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34 lines
1.1 KiB
Go
34 lines
1.1 KiB
Go
// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build !purego && (386 || amd64 || arm || arm64 || ppc64 || ppc64le || s390x)
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// +build !purego
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// +build 386 amd64 arm arm64 ppc64 ppc64le s390x
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package bigmod
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import "golang.org/x/sys/cpu"
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// amd64 assembly uses ADCX/ADOX/MULX if ADX is available to run two carry
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// chains in the flags in parallel across the whole operation, and aggressively
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// unrolls loops. arm64 processes four words at a time.
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//
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// It's unclear why the assembly for all other architectures, as well as for
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// amd64 without ADX, perform better than the compiler output.
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// TODO(filippo): file cmd/compile performance issue.
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var supportADX = cpu.X86.HasADX && cpu.X86.HasBMI2
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//go:noescape
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func addMulVVW256(z, x *uint, y uint) (c uint)
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//go:noescape
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func addMulVVW1024(z, x *uint, y uint) (c uint)
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//go:noescape
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func addMulVVW1536(z, x *uint, y uint) (c uint)
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//go:noescape
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func addMulVVW2048(z, x *uint, y uint) (c uint)
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