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blueloveTH 2023-09-22 20:48:54 +08:00
parent 12e955624e
commit 6ca35ed4b9
3 changed files with 25 additions and 19 deletions
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38
include/pocketpy/common.h
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@ -101,18 +101,19 @@ union BitsCvtImpl<4>{
NumberTraits<4>::float_t _float;
// 1 + 8 + 23
int sign() const noexcept { return _int >> 31; }
unsigned int exp() const noexcept { return (_int >> 23) & 0b1111'1111; }
uint64_t mantissa() const noexcept { return _int & 0x7fffff; }
int sign() const { return _int >> 31; }
unsigned int exp() const { return (_int >> 23) & 0b1111'1111; }
uint64_t mantissa() const { return _int & 0x7fffff; }
void set_exp(int exp) noexcept { _int = (_int & 0x807f'ffff) | (exp << 23); }
void set_sign(int sign) noexcept { _int = (_int & 0x7fff'ffff) | (sign << 31); }
void zero_mantissa() noexcept { _int &= 0xff80'0000; }
void set_exp(int exp) { _int = (_int & 0x807f'ffff) | (exp << 23); }
void set_sign(int sign) { _int = (_int & 0x7fff'ffff) | (sign << 31); }
void zero_mantissa() { _int &= 0xff80'0000; }
static constexpr int C0 = 127; // 2^7 - 1
static constexpr int C1 = -62; // 2 - 2^6
static constexpr int C2 = 63; // 2^6 - 1
static constexpr NumberTraits<4>::int_t C3 = 0b1011'1111'1111'1111'1111'1111'1111'1111;
static constexpr int C4 = 0b11111111;
BitsCvtImpl(NumberTraits<4>::float_t val): _float(val) {}
BitsCvtImpl(NumberTraits<4>::int_t val): _int(val) {}
@ -131,18 +132,19 @@ union BitsCvtImpl<8>{
NumberTraits<8>::float_t _float;
// 1 + 11 + 52
int sign() const noexcept { return _int >> 63; }
unsigned int exp() const noexcept { return (_int >> 52) & 0b0111'1111'1111; }
uint64_t mantissa() const noexcept { return _int & 0xfffffffffffff; }
int sign() const { return _int >> 63; }
unsigned int exp() const { return (_int >> 52) & 0b0111'1111'1111; }
uint64_t mantissa() const { return _int & 0xfffffffffffff; }
void set_exp(uint64_t exp) noexcept { _int = (_int & 0x800f'ffff'ffff'ffff) | (exp << 52); }
void set_sign(uint64_t sign) noexcept { _int = (_int & 0x7fff'ffff'ffff'ffff) | (sign << 63); }
void zero_mantissa() noexcept { _int &= 0xfff0'0000'0000'0000; }
void set_exp(uint64_t exp) { _int = (_int & 0x800f'ffff'ffff'ffff) | (exp << 52); }
void set_sign(uint64_t sign) { _int = (_int & 0x7fff'ffff'ffff'ffff) | (sign << 63); }
void zero_mantissa() { _int &= 0xfff0'0000'0000'0000; }
static constexpr int C0 = 1023; // 2^10 - 1
static constexpr int C1 = -510; // 2 - 2^9
static constexpr int C2 = 511; // 2^9 - 1
static constexpr NumberTraits<8>::int_t C3 = 0b1011'1111'1111'1111'1111'1111'1111'1111'1111'1111'1111'1111'1111'1111'1111'1111;
static constexpr int C4 = 0b11111111111;
BitsCvtImpl(NumberTraits<8>::float_t val): _float(val) {}
BitsCvtImpl(NumberTraits<8>::int_t val): _int(val) {}
@ -173,9 +175,9 @@ struct Type {
int index;
Type(): index(-1) {}
Type(int index): index(index) {}
bool operator==(Type other) const noexcept { return this->index == other.index; }
bool operator!=(Type other) const noexcept { return this->index != other.index; }
operator int() const noexcept { return this->index; }
bool operator==(Type other) const { return this->index == other.index; }
bool operator!=(Type other) const { return this->index != other.index; }
operator int() const { return this->index; }
};
#define PK_LAMBDA(x) ([](VM* vm, ArgsView args) { return x; })
@ -196,7 +198,6 @@ struct PyObject;
inline PyObject* tag_float(f64 val){
BitsCvt decomposed(val);
// std::cout << "tagging: " << val << std::endl;
// decomposed.print();
int sign = decomposed.sign();
int exp_7b = decomposed.exp() - BitsCvt::C0;
if(exp_7b < BitsCvt::C1){
@ -207,20 +208,19 @@ inline PyObject* tag_float(f64 val){
if(!std::isnan(val)) decomposed.zero_mantissa();
}
decomposed.set_exp(exp_7b + BitsCvt::C2);
// decomposed.print();
decomposed._int = (decomposed._int << 1) | 0b01;
decomposed.set_sign(sign);
// decomposed.print();
return reinterpret_cast<PyObject*>(decomposed._int);
}
inline f64 untag_float(PyObject* val){
BitsCvt decomposed(reinterpret_cast<Number::int_t>(val));
// std::cout << "untagging: " << val << std::endl;
decomposed._int = (decomposed._int >> 1) & BitsCvt::C3;
unsigned int exp_7b = decomposed.exp();
if(exp_7b == 0) return 0.0f;
if(exp_7b == BitsCvt::C0){
decomposed.set_exp(-1);
decomposed.set_exp(BitsCvt::C4);
return decomposed._float;
}
decomposed.set_exp(exp_7b - BitsCvt::C2 + BitsCvt::C0);

2
tests/01_int.py
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@ -2,6 +2,8 @@
assert 0xffff == 65535
assert 0xAAFFFF == 11206655
assert 0x7fffffff == 2147483647
# test 64-bit
assert 2**60-1 + 546 - 0xfffffffffffff == 1148417904979477026
# test == != >= <= < >
assert -1 == -1

4
tests/02_float.py
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@ -55,3 +55,7 @@ assert -1/0 == -inf
assert 1/inf == 0
assert -1/inf == 0
assert math.isnan(0/0)
assert 2**-600 == 0.0
assert 2.0 ** 600 == inf
assert (-2.0) ** 601 == -inf