RFR: 8375536: PPC64: Implement special MachNodes for floating point CMove [v5]

[Richard Reingruber]

On Fri, 30 Jan 2026 13:16:05 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> I think comments regarding your latest commit would be helpful. Seems to be related to the treatment of unordered results (comparison with NaN).

But wasn't the problem there the following:
We want to implement `<` with `>=`:

       op1 < op2  ? src1 : src2
<=> !(op1 >= op2) ? src1 : src2
<=>   op1 >= op2  ? src2 : src1

But the implementation was

op2 >= op1 ? src1 : src2

Which evaluates to src1 instead of src2 for op1 == op2.

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PR Comment: https://git.openjdk.org/jdk/pull/29281#issuecomment-3823933980