Update prebuilts to go1.9rc1 ab/4215840
Test: m -j blueprint_tools
Change-Id: I8ce0d15553d871a3e79dc5836260651c0e515b5c
diff --git a/src/runtime/iface_test.go b/src/runtime/iface_test.go
index 7f27baa..6d8f861 100644
--- a/src/runtime/iface_test.go
+++ b/src/runtime/iface_test.go
@@ -29,6 +29,20 @@
func (TL) Method1() {}
func (TL) Method2() {}
+type T8 uint8
+type T16 uint16
+type T32 uint32
+type T64 uint64
+type Tstr string
+type Tslice []byte
+
+func (T8) Method1() {}
+func (T16) Method1() {}
+func (T32) Method1() {}
+func (T64) Method1() {}
+func (Tstr) Method1() {}
+func (Tslice) Method1() {}
+
var (
e interface{}
e_ interface{}
@@ -261,3 +275,129 @@
t.Fatalf("want 0 allocs, got %v", n)
}
}
+
+func TestZeroConvT2x(t *testing.T) {
+ tests := []struct {
+ name string
+ fn func()
+ }{
+ {name: "E8", fn: func() { e = eight8 }}, // any byte-sized value does not allocate
+ {name: "E16", fn: func() { e = zero16 }}, // zero values do not allocate
+ {name: "E32", fn: func() { e = zero32 }},
+ {name: "E64", fn: func() { e = zero64 }},
+ {name: "Estr", fn: func() { e = zerostr }},
+ {name: "Eslice", fn: func() { e = zeroslice }},
+ {name: "Econstflt", fn: func() { e = 99.0 }}, // constants do not allocate
+ {name: "Econststr", fn: func() { e = "change" }},
+ {name: "I8", fn: func() { i1 = eight8I }},
+ {name: "I16", fn: func() { i1 = zero16I }},
+ {name: "I32", fn: func() { i1 = zero32I }},
+ {name: "I64", fn: func() { i1 = zero64I }},
+ {name: "Istr", fn: func() { i1 = zerostrI }},
+ {name: "Islice", fn: func() { i1 = zerosliceI }},
+ }
+
+ for _, test := range tests {
+ t.Run(test.name, func(t *testing.T) {
+ n := testing.AllocsPerRun(1000, test.fn)
+ if n != 0 {
+ t.Errorf("want zero allocs, got %v", n)
+ }
+ })
+ }
+}
+
+var (
+ eight8 uint8 = 8
+ eight8I T8 = 8
+
+ zero16 uint16 = 0
+ zero16I T16 = 0
+ one16 uint16 = 1
+
+ zero32 uint32 = 0
+ zero32I T32 = 0
+ one32 uint32 = 1
+
+ zero64 uint64 = 0
+ zero64I T64 = 0
+ one64 uint64 = 1
+
+ zerostr string = ""
+ zerostrI Tstr = ""
+ nzstr string = "abc"
+
+ zeroslice []byte = nil
+ zerosliceI Tslice = nil
+ nzslice []byte = []byte("abc")
+
+ zerobig [512]byte
+ nzbig [512]byte = [512]byte{511: 1}
+)
+
+func BenchmarkConvT2Ezero(b *testing.B) {
+ b.Run("zero", func(b *testing.B) {
+ b.Run("16", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = zero16
+ }
+ })
+ b.Run("32", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = zero32
+ }
+ })
+ b.Run("64", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = zero64
+ }
+ })
+ b.Run("str", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = zerostr
+ }
+ })
+ b.Run("slice", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = zeroslice
+ }
+ })
+ b.Run("big", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = zerobig
+ }
+ })
+ })
+ b.Run("nonzero", func(b *testing.B) {
+ b.Run("16", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = one16
+ }
+ })
+ b.Run("32", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = one32
+ }
+ })
+ b.Run("64", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = one64
+ }
+ })
+ b.Run("str", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = nzstr
+ }
+ })
+ b.Run("slice", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = nzslice
+ }
+ })
+ b.Run("big", func(b *testing.B) {
+ for i := 0; i < b.N; i++ {
+ e = nzbig
+ }
+ })
+ })
+}
