Integrated: 8318227: RISC-V: C2 ConvHF2F

[Hamlin Li]

On Thu, 23 Nov 2023 17:13:47 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Hi,
> Can you review the patch to add ConvHF2F intrinsic to JDK for riscv？
> Thanks!
> 
> (By latest kernel patch, `#define		RISCV_HWPROBE_EXT_ZFH		(1 << 27)`
> https://lore.kernel.org/lkml/20231114141256.126749-11-cleger@rivosinc.com/)
> 
> ## Test
> ### Functionality
> #### hotspot tests
> test/hotspot/jtreg/compiler/intrinsics/ 
> test/hotspot/jtreg/compiler/c2/irTests
> 
> #### jdk tests
> test/jdk/java/lang/Float/Binary16Conversion*.java
> 
> ### Performance
> tested on licheepi.
> 
> #### with UseZfh enabled & stub out-of-band
> 
> Benchmark                                     (size)  Mode  Cnt      Score     Error  Units
> Fp16ConversionBenchmark.float16ToFloat          2048  avgt   10   3493.376 ?  18.631  ns/op
> Fp16ConversionBenchmark.float16ToFloatMemory    2048  avgt   10     19.819 ?   0.193  ns/op
> 
> 
> #### with UseZfh enabled only
> (i.e. enable the intrinsic)
> 
> Benchmark                                     (size)  Mode  Cnt      Score     Error  Units
> Fp16ConversionBenchmark.float16ToFloat          2048  avgt   10   4659.796 ?  13.262  ns/op
> Fp16ConversionBenchmark.float16ToFloatMemory    2048  avgt   10     22.957 ?   0.098  ns/op
> 
> 
> #### with UseZfh disabled
> (i.e. disable the intrinsic)
> 
> Benchmark                                     (size)  Mode  Cnt      Score    Error  Units
> Fp16ConversionBenchmark.float16ToFloat          2048  avgt   10  22930.591 ? 72.595  ns/op
> Fp16ConversionBenchmark.float16ToFloatMemory    2048  avgt   10     25.970 ?  0.063  ns/op

This pull request has now been integrated.

Changeset: b3634722
Author:    Hamlin Li <mli at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/b3634722655901b8d3e43dd1f8aa2b4487509a34
Stats:     84 lines in 12 files changed: 84 ins; 0 del; 0 mod

8318227: RISC-V: C2 ConvHF2F

Reviewed-by: fyang

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PR: https://git.openjdk.org/jdk/pull/16802