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b3be360f16
Extend escape analysis to make(map[k]v). If it does not escape, allocate temp buffer for hmap and one bucket on stack. There are 75 cases of non-escaping maps in std lib. benchmark old allocs new allocs delta BenchmarkConcurrentStmtQuery 16161 15161 -6.19% BenchmarkConcurrentTxQuery 17658 16658 -5.66% BenchmarkConcurrentTxStmtQuery 16157 15156 -6.20% BenchmarkConcurrentRandom 13637 13114 -3.84% BenchmarkManyConcurrentQueries 22 20 -9.09% BenchmarkDecodeComplex128Slice 250 188 -24.80% BenchmarkDecodeFloat64Slice 250 188 -24.80% BenchmarkDecodeInt32Slice 250 188 -24.80% BenchmarkDecodeStringSlice 2250 2188 -2.76% BenchmarkNewEmptyMap 1 0 -100.00% BenchmarkNewSmallMap 2 0 -100.00% benchmark old ns/op new ns/op delta BenchmarkNewEmptyMap 124 55.7 -55.08% BenchmarkNewSmallMap 317 148 -53.31% benchmark old allocs new allocs delta BenchmarkNewEmptyMap 1 0 -100.00% BenchmarkNewSmallMap 2 0 -100.00% benchmark old bytes new bytes delta BenchmarkNewEmptyMap 48 0 -100.00% BenchmarkNewSmallMap 192 0 -100.00% Fixes #5449 Change-Id: I24fa66f949d2f138885d9e66a0d160240dc9e8fa Reviewed-on: https://go-review.googlesource.com/3508 Reviewed-by: Keith Randall <khr@golang.org> Run-TryBot: Dmitry Vyukov <dvyukov@google.com>
40 lines
914 B
Go
40 lines
914 B
Go
// errorcheck -0 -live -wb=0
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// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// liveness tests with inlining ENABLED
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// see also live.go.
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package main
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// issue 8142: lost 'addrtaken' bit on inlined variables.
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// no inlining in this test, so just checking that non-inlined works.
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func printnl()
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type T40 struct {
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m map[int]int
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}
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func newT40() *T40 {
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ret := T40{}
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ret.m = make(map[int]int) // ERROR "live at call to makemap: &ret"
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return &ret
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}
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func bad40() {
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t := newT40() // ERROR "live at call to makemap: autotmp_.* ret"
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printnl() // ERROR "live at call to printnl: autotmp_.* ret"
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_ = t
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}
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func good40() {
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ret := T40{}
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ret.m = make(map[int]int) // ERROR "live at call to makemap: autotmp_.* ret"
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t := &ret
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printnl() // ERROR "live at call to printnl: autotmp_.* ret"
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_ = t
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}
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