mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-25 03:40:10 +01:00
196 lines
5.0 KiB
ArmAsm
196 lines
5.0 KiB
ArmAsm
// +build !appengine
|
|
// +build gc
|
|
// +build !noasm
|
|
|
|
#include "textflag.h"
|
|
#include "funcdata.h"
|
|
#include "go_asm.h"
|
|
|
|
#ifdef GOAMD64_v4
|
|
#ifndef GOAMD64_v3
|
|
#define GOAMD64_v3
|
|
#endif
|
|
#endif
|
|
|
|
#define bufoff 256 // see decompress.go, we're using [4][256]byte table
|
|
|
|
//func decompress4x_main_loop_x86(pbr0, pbr1, pbr2, pbr3 *bitReaderShifted,
|
|
// peekBits uint8, buf *byte, tbl *dEntrySingle) (int, bool)
|
|
TEXT ·decompress4x_main_loop_x86(SB), NOSPLIT, $8
|
|
#define off R8
|
|
#define buffer DI
|
|
#define table SI
|
|
|
|
#define br_bits_read R9
|
|
#define br_value R10
|
|
#define br_offset R11
|
|
#define peek_bits R12
|
|
#define exhausted DX
|
|
|
|
#define br0 R13
|
|
#define br1 R14
|
|
#define br2 R15
|
|
#define br3 BP
|
|
|
|
MOVQ BP, 0(SP)
|
|
|
|
XORQ exhausted, exhausted // exhausted = false
|
|
XORQ off, off // off = 0
|
|
|
|
MOVBQZX peekBits+32(FP), peek_bits
|
|
MOVQ buf+40(FP), buffer
|
|
MOVQ tbl+48(FP), table
|
|
|
|
MOVQ pbr0+0(FP), br0
|
|
MOVQ pbr1+8(FP), br1
|
|
MOVQ pbr2+16(FP), br2
|
|
MOVQ pbr3+24(FP), br3
|
|
|
|
main_loop:
|
|
{{ define "decode_2_values_x86" }}
|
|
// const stream = {{ var "id" }}
|
|
// br{{ var "id"}}.fillFast()
|
|
MOVBQZX bitReaderShifted_bitsRead(br{{ var "id" }}), br_bits_read
|
|
MOVQ bitReaderShifted_value(br{{ var "id" }}), br_value
|
|
MOVQ bitReaderShifted_off(br{{ var "id" }}), br_offset
|
|
|
|
// We must have at least 2 * max tablelog left
|
|
CMPQ br_bits_read, $64-22
|
|
JBE skip_fill{{ var "id" }}
|
|
|
|
SUBQ $32, br_bits_read // b.bitsRead -= 32
|
|
SUBQ $4, br_offset // b.off -= 4
|
|
|
|
// v := b.in[b.off-4 : b.off]
|
|
// v = v[:4]
|
|
// low := (uint32(v[0])) | (uint32(v[1]) << 8) | (uint32(v[2]) << 16) | (uint32(v[3]) << 24)
|
|
MOVQ bitReaderShifted_in(br{{ var "id" }}), AX
|
|
|
|
// b.value |= uint64(low) << (b.bitsRead & 63)
|
|
#ifdef GOAMD64_v3
|
|
SHLXQ br_bits_read, 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4]) << (b.bitsRead & 63)
|
|
#else
|
|
MOVL 0(br_offset)(AX*1), AX // AX = uint32(b.in[b.off:b.off+4])
|
|
MOVQ br_bits_read, CX
|
|
SHLQ CL, AX
|
|
#endif
|
|
|
|
ORQ AX, br_value
|
|
|
|
// exhausted = exhausted || (br{{ var "id"}}.off < 4)
|
|
CMPQ br_offset, $4
|
|
SETLT DL
|
|
ORB DL, DH
|
|
// }
|
|
skip_fill{{ var "id" }}:
|
|
|
|
// val0 := br{{ var "id"}}.peekTopBits(peekBits)
|
|
#ifdef GOAMD64_v3
|
|
SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
|
|
#else
|
|
MOVQ br_value, AX
|
|
MOVQ peek_bits, CX
|
|
SHRQ CL, AX // AX = (value >> peek_bits) & mask
|
|
#endif
|
|
|
|
// v0 := table[val0&mask]
|
|
MOVW 0(table)(AX*2), AX // AX - v0
|
|
|
|
// br{{ var "id"}}.advance(uint8(v0.entry))
|
|
MOVB AH, BL // BL = uint8(v0.entry >> 8)
|
|
|
|
#ifdef GOAMD64_v3
|
|
MOVBQZX AL, CX
|
|
SHLXQ AX, br_value, br_value // value <<= n
|
|
#else
|
|
MOVBQZX AL, CX
|
|
SHLQ CL, br_value // value <<= n
|
|
#endif
|
|
|
|
ADDQ CX, br_bits_read // bits_read += n
|
|
|
|
|
|
#ifdef GOAMD64_v3
|
|
SHRXQ peek_bits, br_value, AX // AX = (value >> peek_bits) & mask
|
|
#else
|
|
// val1 := br{{ var "id"}}.peekTopBits(peekBits)
|
|
MOVQ peek_bits, CX
|
|
MOVQ br_value, AX
|
|
SHRQ CL, AX // AX = (value >> peek_bits) & mask
|
|
#endif
|
|
|
|
// v1 := table[val1&mask]
|
|
MOVW 0(table)(AX*2), AX // AX - v1
|
|
|
|
// br{{ var "id"}}.advance(uint8(v1.entry))
|
|
MOVB AH, BH // BH = uint8(v1.entry >> 8)
|
|
|
|
#ifdef GOAMD64_v3
|
|
MOVBQZX AL, CX
|
|
SHLXQ AX, br_value, br_value // value <<= n
|
|
#else
|
|
MOVBQZX AL, CX
|
|
SHLQ CL, br_value // value <<= n
|
|
#endif
|
|
|
|
ADDQ CX, br_bits_read // bits_read += n
|
|
|
|
|
|
// these two writes get coalesced
|
|
// buf[stream][off] = uint8(v0.entry >> 8)
|
|
// buf[stream][off+1] = uint8(v1.entry >> 8)
|
|
MOVW BX, {{ var "bufofs" }}(buffer)(off*1)
|
|
|
|
// update the bitrader reader structure
|
|
MOVB br_bits_read, bitReaderShifted_bitsRead(br{{ var "id" }})
|
|
MOVQ br_value, bitReaderShifted_value(br{{ var "id" }})
|
|
MOVQ br_offset, bitReaderShifted_off(br{{ var "id" }})
|
|
{{ end }}
|
|
|
|
{{ set "id" "0" }}
|
|
{{ set "ofs" "0" }}
|
|
{{ set "bufofs" "0" }} {{/* id * bufoff */}}
|
|
{{ template "decode_2_values_x86" . }}
|
|
|
|
{{ set "id" "1" }}
|
|
{{ set "ofs" "8" }}
|
|
{{ set "bufofs" "256" }}
|
|
{{ template "decode_2_values_x86" . }}
|
|
|
|
{{ set "id" "2" }}
|
|
{{ set "ofs" "16" }}
|
|
{{ set "bufofs" "512" }}
|
|
{{ template "decode_2_values_x86" . }}
|
|
|
|
{{ set "id" "3" }}
|
|
{{ set "ofs" "24" }}
|
|
{{ set "bufofs" "768" }}
|
|
{{ template "decode_2_values_x86" . }}
|
|
|
|
ADDQ $2, off // off += 2
|
|
|
|
TESTB DH, DH // any br[i].ofs < 4?
|
|
JNZ end
|
|
|
|
CMPQ off, $bufoff
|
|
JL main_loop
|
|
end:
|
|
MOVQ 0(SP), BP
|
|
|
|
MOVB off, ret+56(FP)
|
|
RET
|
|
#undef off
|
|
#undef buffer
|
|
#undef table
|
|
|
|
#undef br_bits_read
|
|
#undef br_value
|
|
#undef br_offset
|
|
#undef peek_bits
|
|
#undef exhausted
|
|
|
|
#undef br0
|
|
#undef br1
|
|
#undef br2
|
|
#undef br3
|