1 files changed, 161 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/gc/testdata/string_ssa.go b/src/cmd/compile/internal/gc/testdata/string_ssa.go
new file mode 100644
index 0000000000..a949fbcefb
--- /dev/null
+++ b/src/cmd/compile/internal/gc/testdata/string_ssa.go
@@ -0,0 +1,161 @@
+// Copyright 2015 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.
+
+// string_ssa.go tests string operations.
+package main
+
+var failed = false
+
+//go:noinline
+func testStringSlice1_ssa(a string, i, j int) string {
+	return a[i:]
+}
+
+//go:noinline
+func testStringSlice2_ssa(a string, i, j int) string {
+	return a[:j]
+}
+
+//go:noinline
+func testStringSlice12_ssa(a string, i, j int) string {
+	return a[i:j]
+}
+
+func testStringSlice() {
+	tests := [...]struct {
+		fn        func(string, int, int) string
+		s         string
+		low, high int
+		want      string
+	}{
+		// -1 means the value is not used.
+		{testStringSlice1_ssa, "foobar", 0, -1, "foobar"},
+		{testStringSlice1_ssa, "foobar", 3, -1, "bar"},
+		{testStringSlice1_ssa, "foobar", 6, -1, ""},
+		{testStringSlice2_ssa, "foobar", -1, 0, ""},
+		{testStringSlice2_ssa, "foobar", -1, 3, "foo"},
+		{testStringSlice2_ssa, "foobar", -1, 6, "foobar"},
+		{testStringSlice12_ssa, "foobar", 0, 6, "foobar"},
+		{testStringSlice12_ssa, "foobar", 0, 0, ""},
+		{testStringSlice12_ssa, "foobar", 6, 6, ""},
+		{testStringSlice12_ssa, "foobar", 1, 5, "ooba"},
+		{testStringSlice12_ssa, "foobar", 3, 3, ""},
+		{testStringSlice12_ssa, "", 0, 0, ""},
+	}
+
+	for i, t := range tests {
+		if got := t.fn(t.s, t.low, t.high); t.want != got {
+			println("#", i, " ", t.s, "[", t.low, ":", t.high, "] = ", got, " want ", t.want)
+			failed = true
+		}
+	}
+}
+
+type prefix struct {
+	prefix string
+}
+
+func (p *prefix) slice_ssa() {
+	p.prefix = p.prefix[:3]
+}
+
+func testStructSlice() {
+	switch {
+	}
+	p := &prefix{"prefix"}
+	p.slice_ssa()
+	if "pre" != p.prefix {
+		println("wrong field slice: wanted %s got %s", "pre", p.prefix)
+		failed = true
+	}
+}
+
+func testStringSlicePanic() {
+	defer func() {
+		if r := recover(); r != nil {
+			println("paniced as expected")
+		}
+	}()
+
+	str := "foobar"
+	println("got ", testStringSlice12_ssa(str, 3, 9))
+	println("expected to panic, but didn't")
+	failed = true
+}
+
+const _Accuracy_name = "BelowExactAbove"
+
+var _Accuracy_index = [...]uint8{0, 5, 10, 15}
+
+//go:noinline
+func testSmallIndexType_ssa(i int) string {
+	return _Accuracy_name[_Accuracy_index[i]:_Accuracy_index[i+1]]
+}
+
+func testSmallIndexType() {
+	tests := []struct {
+		i    int
+		want string
+	}{
+		{0, "Below"},
+		{1, "Exact"},
+		{2, "Above"},
+	}
+
+	for i, t := range tests {
+		if got := testSmallIndexType_ssa(t.i); got != t.want {
+			println("#", i, "got ", got, ", wanted", t.want)
+			failed = true
+		}
+	}
+}
+
+//go:noinline
+func testStringElem_ssa(s string, i int) byte {
+	return s[i]
+}
+
+func testStringElem() {
+	tests := []struct {
+		s string
+		i int
+		n byte
+	}{
+		{"foobar", 3, 98},
+		{"foobar", 0, 102},
+		{"foobar", 5, 114},
+	}
+	for _, t := range tests {
+		if got := testStringElem_ssa(t.s, t.i); got != t.n {
+			print("testStringElem \"", t.s, "\"[", t.i, "]=", got, ", wanted ", t.n, "\n")
+			failed = true
+		}
+	}
+}
+
+//go:noinline
+func testStringElemConst_ssa(i int) byte {
+	s := "foobar"
+	return s[i]
+}
+
+func testStringElemConst() {
+	if got := testStringElemConst_ssa(3); got != 98 {
+		println("testStringElemConst=", got, ", wanted 98")
+		failed = true
+	}
+}
+
+func main() {
+	testStringSlice()
+	testStringSlicePanic()
+	testStructSlice()
+	testSmallIndexType()
+	testStringElem()
+	testStringElemConst()
+
+	if failed {
+		panic("failed")
+	}
+}