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bugs in mpn_mul function

From: 游俊德
Subject: bugs in mpn_mul function
Date: Thu, 9 Sep 2004 01:59:48 +0800

Version: 4.1.3
File: mpn/generic/mul.c
Function: mpn_mul

The last line of mpn_mul function is not correct  ->  return prodp[un + vn -
un + vn - l is not the correct index of most significant limb of prodp

You can multiply two number by mpn_mul and mpn_mul_basecase separately
and compare the return value of these two functions which are different.

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