From: Segher Boessenkool <segher@kernel.crashing.org>
To: Richard Biener <richard.guenther@gmail.com>
Cc: "Martin Liška" <mliska@suse.cz>,
"GCC Patches" <gcc-patches@gcc.gnu.org>,
"Richard Sandiford" <richard.sandiford@arm.com>
Subject: Re: [stage1][PATCH] Lower VEC_COND_EXPR into internal functions.
Date: Fri, 29 May 2020 10:39:33 -0500 [thread overview]
Message-ID: <20200529153933.GW31009@gate.crashing.org> (raw)
In-Reply-To: <CAFiYyc1X5VH=aWyYwaF8HMxUXOfA_b2jzc=8kH+GkQ-xkgASjw@mail.gmail.com>
On Fri, May 29, 2020 at 02:17:00PM +0200, Richard Biener wrote:
> Now it looks like that those verification also simply checks optab
> availability only but then this is just a preexisting issue (and we can
> possibly build a testcase that FAILs RTL expansion for power...).
>
> So given that this means the latent bug in the powerpc backend
> should be fixed and we should use a direct internal function instead?
I don't see what you consider a bug in the backend here? The expansion
FAILs, and it is explicitly allowed to do that.
Not allowed to FAIL are:
-- The "lanes" things;
-- vec_duplicate, vec_series;
-- maskload, maskstore;
-- fmin, fmax;
-- madd and friends;
-- sqrt, rsqrt;
-- fmod, remainder;
-- scalb, ldexp;
-- sin, cos, tan, asin, acos, atan;
-- exp, expm1, exp10, exp2, log, log1p, log10, log2, logb;
-- significand, pow, atan2, floor, btrunc, round, ceil, nearbyint, rint;
-- copysign, xorsign;
-- ffs, clrsb, clz, ctz, popcount, parity.
All vcond* patterns are allowed to fail.
Maybe ours don't *need* to, but that doesn't change a thing.
In general, it is a Very Good Thing if patterns are allowed to fail: if
they are not allowed to fail, they have to duplicate all the code that
the generic expander should have, into ever target that needs it. It
also makes writing a (new) backend easier.
Segher
next prev parent reply other threads:[~2020-05-29 15:39 UTC|newest]
Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-24 10:25 [PATCH][RFC] Come up with VEC_COND_OP_EXPRs Martin Liška
2019-09-24 11:11 ` Richard Sandiford
2019-09-24 11:29 ` Richard Biener
2019-09-24 11:57 ` Richard Sandiford
2019-09-24 12:18 ` Richard Biener
2019-09-24 14:51 ` Richard Sandiford
2020-04-01 10:19 ` [stage1][PATCH] Lower VEC_COND_EXPR into internal functions Martin Liška
2020-04-06 9:17 ` Richard Sandiford
2020-04-06 12:30 ` Richard Biener
2020-05-21 12:51 ` Martin Liška
2020-05-21 13:29 ` Martin Liška
2020-05-21 20:16 ` Segher Boessenkool
2020-05-22 11:14 ` Richard Biener
2020-05-26 10:15 ` Richard Sandiford
2020-05-27 14:04 ` Martin Liška
2020-05-27 16:13 ` Richard Sandiford
2020-05-27 16:32 ` Richard Biener
2020-05-28 14:46 ` Martin Liška
2020-05-28 15:28 ` Richard Sandiford
2020-05-29 12:17 ` Richard Biener
2020-05-29 12:43 ` Richard Biener
2020-05-29 16:47 ` Segher Boessenkool
2020-05-29 17:05 ` Richard Sandiford
2020-05-29 17:30 ` Segher Boessenkool
2020-05-29 15:39 ` Segher Boessenkool [this message]
2020-05-29 16:57 ` Richard Sandiford
2020-05-29 17:09 ` Segher Boessenkool
2020-05-29 17:26 ` Richard Sandiford
2020-05-29 17:37 ` Segher Boessenkool
2020-05-30 7:15 ` Richard Sandiford
2020-05-30 13:08 ` Segher Boessenkool
2020-06-02 11:09 ` Richard Biener
2020-06-02 15:00 ` Martin Liška
2020-06-03 7:38 ` Richard Biener
2020-06-03 13:41 ` Richard Sandiford
2020-06-03 14:17 ` David Edelsohn
2020-06-03 14:46 ` Richard Biener
2020-06-03 17:01 ` Segher Boessenkool
2020-06-03 17:23 ` Richard Biener
2020-06-03 18:23 ` Segher Boessenkool
2020-06-03 18:38 ` Richard Biener
2020-06-03 18:46 ` David Edelsohn
2020-06-03 19:09 ` Segher Boessenkool
2020-06-03 19:13 ` Jakub Jelinek
2020-06-03 18:27 ` Segher Boessenkool
2020-06-08 11:04 ` Martin Liška
2020-06-09 13:42 ` Richard Biener
2020-06-10 8:51 ` Martin Liška
2020-06-10 10:50 ` Richard Biener
2020-06-10 12:27 ` Martin Liška
2020-06-10 13:01 ` Martin Liška
2020-06-11 8:52 ` Martin Liška
2020-06-12 9:43 ` Richard Biener
2020-06-12 13:24 ` Martin Liška
2020-06-15 7:14 ` Richard Biener
2020-06-15 11:19 ` Martin Liška
2020-06-15 11:59 ` Richard Biener
2020-06-15 12:20 ` Martin Liška
2020-06-17 8:50 ` Richard Biener
2020-06-17 13:15 ` Richard Biener
2020-06-18 8:10 ` Martin Liška
2020-06-18 8:52 ` Richard Biener
2020-06-18 9:02 ` Martin Liška
2020-06-18 9:29 ` Martin Liška
2020-04-06 12:33 ` Richard Biener
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200529153933.GW31009@gate.crashing.org \
--to=segher@kernel.crashing.org \
--cc=gcc-patches@gcc.gnu.org \
--cc=mliska@suse.cz \
--cc=richard.guenther@gmail.com \
--cc=richard.sandiford@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).