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range.c: fix fixnum loop condition

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* range.c (range_step): FIXABLE + FIXABLE never overflow, but may
  not be FIXABLE.  [Feature #12912]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63207 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2018-04-20 00:10:46 +00:00
parent 5a5c9a706c
commit ad5a6aa790
2 changed files with 9 additions and 4 deletions
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7
range.c
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@ -402,11 +402,10 @@ range_step(int argc, VALUE *argv, VALUE range)
if (FIXNUM_P(b) && NIL_P(e) && FIXNUM_P(step)) {
long i = FIX2LONG(b), unit = FIX2LONG(step);
while (1) {
do {
rb_yield(LONG2FIX(i));
if (i + unit < i) break;
i += unit;
}
i += unit; /* FIXABLE+FIXABLE never overflow */
} while (FIXABLE(i));
b = LONG2NUM(i);
for (;; b = rb_funcallv(b, id_succ, 0, 0))