Committed after the commited of the vsetvl pass refactor patch, thanks
Robin.
On 2023/10/19 16:43, Robin Dapp wrote:
Hi Juzhe,
as discussed off-list this approach generally makes sense to me so
the patch LGTM once the vsetvl rework is upstream and settled.
Independently, we still need to
instructions are considered as very cheap (COST = 1).
juzhe.zh...@rivai.ai
From: Robin Dapp
Date: 2023-10-19 16:43
To: Juzhe-Zhong; gcc-patches
CC: rdapp.gcc; kito.cheng; kito.cheng; jeffreyalaw
Subject: Re: [PATCH V2] RISC-V: Fix failed hoist in LICM of vmv.v.x instruction
Hi Juzhe,
as discussed off
Hi Juzhe,
as discussed off-list this approach generally makes sense to me so
the patch LGTM once the vsetvl rework is upstream and settled.
Independently, we still need to understand why the more complex
broadcast pattern is not hoisted out of the loop.
Regards
Robin
-10-18 18:25
To: gcc-patches
CC: kito.cheng; kito.cheng; jeffreyalaw; rdapp.gcc; Juzhe-Zhong
Subject: [PATCH V2] RISC-V: Fix failed hoist in LICM of vmv.v.x instruction
Confirm dynamic LMUL algorithm works well for choosing LMUL = 4 for the PR:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111848
Confirm dynamic LMUL algorithm works well for choosing LMUL = 4 for the PR:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111848
But it generate horrible register spillings.
The root cause is that we didn't hoist the vmv.v.x outside the loop which
increase the SLP loop register pressure.
So,
