149 lines
3.8 KiB
Go
149 lines
3.8 KiB
Go
//go:build !appengine && !noasm && gc
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// +build !appengine,!noasm,gc
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package s2
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const hasAmd64Asm = true
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// encodeBlock encodes a non-empty src to a guaranteed-large-enough dst. It
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// assumes that the varint-encoded length of the decompressed bytes has already
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// been written.
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//
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// It also assumes that:
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//
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// len(dst) >= MaxEncodedLen(len(src)) &&
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// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
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func encodeBlock(dst, src []byte) (d int) {
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const (
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// Use 12 bit table when less than...
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limit12B = 16 << 10
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// Use 10 bit table when less than...
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limit10B = 4 << 10
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// Use 8 bit table when less than...
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limit8B = 512
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)
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if len(src) >= 4<<20 {
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return encodeBlockAsm(dst, src)
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}
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if len(src) >= limit12B {
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return encodeBlockAsm4MB(dst, src)
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}
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if len(src) >= limit10B {
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return encodeBlockAsm12B(dst, src)
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}
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if len(src) >= limit8B {
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return encodeBlockAsm10B(dst, src)
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}
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if len(src) < minNonLiteralBlockSize {
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return 0
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}
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return encodeBlockAsm8B(dst, src)
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}
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// encodeBlockBetter encodes a non-empty src to a guaranteed-large-enough dst. It
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// assumes that the varint-encoded length of the decompressed bytes has already
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// been written.
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//
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// It also assumes that:
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//
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// len(dst) >= MaxEncodedLen(len(src)) &&
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// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
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func encodeBlockBetter(dst, src []byte) (d int) {
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const (
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// Use 12 bit table when less than...
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limit12B = 16 << 10
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// Use 10 bit table when less than...
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limit10B = 4 << 10
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// Use 8 bit table when less than...
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limit8B = 512
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)
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if len(src) > 4<<20 {
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return encodeBetterBlockAsm(dst, src)
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}
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if len(src) >= limit12B {
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return encodeBetterBlockAsm4MB(dst, src)
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}
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if len(src) >= limit10B {
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return encodeBetterBlockAsm12B(dst, src)
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}
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if len(src) >= limit8B {
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return encodeBetterBlockAsm10B(dst, src)
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}
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if len(src) < minNonLiteralBlockSize {
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return 0
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}
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return encodeBetterBlockAsm8B(dst, src)
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}
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// encodeBlockSnappy encodes a non-empty src to a guaranteed-large-enough dst. It
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// assumes that the varint-encoded length of the decompressed bytes has already
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// been written.
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//
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// It also assumes that:
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//
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// len(dst) >= MaxEncodedLen(len(src)) &&
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// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
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func encodeBlockSnappy(dst, src []byte) (d int) {
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const (
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// Use 12 bit table when less than...
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limit12B = 16 << 10
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// Use 10 bit table when less than...
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limit10B = 4 << 10
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// Use 8 bit table when less than...
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limit8B = 512
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)
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if len(src) >= 64<<10 {
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return encodeSnappyBlockAsm(dst, src)
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}
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if len(src) >= limit12B {
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return encodeSnappyBlockAsm64K(dst, src)
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}
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if len(src) >= limit10B {
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return encodeSnappyBlockAsm12B(dst, src)
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}
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if len(src) >= limit8B {
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return encodeSnappyBlockAsm10B(dst, src)
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}
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if len(src) < minNonLiteralBlockSize {
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return 0
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}
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return encodeSnappyBlockAsm8B(dst, src)
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}
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// encodeBlockSnappy encodes a non-empty src to a guaranteed-large-enough dst. It
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// assumes that the varint-encoded length of the decompressed bytes has already
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// been written.
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//
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// It also assumes that:
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//
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// len(dst) >= MaxEncodedLen(len(src)) &&
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// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize
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func encodeBlockBetterSnappy(dst, src []byte) (d int) {
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const (
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// Use 12 bit table when less than...
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limit12B = 16 << 10
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// Use 10 bit table when less than...
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limit10B = 4 << 10
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// Use 8 bit table when less than...
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limit8B = 512
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)
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if len(src) >= 64<<10 {
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return encodeSnappyBetterBlockAsm(dst, src)
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}
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if len(src) >= limit12B {
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return encodeSnappyBetterBlockAsm64K(dst, src)
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}
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if len(src) >= limit10B {
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return encodeSnappyBetterBlockAsm12B(dst, src)
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}
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if len(src) >= limit8B {
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return encodeSnappyBetterBlockAsm10B(dst, src)
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}
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if len(src) < minNonLiteralBlockSize {
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return 0
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}
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return encodeSnappyBetterBlockAsm8B(dst, src)
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}
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