egen.
Could you take a look at it:
V15 patch:
https://gcc.gnu.org/pipermail/gcc-patches/2023-May/619534.html
Thanks.
juzhe.zh...@rivai.ai
From: Richard Sandiford
Date: 2023-05-25 04:05
To: 钟居哲
CC: gcc-patches; rguenther
Subject: Re: [PATCH V14] VECT: Add decrement IV iteration loop control by
variab
I'll look at the samples tomorrow, but just to address one thing:
钟居哲 writes:
>>> What gives the best code in these cases? Is emitting a multiplication
>>> better? Or is using a new IV better?
> Could you give me more detail information about "new refresh IV" approach.
> I'd like to try that.
try that.
Thanks.
juzhe.zh...@rivai.ai
From: Richard Sandiford
Date: 2023-05-25 00:00
To: 钟居哲
CC: gcc-patches; rguenther
Subject: Re: [PATCH V14] VECT: Add decrement IV iteration loop control by
variable amount support
钟居哲 writes:
> Oh. I see. Thank you so much for pointing this.
> Could
?
juzhe.zh...@rivai.ai
From: Richard Sandiford
Date: 2023-05-25 00:00
To: 钟居哲
CC: gcc-patches; rguenther
Subject: Re: [PATCH V14] VECT: Add decrement IV iteration loop control by
variable amount support
钟居哲 writes:
> Oh. I see. Thank you so much for pointing this.
> Could you tell me wha
钟居哲 writes:
> Oh. I see. Thank you so much for pointing this.
> Could you tell me what I should do in the codes?
> It seems that I should adjust it in
> vect_adjust_loop_lens_control
>
> muliply by some factor ? Is this correct multiply by max_nscalars_per_iter
> ?
max_nscalars_per_iter * factor
Date: 2023-05-24 23:47
To: 钟居哲
CC: gcc-patches; rguenther
Subject: Re: [PATCH V14] VECT: Add decrement IV iteration loop control by
variable amount support
钟居哲 writes:
> Hi, Richard. I still don't understand it. Sorry about that.
>
>>> loop_len_48 = MIN_EXPR ;
> >
钟居哲 writes:
> Hi, Richard. I still don't understand it. Sorry about that.
>
>>> loop_len_48 = MIN_EXPR ;
> >> _74 = loop_len_34 * 2 - loop_len_48;
>
> I have the tests already tested.
> We have a MIN_EXPR to calculate the total elements:
> loop_len_34 = MIN_EXPR ;
> I think "8" is already mul
ate: 2023-05-24 23:31
To: 钟居哲
CC: gcc-patches; rguenther
Subject: Re: [PATCH V14] VECT: Add decrement IV iteration loop control by
variable amount support
钟居哲 writes:
> Hi, the .optimized dump is like this:
>
>[local count: 21045336]:
> ivtmp.26_36 = (unsigned long) &x;
>
MIN_EXPR <_75, 4>;
loop_len_51 = _75 - loop_len_50;
It seems to work. I wonder why we need multiplication ?
Thanks.
juzhe.zh...@rivai.ai
发件人： 钟居哲
发送时间： 2023-05-24 23:13
收件人： richard.sandiford
抄送： gcc-patches; rguenther
主题： Re: Re: [PATCH V14] VECT: Add decrement IV iteration loop control by
钟居哲 writes:
> Hi, the .optimized dump is like this:
>
>[local count: 21045336]:
> ivtmp.26_36 = (unsigned long) &x;
> ivtmp.27_3 = (unsigned long) &y;
> ivtmp.30_6 = (unsigned long) &MEM [(void *)&y + 16B];
> ivtmp.31_10 = (unsigned long) &MEM [(void *)&y + 32B];
> ivtmp.32_14 = (u
: juzhe.zhong
CC: gcc-patches; rguenther
Subject: Re: [PATCH V14] VECT: Add decrement IV iteration loop control by
variable amount support
Thanks for trying it. I'm still surprised that no multiplication
is needed though. Does the patch work for:
short x[100];
int y[200];
void f() {
for (in
Thanks for trying it. I'm still surprised that no multiplication
is needed though. Does the patch work for:
short x[100];
int y[200];
void f() {
for (int i = 0, j = 0; i < 100; i += 2, j += 4) {
x[i + 0] += 1;
x[i + 1] += 2;
y[j + 0] += 1;
y[j + 1] += 2;
y[j + 2] += 3;
From: Ju-Zhe Zhong
This patch is supporting decrement IV by following the flow designed by Richard:
(1) In vect_set_loop_condition_partial_vectors, for the first iteration of:
call vect_set_loop_controls_directly.
(2) vect_set_loop_controls_directly calculates "step" as in your patch.
If rg
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