VR4102 datasheet(96/701 Pages) NEC

96 / 701 page

CHAPTER 3 CPU INSTRUCTION SET SUMMARY

3.2.4 Special Instructions

Special instructions generate software exceptions.

Their formats are R-type (Syscall, Break). The Trap

instruction is available only for the VR4000 Series. All the other instructions are available for all VR Series.

Table 3-17. 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 3-18. 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

funct

SPECIAL

funct

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