From: Richard Henderson <rth@redhat.com>
To: Bernd Schmidt <bernds@codesourcery.com>
Cc: GCC Patches <gcc-patches@gcc.gnu.org>
Subject: Re: Add __builtin_clrsb, similar to clz/ctz
Date: Mon, 20 Jun 2011 20:48:00 -0000 [thread overview]
Message-ID: <4DFFA971.4070206@redhat.com> (raw)
In-Reply-To: <4DFFA1AE.7070405@codesourcery.com>
On 06/20/2011 12:38 PM, Bernd Schmidt wrote:
> D'oh. Blackfin has a (clrsb:HI (operand:SI)) instruction, so adding this
> showed a problem with some of the existing simplify_const_unop cases:
> for ffs/clz/ctz/clrsb/parity/popcount, we should look at the mode of the
> operand, rather than the mode of the operation. This limits what we can
> do in that function, since op_mode is sometimes VOIDmode - we really
> should add builtin folders for these at some point.
>
> New patch below. Retested on i686 and bfin.
>
Ok.
I'm not going to bike-shed the function name. If, at some point
before 4.7 is released we agree on another name, we can change it.
r~
next prev parent reply other threads:[~2011-06-20 20:12 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-16 13:06 Bernd Schmidt
2011-06-16 13:10 ` Georg-Johann Lay
2011-06-16 13:56 ` Laurent Desnogues
2011-06-16 13:59 ` Bernd Schmidt
2011-06-16 17:03 ` Richard Henderson
2011-06-20 20:32 ` Bernd Schmidt
2011-06-20 20:48 ` Richard Henderson [this message]
2011-06-21 16:39 ` [PATCH] Fix __bultin_clrsb* (PR middle-end/49489) Jakub Jelinek
2011-06-21 16:46 ` Bernd Schmidt
2011-06-23 6:23 ` Add __builtin_clrsb, similar to clz/ctz H.J. Lu
2011-07-12 3:50 ` Hans-Peter Nilsson
2011-08-23 10:07 ` Jakub Jelinek
2011-08-23 10:08 ` Bernd Schmidt
2011-08-23 10:19 ` Richard Guenther
2011-08-23 10:25 ` Jakub Jelinek
2011-08-23 10:34 ` Bernd Schmidt
2011-08-23 13:43 ` [PATCH] For FFS/CLZ/CTZ/CLRSB/POPCOUNT/PARITY/BSWAP require operand mode equal to operation mode (or VOIDmode) (PR middle-end/50161) Jakub Jelinek
2011-08-23 14:54 ` Georg-Johann Lay
2011-08-23 15:58 ` Jakub Jelinek
2011-08-23 16:16 ` Bernd Schmidt
2011-08-23 10:45 ` Add __builtin_clrsb, similar to clz/ctz Richard Sandiford
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