1 files changed, 73 insertions, 0 deletions
diff --git a/src/simd/_gen/simdgen/pprint.go b/src/simd/_gen/simdgen/pprint.go
new file mode 100644
index 0000000000..054b51761d
--- /dev/null
+++ b/src/simd/_gen/simdgen/pprint.go
@@ -0,0 +1,73 @@
+// Copyright 2025 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+)
+
+func pprints(v any) string {
+	var pp pprinter
+	pp.val(reflect.ValueOf(v), 0)
+	return string(pp.buf)
+}
+
+type pprinter struct {
+	buf []byte
+}
+
+func (p *pprinter) indent(by int) {
+	for range by {
+		p.buf = append(p.buf, '\t')
+	}
+}
+
+func (p *pprinter) val(v reflect.Value, indent int) {
+	switch v.Kind() {
+	default:
+		p.buf = fmt.Appendf(p.buf, "unsupported kind %v", v.Kind())
+
+	case reflect.Bool:
+		p.buf = strconv.AppendBool(p.buf, v.Bool())
+
+	case reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64:
+		p.buf = strconv.AppendInt(p.buf, v.Int(), 10)
+
+	case reflect.String:
+		p.buf = strconv.AppendQuote(p.buf, v.String())
+
+	case reflect.Pointer:
+		if v.IsNil() {
+			p.buf = append(p.buf, "nil"...)
+		} else {
+			p.buf = append(p.buf, "&"...)
+			p.val(v.Elem(), indent)
+		}
+
+	case reflect.Slice, reflect.Array:
+		p.buf = append(p.buf, "[\n"...)
+		for i := range v.Len() {
+			p.indent(indent + 1)
+			p.val(v.Index(i), indent+1)
+			p.buf = append(p.buf, ",\n"...)
+		}
+		p.indent(indent)
+		p.buf = append(p.buf, ']')
+
+	case reflect.Struct:
+		vt := v.Type()
+		p.buf = append(append(p.buf, vt.String()...), "{\n"...)
+		for f := range v.NumField() {
+			p.indent(indent + 1)
+			p.buf = append(append(p.buf, vt.Field(f).Name...), ": "...)
+			p.val(v.Field(f), indent+1)
+			p.buf = append(p.buf, ",\n"...)
+		}
+		p.indent(indent)
+		p.buf = append(p.buf, '}')
+	}
+}