From: Richard Henderson <rth@redhat.com>
To: Georg-Johann Lay <avr@gjlay.de>
Cc: "Joseph S. Myers" <joseph@codesourcery.com>,
gcc-patches@gcc.gnu.org,
Denis Chertykov <chertykov@gmail.com>,
Anatoly Sokolov <aesok@post.ru>,
"Eric B. Weddington" <eric.weddington@atmel.com>
Subject: Re: [Patch, AVR]: QI builtins for parity, popcount, 1<< n
Date: Mon, 20 Jun 2011 15:39:00 -0000 [thread overview]
Message-ID: <4DFF6903.4060508@redhat.com> (raw)
In-Reply-To: <4DFF573D.2000807@gjlay.de>
On 06/20/2011 07:20 AM, Georg-Johann Lay wrote:
> A libcall could be added in TARGET_INIT_LIBCALLS, so a new hook is not
> needed. All that's needed is that optabs tests for presence of such
> an entry and prefers it over inline expansion (and prefers insn over
> libcall). It appears that + and - are assumed to be cheaps or inline
> expansion is always cheap.
No, we assume that if the inline pattern is present and enabled, it
is to be preferred over the libcall. All you have to do to get
__adddi3 called is remove/disable the adddi3 pattern.
r~
next prev parent reply other threads:[~2011-06-20 15:37 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-16 16:08 Georg-Johann Lay
2011-06-16 17:08 ` Joseph S. Myers
2011-06-17 11:04 ` Georg-Johann Lay
2011-06-17 13:06 ` Joseph S. Myers
2011-06-17 19:03 ` Georg-Johann Lay
2011-06-17 19:14 ` Georg-Johann Lay
2011-06-20 10:53 ` Joseph S. Myers
2011-06-20 14:31 ` Georg-Johann Lay
2011-06-20 15:39 ` Richard Henderson [this message]
2011-06-20 16:52 ` Georg-Johann Lay
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