RFR: 8301628: RISC-V: c2 fix pipeline class for several instructions [v2]

[Gui Cao]

On Thu, 2 Feb 2023 02:58:51 GMT, Gui Cao <gcao at openjdk.org> wrote:

>> HI,
>> 
>> The current C2 instructions can use some more accurate ins_pipe, eg.:
>> 
>> instruct regI_not_reg(iRegINoSp dst, iRegI src1, immI_M1 m1) %{
>>   match(Set dst (XorI src1 m1));
>>   ins_cost(ALU_COST);
>>   format %{ "xori  $dst, $src1, -1\t#@regI_not_reg" %}
>> 
>>   ins_encode %{
>>     __ xori(as_Register($dst$$reg), as_Register($src1$$reg), -1);
>>   %}
>> 
>>   ins_pipe(ialu_reg);
>> %}
>> 
>> 
>> We can use the more accurate pipe_class `ialu_reg_imm` instead.
>> 
>> Please take a look and have some reviews. Thanks a lot.
>> 
>> ## Testing:
>> - hotspot and jdk tier1 on unmatched board without new failures
>
> Gui Cao has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix typo error

Thanks all for the review.

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PR: https://git.openjdk.org/jdk/pull/12379