[olliej]

Counting down to someone pointing at the annoyingly named ARM FJCVTZS instruction. The naming is obviously more about legal problems than reality, but so it goes.

To be very very clear: FJCVTZS does not do anything amazing, clever, or special. The problem it solves is very simple: the behaviour of double->int conversion in JS is the default x86 behaviour. Getting that behaviour on any non-x86 platform is expensive. So a more accurate name would be FXCVTZS. The implementation of FJCVTZS in a CPU is also not expensive, it simply requires passing a specific rounding mode to the FPU for the integer conversion (overriding the default/current global mode), and matching the x86 OOB result.

(Also I really wish people would stop posting to GitHub repos unless the repos have the actual readable spec available or linked, rather than the unbuilt markup version. It just makes reading them annoying.)