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encoding/base64: improve performance up to 20% total #36910

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encoding/base64: improve performance up to 20% total #36910

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26 changes: 14 additions & 12 deletions src/encoding/base64/base64.go
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Original file line number Diff line number Diff line change
Expand Up @@ -480,15 +480,16 @@ func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {

si := 0
for strconv.IntSize >= 64 && len(src)-si >= 8 && len(dst)-n >= 8 {
src2 := src[si : si+8]
if dn, ok := assemble64(
enc.decodeMap[src[si+0]],
enc.decodeMap[src[si+1]],
enc.decodeMap[src[si+2]],
enc.decodeMap[src[si+3]],
enc.decodeMap[src[si+4]],
enc.decodeMap[src[si+5]],
enc.decodeMap[src[si+6]],
enc.decodeMap[src[si+7]],
enc.decodeMap[src2[0]],
enc.decodeMap[src2[1]],
enc.decodeMap[src2[2]],
enc.decodeMap[src2[3]],
enc.decodeMap[src2[4]],
enc.decodeMap[src2[5]],
enc.decodeMap[src2[6]],
enc.decodeMap[src2[7]],
); ok {
binary.BigEndian.PutUint64(dst[n:], dn)
n += 6
Expand All @@ -504,11 +505,12 @@ func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
}

for len(src)-si >= 4 && len(dst)-n >= 4 {
src2 := src[si : si+4]
if dn, ok := assemble32(
enc.decodeMap[src[si+0]],
enc.decodeMap[src[si+1]],
enc.decodeMap[src[si+2]],
enc.decodeMap[src[si+3]],
enc.decodeMap[src2[0]],
enc.decodeMap[src2[1]],
enc.decodeMap[src2[2]],
enc.decodeMap[src2[3]],
); ok {
binary.BigEndian.PutUint32(dst[n:], dn)
n += 3
Expand Down