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42 lines
1.0 KiB
42 lines
1.0 KiB
8 years ago
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//+build !noasm
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//+build !appengine
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// Copyright 2015, Klaus Post, see LICENSE for details.
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package flate
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import (
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"github.com/klauspost/cpuid"
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)
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// crc32sse returns a hash for the first 4 bytes of the slice
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// len(a) must be >= 4.
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//go:noescape
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func crc32sse(a []byte) uint32
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// crc32sseAll calculates hashes for each 4-byte set in a.
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// dst must be east len(a) - 4 in size.
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// The size is not checked by the assembly.
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//go:noescape
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func crc32sseAll(a []byte, dst []uint32)
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// matchLenSSE4 returns the number of matching bytes in a and b
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// up to length 'max'. Both slices must be at least 'max'
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// bytes in size.
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//
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// TODO: drop the "SSE4" name, since it doesn't use any SSE instructions.
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//
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//go:noescape
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func matchLenSSE4(a, b []byte, max int) int
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// histogram accumulates a histogram of b in h.
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// h must be at least 256 entries in length,
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// and must be cleared before calling this function.
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//go:noescape
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func histogram(b []byte, h []int32)
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// Detect SSE 4.2 feature.
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func init() {
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useSSE42 = cpuid.CPU.SSE42()
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}
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