Date: 2023-12-14 20:50
To: juzhe.zh...@rivai.ai
CC: gcc-patches; richard.sandiford; jeffreyalaw
Subject: Re: Re: [PATCH] Middle-end: Adjust decrement IV style partial
vectorization COST model
On Thu, 14 Dec 2023, juzhe.zh...@rivai.ai wrote:
> Thanks Richard.
>
> Let me clarify agai
1 is better for
> using SELECT_VL.
>
> We are not modeling address cost, so trying to account for this here is only
> going to be a heuristic that?s as many times wrong than it is correct. If
> the difference between SELECT_VL and not is so small then you?ll have a hard
>
is better than COST=2.
Thanks.
juzhe.zh...@rivai.ai
From: Richard Biener
Date: 2023-12-14 18:46
To: juzhe.zhong
CC: gcc-patches; richard.sandiford; jeffreyalaw
Subject: Re: [PATCH] Middle-end: Adjust decrement IV style partial
vectorization COST model
Am 14.12.2023 um 09:28 schrieb
Am 14.12.2023 um 09:28 schrieb juzhe.zh...@rivai.ai:
Hi, Richard.I have a question about the decrement IV costing since I find the reduction case is generating inferior codegen.reduc_plus_int: mv a3,a0 ble a1,zero,.L7 addiw a5,a1,-1 li a4,2 bleu a5,a4,.L8 vsetivli zero,4,e32,m1,ta,ma srliw
ion is the COST should be 1 or 2.
It seems that COST = 1 is better for using SELECT_VL.
Thanks.
juzhe.zh...@rivai.ai
From: Richard Biener
Date: 2023-12-13 18:17
To: Juzhe-Zhong
CC: gcc-patches; richard.sandiford; jeffreyalaw
Subject: Re: [PATCH] Middle-end: Adjust decrement IV style partial
On Wed, 13 Dec 2023, Juzhe-Zhong wrote:
> Hi, before this patch, a simple conversion case for RVV codegen:
>
> foo:
> ble a2,zero,.L8
> addiw a5,a2,-1
> li a4,6
> bleua5,a4,.L6
> srliw a3,a2,3
> sllia3,a3,3
> add
