On Thursday, 30 April 2015 at 14:27:17 UTC, Jens Bauer wrote:
{snip} or make a 32-bit uniqueID (perhaps even a 16-bit UID).
Note: The most frequently used typeinfo should have the lowest ID numbers, because on small devices, loading a small value into a register, will use very little space.
Of course, an 8-bit value can be supported on most systems.On ARM Cortex-M3 and later, we have several ways of loading small values. One is the 'modified immediate', which is one of the following:
(8-bit value) << (0 ..24) (8-bit value) * 0x00010001 (8-bit value) * 0x01000100 (8-bit value) * 0x01010101 Then there's a 16-bit load using movw.Both modified immediate and movw uses 32-bit instructions, but a direct 8-bit value can be loaded using the 16-bit mov.n instruction (also on Cortex-M0).
... My point is that if sorting things like UniqueIDs would result in smaller binaries.
