1// Copyright 2021 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
5package runtime_test
6
7import (
8	"testing"
9)
10
11func TestIssue48807(t *testing.T) {
12	for _, i := range []uint64{
13		0x8234508000000001, // from issue48807
14		1<<56 + 1<<32 + 1,
15	} {
16		got := float32(i)
17		dontwant := float32(float64(i))
18		if got == dontwant {
19			// The test cases above should be uint64s such that
20			// this equality doesn't hold. These examples trigger
21			// the case where using an intermediate float64 doesn't work.
22			t.Errorf("direct float32 conversion doesn't work: arg=%x got=%x dontwant=%x", i, got, dontwant)
23		}
24	}
25}
26