1 files changed, 166 insertions, 0 deletions
diff --git a/test/rotate.go b/test/rotate.go
new file mode 100644
index 000000000..1d7149702
--- /dev/null
+++ b/test/rotate.go
@@ -0,0 +1,166 @@
+// skip
+
+// NOTE: the actual tests to run are rotate[0123].go
+
+// Copyright 2012 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.
+
+// Generate test of shift and rotate by constants.
+// The output is compiled and run.
+//
+// The integer type depends on the value of mode (rotate direction,
+// signedness).
+
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	flag.Parse()
+
+	b := bufio.NewWriter(os.Stdout)
+	defer b.Flush()
+
+	fmt.Fprintf(b, "%s\n", prolog)
+
+	for logBits := uint(3); logBits <= 6; logBits++ {
+		typ := fmt.Sprintf("int%d", 1<<logBits)
+		fmt.Fprint(b, strings.Replace(checkFunc, "XXX", typ, -1))
+		fmt.Fprint(b, strings.Replace(checkFunc, "XXX", "u"+typ, -1))
+		gentest(b, 1<<logBits, mode&1 != 0, mode&2 != 0)
+	}
+}
+
+const prolog = `
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+var (
+	i8 int8 = 0x12
+	i16 int16 = 0x1234
+	i32 int32 = 0x12345678
+	i64 int64 = 0x123456789abcdef0
+	ui8 uint8 = 0x12
+	ui16 uint16 = 0x1234
+	ui32 uint32 = 0x12345678
+	ui64 uint64 = 0x123456789abcdef0
+
+	ni8 = ^i8
+	ni16 = ^i16
+	ni32 = ^i32
+	ni64 = ^i64
+	nui8 = ^ui8
+	nui16 = ^ui16
+	nui32 = ^ui32
+	nui64 = ^ui64
+)
+
+var nfail = 0
+
+func main() {
+	if nfail > 0 {
+		fmt.Printf("BUG\n")
+	}
+}
+
+`
+
+const checkFunc = `
+func check_XXX(desc string, have, want XXX) {
+	if have != want {
+		nfail++
+		fmt.Printf("%s = %T(%#x), want %T(%#x)\n", desc, have, have, want, want)
+		if nfail >= 100 {
+			fmt.Printf("BUG: stopping after 100 failures\n")
+			os.Exit(0)
+		}
+	}
+}
+`
+
+var (
+	uop = [2]func(x, y uint64) uint64{
+		func(x, y uint64) uint64 {
+			return x | y
+		},
+		func(x, y uint64) uint64 {
+			return x ^ y
+		},
+	}
+	iop = [2]func(x, y int64) int64{
+		func(x, y int64) int64 {
+			return x | y
+		},
+		func(x, y int64) int64 {
+			return x ^ y
+		},
+	}
+	cop = [2]byte{'|', '^'}
+)
+
+func gentest(b *bufio.Writer, bits uint, unsigned, inverted bool) {
+	fmt.Fprintf(b, "func init() {\n")
+	defer fmt.Fprintf(b, "}\n")
+	n := 0
+
+	// Generate tests for left/right and right/left.
+	for l := uint(0); l <= bits; l++ {
+		for r := uint(0); r <= bits; r++ {
+			for o, op := range cop {
+				typ := fmt.Sprintf("int%d", bits)
+				v := fmt.Sprintf("i%d", bits)
+				if unsigned {
+					typ = "u" + typ
+					v = "u" + v
+				}
+				v0 := int64(0x123456789abcdef0)
+				if inverted {
+					v = "n" + v
+					v0 = ^v0
+				}
+				expr1 := fmt.Sprintf("%s<<%d %c %s>>%d", v, l, op, v, r)
+				expr2 := fmt.Sprintf("%s>>%d %c %s<<%d", v, r, op, v, l)
+
+				var result string
+				if unsigned {
+					v := uint64(v0) >> (64 - bits)
+					v = uop[o](v<<l, v>>r)
+					v <<= 64 - bits
+					v >>= 64 - bits
+					result = fmt.Sprintf("%#x", v)
+				} else {
+					v := int64(v0) >> (64 - bits)
+					v = iop[o](v<<l, v>>r)
+					v <<= 64 - bits
+					v >>= 64 - bits
+					result = fmt.Sprintf("%#x", v)
+				}
+
+				fmt.Fprintf(b, "\tcheck_%s(%q, %s, %s(%s))\n", typ, expr1, expr1, typ, result)
+				fmt.Fprintf(b, "\tcheck_%s(%q, %s, %s(%s))\n", typ, expr2, expr2, typ, result)
+
+				// Chop test into multiple functions so that there's not one
+				// enormous function to compile/link.
+				// All the functions are named init so we don't have to do
+				// anything special to call them.  ☺
+				if n++; n >= 50 {
+					fmt.Fprintf(b, "}\n")
+					fmt.Fprintf(b, "func init() {\n")
+					n = 0
+				}
+			}
+		}
+	}
+}