On 32-bit architectures, the total size of the Prolog stacks cannot
exceed 256 MB. Under Linux, the default placement of the TEXT
segment constrains the Prolog stack address range, so in practice the
limit there is 128 MB unless the spld option --more-memory
is used.
The number of arguments of a compound term may not exceed 255.
The number of atoms created may not exceed 262143 (33554431) on 32-bit (64-bit) architectures.
The number of characters of an atom may not exceed 65535.
NUL is not a legal character in atoms.
There are 256 "temporary" and 256 "permanent" variables available for compiled clauses.
Saved states are not portable between 32-bit and 64-bit architectures, or from a system built with native code support to a system without native code support for the same architecture.
Indexing on big integers or floats is coarse.