Why bgez and bltz have the same function code in MIPS -

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bgez , bltz have same function code in mips:000001, classified rt filed.however,bgtz , blez have different function code.why designer that?

there many opcodes can encode 6 bits. in cases more 1 instruction use same opcode, , additional bits in instruction word used determine instruction. or mips32™ architecture programmers volume i: introduction mips32™ architecture puts it:

opcode values not specify instruction instead specify instruction class. instructions within class further specified values in other fields.

they list instruction classes , other relevant fields in section a.2 instruction bit encoding tables.
you'll see e.g. opcode 000001 instruction class regimm, , instruction within class determined bits 20..16 according table (bits 20..19 on left, bits 18..16 on top):

       000      001     010      011    100   101  110  111 0  00  bltz    bgez    bltzl    bgezl    *     *    *    * 1  01  tgei    tgeiu   tlti     tltiu   teqi   *   tnei  * 2  10  bltzal  bgezal  bltzall  bgezall  *     *    *    * 3  11    *      *        *        *      *     *    *    *

perhaps seems arbitrary bltz part of regimm group while bgtz isn't. can't why is. in end doesn't matter though. matters there clear rules how instructions should encoded.


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