Peephole optimization is an optimization technique performed on a small set of compiler-generated instructions; the small set is known as the peephole or window.[1]
Peephole optimization involves changing the small set of instructions to an equivalent set that has better performance.
For example:
instead of pushing register A onto the stack and then immediately popping the value back into register A, a peephole optimization would remove both instructions;
instead of multiplying x by 2, it is likely faster to do x + x.
instead of multiplying a floating point register by 8, a peephole optimization might add 3 to the floating point register's exponent; and
instead of multiplying an index by 4, adding the result to a base address to get a pointer value, and then dereferencing the pointer, a peephole optimization might use a hardware addressing mode that accomplishes the same result with one instruction.
The term peephole optimization was introduced by William Marshall McKeeman in 1965.[2]
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