blob: d7ebb1288eb820cce4d777e6d57af66b51301f52 [file] [log] [blame]
// run
// Copyright 2016 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.
// This test checks if the compiler's internal constant
// arithmetic correctly rounds denormal float32 values.
package main
import (
func main() {
for _, t := range []struct {
value float32
bits uint32
{0e+00, 0x00000000},
{1e-46, 0x00000000},
{0.5e-45, 0x00000000},
{0.8e-45, 0x00000001},
{1e-45, 0x00000001},
{2e-45, 0x00000001},
{3e-45, 0x00000002},
{4e-45, 0x00000003},
{5e-45, 0x00000004},
{6e-45, 0x00000004},
{7e-45, 0x00000005},
{8e-45, 0x00000006},
{9e-45, 0x00000006},
{1.0e-44, 0x00000007},
{1.1e-44, 0x00000008},
{1.2e-44, 0x00000009},
} {
got := math.Float32bits(t.value)
want := t.bits
if got != want {
panic(fmt.Sprintf("bits(%g) = 0x%08x; want 0x%08x", t.value, got, want))