feat(proto): use memmove on amd64 for int columns

proto/cmd/ch-gen-col/infer.tpl

@@ -6,10 +6,10 @@ package proto
 // inferNumeric infers t as numeric type, otherwise returns false.
 func (c *ColAuto) inferNumeric(t ColumnType) bool {
 	switch t {
-	{{- range . }}
+	{{- range . }}{{- if not .Unsafe }}
 	case {{ .ColumnType }}:
 		c.Data = new({{ .Type }})
-	{{- end }}
+	{{- end }}{{- end }}
 	default:
 		return false
 	}

proto/cmd/ch-gen-col/main.go

@@ -26,9 +26,11 @@ const (
 )
 
 type Variant struct {
-	Kind   Kind
-	Signed bool
-	Bits   int
+	Kind           Kind
+	Signed         bool
+	Bits           int
+	GenerateUnsafe bool
+	Unsafe         bool
 }
 
 type Variants []Variant
@@ -304,8 +306,24 @@ func run() error {
 			})
 		}
 	}
+	for i, v := range variants {
+		if v.Bits <= 64 && !v.Byte() {
+			variants[i].GenerateUnsafe = true
+			variants = append(variants, Variant{
+				Kind:           v.Kind,
+				Signed:         v.Signed,
+				Bits:           v.Bits,
+				GenerateUnsafe: true,
+				Unsafe:         true,
+			})
+		}
+	}
 	for _, v := range variants {
-		base := "col_" + v.ElemLower() + "_gen"
+		base := "col_" + v.ElemLower()
+		if v.Unsafe {
+			base += "_unsafe"
+		}
+		base += "_gen"
 		if err := write(base, v, tpl); err != nil {
 			return errors.Wrap(err, "write")
 		}

proto/cmd/ch-gen-col/main.tpl

@@ -1,14 +1,21 @@
 {{- /*gotype: github.com/go-faster/ch/proto/cmd/ch-gen-col.Variant*/ -}}
+{{- if .GenerateUnsafe }}
+//go:build {{ if .Unsafe }}amd64 && !nounsafe{{ else }}!amd64 || nounsafe{{ end }}
+{{- end }}
 // Code generated by ./cmd/ch-gen-int, DO NOT EDIT.
 
 package proto
 
 import (
 	"encoding/binary"
 {{- if .IsFloat }}
-   "math"
+	"math"
+{{- end }}
+{{- if .Unsafe }}
+	"unsafe"
 {{- end }}
-  "github.com/go-faster/errors"
+
+	"github.com/go-faster/errors"
 )
 
 // ClickHouse uses LittleEndian.
@@ -112,17 +119,35 @@ func (c *{{ .Type }}) DecodeColumn(r *Reader, rows int) error {
   {{- else if .SingleByte }}
   v := *c
   v = append(v, make([]{{ .ElemType }}, rows)...)
+  {{- if .Unsafe }}
+  s := *(*struct {
+          Data unsafe.Pointer
+          Len uintptr
+          Cap uintptr
+  })(unsafe.Pointer(&v))
+  dst := *(*[]byte)(unsafe.Pointer(&s))
+  copy(dst, data)
+  {{- else }}
   for i := range data {
 	v[i] = {{ .ElemType }}(data[i])
   }
+  {{- end }}
   *c = v
   {{- else }}
   v := *c
-  // Move bound check out of loop.
-  //
-  // See https://github.com/golang/go/issues/30945.
-  _ = data[len(data)-size]
-  for i := 0; i <= len(data)-size; i += size {
+  {{- if .Unsafe }}
+  v = append(v, make([]{{ .ElemType }}, rows)...)
+  s := *(*struct {
+          Data unsafe.Pointer
+          Len uintptr
+          Cap uintptr
+  })(unsafe.Pointer(&v))
+  s.Len *= size
+  s.Cap *= size
+  dst := *(*[]byte)(unsafe.Pointer(&s))
+  copy(dst, data)
+  {{- else }}
+  for i := 0; i < len(data); i += size {
 	v = append(v,
 	{{- if .IsFloat }}
 	  math.{{ .Name }}frombits(bin.{{ .BinFunc }}(data[i:i+size])),
@@ -133,6 +158,7 @@ func (c *{{ .Type }}) DecodeColumn(r *Reader, rows int) error {
 	{{- end }}
 	)
   }
+  {{- end }}
   *c = v
   {{- end }}
   return nil

proto/cmd/ch-gen-col/test.tpl

@@ -1,4 +1,7 @@
 {{- /*gotype: github.com/go-faster/ch/proto/cmd/ch-gen-col.Variant*/ -}}
+{{- if .GenerateUnsafe }}
+//go:build {{ if .Unsafe }}amd64 && !nounsafe{{ else }}nounsafe{{ end }}
+{{- end }}
 // Code generated by ./cmd/ch-gen-int, DO NOT EDIT.
 
 package proto