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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41218 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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akr 2013-06-10 13:10:11 +00:00
parent e214b1b6d3
commit 780ab06a0e
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4
bignum.c
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@ -628,7 +628,9 @@ absint_numwords_generic(size_t numbytes, int nlz_bits_in_msbyte, size_t word_num
*
* This function returns ((val_numbits * CHAR_BIT + word_numbits - 1) / word_numbits)
* where val_numbits is the number of bits of abs(val).
* If it overflows, (size_t)-1 is returned.
*
* This function can overflow if _val_ is very big and word_numbits is less than CHAR_BIT.
* When overflow occur, (size_t)-1 is returned.
*
* If nlz_bits_ret is not NULL and overflow is not occur,
* (return_value * word_numbits - val_numbits) is stored in *nlz_bits_ret.