Comparison Instructions

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The table below lists some comparison instructions. They are with the R-type format except slti and sltiu, which are with the I-type format.

These instructions perform a comparison rs op rt, where op is the comparison contained in the op-code of the instruction (eq—equal, ne—not equal, lt—less than, etc.), and sets the value of rd to 1 if the comparison is TRUE, and to 0 if FALSE. Most commonly, these are used in conjunction with the conditional branch instructions to make decisions.

Instruction Description seq rd, rs, rt Set equal sne rd, rs, rt Set not equal slt rd, rs, rt Set less sltu rd, rs, rt Set less unsigned slti rd, rs, imm Set less immediate sltiu rd, rs, imm Set less immediate unsigned sle rd, rs, rt Set less or equal sleu rd, rs, rt Set less or equal unsigned sgt rd, rs, rt Set greater sgtu rd, rs, rt Set greater unsigned sge rd, rs, rt Set greater or equal sgeu rd, rs, rt Set greater or equal unsigned

seq rd, rs, rt         # set equal

Compares two 32-bit values. If the contents of rs equal the contents of rt (or rs equals the immediate value) it sets the destination register to one; otherwise, it sets the destination register to zero.

sne rd, rs, rt         # set not equal

Compares two 32-bit values. If the contents of rs are not equal to the contents of rt (or rs is not equal to the immediate value), it sets the destination to one; otherwise, it sets the destination to zero.

slt rd, rs, rt         # set less

Compares two signed 32-bit values. If the contents of rs are less than the contents of rt (or rs is less than the immediate value), this instruction sets the destination register to 1; otherwise, it sets the destination register to 0.