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📄 README(205 B)
📄 abiutils_test.go(14.51 KB)
📄 abiutilsaux_test.go(3.24 KB)
📄 align_test.go(1.57 KB)
📄 bench_test.go(2.08 KB)
📄 clobberdead_test.go(1.25 KB)
📄 constFold_test.go(322.99 KB)
📄 dep_test.go(858 B)
📄 divconst_test.go(7.74 KB)
📄 fixedbugs_test.go(2.24 KB)
📄 float_test.go(12.48 KB)
📄 global_test.go(2.59 KB)
📄 iface_test.go(1.92 KB)
📄 inl_test.go(8.19 KB)
📄 inst_test.go(2.21 KB)
📄 intrinsics_test.go(1.08 KB)
📄 issue50182_test.go(1.24 KB)
📄 lang_test.go(1.47 KB)
📄 logic_test.go(11.08 KB)
📄 mulconst_test.go(4.29 KB)
📄 race.go(1.33 KB)
📄 reproduciblebuilds_test.go(2.9 KB)
📄 shift_test.go(21.62 KB)
📄 ssa_test.go(5.12 KB)
📄 switch_test.go(2.29 KB)
📄 test.go(13 B)
📁 testdata
📄 truncconst_test.go(1.76 KB)
📄 zerorange_test.go(4.06 KB)

Editing: mulconst_test.go

// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package test

import "testing"

// Benchmark multiplication of an integer by various constants.
//
// The comment above each sub-benchmark provides an example of how the
// target multiplication operation might be implemented using shift
// (multiplication by a power of 2), addition and subtraction
// operations. It is platform-dependent whether these transformations
// are actually applied.

var (
	mulSinkI32 int32
	mulSinkI64 int64
	mulSinkU32 uint32
	mulSinkU64 uint64
)

func BenchmarkMulconstI32(b *testing.B) {
	// 3x = 2x + x
	b.Run("3", func(b *testing.B) {
		x := int32(1)
		for i := 0; i < b.N; i++ {
			x *= 3
		}
		mulSinkI32 = x
	})
	// 5x = 4x + x
	b.Run("5", func(b *testing.B) {
		x := int32(1)
		for i := 0; i < b.N; i++ {
			x *= 5
		}
		mulSinkI32 = x
	})
	// 12x = 8x + 4x
	b.Run("12", func(b *testing.B) {
		x := int32(1)
		for i := 0; i < b.N; i++ {
			x *= 12
		}
		mulSinkI32 = x
	})
	// 120x = 128x - 8x
	b.Run("120", func(b *testing.B) {
		x := int32(1)
		for i := 0; i < b.N; i++ {
			x *= 120
		}
		mulSinkI32 = x
	})
	// -120x = 8x - 120x
	b.Run("-120", func(b *testing.B) {
		x := int32(1)
		for i := 0; i < b.N; i++ {
			x *= -120
		}
		mulSinkI32 = x
	})
	// 65537x = 65536x + x
	b.Run("65537", func(b *testing.B) {
		x := int32(1)
		for i := 0; i < b.N; i++ {
			x *= 65537
		}
		mulSinkI32 = x
	})
	// 65538x = 65536x + 2x
	b.Run("65538", func(b *testing.B) {
		x := int32(1)
		for i := 0; i < b.N; i++ {
			x *= 65538
		}
		mulSinkI32 = x
	})
}

func BenchmarkMulconstI64(b *testing.B) {
	// 3x = 2x + x
	b.Run("3", func(b *testing.B) {
		x := int64(1)
		for i := 0; i < b.N; i++ {
			x *= 3
		}
		mulSinkI64 = x
	})
	// 5x = 4x + x
	b.Run("5", func(b *testing.B) {
		x := int64(1)
		for i := 0; i < b.N; i++ {
			x *= 5
		}
		mulSinkI64 = x
	})
	// 12x = 8x + 4x
	b.Run("12", func(b *testing.B) {
		x := int64(1)
		for i := 0; i < b.N; i++ {
			x *= 12
		}
		mulSinkI64 = x
	})
	// 120x = 128x - 8x
	b.Run("120", func(b *testing.B) {
		x := int64(1)
		for i := 0; i < b.N; i++ {
			x *= 120
		}
		mulSinkI64 = x
	})
	// -120x = 8x - 120x
	b.Run("-120", func(b *testing.B) {
		x := int64(1)
		for i := 0; i < b.N; i++ {
			x *= -120
		}
		mulSinkI64 = x
	})
	// 65537x = 65536x + x
	b.Run("65537", func(b *testing.B) {
		x := int64(1)
		for i := 0; i < b.N; i++ {
			x *= 65537
		}
		mulSinkI64 = x
	})
	// 65538x = 65536x + 2x
	b.Run("65538", func(b *testing.B) {
		x := int64(1)
		for i := 0; i < b.N; i++ {
			x *= 65538
		}
		mulSinkI64 = x
	})
}

func BenchmarkMulconstU32(b *testing.B) {
	// 3x = 2x + x
	b.Run("3", func(b *testing.B) {
		x := uint32(1)
		for i := 0; i < b.N; i++ {
			x *= 3
		}
		mulSinkU32 = x
	})
	// 5x = 4x + x
	b.Run("5", func(b *testing.B) {
		x := uint32(1)
		for i := 0; i < b.N; i++ {
			x *= 5
		}
		mulSinkU32 = x
	})
	// 12x = 8x + 4x
	b.Run("12", func(b *testing.B) {
		x := uint32(1)
		for i := 0; i < b.N; i++ {
			x *= 12
		}
		mulSinkU32 = x
	})
	// 120x = 128x - 8x
	b.Run("120", func(b *testing.B) {
		x := uint32(1)
		for i := 0; i < b.N; i++ {
			x *= 120
		}
		mulSinkU32 = x
	})
	// 65537x = 65536x + x
	b.Run("65537", func(b *testing.B) {
		x := uint32(1)
		for i := 0; i < b.N; i++ {
			x *= 65537
		}
		mulSinkU32 = x
	})
	// 65538x = 65536x + 2x
	b.Run("65538", func(b *testing.B) {
		x := uint32(1)
		for i := 0; i < b.N; i++ {
			x *= 65538
		}
		mulSinkU32 = x
	})
}

func BenchmarkMulconstU64(b *testing.B) {
	// 3x = 2x + x
	b.Run("3", func(b *testing.B) {
		x := uint64(1)
		for i := 0; i < b.N; i++ {
			x *= 3
		}
		mulSinkU64 = x
	})
	// 5x = 4x + x
	b.Run("5", func(b *testing.B) {
		x := uint64(1)
		for i := 0; i < b.N; i++ {
			x *= 5
		}
		mulSinkU64 = x
	})
	// 12x = 8x + 4x
	b.Run("12", func(b *testing.B) {
		x := uint64(1)
		for i := 0; i < b.N; i++ {
			x *= 12
		}
		mulSinkU64 = x
	})
	// 120x = 128x - 8x
	b.Run("120", func(b *testing.B) {
		x := uint64(1)
		for i := 0; i < b.N; i++ {
			x *= 120
		}
		mulSinkU64 = x
	})
	// 65537x = 65536x + x
	b.Run("65537", func(b *testing.B) {
		x := uint64(1)
		for i := 0; i < b.N; i++ {
			x *= 65537
		}
		mulSinkU64 = x
	})
	// 65538x = 65536x + 2x
	b.Run("65538", func(b *testing.B) {
		x := uint64(1)
		for i := 0; i < b.N; i++ {
			x *= 65538
		}
		mulSinkU64 = x
	})
}

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Editing: mulconst_test.go

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