How do I write NOT Operation for the Risc-V (Assembly Language)? If there's no NOT instruction, how do you achieve the same thing?
How do I write NOT Operation for the Risc-V (Assembly Language)?
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Like MIPS and some other architectures, RISC V does not provide dedicated instructions for many things, including two-operand unary operations, as these operations can be had using their three-operand format, usually with
x0as the third operand, but sometimes constant1or-1as the third operand.For convenience, the assembler will accept what are called Pseudo Instructions for these unary operations (and others). Here's a list of the common RISC V pseudo instructions and their replacements.
To do more complex or unlisted things, use math & logic, and as many instructions as needed.
As an aside, there's an educational processor called the LC-3. It has only three arithmetic/logical operations:
ADD,AND,NOT. Yet students are expected to write code that does multiplication, division, modulus,XOR,OR, etc..!! Multiplication & division/modulus are done with a loop;XORandORare done using logic sequences — we know all the boolean operation can be had using only NAND gates, so having (only)AND&NOTis primitive but sufficient.My favorite sequence for
XORon that processor comes from this formula:Where here the
+is literallyADD, which works as a substitute forORbecause the two operands will never both be 1 at the same time, so carry from one bit position to another will not occur, and under those circumstances,ADDandORare equivalent.