Synopsys:
peekiu ENDIAN,BITS
Given an IOS descriptor and a bit-offset, peek an unsigned integer value of width BITS bits. The endianness to be used is specified in the instruction arguments.
If there is a problem performing the operation, this function pushes an exception in the stack. Otherwise, it pushes the peeked value and PVM_NULL.
Stack: ( INT ULONG -- [INT] EXCEPTION|null )