From: 钟居哲 <juzhe.zhong@rivai.ai>
To: richard.sandiford <richard.sandiford@arm.com>
Cc: gcc-patches <gcc-patches@gcc.gnu.org>, rguenther <rguenther@suse.de>
Subject: Re: Re: [PATCH V4] VECT: Add decrement IV iteration loop control by variable amount support
Date: Fri, 12 May 2023 07:12:29 +0800 [thread overview]
Message-ID: <8A5962994498B181+202305120712292922163@rivai.ai> (raw)
In-Reply-To: <mptednnf398.fsf@arm.com>
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Hi, Richards.
Could you take a look at this patch:
https://gcc.gnu.org/pipermail/gcc-patches/2023-May/618241.html
Thanks
juzhe.zhong@rivai.ai
From: Richard Sandiford
Date: 2023-05-11 20:42
To: juzhe.zhong\@rivai.ai
CC: gcc-patches; rguenther
Subject: Re: [PATCH V4] VECT: Add decrement IV iteration loop control by variable amount support
"juzhe.zhong@rivai.ai" <juzhe.zhong@rivai.ai> writes:
> Thanks. I have read rgroup descriptions again.
> Still I am not fully understand it clearly, bear with me :)
>
> I don't known how to differentiate Case 2 and Case 3.
>
> Case 2 is multiple rgroup for SLP.
> Case 3 is multiple rgroup for non-SLP (VEC_PACK_TRUNC)
>
> Is it correct:
> case 2: rgc->max_nscalarper_iter != 1
Yes.
> Case 3 : rgc->max_nscalarper_iter == 1 but rgc->factor != 1?
For case 3 it's:
rgc->max_nscalars_per_iter == 1 && rgc != &LOOP_VINFO_LENS (loop_vinfo)[0]
rgc->factor is controlled by the target and just says what units
IFN_LOAD_LEN works in. E.g. if we're loading 16-byte elements,
but the underlying instruction measures bytes, the factor would be 2.
Thanks,
Richard
prev parent reply other threads:[~2023-05-11 23:12 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-04 13:25 juzhe.zhong
2023-05-05 23:41 ` 钟居哲
2023-05-09 12:59 ` Richard Sandiford
2023-05-09 13:27 ` juzhe.zhong
2023-05-09 14:34 ` 钟居哲
2023-05-07 15:19 ` Jeff Law
2023-05-07 21:54 ` 钟居哲
2023-05-09 10:52 ` juzhe.zhong
2023-05-08 5:35 ` Kewen.Lin
2023-05-08 6:27 ` juzhe.zhong
2023-05-08 7:55 ` Kewen.Lin
2023-05-08 8:25 ` juzhe.zhong
2023-05-10 16:45 ` Richard Sandiford
2023-05-10 21:00 ` 钟居哲
2023-05-10 21:28 ` Richard Sandiford
2023-05-10 22:51 ` 钟居哲
2023-05-11 4:50 ` Richard Sandiford
2023-05-11 5:14 ` juzhe.zhong
2023-05-11 10:11 ` juzhe.zhong
2023-05-11 11:04 ` Richard Sandiford
2023-05-11 11:21 ` juzhe.zhong
2023-05-11 11:29 ` Richard Sandiford
2023-05-11 12:08 ` juzhe.zhong
2023-05-11 12:42 ` Richard Sandiford
2023-05-11 23:12 ` 钟居哲 [this message]
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