RFR: 8344387: RISC-V: C2: Improve encoding of LoadNKlass for compact headers

[Fei Yang]

On Mon, 18 Nov 2024 11:32:27 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Hi,
> Can you help to review this patch? This is a follow-up of 8340453 on riscv.
> Thanks!

src/hotspot/cpu/riscv/riscv.ad line 4824:

> 4822:   ins_encode %{
> 4823:     __ lwu(as_Register($dst$$reg), Address(as_Register($mem$$base), $mem$$disp));
> 4824:     __ srli(as_Register($dst$$reg), as_Register($dst$$reg), (unsigned) markWord::klass_shift_at_offset);

Do we need this explicit unsigned type conversion?

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PR Review Comment: https://git.openjdk.org/jdk/pull/22203#discussion_r1846535954