->Rd(), new_val);
}
void Simulator::VisitLogicalShifted(Instruction* instr) {
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
Shift shift_type = static_cast<Shift>(instr->ShiftDP());
unsigned shift_amount = instr->ImmDPShift();
if (instr->SixtyFourBits()) {
int64_t op2 = ShiftOperand(xreg(instr->Rm()), shift_type, shift_amount);
op2 = (instr->Mask(NOT) == NOT) ? ~op2 : op2;
LogicalHelper<int64_t>(instr, op2);
} else {
int32_t op2 = ShiftOperand(wreg(instr->Rm()), shift_type, shift_amount);
op2 = (instr->Mask(NOT) == NOT) ? ~op2 : op2;
LogicalHelper<int32_t>(instr, op2);
int64_t op2 = ShiftOperand(reg_size, reg(reg_size, instr->Rm()), shift_type,
shift_amount);
if (instr->Mask(NOT) == NOT) {
op2 = ~op2;
}
LogicalHelper(instr, op2);
}
void Simulator::VisitLogicalImmediate(Instruction* instr) {
if (instr->SixtyFourBits()) {
LogicalHelper<int64_t>(instr, instr->ImmLogical());
} else {
LogicalHelper<int32_t>(instr, instr->ImmLogical());
}
LogicalHelper(instr, instr->ImmLogical());
}
template<typename T>
void Simulator::LogicalHelper(Instruction* instr, T op2) {
T op1 = reg<T>(instr->Rn());
T result = 0;
void Simulator::LogicalHelper(Instruction* instr, int64_t op2) {
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
int64_t op1 = reg(reg_size, instr->Rn());
int64_t result = 0;
bool update_flags = false;
// Switch on the logical operation, stripping out the NOT bit, as it has a
......@@ -1378,46 +1374,41 @@ void Simulator::LogicalHelper(Instruction* instr, T op2) {
}
if (update_flags) {
nzcv().SetN(CalcNFlag(result));
nzcv().SetN(CalcNFlag(result, reg_size));
nzcv().SetZ(CalcZFlag(result));
nzcv().SetC(0);
nzcv().SetV(0);
}
set_reg<T>(instr->Rd(), result, instr->RdMode());
set_reg(reg_size, instr->Rd(), result, instr->RdMode());
}
void Simulator::VisitConditionalCompareRegister(Instruction* instr) {
if (instr->SixtyFourBits()) {
ConditionalCompareHelper(instr, xreg(instr->Rm()));
} else {
ConditionalCompareHelper(instr, wreg(instr->Rm()));
}
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
ConditionalCompareHelper(instr, reg(reg_size, instr->Rm()));
}
void Simulator::VisitConditionalCompareImmediate(Instruction* instr) {
if (instr->SixtyFourBits()) {
ConditionalCompareHelper<int64_t>(instr, instr->ImmCondCmp());
} else {
ConditionalCompareHelper<int32_t>(instr, instr->ImmCondCmp());
}
ConditionalCompareHelper(instr, instr->ImmCondCmp());
}
template<typename T>
void Simulator::ConditionalCompareHelper(Instruction* instr, T op2) {
T op1 = reg<T>(instr->Rn());
void Simulator::ConditionalCompareHelper(Instruction* instr, int64_t op2) {
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
int64_t op1 = reg(reg_size, instr->Rn());
if (ConditionPassed(static_cast<Condition>(instr->Condition()))) {
// If the condition passes, set the status flags to the result of comparing
// the operands.
if (instr->Mask(ConditionalCompareMask) == CCMP) {
AddWithCarry<T>(true, op1, ~op2, 1);
AddWithCarry(reg_size, true, op1, ~op2, 1);
} else {
ASSERT(instr->Mask(ConditionalCompareMask) == CCMN);
AddWithCarry<T>(true, op1, op2, 0);
AddWithCarry(reg_size, true, op1, op2, 0);
}
} else {
// If the condition fails, set the status flags to the nzcv immediate.
......@@ -1452,7 +1443,8 @@ void Simulator::VisitLoadStoreRegisterOffset(Instruction* instr) {
ASSERT((ext == UXTW) || (ext == UXTX) || (ext == SXTW) || (ext == SXTX));
unsigned shift_amount = instr->ImmShiftLS() * instr->SizeLS();
int64_t offset = ExtendValue(xreg(instr->Rm()), ext, shift_amount);
int64_t offset = ExtendValue(kXRegSizeInBits, xreg(instr->Rm()), ext,
shift_amount);
LoadStoreHelper(instr, offset, Offset);
}
......@@ -1492,23 +1484,28 @@ void Simulator::LoadStoreHelper(Instruction* instr,
case STR_w:
case STR_x: MemoryWrite(address, xreg(srcdst), num_bytes); break;
case LDRSB_w: {
set_wreg(srcdst, ExtendValue<int32_t>(MemoryRead8(address), SXTB));
set_wreg(srcdst,
ExtendValue(kWRegSizeInBits, MemoryRead8(address), SXTB));
break;
}
case LDRSB_x: {
set_xreg(srcdst, ExtendValue<int64_t>(MemoryRead8(address), SXTB));
set_xreg(srcdst,
ExtendValue(kXRegSizeInBits, MemoryRead8(address), SXTB));
break;
}
case LDRSH_w: {
set_wreg(srcdst, ExtendValue<int32_t>(MemoryRead16(address), SXTH));
set_wreg(srcdst,
ExtendValue(kWRegSizeInBits, MemoryRead16(address), SXTH));
break;
}
case LDRSH_x: {
set_xreg(srcdst, ExtendValue<int64_t>(MemoryRead16(address), SXTH));
set_xreg(srcdst,
ExtendValue(kXRegSizeInBits, MemoryRead16(address), SXTH));
break;
}
case LDRSW_x: {
set_xreg(srcdst, ExtendValue<int64_t>(MemoryRead32(address), SXTW));
set_xreg(srcdst,
ExtendValue(kXRegSizeInBits, MemoryRead32(address), SXTW));
break;
}
case LDR_s: set_sreg(srcdst, MemoryReadFP32(address)); break;
......@@ -1608,8 +1605,8 @@ void Simulator::LoadStorePairHelper(Instruction* instr,
break;
}
case LDPSW_x: {
set_xreg(rt, ExtendValue<int64_t>(MemoryRead32(address), SXTW));
set_xreg(rt2, ExtendValue<int64_t>(
set_xreg(rt, ExtendValue(kXRegSizeInBits, MemoryRead32(address), SXTW));
set_xreg(rt2, ExtendValue(kXRegSizeInBits,
MemoryRead32(address + kWRegSize), SXTW));
break;
}
......@@ -1825,26 +1822,25 @@ void Simulator::VisitMoveWideImmediate(Instruction* instr) {
void Simulator::VisitConditionalSelect(Instruction* instr) {
uint64_t new_val = xreg(instr->Rn());
if (ConditionFailed(static_cast<Condition>(instr->Condition()))) {
uint64_t new_val = xreg(instr->Rm());
new_val = xreg(instr->Rm());
switch (instr->Mask(ConditionalSelectMask)) {
case CSEL_w: set_wreg(instr->Rd(), new_val); break;
case CSEL_x: set_xreg(instr->Rd(), new_val); break;
case CSINC_w: set_wreg(instr->Rd(), new_val + 1); break;
case CSINC_x: set_xreg(instr->Rd(), new_val + 1); break;
case CSINV_w: set_wreg(instr->Rd(), ~new_val); break;
case CSINV_x: set_xreg(instr->Rd(), ~new_val); break;
case CSNEG_w: set_wreg(instr->Rd(), -new_val); break;
case CSNEG_x: set_xreg(instr->Rd(), -new_val); break;
case CSEL_w:
case CSEL_x: break;
case CSINC_w:
case CSINC_x: new_val++; break;
case CSINV_w:
case CSINV_x: new_val = ~new_val; break;
case CSNEG_w:
case CSNEG_x: new_val = -new_val; break;
default: UNIMPLEMENTED();
}
} else {
if (instr->SixtyFourBits()) {
set_xreg(instr->Rd(), xreg(instr->Rn()));
} else {
set_wreg(instr->Rd(), wreg(instr->Rn()));
}
}
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
set_reg(reg_size, instr->Rd(), new_val);
}
......@@ -1915,17 +1911,28 @@ uint64_t Simulator::ReverseBytes(uint64_t value, ReverseByteMode mode) {
}
template <typename T>
void Simulator::DataProcessing2Source(Instruction* instr) {
void Simulator::VisitDataProcessing2Source(Instruction* instr) {
Shift shift_op = NO_SHIFT;
T result = 0;
int64_t result = 0;
switch (instr->Mask(DataProcessing2SourceMask)) {
case SDIV_w:
case SDIV_w: {
int32_t rn = wreg(instr->Rn());
int32_t rm = wreg(instr->Rm());
if ((rn == kWMinInt) && (rm == -1)) {
result = kWMinInt;
} else if (rm == 0) {
// Division by zero can be trapped, but not on A-class processors.
result = 0;
} else {
result = rn / rm;
}
break;
}
case SDIV_x: {
T rn = reg<T>(instr->Rn());
T rm = reg<T>(instr->Rm());
if ((rn == std::numeric_limits<T>::min()) && (rm == -1)) {
result = std::numeric_limits<T>::min();
int64_t rn = xreg(instr->Rn());
int64_t rm = xreg(instr->Rm());
if ((rn == kXMinInt) && (rm == -1)) {
result = kXMinInt;
} else if (rm == 0) {
// Division by zero can be trapped, but not on A-class processors.
result = 0;
......@@ -1934,11 +1941,20 @@ void Simulator::DataProcessing2Source(Instruction* instr) {
}
break;
}
case UDIV_w:
case UDIV_w: {
uint32_t rn = static_cast<uint32_t>(wreg(instr->Rn()));
uint32_t rm = static_cast<uint32_t>(wreg(instr->Rm()));
if (rm == 0) {
// Division by zero can be trapped, but not on A-class processors.
result = 0;
} else {
result = rn / rm;
}
break;
}
case UDIV_x: {
typedef typename make_unsigned<T>::type unsignedT;
unsignedT rn = static_cast<unsignedT>(reg<T>(instr->Rn()));
unsignedT rm = static_cast<unsignedT>(reg<T>(instr->Rm()));
uint64_t rn = static_cast<uint64_t>(xreg(instr->Rn()));
uint64_t rm = static_cast<uint64_t>(xreg(instr->Rm()));
if (rm == 0) {
// Division by zero can be trapped, but not on A-class processors.
result = 0;
......@@ -1958,27 +1974,18 @@ void Simulator::DataProcessing2Source(Instruction* instr) {
default: UNIMPLEMENTED();
}
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
if (shift_op != NO_SHIFT) {
// Shift distance encoded in the least-significant five/six bits of the
// register.
unsigned shift = wreg(instr->Rm());
if (sizeof(T) == kWRegSize) {
shift &= kShiftAmountWRegMask;
} else {
shift &= kShiftAmountXRegMask;
}
result = ShiftOperand(reg<T>(instr->Rn()), shift_op, shift);
}
set_reg<T>(instr->Rd(), result);
}
void Simulator::VisitDataProcessing2Source(Instruction* instr) {
if (instr->SixtyFourBits()) {
DataProcessing2Source<int64_t>(instr);
} else {
DataProcessing2Source<int32_t>(instr);
int mask = (instr->SixtyFourBits() == 1) ? kShiftAmountXRegMask
: kShiftAmountWRegMask;
unsigned shift = wreg(instr->Rm()) & mask;
result = ShiftOperand(reg_size, reg(reg_size, instr->Rn()), shift_op,
shift);
}
set_reg(reg_size, instr->Rd(), result);
}
......@@ -2005,6 +2012,9 @@ static int64_t MultiplyHighSigned(int64_t u, int64_t v) {
void Simulator::VisitDataProcessing3Source(Instruction* instr) {
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
int64_t result = 0;
// Extract and sign- or zero-extend 32-bit arguments for widening operations.
uint64_t rn_u32 = reg<uint32_t>(instr->Rn());
......@@ -2030,26 +2040,21 @@ void Simulator::VisitDataProcessing3Source(Instruction* instr) {
break;
default: UNIMPLEMENTED();
}
if (instr->SixtyFourBits()) {
set_xreg(instr->Rd(), result);
} else {
set_wreg(instr->Rd(), result);
}
set_reg(reg_size, instr->Rd(), result);
}
template <typename T>
void Simulator::BitfieldHelper(Instruction* instr) {
typedef typename make_unsigned<T>::type unsignedT;
T reg_size = sizeof(T) * 8;
T R = instr->ImmR();
T S = instr->ImmS();
T diff = S - R;
T mask;
void Simulator::VisitBitfield(Instruction* instr) {
unsigned reg_size = instr->SixtyFourBits() ? kXRegSizeInBits
: kWRegSizeInBits;
int64_t reg_mask = instr->SixtyFourBits() ? kXRegMask : kWRegMask;
int64_t R = instr->ImmR();
int64_t S = instr->ImmS();
int64_t diff = S - R;
int64_t mask;
if (diff >= 0) {
mask = diff < reg_size - 1 ? (static_cast<T>(1) << (diff + 1)) - 1
: static_cast<T>(-1);
mask = diff < reg_size - 1 ? (1L << (diff + 1)) - 1
: reg_mask;
} else {
mask = ((1L << (S + 1)) - 1);
mask = (static_cast<uint64_t>(mask) >> R) | (mask << (reg_size - R));
......@@ -2078,37 +2083,30 @@ void Simulator::BitfieldHelper(Instruction* instr) {
UNIMPLEMENTED();
}
T dst = inzero ? 0 : reg<T>(instr->Rd());
T src = reg<T>(instr->Rn());
int64_t dst = inzero ? 0 : reg(reg_size, instr->Rd());
int64_t src = reg(reg_size, instr->Rn());
// Rotate source bitfield into place.
T result = (static_cast<unsignedT>(src) >> R) | (src << (reg_size - R));
int64_t result = (static_cast<uint64_t>(src) >> R) | (src << (reg_size - R));
// Determine the sign extension.
T topbits_preshift = (static_cast<T>(1) << (reg_size - diff - 1)) - 1;
T signbits = (extend && ((src >> S) & 1) ? topbits_preshift : 0)
<< (diff + 1);
int64_t topbits_preshift = (1L << (reg_size - diff - 1)) - 1;
int64_t signbits = (extend && ((src >> S) & 1) ? topbits_preshift : 0)
<< (diff + 1);
// Merge sign extension, dest/zero and bitfield.
result = signbits | (result & mask) | (dst & ~mask);
set_reg<T>(instr->Rd(), result);
}
void Simulator::VisitBitfield(Instruction* instr) {
if (instr->SixtyFourBits()) {
BitfieldHelper<int64_t>(instr);
} else {
BitfieldHelper<int32_t>(instr);
}
set_reg(reg_size, instr->Rd(), result);
}
void Simulator::VisitExtract(Instruction* instr) {
if (instr->SixtyFourBits()) {
Extract<uint64_t>(instr);
} else {
Extract<uint32_t>(instr);
}
unsigned lsb = instr->ImmS();
unsigned reg_size = (instr->SixtyFourBits() == 1) ? kXRegSizeInBits
: kWRegSizeInBits;
set_reg(reg_size,
instr->Rd(),
(static_cast<uint64_t>(reg(reg_size, instr->Rm())) >> lsb) |
(reg(reg_size, instr->Rn()) << (reg_size - lsb)));
}
......
src/arm64/simulator-arm64.h
View file @ 83987813
......@@ -133,28 +133,35 @@ class SimSystemRegister {
// Represent a register (r0-r31, v0-v31).
template<int kSizeInBytes>
class SimRegisterBase {
public:
template<typename T>
void Set(T new_value) {
value_ = 0;
memcpy(&value_, &new_value, sizeof(T));
void Set(T new_value, unsigned size = sizeof(T)) {
ASSERT(size <= kSizeInBytes);
ASSERT(size <= sizeof(new_value));
// All AArch64 registers are zero-extending; Writing a W register clears the
// top bits of the corresponding X register.
memset(value_, 0, kSizeInBytes);
memcpy(value_, &new_value, size);
}
// Copy 'size' bytes of the register to the result, and zero-extend to fill
// the result.
template<typename T>
T Get() const {
T Get(unsigned size = sizeof(T)) const {
ASSERT(size <= kSizeInBytes);
T result;
memcpy(&result, &value_, sizeof(T));
memset(&result, 0, sizeof(result));
memcpy(&result, value_, size);
return result;
}
protected:
int64_t value_;
uint8_t value_[kSizeInBytes];
};
typedef SimRegisterBase SimRegister; // r0-r31
typedef SimRegisterBase SimFPRegister; // v0-v31
typedef SimRegisterBase<kXRegSize> SimRegister; // r0-r31
typedef SimRegisterBase<kDRegSize> SimFPRegister; // v0-v31
class Simulator : public DecoderVisitor {
......@@ -321,53 +328,86 @@ class Simulator : public DecoderVisitor {
VISITOR_LIST(DECLARE)
#undef DECLARE
bool IsZeroRegister(unsigned code, Reg31Mode r31mode) const {
return ((code == 31) && (r31mode == Reg31IsZeroRegister));
}
// Register accessors.
// Return 'size' bits of the value of an integer register, as the specified
// type. The value is zero-extended to fill the result.
//
// The only supported values of 'size' are kXRegSizeInBits and
// kWRegSizeInBits.
template<typename T>
T reg(unsigned code, Reg31Mode r31mode = Reg31IsZeroRegister) const {
T reg(unsigned size, unsigned code,
Reg31Mode r31mode = Reg31IsZeroRegister) const {
unsigned size_in_bytes = size / 8;
ASSERT(size_in_bytes <= sizeof(T));
ASSERT((size == kXRegSizeInBits) || (size == kWRegSizeInBits));
ASSERT(code < kNumberOfRegisters);
if (IsZeroRegister(code, r31mode)) {
return 0;
if ((code == 31) && (r31mode == Reg31IsZeroRegister)) {
T result;
memset(&result, 0, sizeof(result));
return result;
}
return registers_[code].Get<T>();
return registers_[code].Get<T>(size_in_bytes);
}
// Like reg(), but infer the access size from the template type.
template<typename T>
T reg(unsigned code, Reg31Mode r31mode = Reg31IsZeroRegister) const {
return reg<T>(sizeof(T) * 8, code, r31mode);
}
// Common specialized accessors for the reg() template.
int32_t wreg(unsigned code, Reg31Mode r31mode = Reg31IsZeroRegister) const {
int32_t wreg(unsigned code,
Reg31Mode r31mode = Reg31IsZeroRegister) const {
return reg<int32_t>(code, r31mode);
}
int64_t xreg(unsigned code, Reg31Mode r31mode = Reg31IsZeroRegister) const {
int64_t xreg(unsigned code,
Reg31Mode r31mode = Reg31IsZeroRegister) const {
return reg<int64_t>(code, r31mode);
}
int64_t reg(unsigned size, unsigned code,
Reg31Mode r31mode = Reg31IsZeroRegister) const {
return reg<int64_t>(size, code, r31mode);
}
// Write 'size' bits of 'value' into an integer register. The value is
// zero-extended. This behaviour matches AArch64 register writes.
//
// The only supported values of 'size' are kXRegSizeInBits and
// kWRegSizeInBits.
template<typename T>
void set_reg(unsigned size, unsigned code, T value,
Reg31Mode r31mode = Reg31IsZeroRegister) {
unsigned size_in_bytes = size / 8;
ASSERT(size_in_bytes <= sizeof(T));
ASSERT((size == kXRegSizeInBits) || (size == kWRegSizeInBits));
ASSERT(code < kNumberOfRegisters);
if ((code == 31) && (r31mode == Reg31IsZeroRegister)) {
return;
}
return registers_[code].Set(value, size_in_bytes);
}
// Like set_reg(), but infer the access size from the template type.
template<typename T>
void set_reg(unsigned code, T value,
Reg31Mode r31mode = Reg31IsZeroRegister) {
ASSERT(code < kNumberOfRegisters);
if (!IsZeroRegister(code, r31mode))
registers_[code].Set(value);
set_reg(sizeof(value) * 8, code, value, r31mode);
}
// Common specialized accessors for the set_reg() template.
void set_wreg(unsigned code, int32_t value,
Reg31Mode r31mode = Reg31IsZeroRegister) {
set_reg(code, value, r31mode);
set_reg(kWRegSizeInBits, code, value, r31mode);
}
void set_xreg(unsigned code, int64_t value,
Reg31Mode r31mode = Reg31IsZeroRegister) {
set_reg(code, value, r31mode);
set_reg(kXRegSizeInBits, code, value, r31mode);
}
// Commonly-used special cases.
......@@ -392,10 +432,24 @@ class Simulator : public DecoderVisitor {
Address get_sp() { return reg<Address>(31, Reg31IsStackPointer); }
// Return 'size' bits of the value of a floating-point register, as the
// specified type. The value is zero-extended to fill the result.
//
// The only supported values of 'size' are kDRegSizeInBits and
// kSRegSizeInBits.
template<typename T>
T fpreg(unsigned size, unsigned code) const {
unsigned size_in_bytes = size / 8;
ASSERT(size_in_bytes <= sizeof(T));
ASSERT((size == kDRegSizeInBits) || (size == kSRegSizeInBits));
ASSERT(code < kNumberOfFPRegisters);
return fpregisters_[code].Get<T>(size_in_bytes);
}
// Like fpreg(), but infer the access size from the template type.
template<typename T>
T fpreg(unsigned code) const {
ASSERT(code < kNumberOfRegisters);
return fpregisters_[code].Get<T>();
return fpreg<T>(sizeof(T) * 8, code);
}
// Common specialized accessors for the fpreg() template.
......@@ -431,7 +485,7 @@ class Simulator : public DecoderVisitor {
void set_fpreg(unsigned code, T value) {
ASSERT((sizeof(value) == kDRegSize) || (sizeof(value) == kSRegSize));
ASSERT(code < kNumberOfFPRegisters);
fpregisters_[code].Set(value);
fpregisters_[code].Set(value, sizeof(value));
}
// Common specialized accessors for the set_fpreg() template.
......@@ -571,19 +625,14 @@ class Simulator : public DecoderVisitor {
return !ConditionPassed(cond);
}
template<typename T>
void AddSubHelper(Instruction* instr, T op2);
template<typename T>
T AddWithCarry(bool set_flags,
T src1,
T src2,
T carry_in = 0);
template<typename T>
void AddSubWithCarry(Instruction* instr);
template<typename T>
void LogicalHelper(Instruction* instr, T op2);
template<typename T>
void ConditionalCompareHelper(Instruction* instr, T op2);
void AddSubHelper(Instruction* instr, int64_t op2);
int64_t AddWithCarry(unsigned reg_size,
bool set_flags,
int64_t src1,
int64_t src2,
int64_t carry_in = 0);
void LogicalHelper(Instruction* instr, int64_t op2);
void ConditionalCompareHelper(Instruction* instr, int64_t op2);
void LoadStoreHelper(Instruction* instr,
int64_t offset,
AddrMode addrmode);
......@@ -610,21 +659,18 @@ class Simulator : public DecoderVisitor {
void MemoryWrite64(uint8_t* address, uint64_t value);
void MemoryWriteFP64(uint8_t* address, double value);
template <typename T>
T ShiftOperand(T value,
int64_t ShiftOperand(unsigned reg_size,
int64_t value,
Shift shift_type,
unsigned amount);
int64_t Rotate(unsigned reg_width,
int64_t value,
Shift shift_type,
unsigned amount);
template <typename T>
T ExtendValue(T value,
Extend extend_type,
unsigned left_shift = 0);
template <typename T>
void Extract(Instruction* instr);
template <typename T>
void DataProcessing2Source(Instruction* instr);
template <typename T>
void BitfieldHelper(Instruction* instr);
int64_t ExtendValue(unsigned reg_width,
int64_t value,
Extend extend_type,
unsigned left_shift = 0);
uint64_t ReverseBits(uint64_t value, unsigned num_bits);
uint64_t ReverseBytes(uint64_t value, ReverseByteMode mode);
......@@ -750,9 +796,8 @@ class Simulator : public DecoderVisitor {
// is irrelevant, and is not checked here.
}
template <typename T>
static int CalcNFlag(T result) {
return (result >> (sizeof(T) * 8 - 1)) & 1;
static int CalcNFlag(uint64_t result, unsigned reg_size) {
return (result >> (reg_size - 1)) & 1;
}
static int CalcZFlag(uint64_t result) {
......
src/utils.h
View file @ 83987813
......@@ -233,25 +233,6 @@ inline int32_t WhichPowerOf2Abs(int32_t x) {
}
// Obtains the unsigned type corresponding to T
// available in C++11 as std::make_unsigned
template<typename T>
struct make_unsigned {
typedef T type;
};
// Template specializations necessary to have make_unsigned work
template<> struct make_unsigned<int32_t> {
typedef uint32_t type;
};
template<> struct make_unsigned<int64_t> {
typedef uint64_t type;
};
// ----------------------------------------------------------------------------
// BitField is a help template for encoding and decode bitfield with
// unsigned content.
......
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