Sofia Papagiannaki
fc08c26025
* WIP: Spawn backend plugins v2 * Add test for plugin version * Fix support for SDK plugins Co-authored-by: Kyle Brandt <kyle@kbrandt.com> Co-authored-by: Marcus Olsson <olsson.e.marcus@gmail.com> Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com> * WIP: Draft PR for fork of V2 sdk / bi-directional support (#19890) * temporary use export-datasource-plugin branch of grafana-plugin-sdk * fix failing test * remove debug (spew) lines * misc cleanup * add expressions feature toggle * use latest grafana-plugin-sdk-go
71 lines
2.0 KiB
Go
71 lines
2.0 KiB
Go
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package float16 // import "github.com/apache/arrow/go/arrow/float16"
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import (
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"math"
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"strconv"
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)
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// Num represents a half-precision floating point value (float16)
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// stored on 16 bits.
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//
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// See https://en.wikipedia.org/wiki/Half-precision_floating-point_format for more informations.
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type Num struct {
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bits uint16
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}
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// New creates a new half-precision floating point value from the provided
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// float32 value.
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func New(f float32) Num {
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b := math.Float32bits(f)
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sn := uint16((b >> 31) & 0x1)
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exp := (b >> 23) & 0xff
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res := int16(exp) - 127 + 15
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fc := uint16(b>>13) & 0x3ff
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switch {
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case exp == 0:
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res = 0
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case exp == 0xff:
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res = 0x1f
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case res > 0x1e:
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res = 0x1f
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fc = 0
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case res < 0x01:
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res = 0
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fc = 0
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}
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return Num{bits: (sn << 15) | uint16(res<<10) | fc}
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}
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func (f Num) Float32() float32 {
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sn := uint32((f.bits >> 15) & 0x1)
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exp := (f.bits >> 10) & 0x1f
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res := uint32(exp) + 127 - 15
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fc := uint32(f.bits & 0x3ff)
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switch {
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case exp == 0:
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res = 0
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case exp == 0x1f:
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res = 0xff
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}
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return math.Float32frombits((sn << 31) | (res << 23) | (fc << 13))
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}
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func (f Num) Uint16() uint16 { return f.bits }
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func (f Num) String() string { return strconv.FormatFloat(float64(f.Float32()), 'g', -1, 32) }
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