GP probably meant a “JS” instruction rather than a “JVM” one: FJCVTZS, “Floating-point Javascript Convert to Signed fixed-point rounding towards Zero”[1,2], int

GP probably meant a “JS” instruction rather than a “JVM” one: FJCVTZS, “Floating-point Javascript Convert to Signed fixed-point rounding towards Zero”[1,2], introduced in ARMv8.3 at Apple’s behest (or so it is said). Apparently the point is that ARM float-to-integer conversions normally saturate on overflow while x86 reduces the integer mod 2^width, and JavaScript baked the x86 behaviour into the language. [1] https://developer.arm.com/documentation/ddi0602/2022-12/SIMD-FP-Instructions/FJCVTZS--Floating-point-Javascript-Convert-to-Signed-fixed-point--rounding-toward-Zero- https://developer.arm.com/documentation/ddi0602/2022-12/SIMD... [2] https://news.ycombinator.com/item?id=24808207 https://news.ycombinator.com/item?id=24808207