Liam Proven writes: > Peter Corlett wrote: >> In ARM, *all* instructions can be predicated. Because instructions >> are 32 bits wide, it has the luxury of allocating four bits to select >> from one of 16 possible predicates based on the CPU flags. > > If I understand it correctly, this caused considerable problems for > the RISC OS people later. The original Acorn ARM machines used 26 bits > of the program counter as the PC, and the rest as flags. > > I'm not sure this is the same phenomenon you're describing.
It's not. Peter is talking about a four-bit field in the instructions. You're talking about a six-bit field in the program counter.
