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https://github.com/golang/go
synced 2024-11-12 03:50:21 -07:00
fmt: speed up 10-20%
The check for Stringer etc. can only fire if the test is not a builtin, so avoid the expensive check if we know there's no chance. Also put in a fast path for pad, which saves a more modest amount. benchmark old ns/op new ns/op delta BenchmarkSprintfEmpty 148 152 +2.70% BenchmarkSprintfString 585 497 -15.04% BenchmarkSprintfInt 441 396 -10.20% BenchmarkSprintfIntInt 718 603 -16.02% BenchmarkSprintfPrefixedInt 676 621 -8.14% BenchmarkSprintfFloat 1003 953 -4.99% BenchmarkManyArgs 2945 2312 -21.49% BenchmarkScanInts 1704152 1734441 +1.78% BenchmarkScanRecursiveInt 1837397 1828920 -0.46% R=golang-dev, bradfitz CC=golang-dev https://golang.org/cl/6245068
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@ -527,6 +527,14 @@ func BenchmarkSprintfFloat(b *testing.B) {
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}
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}
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func BenchmarkManyArgs(b *testing.B) {
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var buf bytes.Buffer
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for i := 0; i < b.N; i++ {
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buf.Reset()
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Fprintf(&buf, "%2d/%2d/%2d %d:%d:%d %s %s\n", 3, 4, 5, 11, 12, 13, "hello", "world")
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}
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}
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var mallocBuf bytes.Buffer
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var mallocTest = []struct {
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@ -110,11 +110,11 @@ func (f *fmt) writePadding(n int, padding []byte) {
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// Append b to f.buf, padded on left (w > 0) or right (w < 0 or f.minus)
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// clear flags afterwards.
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func (f *fmt) pad(b []byte) {
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var padding []byte
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var left, right int
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if f.widPresent && f.wid != 0 {
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padding, left, right = f.computePadding(len(b))
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if !f.widPresent || f.wid == 0 {
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f.buf.Write(b)
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return
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}
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padding, left, right := f.computePadding(len(b))
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if left > 0 {
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f.writePadding(left, padding)
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}
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@ -127,11 +127,11 @@ func (f *fmt) pad(b []byte) {
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// append s to buf, padded on left (w > 0) or right (w < 0 or f.minus).
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// clear flags afterwards.
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func (f *fmt) padString(s string) {
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var padding []byte
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var left, right int
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if f.widPresent && f.wid != 0 {
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padding, left, right = f.computePadding(utf8.RuneCountInString(s))
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if !f.widPresent || f.wid == 0 {
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f.buf.WriteString(s)
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return
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}
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padding, left, right := f.computePadding(utf8.RuneCountInString(s))
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if left > 0 {
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f.writePadding(left, padding)
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}
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@ -734,10 +734,6 @@ func (p *pp) printField(field interface{}, verb rune, plus, goSyntax bool, depth
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return false
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}
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if wasString, handled := p.handleMethods(verb, plus, goSyntax, depth); handled {
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return wasString
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}
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// Some types can be done without reflection.
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switch f := field.(type) {
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case bool:
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@ -779,6 +775,10 @@ func (p *pp) printField(field interface{}, verb rune, plus, goSyntax bool, depth
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p.fmtBytes(f, verb, goSyntax, depth)
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wasString = verb == 's'
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default:
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// If the type is not simple, it might have methods.
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if wasString, handled := p.handleMethods(verb, plus, goSyntax, depth); handled {
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return wasString
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}
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// Need to use reflection
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return p.printReflectValue(reflect.ValueOf(field), verb, plus, goSyntax, depth)
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}
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