mirror of
https://codeberg.org/superseriousbusiness/gotosocial.git
synced 2024-12-24 18:08:18 +03:00
51 lines
1.2 KiB
Go
51 lines
1.2 KiB
Go
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// Copyright 2023 Dolthub, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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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//go:build amd64 && !nosimd
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package swiss
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import (
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"math/bits"
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_ "unsafe"
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"github.com/dolthub/swiss/simd"
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)
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const (
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groupSize = 16
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maxAvgGroupLoad = 14
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)
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type bitset uint16
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func metaMatchH2(m *metadata, h h2) bitset {
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b := simd.MatchMetadata((*[16]int8)(m), int8(h))
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return bitset(b)
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}
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func metaMatchEmpty(m *metadata) bitset {
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b := simd.MatchMetadata((*[16]int8)(m), empty)
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return bitset(b)
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}
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func nextMatch(b *bitset) (s uint32) {
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s = uint32(bits.TrailingZeros16(uint16(*b)))
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*b &= ^(1 << s) // clear bit |s|
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return
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}
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//go:linkname fastrand runtime.fastrand
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func fastrand() uint32
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