Integrated: 8352585: Add special case handling for Float16.max/min x86 backend

[Jatin Bhateja]

On Fri, 21 Mar 2025 20:20:24 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> This bugfix patch adds the special handling as per x86 AVX512-FP16 ISA specification[1][2] to compute max/min operations with +/-0.0 or NaN operands.
> 
> Special handling leverage the instruction semantic, central idea is to shuffle the operands such that smaller input gets assigned to second operand for min operation or a larger input gets assigned to second operand for max operation, in addition result equals NaN if an unordered comparison detects first input as a NaN value else we return the result of min/max operation. 
> 
> Kindly review and share your feedback.
> 
> Best Regards,
> Jatin
> 
> [1] https://www.felixcloutier.com/x86/vminsh
> [2] https://www.felixcloutier.com/x86/vmaxsh

This pull request has now been integrated.

Changeset: f7a94fee
Author:    Jatin Bhateja <jbhateja at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/f7a94feedd63775a09d0bcb9ef3313972e2a5d69
Stats:     260 lines in 6 files changed: 254 ins; 6 del; 0 mod

8352585: Add special case handling for Float16.max/min x86 backend

Reviewed-by: epeter, sviswanathan

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PR: https://git.openjdk.org/jdk/pull/24169