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Re: Strange conversion to int64

From: Ian Lance Taylor <iant at google dot com>
To: Tony Bernardin <sarusama at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 27 Jan 2010 14:59:11 -0800
Subject: Re: Strange conversion to int64
References: <a2eaeb241001271108v6cba4030n94b6f54d51451a09@mail.gmail.com>

Tony Bernardin <sarusama@gmail.com> writes:

> Hey, I'm having a little trouble understanding the conversion gcc is
> doing in a statement with the following types:

This question is not appropriate for the mailing list gcc@gcc.gnu.org,
which is for gcc developers.  It would be appropriate for
gcc-help@gcc.gnu.org.  Please take any followups to gcc-help.  Thanks.

> int64 = int32 * uint32

According to the rules of the C++ language, this will convert the
int32 to uint32, do a uint32 multiplication producing a uint32 result,
and then zero extend the uint32 result to assign it to int64.  This
seems consistent with the output you reported.

Ian

References:
- Strange conversion to int64
  - From: Tony Bernardin

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