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[ruby/bigdecimal] Fix the maximum precision of the quotient

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Fixes https://github.com/ruby/bigdecimal/pull/220

https://github.com/ruby/bigdecimal/commit/127a1b5a31
This commit is contained in:
Kenta Murata 2022-01-19 15:53:36 +09:00
parent 506728d0b8
commit 7db195d521
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2 changed files with 14 additions and 8 deletions
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15
ext/bigdecimal/bigdecimal.c
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@ -1647,18 +1647,16 @@ BigDecimal_divide(VALUE self, VALUE r, Real **c, Real **res, Real **div)
SAVE(b);
*div = b;
mx = (a->Prec > b->Prec) ? a->Prec : b->Prec;
mx *= BASE_FIG;
BigDecimal_count_precision_and_scale(self, &a_prec, NULL);
BigDecimal_count_precision_and_scale(rr, &b_prec, NULL);
mx = (a_prec > b_prec) ? a_prec : b_prec;
mx *= 2;
if (2*BIGDECIMAL_DOUBLE_FIGURES > mx)
mx = 2*BIGDECIMAL_DOUBLE_FIGURES;
GUARD_OBJ((*c), VpCreateRbObject(mx + 2*BASE_FIG, "#0", true));
GUARD_OBJ((*res), VpCreateRbObject(mx*2 + 2*BASE_FIG, "#0", true));
GUARD_OBJ((*res), VpCreateRbObject((mx + 1)*2 + 2*BASE_FIG, "#0", true));
VpDivd(*c, *res, a, b);
return Qnil;
@ -1808,6 +1806,8 @@ BigDecimal_DoDivmod(VALUE self, VALUE r, Real **div, Real **mod)
BigDecimal_count_precision_and_scale(rr, &b_prec, NULL);
mx = (a_prec > b_prec) ? a_prec : b_prec;
mx *= 2;
if (2*BIGDECIMAL_DOUBLE_FIGURES > mx)
mx = 2*BIGDECIMAL_DOUBLE_FIGURES;
@ -5931,18 +5931,17 @@ VpDivd(Real *c, Real *r, Real *a, Real *b)
word_c = c->MaxPrec;
word_r = r->MaxPrec;
ind_c = 0;
ind_r = 1;
if (word_a >= word_r) goto space_error;
ind_r = 1;
r->frac[0] = 0;
while (ind_r <= word_a) {
r->frac[ind_r] = a->frac[ind_r - 1];
++ind_r;
}
while (ind_r < word_r) r->frac[ind_r++] = 0;
ind_c = 0;
while (ind_c < word_c) c->frac[ind_c++] = 0;
/* initial procedure */

7
test/bigdecimal/test_bigdecimal.rb
View file

@ -973,6 +973,13 @@ class TestBigDecimal < Test::Unit::TestCase
assert_raise_with_message(FloatDomainError, "Computation results in '-Infinity'") { BigDecimal("-1") / 0 }
end
def test_div_gh220
x = BigDecimal("1.0")
y = BigDecimal("3672577333.6608990499165058135986328125")
c = BigDecimal("0.272288343892592687909520102748926752911779209181321744700032723729015151607289998e-9")
assert_equal(c, x / y, "[GH-220]")
end
def test_div_precision
bug13754 = '[ruby-core:82107] [Bug #13754]'
a = BigDecimal('101')