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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package utils
import (
"math"
)
// this file contains pure go implementations of the min_max functions that are
// SIMD accelerated so that we can fallback to these if the cpu doesn't support
// AVX2 or SSE4 instructions.
func int8MinMax(values []int8) (min, max int8) {
min = math.MaxInt8
max = math.MinInt8
for _, v := range values {
if min > v {
min = v
}
if max < v {
max = v
}
}
return
}
func uint8MinMax(values []uint8) (min, max uint8) {
min = math.MaxUint8
max = 0
for _, v := range values {
if min > v {
min = v
}
if max < v {
max = v
}
}
return
}
func int16MinMax(values []int16) (min, max int16) {
min = math.MaxInt16
max = math.MinInt16
for _, v := range values {
if min > v {
min = v
}
if max < v {
max = v
}
}
return
}
func uint16MinMax(values []uint16) (min, max uint16) {
min = math.MaxUint16
max = 0
for _, v := range values {
if min > v {
min = v
}
if max < v {
max = v
}
}
return
}
func int32MinMax(values []int32) (min, max int32) {
min = math.MaxInt32
max = math.MinInt32
for _, v := range values {
if min > v {
min = v
}
if max < v {
max = v
}
}
return
}
func uint32MinMax(values []uint32) (min, max uint32) {
min = math.MaxUint32
max = 0
for _, v := range values {
if min > v {
min = v
}
if max < v {
max = v
}
}
return
}
func int64MinMax(values []int64) (min, max int64) {
min = math.MaxInt64
max = math.MinInt64
for _, v := range values {
if min > v {
min = v
}
if max < v {
max = v
}
}
return
}
func uint64MinMax(values []uint64) (min, max uint64) {
min = math.MaxUint64
max = 0
for _, v := range values {
if min > v {
min = v
}
if max < v {
max = v
}
}
return
}
var minmaxFuncs = struct {
i8 func([]int8) (int8, int8)
ui8 func([]uint8) (uint8, uint8)
i16 func([]int16) (int16, int16)
ui16 func([]uint16) (uint16, uint16)
i32 func([]int32) (int32, int32)
ui32 func([]uint32) (uint32, uint32)
i64 func([]int64) (int64, int64)
ui64 func([]uint64) (uint64, uint64)
}{}
// GetMinMaxInt8 returns the min and max for a int8 slice, using AVX2 or
// SSE4 cpu extensions if available, falling back to a pure go implementation
// if they are unavailable or built with the noasm tag.
func GetMinMaxInt8(v []int8) (min, max int8) {
return minmaxFuncs.i8(v)
}
// GetMinMaxUint8 returns the min and max for a uint8 slice, using AVX2 or
// SSE4 cpu extensions if available, falling back to a pure go implementation
// if they are unavailable or built with the noasm tag.
func GetMinMaxUint8(v []uint8) (min, max uint8) {
return minmaxFuncs.ui8(v)
}
// GetMinMaxInt16 returns the min and max for a int16 slice, using AVX2 or
// SSE4 cpu extensions if available, falling back to a pure go implementation
// if they are unavailable or built with the noasm tag.
func GetMinMaxInt16(v []int16) (min, max int16) {
return minmaxFuncs.i16(v)
}
// GetMinMaxUint16 returns the min and max for a uint16 slice, using AVX2 or
// SSE4 cpu extensions if available, falling back to a pure go implementation
// if they are unavailable or built with the noasm tag.
func GetMinMaxUint16(v []uint16) (min, max uint16) {
return minmaxFuncs.ui16(v)
}
// GetMinMaxInt32 returns the min and max for a int32 slice, using AVX2 or
// SSE4 cpu extensions if available, falling back to a pure go implementation
// if they are unavailable or built with the noasm tag.
func GetMinMaxInt32(v []int32) (min, max int32) {
return minmaxFuncs.i32(v)
}
// GetMinMaxUint32 returns the min and max for a uint32 slice, using AVX2 or
// SSE4 cpu extensions if available, falling back to a pure go implementation
// if they are unavailable or built with the noasm tag.
func GetMinMaxUint32(v []uint32) (min, max uint32) {
return minmaxFuncs.ui32(v)
}
// GetMinMaxInt64 returns the min and max for a int64 slice, using AVX2 or
// SSE4 cpu extensions if available, falling back to a pure go implementation
// if they are unavailable or built with the noasm tag.
func GetMinMaxInt64(v []int64) (min, max int64) {
return minmaxFuncs.i64(v)
}
// GetMinMaxUint64 returns the min and max for a uint64 slice, using AVX2 or
// SSE4 cpu extensions if available, falling back to a pure go implementation
// if they are unavailable or built with the noasm tag.
func GetMinMaxUint64(v []uint64) (min, max uint64) {
return minmaxFuncs.ui64(v)
}
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