diff options
Diffstat (limited to 'vendor/github.com/klauspost/compress/s2/encode_amd64.go')
| -rw-r--r-- | vendor/github.com/klauspost/compress/s2/encode_amd64.go | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/vendor/github.com/klauspost/compress/s2/encode_amd64.go b/vendor/github.com/klauspost/compress/s2/encode_amd64.go new file mode 100644 index 00000000..e612225f --- /dev/null +++ b/vendor/github.com/klauspost/compress/s2/encode_amd64.go @@ -0,0 +1,142 @@ +//go:build !appengine && !noasm && gc +// +build !appengine,!noasm,gc + +package s2 + +// encodeBlock encodes a non-empty src to a guaranteed-large-enough dst. It +// assumes that the varint-encoded length of the decompressed bytes has already +// been written. +// +// It also assumes that: +// len(dst) >= MaxEncodedLen(len(src)) && +// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize +func encodeBlock(dst, src []byte) (d int) { + const ( + // Use 12 bit table when less than... + limit12B = 16 << 10 + // Use 10 bit table when less than... + limit10B = 4 << 10 + // Use 8 bit table when less than... + limit8B = 512 + ) + + if len(src) >= 4<<20 { + return encodeBlockAsm(dst, src) + } + if len(src) >= limit12B { + return encodeBlockAsm4MB(dst, src) + } + if len(src) >= limit10B { + return encodeBlockAsm12B(dst, src) + } + if len(src) >= limit8B { + return encodeBlockAsm10B(dst, src) + } + if len(src) < minNonLiteralBlockSize { + return 0 + } + return encodeBlockAsm8B(dst, src) +} + +// encodeBlockBetter encodes a non-empty src to a guaranteed-large-enough dst. It +// assumes that the varint-encoded length of the decompressed bytes has already +// been written. +// +// It also assumes that: +// len(dst) >= MaxEncodedLen(len(src)) && +// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize +func encodeBlockBetter(dst, src []byte) (d int) { + const ( + // Use 12 bit table when less than... + limit12B = 16 << 10 + // Use 10 bit table when less than... + limit10B = 4 << 10 + // Use 8 bit table when less than... + limit8B = 512 + ) + + if len(src) > 4<<20 { + return encodeBetterBlockAsm(dst, src) + } + if len(src) >= limit12B { + return encodeBetterBlockAsm4MB(dst, src) + } + if len(src) >= limit10B { + return encodeBetterBlockAsm12B(dst, src) + } + if len(src) >= limit8B { + return encodeBetterBlockAsm10B(dst, src) + } + if len(src) < minNonLiteralBlockSize { + return 0 + } + return encodeBetterBlockAsm8B(dst, src) +} + +// encodeBlockSnappy encodes a non-empty src to a guaranteed-large-enough dst. It +// assumes that the varint-encoded length of the decompressed bytes has already +// been written. +// +// It also assumes that: +// len(dst) >= MaxEncodedLen(len(src)) && +// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize +func encodeBlockSnappy(dst, src []byte) (d int) { + const ( + // Use 12 bit table when less than... + limit12B = 16 << 10 + // Use 10 bit table when less than... + limit10B = 4 << 10 + // Use 8 bit table when less than... + limit8B = 512 + ) + if len(src) >= 64<<10 { + return encodeSnappyBlockAsm(dst, src) + } + if len(src) >= limit12B { + return encodeSnappyBlockAsm64K(dst, src) + } + if len(src) >= limit10B { + return encodeSnappyBlockAsm12B(dst, src) + } + if len(src) >= limit8B { + return encodeSnappyBlockAsm10B(dst, src) + } + if len(src) < minNonLiteralBlockSize { + return 0 + } + return encodeSnappyBlockAsm8B(dst, src) +} + +// encodeBlockSnappy encodes a non-empty src to a guaranteed-large-enough dst. It +// assumes that the varint-encoded length of the decompressed bytes has already +// been written. +// +// It also assumes that: +// len(dst) >= MaxEncodedLen(len(src)) && +// minNonLiteralBlockSize <= len(src) && len(src) <= maxBlockSize +func encodeBlockBetterSnappy(dst, src []byte) (d int) { + const ( + // Use 12 bit table when less than... + limit12B = 16 << 10 + // Use 10 bit table when less than... + limit10B = 4 << 10 + // Use 8 bit table when less than... + limit8B = 512 + ) + if len(src) >= 64<<10 { + return encodeSnappyBetterBlockAsm(dst, src) + } + if len(src) >= limit12B { + return encodeSnappyBetterBlockAsm64K(dst, src) + } + if len(src) >= limit10B { + return encodeSnappyBetterBlockAsm12B(dst, src) + } + if len(src) >= limit8B { + return encodeSnappyBetterBlockAsm10B(dst, src) + } + if len(src) < minNonLiteralBlockSize { + return 0 + } + return encodeSnappyBetterBlockAsm8B(dst, src) +} |