Homework Answers
Write the branch outcome for each of the following independent set of instructions:
R1 = FFFF FFFF16
R2 = 0000 000116
(1) slt R3, R1, R2
beq R3, R0, target
Branch outcome: not-taken branch (branch condition is false)
Description:
• slt R3, R1, R2 ; Set on less than. if R1 < R2 then set register R3 = 1 otherwise R3 = 0.
• beq R3, R0, target ; if R3 = R0 that means if R3 = 0 then Branch to target
• This instruction compares the register R1 and R2 in 2's complement form.
• According to two's complement form, R1 represents -1 and R2 represents +1 value.
• Here, R1 < R2 means -1 < +1 is true. So, set the register R3 = 1.
• Branch will not be taken as R3 = 1.
(2) sltu R3, R1, R2
beq R3, R0, target
Branch outcome: taken branch (branch condition is true)
Description:
• sltu R3, R1, R2 ; Set on less than Unsigned. if R1 < R2 then set register R3 = 1 otherwise R3 = 0.
• beq R3, R0, target ; if R3 = R0 that means if R3 = 0 then Branch to target
• This instruction compares the register R1 and R2 in natural number form.
• According to natural number form, R1 represents 4294967295 and R2 represents 1 value.
• Here, R1 < R2 is false. So, the register R3 = 0.
• Branch will be taken as R3 = 0.
(3) slti R3, R1, 8
beq R3, R0, target
Branch outcome: not-taken branch (branch condition is false)
Description:
• slti R3, R1, 8 ; Set on less than Immediate. if R1 < 8 then set register R3 = 1 otherwise R3 = 0.
• beq R3, R0, target ; if R3 = R0 that means if R3 = 0 then Branch to target
• This instruction compares the register R1 and the immediate 8 in 2's complement form.
• According to two's complement form, R1 represents -1 value.
• Here, R1 < R2 means -1 < 8 is true. So, set the register R3 = 1.
• Branch will not be taken as R3 = 1.
(4) sltui R3, R1, 8
beq R3, R0, target
Branch outcome: taken branch (branch condition is true)
Description:
• sltui R3, R1, 8 ; Set on less than Unsigned Immediate. if R1 < 8 then set R3 = 1 otherwise R3 = 0.
• beq R3, R0, target ; if R3 = R0 that means if R3 = 0 then Branch to target
• This instruction compares the register R1 and immediate 8 in natural number form.
• According to natural number form, R1 represents 4294967295 value.
• Here, 4294967295 < 8 is false. So, the register R3 = 0.
• Branch will be taken as R3 = 0.
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