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Re: [PATCH v5 57/60] target/riscv: vector slide instructions

From: Richard Henderson
Subject: Re: [PATCH v5 57/60] target/riscv: vector slide instructions
Date: Tue, 24 Mar 2020 07:52:06 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 3/24/20 3:51 AM, LIU Zhiwei wrote:
>> (3) It would be handy to have TCGv cpu_vl.
> Do you mean I should define cpu_vl as a global TCG varible like cpu_pc?
> So that I can check vl==0 in translation time.


>> vslide1up.vx:
>>      Ho hum, I forgot about masking.  Some options:
>>      (1) Call a helper just as you did in your original patch.
>>      (2) Call a helper only for !vm, for vm as below.
> Sorry, I don't get it why I need a helper for !vm.
> I think I can  call vslideup w/1 whether !vm or vm, then a store to vd[0].

That's right.  I didn't mean a helper specific to vslide1up, but any helper.


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