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implement readFloat32 fast path

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This commit is contained in:
Tao Wen
2017-01-15 17:30:02 +08:00
parent a57c8c6202
commit 5b2a731963
4 changed files with 181 additions and 79 deletions
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71
iterator.go
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@ -4,9 +4,7 @@ import (
"encoding/base64"
"fmt"
"io"
"strconv"
"unicode/utf16"
"unsafe"
)
type ValueType int
@ -71,7 +69,7 @@ type Iterator struct {
}
// Create creates an empty Iterator instance
func Create() *Iterator {
func NewIterator() *Iterator {
return &Iterator{
reader: nil,
buf: nil,
@ -570,73 +568,6 @@ func (iter *Iterator) ReadArray() (ret bool) {
}
}
// ReadFloat32 reads a json object as Float32
func (iter *Iterator) ReadFloat32() (ret float32) {
strBuf := [8]byte{}
str := strBuf[0:0]
hasMore := true
for hasMore {
for i := iter.head; i < iter.tail; i++ {
c := iter.buf[i]
switch c {
case '-', '+', '.', 'e', 'E', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
str = append(str, c)
continue
default:
hasMore = false
break
}
}
if hasMore {
if !iter.loadMore() {
break
}
}
}
if iter.Error != nil && iter.Error != io.EOF {
return
}
val, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&str)), 32)
if err != nil {
iter.Error = err
return
}
return float32(val)
}
// ReadFloat64 reads a json object as Float64
func (iter *Iterator) ReadFloat64() (ret float64) {
strBuf := [8]byte{}
str := strBuf[0:0]
hasMore := true
for hasMore {
for i := iter.head; i < iter.tail; i++ {
c := iter.buf[i]
switch c {
case '-', '+', '.', 'e', 'E', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
str = append(str, c)
continue
default:
hasMore = false
break
}
}
if hasMore {
if !iter.loadMore() {
break
}
}
}
if iter.Error != nil && iter.Error != io.EOF {
return
}
val, err := strconv.ParseFloat(*(*string)(unsafe.Pointer(&str)), 64)
if err != nil {
iter.Error = err
return
}
return val
}
// ReadBool reads a json object as Bool
func (iter *Iterator) ReadBool() (ret bool) {