RFR: 8332442: C2: refactor Mod cases in Compile::final_graph_reshaping_main_switch() [v2]

[Kangcheng Xu]

On Mon, 9 Sep 2024 11:46:20 GMT, Roland Westrelin <roland at openjdk.org> wrote:

>> Kangcheng Xu has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   remove redundant arguments, test with -XX:-UseDivMod
>
> src/hotspot/share/opto/compile.cpp line 3174:
> 
>> 3172:   }
>> 3173: 
>> 3174:   BasicType bt = div_op == Op_DivI || div_op == Op_UDivI ? T_INT : T_LONG;
> 
> and add a new function `Op_DivMod(BasicType bt, bool is_unsigned)` similar to `Op_ConIL` that would replace `div_mod_op` here.

Added new function `Op_DivModIL(...)` as `Op_DivMod` already exists as an opcode constant and cannot be removed without significant changes to the codebase (although never referenced directly).

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PR Review Comment: https://git.openjdk.org/jdk/pull/20877#discussion_r1750908668