ruby-changes:19119
From: nobu <ko1@a...>
Date: Wed, 23 Mar 2011 08:27:57 +0900 (JST)
Subject: [ruby-changes:19119] Ruby:r31158 (trunk): * numeric.c (flo_round): fix inaccurate results.
nobu 2011-03-23 08:07:36 +0900 (Wed, 23 Mar 2011) New Revision: 31158 http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=31158 Log: * numeric.c (flo_round): fix inaccurate results. Modified files: trunk/ChangeLog trunk/include/ruby/intern.h trunk/numeric.c trunk/test/ruby/test_float.rb Index: include/ruby/intern.h =================================================================== --- include/ruby/intern.h (revision 31157) +++ include/ruby/intern.h (revision 31158) @@ -126,6 +126,7 @@ VALUE rb_big_minus(VALUE, VALUE); VALUE rb_big_mul(VALUE, VALUE); VALUE rb_big_div(VALUE, VALUE); +VALUE rb_big_idiv(VALUE, VALUE); VALUE rb_big_modulo(VALUE, VALUE); VALUE rb_big_divmod(VALUE, VALUE); VALUE rb_big_pow(VALUE, VALUE); Index: ChangeLog =================================================================== --- ChangeLog (revision 31157) +++ ChangeLog (revision 31158) @@ -1,3 +1,7 @@ +Wed Mar 23 08:07:33 2011 Nobuyoshi Nakada <nobu@r...> + + * numeric.c (flo_round): fix inaccurate results. + Wed Mar 23 00:12:16 2011 Tajima Akio <artonx@y...> * win32/win32.c: wait process real termination after reading Index: numeric.c =================================================================== --- numeric.c (revision 31157) +++ numeric.c (revision 31158) @@ -97,6 +97,9 @@ } #endif +static VALUE fix_mul(VALUE x, VALUE y); +static VALUE int_pow(long x, unsigned long y); + static ID id_coerce, id_to_i, id_eq; VALUE rb_cNumeric; @@ -1492,7 +1495,15 @@ if (ndigits < 0) number = 0; } else { - if (ndigits < 0) number /= f; + if (ndigits < 0) { + if (fabs(number) < f) return INT2FIX(0); + if (!FIXABLE(number)) { + VALUE f10 = int_pow(10, -ndigits); + num = rb_big_idiv(rb_dbl2big(number), f10); + return FIXNUM_P(num) ? fix_mul(num, f10) : rb_big_mul(num, f10); + } + number /= f; + } else number *= f; number = round(number); if (ndigits < 0) number *= f; Index: test/ruby/test_float.rb =================================================================== --- test/ruby/test_float.rb (revision 31157) +++ test/ruby/test_float.rb (revision 31158) @@ -320,6 +320,8 @@ assert_equal(1.110, 1.111.round(2)) assert_equal(11110.0, 11111.1.round(-1)) assert_equal(11100.0, 11111.1.round(-2)) + + assert_equal(10**300, 1.1e300.round(-300)) end VS = [ -- ML: ruby-changes@q... Info: http://www.atdot.net/~ko1/quickml/