nat_asm.go

     1  // Copyright 2023 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build !purego && (386 || amd64 || arm || arm64 || loong64 || ppc64 || ppc64le || riscv64 || s390x)
     6  
     7  package bigmod
     8  
     9  import (
    10  	"crypto/internal/fips140deps/cpu"
    11  	"crypto/internal/impl"
    12  )
    13  
    14  // amd64 assembly uses ADCX/ADOX/MULX if ADX is available to run two carry
    15  // chains in the flags in parallel across the whole operation, and aggressively
    16  // unrolls loops. arm64 processes four words at a time.
    17  //
    18  // It's unclear why the assembly for all other architectures, as well as for
    19  // amd64 without ADX, perform better than the compiler output.
    20  // TODO(filippo): file cmd/compile performance issue.
    21  
    22  var supportADX = cpu.X86HasADX && cpu.X86HasBMI2
    23  
    24  func init() {
    25  	if cpu.AMD64 {
    26  		impl.Register("aes", "ADX", &supportADX)
    27  	}
    28  }
    29  
    30  //go:noescape
    31  func addMulVVW1024(z, x *uint, y uint) (c uint)
    32  
    33  //go:noescape
    34  func addMulVVW1536(z, x *uint, y uint) (c uint)
    35  
    36  //go:noescape
    37  func addMulVVW2048(z, x *uint, y uint) (c uint)
    38
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