github.com/mh-cbon/go@v0.0.0-20160603070303-9e112a3fe4c0/src/cmd/compile/internal/ssa/copyelim_test.go (about)

     1  // Copyright 2016 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package ssa
     6  
     7  import (
     8  	"fmt"
     9  	"testing"
    10  )
    11  
    12  func BenchmarkCopyElim1(b *testing.B)      { benchmarkCopyElim(b, 1) }
    13  func BenchmarkCopyElim10(b *testing.B)     { benchmarkCopyElim(b, 10) }
    14  func BenchmarkCopyElim100(b *testing.B)    { benchmarkCopyElim(b, 100) }
    15  func BenchmarkCopyElim1000(b *testing.B)   { benchmarkCopyElim(b, 1000) }
    16  func BenchmarkCopyElim10000(b *testing.B)  { benchmarkCopyElim(b, 10000) }
    17  func BenchmarkCopyElim100000(b *testing.B) { benchmarkCopyElim(b, 100000) }
    18  
    19  func benchmarkCopyElim(b *testing.B, n int) {
    20  	c := testConfig(b)
    21  
    22  	values := make([]interface{}, 0, n+2)
    23  	values = append(values, Valu("mem", OpInitMem, TypeMem, 0, nil))
    24  	last := "mem"
    25  	for i := 0; i < n; i++ {
    26  		name := fmt.Sprintf("copy%d", i)
    27  		values = append(values, Valu(name, OpCopy, TypeMem, 0, nil, last))
    28  		last = name
    29  	}
    30  	values = append(values, Exit(last))
    31  	// Reverse values array to make it hard
    32  	for i := 0; i < len(values)/2; i++ {
    33  		values[i], values[len(values)-1-i] = values[len(values)-1-i], values[i]
    34  	}
    35  
    36  	for i := 0; i < b.N; i++ {
    37  		fun := Fun(c, "entry", Bloc("entry", values...))
    38  		Copyelim(fun.f)
    39  		fun.f.Free()
    40  	}
    41  }