RFR: 8297238: RISC-V: Unifying predicates for vector type matching in c2

[Fei Yang]

On Fri, 18 Nov 2022 13:12:54 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi,
> 
> In the vector type predicate matching process of riscv, n->bottom_type()->is_vect()->element_basic_type() is used in some places to get the data type, and Matcher::vector_element_basic_type(n) is used in some places to get the data type, In fact, Matcher::vector_element_basic_type(n) is the function encapsulation form of n->bottom_type()->is_vect()->element_basic_type(), here Matcher::vector_element_basic_type(n) is used uniformly to get the data type.
> 
> Please take a look and have some reviews. Thanks a lot.
> 
> ## Testing:
> - hotspot and jdk tier1 without new failures (release with UseRVV on QEMU)
> - test/jdk/jdk/incubator/vector/* (fastdebug/release with UseRVV on QEMU)

PS: I think it should be more specific to change the title of the JBS issue to something like: "RISC-V: C2: Use Matcher::vector_element_basic_type when checking for vector element type in predicate"

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PR: https://git.openjdk.org/jdk/pull/11239