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c12e1b0b2e
This makes the rounding bug fix in math/big for issue 14651 available to the compiler. - changes to cmd/compile/internal/big fully automatic via script - added test case for issue - updated old test case with correct test data Fixes #14651. Change-Id: Iea37a2cd8d3a75f8c96193748b66156a987bbe40 Reviewed-on: https://go-review.googlesource.com/20818 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
46 lines
940 B
Go
46 lines
940 B
Go
// run
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// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// This test checks if the compiler's internal constant
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// arithmetic correctly rounds denormal float32 values.
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package main
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import (
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"fmt"
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"math"
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)
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func main() {
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for _, t := range []struct {
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value float32
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bits uint32
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}{
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{0e+00, 0x00000000},
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{1e-46, 0x00000000},
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{0.5e-45, 0x00000000},
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{0.8e-45, 0x00000001},
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{1e-45, 0x00000001},
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{2e-45, 0x00000001},
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{3e-45, 0x00000002},
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{4e-45, 0x00000003},
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{5e-45, 0x00000004},
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{6e-45, 0x00000004},
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{7e-45, 0x00000005},
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{8e-45, 0x00000006},
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{9e-45, 0x00000006},
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{1.0e-44, 0x00000007},
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{1.1e-44, 0x00000008},
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{1.2e-44, 0x00000009},
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} {
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got := math.Float32bits(t.value)
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want := t.bits
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if got != want {
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panic(fmt.Sprintf("bits(%g) = 0x%08x; want 0x%08x", t.value, got, want))
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}
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}
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}
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