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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build 386 || arm || mips || ppc
package utils
import (
"math"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestMul_32bit(t *testing.T) {
// These constants are smaller in magnitude than the exact square root.
assert.Greater(t, sqrtMinInt, int(math.Sqrt(math.MinInt32)))
assert.Less(t, sqrtMaxInt, int(math.Sqrt(math.MaxInt32)))
for _, tt := range []struct {
a, b, expected int
ok bool
}{
{ok: true, a: math.MinInt16, b: 0, expected: 0},
{ok: true, a: math.MinInt16, b: 1, expected: math.MinInt16},
{ok: true, a: math.MinInt16, b: -1, expected: -math.MinInt16},
{ok: true, a: math.MaxInt16, b: 0, expected: 0},
{ok: true, a: math.MaxInt16, b: 1, expected: math.MaxInt16},
{ok: true, a: math.MaxInt16, b: -1, expected: -math.MaxInt16},
{ok: true, a: math.MinInt16, b: math.MinInt16, expected: 1073741824},
{ok: true, a: math.MaxInt16, b: math.MaxInt16, expected: 1073676289},
{ok: true, a: math.MinInt16, b: math.MaxInt16, expected: -1073709056},
{ok: true, a: math.MaxInt16, b: math.MinInt16, expected: -1073709056},
{ok: true, a: math.MinInt32, b: 0, expected: 0},
{ok: true, a: math.MinInt32, b: 1, expected: math.MinInt32},
{ok: false, a: math.MinInt32, b: -1, expected: math.MinInt32},
{ok: false, a: math.MinInt32, b: -2, expected: 0},
{ok: false, a: math.MinInt32, b: 2, expected: 0},
{ok: true, a: math.MaxInt32, b: 0, expected: 0},
{ok: true, a: math.MaxInt32, b: 1, expected: math.MaxInt32},
{ok: true, a: math.MaxInt32, b: -1, expected: -math.MaxInt32},
{ok: false, a: math.MaxInt32, b: -2, expected: 2},
{ok: false, a: math.MaxInt32, b: 2, expected: -2},
} {
actual, ok := Mul(tt.a, tt.b)
assert.Equal(t, tt.ok, ok, "(%v + %v)", tt.a, tt.b)
require.Equal(t, tt.expected, actual, "(%v + %v)", tt.a, tt.b)
}
}
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