vendor: update c/storage

Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>

vendor/github.com/klauspost/compress/flate/fast_encoder.go

@@ -6,8 +6,10 @@
 package flate
 
 import (
-	"encoding/binary"
 	"fmt"
+	"math/bits"
+
+	"github.com/klauspost/compress/internal/le"
 )
 
 type fastEnc interface {
@@ -58,11 +60,11 @@ const (
 )
 
 func load3232(b []byte, i int32) uint32 {
-	return binary.LittleEndian.Uint32(b[i:])
+	return le.Load32(b, i)
 }
 
 func load6432(b []byte, i int32) uint64 {
-	return binary.LittleEndian.Uint64(b[i:])
+	return le.Load64(b, i)
 }
 
 type tableEntry struct {
@@ -134,8 +136,8 @@ func hashLen(u uint64, length, mls uint8) uint32 {
 // matchlen will return the match length between offsets and t in src.
 // The maximum length returned is maxMatchLength - 4.
 // It is assumed that s > t, that t >=0 and s < len(src).
-func (e *fastGen) matchlen(s, t int32, src []byte) int32 {
-	if debugDecode {
+func (e *fastGen) matchlen(s, t int, src []byte) int32 {
+	if debugDeflate {
 		if t >= s {
 			panic(fmt.Sprint("t >=s:", t, s))
 		}
@@ -149,18 +151,34 @@ func (e *fastGen) matchlen(s, t int32, src []byte) int32 {
 			panic(fmt.Sprint(s, "-", t, "(", s-t, ") > maxMatchLength (", maxMatchOffset, ")"))
 		}
 	}
-	s1 := int(s) + maxMatchLength - 4
-	if s1 > len(src) {
-		s1 = len(src)
+	s1 := min(s+maxMatchLength-4, len(src))
+	left := s1 - s
+	n := int32(0)
+	for left >= 8 {
+		diff := le.Load64(src, s) ^ le.Load64(src, t)
+		if diff != 0 {
+			return n + int32(bits.TrailingZeros64(diff)>>3)
+		}
+		s += 8
+		t += 8
+		n += 8
+		left -= 8
 	}
 
-	// Extend the match to be as long as possible.
-	return int32(matchLen(src[s:s1], src[t:]))
+	a := src[s:s1]
+	b := src[t:]
+	for i := range a {
+		if a[i] != b[i] {
+			break
+		}
+		n++
+	}
+	return n
 }
 
 // matchlenLong will return the match length between offsets and t in src.
 // It is assumed that s > t, that t >=0 and s < len(src).
-func (e *fastGen) matchlenLong(s, t int32, src []byte) int32 {
+func (e *fastGen) matchlenLong(s, t int, src []byte) int32 {
 	if debugDeflate {
 		if t >= s {
 			panic(fmt.Sprint("t >=s:", t, s))
@@ -176,7 +194,28 @@ func (e *fastGen) matchlenLong(s, t int32, src []byte) int32 {
 		}
 	}
 	// Extend the match to be as long as possible.
-	return int32(matchLen(src[s:], src[t:]))
+	left := len(src) - s
+	n := int32(0)
+	for left >= 8 {
+		diff := le.Load64(src, s) ^ le.Load64(src, t)
+		if diff != 0 {
+			return n + int32(bits.TrailingZeros64(diff)>>3)
+		}
+		s += 8
+		t += 8
+		n += 8
+		left -= 8
+	}
+
+	a := src[s:]
+	b := src[t:]
+	for i := range a {
+		if a[i] != b[i] {
+			break
+		}
+		n++
+	}
+	return n
 }
 
 // Reset the encoding table.