From c7873ff2a64982a4fa4f3c9177d4ec80f66e7db6 Mon Sep 17 00:00:00 2001
From: Ryan Hitchman <hitchmanr@gmail.com>
Date: Thu, 1 Nov 2012 13:57:24 -0400
Subject: [PATCH] compress/flate: shrink decompressor struct for better
 performance

Helps with issue 2703.

R=dave, minux.ma, rsc
CC=golang-dev
https://golang.org/cl/5536078
---
 src/pkg/compress/flate/inflate.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/pkg/compress/flate/inflate.go b/src/pkg/compress/flate/inflate.go
index c7ef5ff7e60..c5a54b998fa 100644
--- a/src/pkg/compress/flate/inflate.go
+++ b/src/pkg/compress/flate/inflate.go
@@ -208,8 +208,8 @@ type decompressor struct {
 	h1, h2 huffmanDecoder
 
 	// Length arrays used to define Huffman codes.
-	bits     [maxLit + maxDist]int
-	codebits [numCodes]int
+	bits     *[maxLit + maxDist]int
+	codebits *[numCodes]int
 
 	// Output history, buffer.
 	hist  *[maxHist]byte
@@ -692,6 +692,8 @@ func makeReader(r io.Reader) Reader {
 // finished reading.
 func NewReader(r io.Reader) io.ReadCloser {
 	var f decompressor
+	f.bits = new([maxLit + maxDist]int)
+	f.codebits = new([numCodes]int)
 	f.r = makeReader(r)
 	f.hist = new([maxHist]byte)
 	f.step = (*decompressor).nextBlock
@@ -707,6 +709,8 @@ func NewReaderDict(r io.Reader, dict []byte) io.ReadCloser {
 	var f decompressor
 	f.r = makeReader(r)
 	f.hist = new([maxHist]byte)
+	f.bits = new([maxLit + maxDist]int)
+	f.codebits = new([numCodes]int)
 	f.step = (*decompressor).nextBlock
 	f.setDict(dict)
 	return &f