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 ssacompile
     6  
     7  import (
     8  	"fmt"
     9  	"testing"
    10  
    11  	"cmd/compile/internal/ssa/ssaop"
    12  	"cmd/compile/internal/types"
    13  )
    14  
    15  func BenchmarkCopyElim1(b *testing.B)      { benchmarkCopyElim(b, 1) }
    16  func BenchmarkCopyElim10(b *testing.B)     { benchmarkCopyElim(b, 10) }
    17  func BenchmarkCopyElim100(b *testing.B)    { benchmarkCopyElim(b, 100) }
    18  func BenchmarkCopyElim1000(b *testing.B)   { benchmarkCopyElim(b, 1000) }
    19  func BenchmarkCopyElim10000(b *testing.B)  { benchmarkCopyElim(b, 10000) }
    20  func BenchmarkCopyElim100000(b *testing.B) { benchmarkCopyElim(b, 100000) }
    21  
    22  func benchmarkCopyElim(b *testing.B, n int) {
    23  	c := testConfig(b)
    24  
    25  	values := make([]any, 0, n+2)
    26  	values = append(values, Valu("mem", ssaop.OpInitMem, types.TypeMem, 0, nil))
    27  	last := "mem"
    28  	for i := 0; i < n; i++ {
    29  		name := fmt.Sprintf("copy%d", i)
    30  		values = append(values, Valu(name, ssaop.OpCopy, types.TypeMem, 0, nil, last))
    31  		last = name
    32  	}
    33  	values = append(values, Exit(last))
    34  	// Reverse values array to make it hard
    35  	for i := 0; i < len(values)/2; i++ {
    36  		values[i], values[len(values)-1-i] = values[len(values)-1-i], values[i]
    37  	}
    38  
    39  	for i := 0; i < b.N; i++ {
    40  		fun := c.Fun("entry", Bloc("entry", values...))
    41  		Copyelim(fun.f)
    42  	}
    43  }
    44
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