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strings.EqualsFold() is faster #47

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azumakuniyuki opened this issue Feb 6, 2025 · 0 comments

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speed-up

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azumakuniyuki commented Feb 6, 2025 •

edited

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package main
import (
    "strings"
    "testing"
)
var Text = "rfc822"

func BenchmarkToLower(b *testing.B) {
    cv := "RFC822"
	ci := 0
    for i := 0; i < b.N; i++ { if strings.ToLower(cv) == Text { ci++ } }
}

func BenchmarkEqualFold(b *testing.B) {
    cv := "RFC822"
	ci := 0
    for i := 0; i < b.N; i++ { if strings.EqualFold(cv, Text) { ci++ } }
}

% go test -bench=.
goos: darwin
goarch: amd64
pkg: libsisimai.org/sisimai/benchmark/equalfold
cpu: Intel(R) Core(TM) i5-8210Y CPU @ 1.60GHz
BenchmarkToLower-4     	14093912	        86.34 ns/op
BenchmarkEqualFold-4   	58651954	        19.54 ns/op
PASS
ok  	libsisimai.org/sisimai/benchmark/equalfold	4.263s
go test -bench=.  3.78s user 0.95s system 83% cpu 5.653 total

azumakuniyuki added the speed-up label

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