vendor: github.com/moby/buildkit v0.21.0-rc1

Signed-off-by: Jonathan A. Sternberg <jonathan.sternberg@docker.com>

vendor/github.com/klauspost/compress/zstd/matchlen_generic.go

@@ -7,20 +7,25 @@
 package zstd
 
 import (
-	"encoding/binary"
 	"math/bits"
+
+	"github.com/klauspost/compress/internal/le"
 )
 
 // matchLen returns the maximum common prefix length of a and b.
 // a must be the shortest of the two.
 func matchLen(a, b []byte) (n int) {
-	for ; len(a) >= 8 && len(b) >= 8; a, b = a[8:], b[8:] {
-		diff := binary.LittleEndian.Uint64(a) ^ binary.LittleEndian.Uint64(b)
+	left := len(a)
+	for left >= 8 {
+		diff := le.Load64(a, n) ^ le.Load64(b, n)
 		if diff != 0 {
 			return n + bits.TrailingZeros64(diff)>>3
 		}
 		n += 8
+		left -= 8
 	}
+	a = a[n:]
+	b = b[n:]
 
 	for i := range a {
 		if a[i] != b[i] {