copyelim_test.go

     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  	"cmd/compile/internal/types"
     9  	"fmt"
    10  	"testing"
    11  )
    12  
    13  func BenchmarkCopyElim1(b *testing.B)      { benchmarkCopyElim(b, 1) }
    14  func BenchmarkCopyElim10(b *testing.B)     { benchmarkCopyElim(b, 10) }
    15  func BenchmarkCopyElim100(b *testing.B)    { benchmarkCopyElim(b, 100) }
    16  func BenchmarkCopyElim1000(b *testing.B)   { benchmarkCopyElim(b, 1000) }
    17  func BenchmarkCopyElim10000(b *testing.B)  { benchmarkCopyElim(b, 10000) }
    18  func BenchmarkCopyElim100000(b *testing.B) { benchmarkCopyElim(b, 100000) }
    19  
    20  func benchmarkCopyElim(b *testing.B, n int) {
    21  	c := testConfig(b)
    22  
    23  	values := make([]interface{}, 0, n+2)
    24  	values = append(values, Valu("mem", OpInitMem, types.TypeMem, 0, nil))
    25  	last := "mem"
    26  	for i := 0; i < n; i++ {
    27  		name := fmt.Sprintf("copy%d", i)
    28  		values = append(values, Valu(name, OpCopy, types.TypeMem, 0, nil, last))
    29  		last = name
    30  	}
    31  	values = append(values, Exit(last))
    32  	// Reverse values array to make it hard
    33  	for i := 0; i < len(values)/2; i++ {
    34  		values[i], values[len(values)-1-i] = values[len(values)-1-i], values[i]
    35  	}
    36  
    37  	for i := 0; i < b.N; i++ {
    38  		fun := c.Fun("entry", Bloc("entry", values...))
    39  		Copyelim(fun.f)
    40  	}
    41  }
    42
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