How to “NOT” a register in mips assembly
Since there isn't a NOT logical operator in mips assembly, how can one "not" the contents of a register?
Load -1 into another register, then XOR the registers. https://www.cs.umd.edu/class/sum2003/cmsc311/Notes/Mips/bitwise.html
You can use nor and the zero-register to fit everything into one instruction: nor $<dest_reg> $<in_reg> $zero Another approach would be using xor and -1 as this is encoded as 1111...1111 in 2s-component. li $<help_reg>, -1 # load -1 into help-register xor $<dest_reg>, $<in_reg>, $<help_reg> # actual not-operation
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