golang float_test 代码
文件路径：/src/runtime/float_test.go
/ Copyright 2021 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"
)
func TestIssue48807(t *testing.T) {
for _, i := range []uint64{
0x8234508000000001, / from issue48807
1<<56 + 1<<32 + 1,
} {
got := float32(i)
dontwant := float32(float64(i))
if got == dontwant {
/ The test cases above should be uint64s such that
/ this equality doesn't hold. These examples trigger
/ the case where using an intermediate float64 doesn't work.
t.Errorf("direct float32 conversion doesn't work: arg=%x got=%x dontwant=%x", i, got, dontwant)
}
}
}