From: "juzhe.zhong@rivai.ai" <juzhe.zhong@rivai.ai>
To: jakub <jakub@redhat.com>, jeffreyalaw <jeffreyalaw@gmail.com>,
gcc-patches <gcc-patches@gcc.gnu.org>,
kito.cheng <kito.cheng@gmail.com>, palmer <palmer@dabbelt.com>,
rguenther <rguenther@suse.de>,
richard.sandiford <richard.sandiford@arm.com>
Subject: Re: Re: [PATCH] machine_mode type size: Extend enum size from 8-bit to 16-bit
Date: Tue, 11 Apr 2023 18:11:29 +0800 [thread overview]
Message-ID: <46B896161B45EEAC+20230411181128762117223@rivai.ai> (raw)
In-Reply-To: <ZDUvf3PgXMss8pWw@tucnak>
[-- Attachment #1: Type: text/plain, Size: 1495 bytes --]
May RTX code grow faster than machine mode ?
Since RTX code grows target independent wheras
machine mode grows target dependent.
In the future, we may easily have more and more targets that some target may have a lot of machine mode.
Maybe Richard Sandiford suggestion is a good idea to fix it?
Thanks for all comments.
juzhe.zhong@rivai.ai
From: Jakub Jelinek
Date: 2023-04-11 17:59
To: juzhe.zhong; Jeff Law; gcc-patches; kito.cheng; palmer; rguenther; richard.sandiford
Subject: Re: [PATCH] machine_mode type size: Extend enum size from 8-bit to 16-bit
On Tue, Apr 11, 2023 at 10:46:25AM +0100, Richard Sandiford wrote:
> I agree with all the comments about the danger of growing the number of
> modes too much. But it looks like rtx_def should be easy to rearrange.
> Unless I'm missing something, there are less than 256 rtx codes at
> present. So one simple option would be to make the code 8 bits and
> the machine_mode 16 bits (and swap them, so that they stay well-aligned
> wrt their size).
>
> That of course would create new problem if we want more than 256 codes
> in future. But then there would be the option of a non-power-of-2
> split (12/12 or whatever). Also, it's possible to multiplex operations
> into a single code by adding an extra operand, whereas it's harder to
> multiplex modes.
We have 151 rtx codes if not a generator, 201 otherwise. That is closer to
the limit except for the RISCV proposed changes.
Jakub
next prev parent reply other threads:[~2023-04-11 10:11 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-10 14:48 juzhe.zhong
2023-04-10 14:54 ` Jeff Law
2023-04-10 15:02 ` juzhe.zhong
2023-04-10 15:14 ` juzhe.zhong
2023-04-11 9:16 ` Jakub Jelinek
2023-04-11 9:46 ` juzhe.zhong
2023-04-11 10:11 ` Jakub Jelinek
2023-04-11 10:25 ` juzhe.zhong
2023-04-11 10:52 ` Jakub Jelinek
2023-04-11 9:46 ` Richard Sandiford
2023-04-11 9:59 ` Jakub Jelinek
2023-04-11 10:11 ` juzhe.zhong [this message]
2023-04-11 10:05 ` Richard Earnshaw
2023-04-11 10:15 ` Richard Sandiford
2023-04-11 10:59 ` Richard Biener
2023-04-11 11:11 ` Richard Sandiford
2023-04-11 11:19 ` juzhe.zhong
2023-04-11 13:50 ` Kito Cheng
2023-04-12 7:53 ` Richard Biener
2023-04-12 9:06 ` Kito Cheng
2023-04-12 9:21 ` Richard Biener
2023-04-12 9:31 ` Kito Cheng
2023-04-12 23:22 ` 钟居哲
2023-04-13 13:06 ` Richard Sandiford
2023-04-13 14:02 ` Richard Biener
2023-04-15 2:58 ` Hans-Peter Nilsson
2023-04-17 6:38 ` Richard Biener
2023-04-20 5:37 ` Hans-Peter Nilsson
2023-05-05 1:43 ` Li, Pan2
2023-05-05 6:25 ` Richard Biener
2023-05-06 1:10 ` Li, Pan2
2023-05-06 1:53 ` Kito Cheng
2023-05-06 1:59 ` juzhe.zhong
2023-05-06 2:12 ` Li, Pan2
2023-05-06 2:18 ` Kito Cheng
2023-05-06 2:20 ` Li, Pan2
2023-05-06 2:48 ` Li, Pan2
2023-05-07 1:55 ` Li, Pan2
2023-05-07 15:23 ` Jeff Law
2023-05-08 1:07 ` Li, Pan2
2023-05-08 6:29 ` Richard Biener
2023-05-08 6:41 ` Li, Pan2
2023-05-08 6:59 ` Li, Pan2
2023-05-08 7:37 ` Richard Biener
2023-05-08 8:05 ` Li, Pan2
2023-05-09 6:13 ` Li, Pan2
2023-05-09 7:04 ` Richard Biener
2023-05-09 10:16 ` Richard Sandiford
2023-05-09 10:26 ` Richard Biener
2023-05-09 11:50 ` Li, Pan2
2023-05-10 5:09 ` Li, Pan2
2023-05-10 7:22 ` Li, Pan2
2023-05-08 1:35 ` Li, Pan2
2023-04-10 15:18 ` Jakub Jelinek
2023-04-10 15:22 ` juzhe.zhong
2023-04-10 20:42 ` Jeff Law
2023-04-10 23:03 ` juzhe.zhong
2023-04-11 1:36 ` juzhe.zhong
[not found] ` <20230410232205400970205@rivai.ai>
2023-04-10 15:33 ` juzhe.zhong
2023-04-10 20:39 ` Jeff Law
2023-04-10 20:36 ` Jeff Law
2023-04-10 22:53 ` juzhe.zhong
2023-04-10 15:10 ` Jakub Jelinek
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