On Tue, 7 Feb 2023 12:53:25 GMT, Tagir F. Valeev <tval...@openjdk.org> wrote:
>> clamp() methods added to Math and StrictMath >> >> `int clamp(long, int, int)` is somewhat different, as it accepts a `long` >> value and safely clamps it to an `int` range. Other overloads work with a >> particular type (long, float and double). Using similar approach in other >> cases (e.g. `float clamp(double, float, float)`) may cause accidental >> precision loss even if the value is within range, so I decided to avoid this. >> >> In all cases, `max >= min` precondition should met. For double and float we >> additionally order `-0.0 < 0.0`, similarly to what Math.max or >> Double.compare do. In double and float overloads I try to keep at most one >> arg-check comparison on common path, so the order of checks might look >> unusual. >> >> For tests, I noticed that tests in java/lang/Math don't use any testing >> framework (even newer tests), so I somehow mimic the approach of neighbour >> tests. > > Tagir F. Valeev has updated the pull request incrementally with one > additional commit since the last revision: > > Comments in tests Is it ever possible to optimize clamp() impl ? I suppose 2 if conditions can be simplified: return (int) Math.min(max, Math.max(value, min)); Maybe hotspot c2 can deduce it or using intrinsics: If value<=min: return min If value>=max: return max return value (NaN compatible=>NaN) ------------- PR: https://git.openjdk.org/jdk/pull/12428
