RFR: 8352585: Add special case handling for Float16.max/min x86 backend [v2]

[Sandhya Viswanathan]

On Tue, 25 Mar 2025 08:31:06 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp line 7093:
>> 
>>> 7091: }
>>> 7092: 
>>> 7093: void C2_MacroAssembler::scalar_max_min_fp16(int opcode, XMMRegister dst, XMMRegister src1, XMMRegister src2,
>> 
>> Any reason we are not doing this on lines of scalar emit_fp_min_max? For most common cases emit_fp_min_max based sequence would have much better latency.
>
> We don't need any blend emulation on CPUs supporting AVX512-FP16, it's specific to E-core targets.

emit_fp_min_max in x86_64.ad doesn't have any blend emulation.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24169#discussion_r2012311161