github.com/saintwish/kv@v1.0.4/swiss/simd/asm.go (about)

     1  // From https://github.com/dolthub/swiss
     2  // Copyright 2023 Dolthub, Inc.
     3  //
     4  // Licensed under the Apache License, Version 2.0 (the "License");
     5  // you may not use this file except in compliance with the License.
     6  // You may obtain a copy of the License at
     7  //
     8  //     http://www.apache.org/licenses/LICENSE-2.0
     9  //
    10  // Unless required by applicable law or agreed to in writing, software
    11  // distributed under the License is distributed on an "AS IS" BASIS,
    12  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  // See the License for the specific language governing permissions and
    14  // limitations under the License.
    15  
    16  //go:build ignore
    17  // +build ignore
    18  
    19  package main
    20  
    21  import (
    22  	. "github.com/mmcloughlin/avo/build"
    23  	. "github.com/mmcloughlin/avo/operand"
    24  )
    25  
    26  func main() {
    27  	ConstraintExpr("amd64")
    28  
    29  	TEXT("MatchMetadata", NOSPLIT, "func(metadata *[16]int8, hash int8) uint16")
    30  	Doc("MatchMetadata performs a 16-way probe of |metadata| using SSE instructions",
    31  		"nb: |metadata| must be an aligned pointer")
    32  	m := Mem{Base: Load(Param("metadata"), GP64())}
    33  	h := Load(Param("hash"), GP32())
    34  	mask := GP32()
    35  
    36  	x0, x1, x2 := XMM(), XMM(), XMM()
    37  	MOVD(h, x0)
    38  	PXOR(x1, x1)
    39  	PSHUFB(x1, x0)
    40  	MOVOU(m, x2)
    41  	PCMPEQB(x2, x0)
    42  	PMOVMSKB(x0, mask)
    43  
    44  	Store(mask.As16(), ReturnIndex(0))
    45  	RET()
    46  	Generate()
    47  }