Why does C++ promote an int to a float when a float cannot represent all int values?

When int is promoted to unsigned in the integral promotions, negative values are also lost (which leads to such fun as 0u < -1 being true). Like most mechanisms in C (that are inherited in C++), the usual arithmetic conversions should be understood in terms of hardware operations. The makers of C were very familiar … Read more

Why do ARM chips have an instruction with Javascript in the name (FJCVTZS)?

It is because JS uses double precision for the numbers, but if you want to perform operations with bits, the task is nontrivial, so a specific instruction to convert JS double into integer makes the thing easier. This ARM link explains it very well: https://community.arm.com/processors/b/blog/posts/armv8-a-architecture-2016-additions In order to add more information regarding fuz’s comment, the … Read more