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I have following asm MIPS code:
80031DB8 bnez $v0, loc_80031F58
80031DBC move $v0, $zero
as far as I understand “branch not equal zero” will never jump to loc_80031F58, because v0 = 0, is that right?
No. At the time of comparison,
$v0has whatever value prior to execution of80031DB8. After the comparison, when the delay slot executes and the jump is beginning to be taken,$v0is written with the value0.Once the branch is either taken or not taken,
$v0has the value zero. That is, at the start of execution of either80031F58(when the branch is taken) or 80031DC0 (when the branch is not taken),$v0will be0, although if the branch is taken, it must have had a non-zero value previously.