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fix bitCast for big integers

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and make bigfloat use __float128
This commit is contained in:
Andrew Kelley
2017-08-17 22:52:12 -04:00
parent 2173e1f457
commit 1b5d61bee9
6 changed files with 66 additions and 10 deletions
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15
src/bigfloat.cpp
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@@ -11,7 +11,7 @@
#include <math.h>
#include <errno.h>
void bigfloat_init_float(BigFloat *dest, long double x) {
void bigfloat_init_float(BigFloat *dest, __float128 x) {
dest->value = x;
}
@@ -24,13 +24,13 @@ void bigfloat_init_bigint(BigFloat *dest, const BigInt *op) {
if (op->digit_count == 0)
return;
long double base = (long double)UINT64_MAX;
__float128 base = (__float128)UINT64_MAX;
const uint64_t *digits = bigint_ptr(op);
for (size_t i = op->digit_count - 1;;) {
uint64_t digit = digits[i];
dest->value *= base;
dest->value += (long double)digit;
dest->value += (__float128)digit;
if (i == 0) {
if (op->is_negative) {
@@ -96,7 +96,7 @@ void bigfloat_mod(BigFloat *dest, const BigFloat *op1, const BigFloat *op2) {
}
void bigfloat_write_buf(Buf *buf, const BigFloat *op) {
buf_appendf(buf, "%Lf", op->value);
buf_appendf(buf, "%Lf", (long double)op->value);
}
Cmp bigfloat_cmp(const BigFloat *op1, const BigFloat *op2) {
@@ -117,6 +117,9 @@ void bigfloat_write_ieee597(const BigFloat *op, uint8_t *buf, size_t bit_count,
} else if (bit_count == 64) {
double f64 = op->value;
memcpy(buf, &f64, 8);
} else if (bit_count == 128) {
__float128 f128 = op->value;
memcpy(buf, &f128, 16);
} else {
zig_unreachable();
}
@@ -132,6 +135,10 @@ void bigfloat_read_ieee597(BigFloat *dest, const uint8_t *buf, size_t bit_count,
double f64;
memcpy(&f64, buf, 8);
dest->value = f64;
} else if (bit_count == 128) {
__float128 f128;
memcpy(&f128, buf, 16);
dest->value = f128;
} else {
zig_unreachable();
}