libgo, compiler: Upgrade libgo to Go 1.4, except for runtime.

This upgrades all of libgo other than the runtime package to
the Go 1.4 release.  In Go 1.4 much of the runtime was
rewritten into Go.  Merging that code will take more time and
will not change the API, so I'm putting it off for now.

There are a few runtime changes anyhow, to accomodate other
packages that rely on minor modifications to the runtime
support.

The compiler changes slightly to add a one-bit flag to each
type descriptor kind that is stored directly in an interface,
which for gccgo is currently only pointer types.  Another
one-bit flag (gcprog) is reserved because it is used by the gc
compiler, but gccgo does not currently use it.

There is another error check in the compiler since I ran
across it during testing.

gotools/:
	* Makefile.am (go_cmd_go_files): Sort entries.  Add generate.go.
	* Makefile.in: Rebuild.

From-SVN: r219627

2 files changed, 28 insertions, 14 deletions

diff --git a/libgo/go/encoding/base64/base64.go b/libgo/go/encoding/base64/base64.go
index e38c26d..ad3abe6 100644
--- a/libgo/go/encoding/base64/base64.go
+++ b/libgo/go/encoding/base64/base64.go
@@ -74,31 +74,29 @@ func (enc *Encoding) Encode(dst, src []byte) {
 	}
 
 	for len(src) > 0 {
-		dst[0] = 0
-		dst[1] = 0
-		dst[2] = 0
-		dst[3] = 0
+		var b0, b1, b2, b3 byte
 
 		// Unpack 4x 6-bit source blocks into a 4 byte
 		// destination quantum
 		switch len(src) {
 		default:
-			dst[3] |= src[2] & 0x3F
-			dst[2] |= src[2] >> 6
+			b3 = src[2] & 0x3F
+			b2 = src[2] >> 6
 			fallthrough
 		case 2:
-			dst[2] |= (src[1] << 2) & 0x3F
-			dst[1] |= src[1] >> 4
+			b2 |= (src[1] << 2) & 0x3F
+			b1 = src[1] >> 4
 			fallthrough
 		case 1:
-			dst[1] |= (src[0] << 4) & 0x3F
-			dst[0] |= src[0] >> 2
+			b1 |= (src[0] << 4) & 0x3F
+			b0 = src[0] >> 2
 		}
 
 		// Encode 6-bit blocks using the base64 alphabet
-		for j := 0; j < 4; j++ {
-			dst[j] = enc.encode[dst[j]]
-		}
+		dst[0] = enc.encode[b0]
+		dst[1] = enc.encode[b1]
+		dst[2] = enc.encode[b2]
+		dst[3] = enc.encode[b3]
 
 		// Pad the final quantum
 		if len(src) < 3 {
@@ -295,7 +293,7 @@ func (enc *Encoding) Decode(dst, src []byte) (n int, err error) {
 func (enc *Encoding) DecodeString(s string) ([]byte, error) {
 	s = strings.Map(removeNewlinesMapper, s)
 	dbuf := make([]byte, enc.DecodedLen(len(s)))
-	n, err := enc.Decode(dbuf, []byte(s))
+	n, _, err := enc.decode(dbuf, []byte(s))
 	return dbuf[:n], err
 }
 
diff --git a/libgo/go/encoding/base64/base64_test.go b/libgo/go/encoding/base64/base64_test.go
index a075194..7d199bf 100644
--- a/libgo/go/encoding/base64/base64_test.go
+++ b/libgo/go/encoding/base64/base64_test.go
@@ -342,3 +342,19 @@ func TestDecoderIssue7733(t *testing.T) {
 		t.Errorf("DecodeString = %q; want abcd", s)
 	}
 }
+
+func BenchmarkEncodeToString(b *testing.B) {
+	data := make([]byte, 8192)
+	b.SetBytes(int64(len(data)))
+	for i := 0; i < b.N; i++ {
+		StdEncoding.EncodeToString(data)
+	}
+}
+
+func BenchmarkDecodeString(b *testing.B) {
+	data := StdEncoding.EncodeToString(make([]byte, 8192))
+	b.SetBytes(int64(len(data)))
+	for i := 0; i < b.N; i++ {
+		StdEncoding.DecodeString(data)
+	}
+}