How Does Go Handle String Comparisons Under the Hood?

How String Comparisons Are Handled in Go

Go's string comparisons are a straightforward process, relying on underlying runtime functions for efficient execution.

Runtime Delegation

When comparing two string literals, Go seamlessly delegates the operation to the runtime.eqstring function. This runtime function takes over after a quick check to determine if the operands are the same in-memory string.

Inspecting Assembly

Delving into the assembly dump of a simple string comparison reveals the inner workings:

...
CMPQ    CX,AX
JNE     ,22
...
CALL    ,runtime.eqstring+0(SB)
...

After determining that the strings are of equal length, the runtime.eqstring function is invoked. This function efficiently compares the characters of the strings, returning the result of the comparison.

Performance Considerations

Unless actively involved in compiler or runtime development, it's generally not necessary to delve into the implementation details. However, it's important to acknowledge that string comparisons in Go are inherently O(n), where n is the length of the strings being compared.

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