Adding upstream version 0.0~git20250520.a1d9079+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

exp/f32/gen.go

@@ -0,0 +1,48 @@
+// Copyright 2014 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.
+
+//go:build ignore
+
+package main
+
+/*
+This program generates table.go. Invoke it as:
+go run gen.go -output table.go
+*/
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"go/format"
+	"log"
+	"math"
+	"os"
+)
+
+// N is the number of entries in the sin look-up table. It must be a power of 2.
+const N = 4096
+
+var filename = flag.String("output", "table.go", "output file name")
+
+func main() {
+	b := new(bytes.Buffer)
+	fmt.Fprintf(b, "// Code generated by go run gen.go; DO NOT EDIT\n\npackage f32\n\n")
+	fmt.Fprintf(b, "const sinTableLen = %d\n\n", N)
+	fmt.Fprintf(b, "// sinTable[i] equals sin(i * π / sinTableLen).\n")
+	fmt.Fprintf(b, "var sinTable = [sinTableLen]float32{\n")
+	for i := 0; i < N; i++ {
+		radians := float64(i) * (math.Pi / N)
+		fmt.Fprintf(b, "%v,\n", float32(math.Sin(radians)))
+	}
+	fmt.Fprintf(b, "}\n")
+
+	data, err := format.Source(b.Bytes())
+	if err != nil {
+		log.Fatal(err)
+	}
+	if err := os.WriteFile(*filename, data, 0644); err != nil {
+		log.Fatal(err)
+	}
+}