encoding/binary: simplify Read and Write

There's no need to manually manage the backing slice for bs.
Removing it simplifies the code, removes some allocations,
and speeds it up slightly.

Fixes #27403

name                     old time/op    new time/op    delta
ReadSlice1000Int32s-8      6.39µs ± 1%    6.31µs ± 1%   -1.37%  (p=0.000 n=27+27)
ReadStruct-8               1.25µs ± 2%    1.23µs ± 2%   -1.06%  (p=0.003 n=30+29)
ReadInts-8                  301ns ± 0%     297ns ± 1%   -1.21%  (p=0.000 n=27+30)
WriteInts-8                 325ns ± 1%     320ns ± 1%   -1.59%  (p=0.000 n=26+29)
WriteSlice1000Int32s-8     6.60µs ± 0%    6.52µs ± 0%   -1.23%  (p=0.000 n=28+27)
PutUint16-8                0.72ns ± 2%    0.71ns ± 2%     ~     (p=0.286 n=30+30)
PutUint32-8                0.71ns ± 1%    0.71ns ± 0%   -0.42%  (p=0.003 n=30+25)
PutUint64-8                0.78ns ± 2%    0.78ns ± 0%   -0.55%  (p=0.001 n=30+27)
LittleEndianPutUint16-8    0.57ns ± 0%    0.57ns ± 0%     ~     (all equal)
LittleEndianPutUint32-8    0.57ns ± 0%    0.57ns ± 0%     ~     (all equal)
LittleEndianPutUint64-8    0.57ns ± 0%    0.57ns ± 0%     ~     (all equal)
PutUvarint32-8             23.1ns ± 1%    23.1ns ± 1%     ~     (p=0.925 n=26+29)
PutUvarint64-8             57.5ns ± 2%    57.3ns ± 1%     ~     (p=0.338 n=30+26)
[Geo mean]                 23.0ns         22.9ns        -0.61%

name                     old speed      new speed      delta
ReadSlice1000Int32s-8     626MB/s ± 1%   634MB/s ± 1%   +1.38%  (p=0.000 n=27+27)
ReadStruct-8             60.2MB/s ± 2%  60.8MB/s ± 2%   +1.08%  (p=0.002 n=30+29)
ReadInts-8                100MB/s ± 1%   101MB/s ± 1%   +1.24%  (p=0.000 n=27+30)
WriteInts-8              92.2MB/s ± 1%  93.6MB/s ± 1%   +1.56%  (p=0.000 n=26+29)
WriteSlice1000Int32s-8    606MB/s ± 0%   614MB/s ± 0%   +1.24%  (p=0.000 n=28+27)
PutUint16-8              2.80GB/s ± 1%  2.80GB/s ± 1%     ~     (p=0.095 n=28+29)
PutUint32-8              5.61GB/s ± 1%  5.62GB/s ± 1%     ~     (p=0.069 n=27+28)
PutUint64-8              10.2GB/s ± 1%  10.2GB/s ± 0%   +0.15%  (p=0.039 n=27+27)
LittleEndianPutUint16-8  3.50GB/s ± 1%  3.50GB/s ± 1%     ~     (p=0.552 n=30+29)
LittleEndianPutUint32-8  7.01GB/s ± 1%  7.02GB/s ± 1%     ~     (p=0.160 n=29+27)
LittleEndianPutUint64-8  14.0GB/s ± 1%  14.0GB/s ± 1%     ~     (p=0.413 n=29+29)
PutUvarint32-8            174MB/s ± 1%   173MB/s ± 1%     ~     (p=0.648 n=25+30)
PutUvarint64-8            139MB/s ± 2%   140MB/s ± 1%     ~     (p=0.271 n=30+26)
[Geo mean]                906MB/s        911MB/s        +0.55%

name                     old alloc/op   new alloc/op   delta
ReadSlice1000Int32s-8      4.14kB ± 0%    4.13kB ± 0%   -0.19%  (p=0.000 n=30+30)
ReadStruct-8                 200B ± 0%      200B ± 0%     ~     (all equal)
ReadInts-8                  64.0B ± 0%     32.0B ± 0%  -50.00%  (p=0.000 n=30+30)
WriteInts-8                  112B ± 0%       64B ± 0%  -42.86%  (p=0.000 n=30+30)
WriteSlice1000Int32s-8     4.14kB ± 0%    4.13kB ± 0%   -0.19%  (p=0.000 n=30+30)
PutUint16-8                 0.00B          0.00B          ~     (all equal)
PutUint32-8                 0.00B          0.00B          ~     (all equal)
PutUint64-8                 0.00B          0.00B          ~     (all equal)
LittleEndianPutUint16-8     0.00B          0.00B          ~     (all equal)
LittleEndianPutUint32-8     0.00B          0.00B          ~     (all equal)
LittleEndianPutUint64-8     0.00B          0.00B          ~     (all equal)
PutUvarint32-8              0.00B          0.00B          ~     (all equal)
PutUvarint64-8              0.00B          0.00B          ~     (all equal)
[Geo mean]                   476B           370B       -22.22%

name                     old allocs/op  new allocs/op  delta
ReadSlice1000Int32s-8        3.00 ± 0%      2.00 ± 0%  -33.33%  (p=0.000 n=30+30)
ReadStruct-8                 16.0 ± 0%      16.0 ± 0%     ~     (all equal)
ReadInts-8                   8.00 ± 0%      8.00 ± 0%     ~     (all equal)
WriteInts-8                  14.0 ± 0%      14.0 ± 0%     ~     (all equal)
WriteSlice1000Int32s-8       3.00 ± 0%      2.00 ± 0%  -33.33%  (p=0.000 n=30+30)
PutUint16-8                  0.00           0.00          ~     (all equal)
PutUint32-8                  0.00           0.00          ~     (all equal)
PutUint64-8                  0.00           0.00          ~     (all equal)
LittleEndianPutUint16-8      0.00           0.00          ~     (all equal)
LittleEndianPutUint32-8      0.00           0.00          ~     (all equal)
LittleEndianPutUint64-8      0.00           0.00          ~     (all equal)
PutUvarint32-8               0.00           0.00          ~     (all equal)
PutUvarint64-8               0.00           0.00          ~     (all equal)
[Geo mean]                   6.94           5.90       -14.97%

Change-Id: I3790b93e4190d98621d5f2c47e42929a18f56c2e
Reviewed-on: https://go-review.googlesource.com/133135
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1 files changed, 14 insertions, 26 deletions

diff --git a/src/encoding/binary/binary.go b/src/encoding/binary/binary.go
index 85b3bc2295..8c2d1d9da4 100644
--- a/src/encoding/binary/binary.go
+++ b/src/encoding/binary/binary.go
@@ -161,23 +161,17 @@ func (bigEndian) GoString() string { return "binary.BigEndian" }
 func Read(r io.Reader, order ByteOrder, data interface{}) error {
 	// Fast path for basic types and slices.
 	if n := intDataSize(data); n != 0 {
-		var b [8]byte
-		var bs []byte
-		if n > len(b) {
-			bs = make([]byte, n)
-		} else {
-			bs = b[:n]
-		}
+		bs := make([]byte, n)
 		if _, err := io.ReadFull(r, bs); err != nil {
 			return err
 		}
 		switch data := data.(type) {
 		case *bool:
-			*data = b[0] != 0
+			*data = bs[0] != 0
 		case *int8:
-			*data = int8(b[0])
+			*data = int8(bs[0])
 		case *uint8:
-			*data = b[0]
+			*data = bs[0]
 		case *int16:
 			*data = int16(order.Uint16(bs))
 		case *uint16:
@@ -260,25 +254,19 @@ func Read(r io.Reader, order ByteOrder, data interface{}) error {
 func Write(w io.Writer, order ByteOrder, data interface{}) error {
 	// Fast path for basic types and slices.
 	if n := intDataSize(data); n != 0 {
-		var b [8]byte
-		var bs []byte
-		if n > len(b) {
-			bs = make([]byte, n)
-		} else {
-			bs = b[:n]
-		}
+		bs := make([]byte, n)
 		switch v := data.(type) {
 		case *bool:
 			if *v {
-				b[0] = 1
+				bs[0] = 1
 			} else {
-				b[0] = 0
+				bs[0] = 0
 			}
 		case bool:
 			if v {
-				b[0] = 1
+				bs[0] = 1
 			} else {
-				b[0] = 0
+				bs[0] = 0
 			}
 		case []bool:
 			for i, x := range v {
@@ -289,19 +277,19 @@ func Write(w io.Writer, order ByteOrder, data interface{}) error {
 				}
 			}
 		case *int8:
-			b[0] = byte(*v)
+			bs[0] = byte(*v)
 		case int8:
-			b[0] = byte(v)
+			bs[0] = byte(v)
 		case []int8:
 			for i, x := range v {
 				bs[i] = byte(x)
 			}
 		case *uint8:
-			b[0] = *v
+			bs[0] = *v
 		case uint8:
-			b[0] = v
+			bs[0] = v
 		case []uint8:
-			bs = v
+			bs = v // TODO(josharian): avoid allocating bs in this case?
 		case *int16:
 			order.PutUint16(bs, uint16(*v))
 		case int16: