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Pull the 2006-01-02 layout to the top when checking 

The current top 2 formats are, from some checks I've done, 2 dominant formats used in Hugo projects.

Checking these first has a big effect:

```bash

name                  old time/op    new time/op    delta
CommonTimeLayouts-10    1.45µs ± 0%    0.33µs ± 1%  -77.45%  (p=0.029 n=4+4)

name                  old alloc/op   new alloc/op   delta
CommonTimeLayouts-10    1.55kB ± 0%    0.18kB ± 0%  -88.14%  (p=0.029 n=4+4)

name                  old allocs/op  new allocs/op  delta
CommonTimeLayouts-10      38.0 ± 0%       6.0 ± 0%  -84.21%  (p=0.029 n=4+4)
```

See https://github.com/gohugoio/hugo/issues/10942
This commit is contained in:
Bjørn Erik Pedersen 2023-05-15 10:09:44 +02:00
parent ba0a5b63c8
commit bbed5559a5
2 changed files with 13 additions and 1 deletions
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11
cast_test.go
View File

@ -897,6 +897,17 @@ func BenchmarkTrimZeroDecimal(b *testing.B) {
}
}
func BenchmarkCommonTimeLayouts(b *testing.B) {
for i := 0; i < b.N; i++ {
for _, commonLayout := range []string{"2019-04-29", "2017-05-30T00:00:00Z"} {
_, err := StringToDateInDefaultLocation(commonLayout, time.UTC)
if err != nil {
b.Fatal(err)
}
}
}
}
func TestIndirectPointers(t *testing.T) {
c := qt.New(t)

3
caste.go
View File

@ -1406,6 +1406,8 @@ func (f timeFormat) hasTimezone() bool {
var (
timeFormats = []timeFormat{
// Keep common formats at the top.
{"2006-01-02", timeFormatNoTimezone},
{time.RFC3339, timeFormatNumericTimezone},
{"2006-01-02T15:04:05", timeFormatNoTimezone}, // iso8601 without timezone
{time.RFC1123Z, timeFormatNumericTimezone},
@ -1421,7 +1423,6 @@ var (
{time.UnixDate, timeFormatNamedTimezone},
{time.RubyDate, timeFormatNumericTimezone},
{"2006-01-02 15:04:05Z07:00", timeFormatNumericTimezone},
{"2006-01-02", timeFormatNoTimezone},
{"02 Jan 2006", timeFormatNoTimezone},
{"2006-01-02 15:04:05 -07:00", timeFormatNumericTimezone},
{"2006-01-02 15:04:05 -0700", timeFormatNumericTimezone},