Integrated: JDK-8290137: riscv: small refactoring for add_memory_int32/64

[Fei Yang]

On Tue, 12 Jul 2022 08:14:05 GMT, Fei Yang <fyang at openjdk.org> wrote:

> Currently, add_memory_int32/64 for riscv can only add a sign-extended 12-bit immediate to memory since they call addi/addiw assembler direcly. This constraint could be relaxed when the given memory address is in the expected form: base register plus a sign-extended 12-bit offset. In this case, we can emit code for load + add/sub + store sequence adding arbitrary immediate to memory with no more than two scratch registers (t0 and t1) available.
> 
> We could also refactor these two functions into four seperate functions: increment, incrementw, decrement and decrementw, so that it will be more clear in code logic at the call sites.
> 
> Testing: tier1 tested on riscv64-linux unmatched board.

This pull request has now been integrated.

Changeset: 92067e20
Author:    Fei Yang <fyang at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/92067e200346c41c2f43763edc01c97c7da1a9e6
Stats:     87 lines in 8 files changed: 40 ins; 0 del; 47 mod

8290137: riscv: small refactoring for add_memory_int32/64

Reviewed-by: yadongwang, fjiang, shade

-------------

PR: https://git.openjdk.org/jdk/pull/9461