[riscv-port-jdk17u:riscv-port] RFR: 8294366: RISC-V: Partially mark out incompressible regions

[Feilong Jiang]

On Mon, 27 Mar 2023 04:16:19 GMT, Xiaolin Zheng <xlinzheng at openjdk.org> wrote:

> One little difference: there is no `C2_MacroAssembler::emit_entry_barrier_stub` on JDK17.
> 
> Tested along with remaining patches, hotspot tier1~4 with fastdebug build.

src/hotspot/cpu/riscv/assembler_riscv.hpp line 2119:

> 2117: //
> 2118: //      CompressibleRegion cr(_masm);
> 2119: //      __ add(...);       // this instruction will be compressed into 'c.and' when possible

Comments use `c.and`, but the example asm uses `add`, is this a typo?

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PR Review Comment: https://git.openjdk.org/riscv-port-jdk17u/pull/28#discussion_r1150457279