does golang compiler use constant folding?

Question

just wondering if "go" compiler uses any sort of optimization such as constant folding.

https://en.wikipedia.org/wiki/Constant_folding

searched through google but couldn't find the answer i'm looking for.

Answer 1

Constant folding - Wikipedia

Constant folding is the process of recognizing and evaluating constant expressions at compile time rather than computing them at runtime.

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The Go Programming Language Specification

Constant expressions

Constant expressions may contain only constant operands and are evaluated at compile time.

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Package big

import "math/big"

Package big implements arbitrary-precision arithmetic (big numbers).

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Go constant expressions are evaluated at compile time. The Go gc compiler, written in Go, uses package big to evaluate numeric constant expressions.

Answer 2

Try to write a simple program: eg.

package main

import "fmt"

func main() {
    fmt.Println(12345*1000)
}

And now compile it to assembly

go tool compile -S examle.go

And now find 12345 in the result and you will have an answer.