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// 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 runtime_test
import (
"testing"
)
var res int64
var ures uint64
func TestFloatTruncation(t *testing.T) {
testdata := []struct {
input float64
convInt64 int64
convUInt64 uint64
overflow bool
}{
// max +- 1
{
input: 0x7fffffffffffffff,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
// For out-of-bounds conversion, the result is implementation-dependent.
// This test verifies the implementation of wasm architecture.
{
input: 0x8000000000000000,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
{
input: 0x7ffffffffffffffe,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
// neg max +- 1
{
input: -0x8000000000000000,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
{
input: -0x8000000000000001,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
{
input: -0x7fffffffffffffff,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
// trunc point +- 1
{
input: 0x7ffffffffffffdff,
convInt64: 0x7ffffffffffffc00,
convUInt64: 0x7ffffffffffffc00,
},
{
input: 0x7ffffffffffffe00,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
{
input: 0x7ffffffffffffdfe,
convInt64: 0x7ffffffffffffc00,
convUInt64: 0x7ffffffffffffc00,
},
// neg trunc point +- 1
{
input: -0x7ffffffffffffdff,
convInt64: -0x7ffffffffffffc00,
convUInt64: 0x8000000000000000,
},
{
input: -0x7ffffffffffffe00,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
{
input: -0x7ffffffffffffdfe,
convInt64: -0x7ffffffffffffc00,
convUInt64: 0x8000000000000000,
},
// umax +- 1
{
input: 0xffffffffffffffff,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
{
input: 0x10000000000000000,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
{
input: 0xfffffffffffffffe,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
// umax trunc +- 1
{
input: 0xfffffffffffffbff,
convInt64: -0x8000000000000000,
convUInt64: 0xfffffffffffff800,
},
{
input: 0xfffffffffffffc00,
convInt64: -0x8000000000000000,
convUInt64: 0x8000000000000000,
},
{
input: 0xfffffffffffffbfe,
convInt64: -0x8000000000000000,
convUInt64: 0xfffffffffffff800,
},
}
for _, item := range testdata {
if got, want := int64(item.input), item.convInt64; got != want {
t.Errorf("int64(%f): got %x, want %x", item.input, got, want)
}
if got, want := uint64(item.input), item.convUInt64; got != want {
t.Errorf("uint64(%f): got %x, want %x", item.input, got, want)
}
}
}