Re: [PATCH] RISC-V: avoid splitting small constant in <or_optab>i<mode>_extrabit pattern

[Jeff Law <jeffreyalaw@gmail.com>]

On 4/9/23 23:07, Lin Sinan via Gcc-patches wrote:
> From: Sinan Lin <linsinan.lsn@linux.alibaba.com>
> 
> there is no need to split an xori/ori with an small constant. take the test
> case `int foo(int idx) { return idx|3; }` as an example,
> 
> rv64im_zba generates:
>          ori     a0,a0,3
>          ret
> but, rv64im_zba_zbs generates:
>          ori     a0,a0,1
>          ori     a0,a0,2
>          ret
> 
> with this change, insn `ori r2,r1,3` will not be splitted in zbs.
As noted, this was actually a regression.  I've bootstrapped this change 
on rv64 with no regressions and pushed it to the trunk.

Thanks!

jeff