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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.
//go:build !noasm
package utils
import "golang.org/x/sys/cpu"
func init() {
// if the CPU supports AVX2 or SSE4 then let's use those to benefit from SIMD
// to accelerate the performance for finding the min and max for an integral slice.
// otherwise fallback to a pure go implementation if the cpu doesn't have these features.
if cpu.X86.HasAVX2 {
minmaxFuncs.i8 = int8MaxMinAVX2
minmaxFuncs.ui8 = uint8MaxMinAVX2
minmaxFuncs.i16 = int16MaxMinAVX2
minmaxFuncs.ui16 = uint16MaxMinAVX2
minmaxFuncs.i32 = int32MaxMinAVX2
minmaxFuncs.ui32 = uint32MaxMinAVX2
minmaxFuncs.i64 = int64MaxMinAVX2
minmaxFuncs.ui64 = uint64MaxMinAVX2
} else if cpu.X86.HasSSE42 {
minmaxFuncs.i8 = int8MaxMinSSE4
minmaxFuncs.ui8 = uint8MaxMinSSE4
minmaxFuncs.i16 = int16MaxMinSSE4
minmaxFuncs.ui16 = uint16MaxMinSSE4
minmaxFuncs.i32 = int32MaxMinSSE4
minmaxFuncs.ui32 = uint32MaxMinSSE4
minmaxFuncs.i64 = int64MaxMinSSE4
minmaxFuncs.ui64 = uint64MaxMinSSE4
} else {
minmaxFuncs.i8 = int8MinMax
minmaxFuncs.ui8 = uint8MinMax
minmaxFuncs.i16 = int16MinMax
minmaxFuncs.ui16 = uint16MinMax
minmaxFuncs.i32 = int32MinMax
minmaxFuncs.ui32 = uint32MinMax
minmaxFuncs.i64 = int64MinMax
minmaxFuncs.ui64 = uint64MinMax
}
}
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