t's more comprehensive than I wrote.
I will send V3 patch with appending your comments.
Thanks you so much!
juzhe.zh...@rivai.ai
From: Richard Sandiford
Date: 2023-06-05 18:09
To: juzhe.zhong\@rivai.ai
CC: gcc-patches; rguenther
Subject: Re: [PATCH V2] VECT: Add SELECT_VL support
"juz
"juzhe.zh...@rivai.ai" writes:
> Hi, Richard.
>
>>> No, I meant that the comment I quoted seemed to be saying that solution
>>> 3 wasn't possible. The comment seemed to say that we would need to do
>>> solution 1.
> I am so sorry that I didn't write the comments accurately.
> Could you help me wi
n "vsetvli "?
"vsetvli zero" is the same cost as "vsetvli gpr",
I think for (b), solution 2 and solution 3 should be almost the same.
juzhe.zh...@rivai.ai
From: Richard Sandiford
Date: 2023-06-05 15:57
To: juzhe.zhong\@rivai.ai
CC: gcc-patches; rguenth
Richard Sandiford writes:
> "juzhe.zh...@rivai.ai" writes:
>> Hi, Richard. Thanks for the comments.
>>
If we use SELECT_VL to refer only to the target-independent ifn, I don't
see why this last bit is true.
>> Could you give me more details and information about this since I am not
>>
"juzhe.zh...@rivai.ai" writes:
> Hi, Richard. Thanks for the comments.
>
>>> If we use SELECT_VL to refer only to the target-independent ifn, I don't
>>> see why this last bit is true.
> Could you give me more details and information about this since I am not sure
> whether I catch up with you.
flow of single-rgoup:
...
length = min (vf)
...
vsetvli zero. length <=== insert by VSETLVI PASS
load (pointer IV)
vadd.
...
pointer IV = pointer IV + VF
I want to optimize it into:
...
length = vsetvli (Vf)
... <=== not need to insert vsetvlli.
load (pointer IV)
vadd.
...
pointer IV =
juzhe.zh...@rivai.ai writes:
> + /* If we're using decrement IV approach in loop control, we can use output
> of
> + SELECT_VL to adjust IV of loop control and data reference when it
> satisfies
> + the following checks:
> +
> + (a) SELECT_VL is supported by the target.
> + (b) L
From: Ju-Zhe Zhong
This patch address comments from Richard and rebase to trunk.
This patch is adding SELECT_VL middle-end support
allow target have target dependent optimization in case of
length calculation.
This patch is inspired by RVV ISA and LLVM:
https://reviews.llvm.org/D99750
The SELE
