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Make float_decode_internal mantissa int

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This commit is contained in:
Nobuyoshi Nakada 2019-08-02 19:04:38 +09:00
parent 6640eeb6db
commit 9921b63ac4
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1 changed files with 17 additions and 21 deletions
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38
rational.c
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@ -2165,16 +2165,14 @@ integer_rationalize(int argc, VALUE *argv, VALUE self)
}
static void
float_decode_internal(VALUE self, VALUE *rf, VALUE *rn)
float_decode_internal(VALUE self, VALUE *rf, int *n)
{
double f;
int n;
f = frexp(RFLOAT_VALUE(self), &n);
f = frexp(RFLOAT_VALUE(self), n);
f = ldexp(f, DBL_MANT_DIG);
n -= DBL_MANT_DIG;
*n -= DBL_MANT_DIG;
*rf = rb_dbl2big(f);
*rn = INT2FIX(n);
}
/*
@ -2200,20 +2198,17 @@ float_decode_internal(VALUE self, VALUE *rf, VALUE *rn)
static VALUE
float_to_r(VALUE self)
{
VALUE f, n;
VALUE f;
int n;
float_decode_internal(self, &f, &n);
#if FLT_RADIX == 2
{
long ln = FIX2LONG(n);
if (ln == 0)
return rb_rational_new1(f);
if (ln > 0)
return rb_rational_new1(rb_int_lshift(f, n));
ln = -ln;
return rb_rational_new2(f, rb_int_lshift(ONE, INT2FIX(ln)));
}
if (n == 0)
return rb_rational_new1(f);
if (n > 0)
return rb_rational_new1(rb_int_lshift(f, INT2FIX(n)));
n = -n;
return rb_rational_new2(f, rb_int_lshift(ONE, INT2FIX(n)));
#else
f = rb_int_mul(f, rb_int_pow(INT2FIX(FLT_RADIX), n));
if (RB_TYPE_P(f, T_RATIONAL))
@ -2241,20 +2236,21 @@ rb_flt_rationalize_with_prec(VALUE flt, VALUE prec)
VALUE
rb_flt_rationalize(VALUE flt)
{
VALUE a, b, f, n, p, q;
VALUE a, b, f, p, q;
int n;
float_decode_internal(flt, &f, &n);
if (INT_ZERO_P(f) || FIX2INT(n) >= 0)
return rb_rational_new1(rb_int_lshift(f, n));
if (INT_ZERO_P(f) || n >= 0)
return rb_rational_new1(rb_int_lshift(f, INT2FIX(n)));
{
VALUE radix_times_f, den;
radix_times_f = rb_int_mul(INT2FIX(FLT_RADIX), f);
#if FLT_RADIX == 2 && 0
den = rb_int_lshift(ONE, INT2FIX(1-FIX2INT(n)));
den = rb_int_lshift(ONE, INT2FIX(1-n));
#else
den = rb_int_positive_pow(FLT_RADIX, 1-FIX2INT(n));
den = rb_int_positive_pow(FLT_RADIX, 1-n);
#endif
a = rb_rational_new2(rb_int_minus(radix_times_f, INT2FIX(FLT_RADIX - 1)), den);