From: Ian Lance Taylor <iant@google.com>
To: "Bingfeng Mei" <bmei@broadcom.com>
Cc: "Richard Guenther" <richard.guenther@gmail.com>,
"gcc\@gcc.gnu.org" <gcc@gcc.gnu.org>
Subject: Re: Is this correct behaviour?
Date: Tue, 06 Sep 2011 22:30:00 -0000 [thread overview]
Message-ID: <mcrk49ltibr.fsf@coign.corp.google.com> (raw)
In-Reply-To: <7FB04A5C213E9943A72EE127DB74F0ADD15FB6A5E3@SJEXCHCCR02.corp.ad.broadcom.com> (Bingfeng Mei's message of "Tue, 6 Sep 2011 08:53:51 -0700")
"Bingfeng Mei" <bmei@broadcom.com> writes:
> Then how do I tell compiler that "a" is not aliased if I have to use global variable?
>
>>
>> > Thanks,
>> > Bingfeng Mei
>> >
>> > int a;
>> > int P[100];
>> > void foo (int * restrict p)
>> > {
>> > P[0] = *p;
>> > a++;
>> > P[1] = *p;
>> > a++;
>> > P[2] = *p;
>> > a++;
>> > }
How about
int a;
int P[100];
void foo (int * restrict p)
{
foo1 (p, P, &a);
}
void foo1 (int * restrict p, int * restrict pp, int * restrict pa)
{
pp[0] = *p;
a++;
pp[1] = *p;
a++;
pp[2] = *p;
a++;
}
Ian
prev parent reply other threads:[~2011-09-06 22:30 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-06 15:31 Bingfeng Mei
2011-09-06 15:42 ` Richard Guenther
2011-09-06 15:54 ` Bingfeng Mei
2011-09-06 22:30 ` Ian Lance Taylor [this message]
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