NEC Network Controller uPD98502 - Manual (Page 81)

CHAPTER 2 V R 4120A
Preliminary User’s Manual S15543EJ1V0UM 81
2.2.2.4 Special instructions
Special instructions generate software exceptions. Their formats are R-type (Syscall, Break). The Trap instruction
is available only for the V
R
4000 Series. All the other instructions are available for all V
R
Series.
Table 2-19. Special Instructions
Instruction Format and Description
Synchronize SYNC
Completes the load/store instruction executing in the current pipeline before the next load/store
instruction starts execution.
System Call SYSCALL
Generates a system call exception, and then transits control to the exception handling program.
Breakpoint BREAK
Generates a break point exception, and then transits control to the exception handling program.
Table 2-20. Special Instructions (Extended ISA) (1/2)
Instruction Format and Description
Trap If Greater Than Or
Equal
TGE rs, rt
The contents of register rs are compared with that of register rt, treating both operands as signed
integers. If the contents of register rs are greater than or equal to that of register rt, an exception
occurs.
Trap If Greater Than Or
Equal Unsigned
TGEU rs, rt
The contents of register rs are compared with that of register rt, treating both operands as unsigned
integers. If the contents of register rs are greater than or equal to that of register rt, an exception
occurs.
Trap If Less Than TLT rs, rt
The contents of register rs are compared with that of register rt, treating both operands as signed
integers. If the contents of register rs are less than that of register rt, an exception occurs.
Trap If Less Than
Unsigned
TLTU rs, rt
The contents of register rs are compared with that of register rt, treating both operands as unsigned
integers. If the contents of register rs are less than that of register rt, an exception occurs.
Trap If Equal TEQ rs, rt
If the contents of registers rs and rt are equal, an exception occurs.
Trap If Not Equal TNE rs, rt
If the contents of registers rs and rt are not equal, an exception occurs.
SPECIAL rs rt funct rd sa
SPECIAL rs rt funct rd sa