> -----Original Message-----
> From: Andrew Pinski [mailto:pinskia@gcc.gnu.org]
> Sent: Saturday, November 5, 2022 2:34 PM
> To: Zhongyunde <zhongyunde@huawei.com>
> Cc: hongtao.liu@intel.com; gcc-patches@gcc.gnu.org; Zhangwen(Esan)
> <zwzhangwen.zhang@huawei.com>; Weiwei (weiwei, Compiler)
> <weiwei64@huawei.com>; zhong_1985624@163.com
> Subject: Re: [PATCH] [PHIOPT] Add A ? B + CST : B match and simplify
> optimizations
> 
> On Fri, Nov 4, 2022 at 11:17 PM Zhongyunde <zhongyunde@huawei.com>
> wrote:
> >
> > hi,
> >   This patch is try to fix the issue
> > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107190,
> > would you like to give me some suggestion, thanks.
> 
> This seems like a "simplified" version of
> https://gcc.gnu.org/pipermail/gcc-patches/2021-November/584411.html
> which just handles power of 2 constants where we know the cond will be
> removed.
> We could do even more "simplified" of 1 if needed really.
> What is the IR before PHI-OPT? Is it just + 1?

Thanks for your attention. It is + 4294967296 before PHI-OPT  (See detail https://gcc.godbolt.org/z/6zEc6ja1z)
So we should keep matching the power of 2 constants ?

> Also your pattern can be simplified to use integer_pow2p in the match part
> instead of INTEGER_CST.
> 
Apply your comment, thanks

> Thanks,
> Andrew