From: Martin Sebor <msebor@gmail.com>
To: Richard Biener <richard.guenther@gmail.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>,
Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Subject: Re: [PATCH] handle bzero/bcopy in DSE and aliasing (PR 80933, 80934)
Date: Fri, 16 Jun 2017 20:52:00 -0000 [thread overview]
Message-ID: <5d3255b6-ce77-3255-5a7f-229a9dddfec7@gmail.com> (raw)
In-Reply-To: <CAFiYyc10TsqSb4or3OjkbEWSw3JZRf4HmfgcBNpg_FOrdWNqgw@mail.gmail.com>
> +static bool
> +gimple_fold_builtin_bcmp (gimple_stmt_iterator *gsi)
> +{
>
> + /* Transform bcmp (a, b, len) into memcmp (a, b, len). */
> +
> + gimple *stmt = gsi_stmt (*gsi);
> + tree a = gimple_call_arg (stmt, 0);
> + tree b = gimple_call_arg (stmt, 1);
> + tree len = gimple_call_arg (stmt, 2);
> +
> + gimple_seq seq = NULL;
> + gimple *repl = gimple_build_call (fn, 3, a, b, len);
> + gimple_seq_add_stmt_without_update (&seq, repl);
> + gsi_replace_with_seq_vops (gsi, seq);
>
> given they have the same prototype you can do like gimple_fold_builtin_stpcpy:
>
> gimple_call_set_fndecl (stmt, fn);
> fold_stmt (gsi);
>
> That works even with bcopy -> memmove if you swap arguments.
>
> Ok with that changes.
I made these changes along with those mentioned downthread and
committed r249278.
Martin
next prev parent reply other threads:[~2017-06-16 20:52 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-01 20:53 Martin Sebor
2017-06-02 11:12 ` Richard Biener
2017-06-04 15:36 ` Bernhard Reutner-Fischer
2017-06-06 16:54 ` Jeff Law
2017-06-07 3:26 ` Martin Sebor
2017-06-07 8:23 ` Richard Biener
2017-06-07 14:46 ` Martin Sebor
2017-06-07 18:37 ` Bernhard Reutner-Fischer
2017-06-07 20:01 ` Marc Glisse
2017-06-07 20:12 ` Martin Sebor
2017-06-08 2:33 ` Martin Sebor
2017-06-08 7:51 ` Richard Biener
2017-06-08 16:29 ` Martin Sebor
2017-06-09 12:35 ` Richard Biener
2017-06-09 13:04 ` Jakub Jelinek
2017-06-09 13:36 ` Richard Biener
2017-06-16 20:52 ` Martin Sebor [this message]
2017-06-07 20:23 ` Joseph Myers
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