RFR: 8355704: RISC-V: enable TestIRFma.java

[Robbin Ehn]

On Tue, 29 Apr 2025 12:47:25 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Hi,
> Can you help to review this patch to enable TestIRFma.java?
> FmaF/D (checked by TestIRFma.java) are supported on riscv, but for some reason we can not enable it easily, but we should enable it.
> 
> NOTE: the reason I change IRNode matching rules is that, previously it verify the `FINAL CODE` where every platform could have different instruct name; I change it from machOnlyNameRegex to beforeMatchingNameRegex, to make it verify the `PrintIdeal` where every platform share the same names.
> 
> Also tested on machine with `asimd` support.
> 
> Thanks!

test/hotspot/jtreg/compiler/c2/irTests/TestIRFma.java line 89:

> 87: 
> 88:     @Test
> 89:     @IR(counts = {IRNode.FMSUB_F, "> 0", IRNode.NEG_F, "> 0"},

What is the reason for adding the "IRNode.NEG_F" ?

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PR Review Comment: https://git.openjdk.org/jdk/pull/24947#discussion_r2068508778