diff options
| -rw-r--r-- | bignum.c | 3 | ||||
| -rw-r--r-- | test/ruby/test_integer.rb | 12 |
2 files changed, 15 insertions, 0 deletions
@@ -6824,6 +6824,9 @@ estimate_initial_sqrt(VALUE *xp, const size_t xn, const BDIGIT *nds, size_t len) if (lowbits || (lowbits = !bary_zero_p(nds, len-dbl_per_bdig))) ++d; } + else { + lowbits = 1; + } rshift /= 2; rshift += (2-(len&1))*BITSPERDIG/2; if (rshift >= 0) { diff --git a/test/ruby/test_integer.rb b/test/ruby/test_integer.rb index e0927c9ffe..963c6b75a4 100644 --- a/test/ruby/test_integer.rb +++ b/test/ruby/test_integer.rb @@ -488,5 +488,17 @@ class TestInteger < Test::Unit::TestCase assert_equal(exact, Integer.sqrt(x+1), "10**#{i}+1") assert_equal(exact-1, Integer.sqrt(x-1), "10**#{i}-1") end + + bug13440 = '[ruby-core:80696] [Bug #13440]' + too_big = [] + too_small = [] + 0.step(to: 50, by: 0.001) do |i| + n = (10**i).to_i + int_root = Integer.sqrt(n) + too_big << n if int_root*int_root > n + too_small << n if (int_root+1)*(int_root+1) <= n + end + assert_empty(too_big, bug13440) + assert_empty(too_small, bug13440) end end |