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//go:build !appengine && !noasm && gc
// +build !appengine,!noasm,gc
package s2
const hasAmd64Asm = true
// 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)
}
|
