Hi, Richard and Richi.
Recently, we have some tries on our downstream RVV LLVM.
We change "get_vector_length" (same IR like GCC "select_vl") into "umin", turns out LLVM SCEV analysis succeed.
The unroll PASS works in LLVM.

I think Richard's  suggestion is very reasonable.

I didn't have the time take a look at how LLVM do now but I will take a look at it in the future. 

Thanks.


juzhe.zhong@rivai.ai
 
From: Richard Sandiford
Date: 2023-06-02 19:43
To: juzhe.zhong\@rivai.ai
CC: rguenther; gcc-patches; linkw
Subject: Re: [PATCH V3] VECT: Change flow of decrement IV
"juzhe.zhong@rivai.ai" <juzhe.zhong@rivai.ai> writes:
> Thanks Richi. I am gonna merge it after Richard's final approve.
 
Thanks for checking, but no need to wait for a second ack from me!
Please go ahead and commit.
 
Richard