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// Code generated by command: go run mask_asm.go -pkg mem -out ../mem/mask_amd64.s -stubs ../mem/mask_amd64.go. DO NOT EDIT.
//go:build !purego
#include "textflag.h"
// func Mask(dst []byte, src []byte) int
// Requires: AVX, AVX2, CMOV, SSE2
TEXT ·Mask(SB), NOSPLIT, $0-56
MOVQ dst_base+0(FP), AX
MOVQ src_base+24(FP), CX
MOVQ dst_len+8(FP), DX
MOVQ src_len+32(FP), BX
CMPQ BX, DX
CMOVQLT BX, DX
MOVQ DX, ret+48(FP)
tail:
CMPQ DX, $0x00
JE done
CMPQ DX, $0x01
JE handle1
CMPQ DX, $0x03
JBE handle2to3
CMPQ DX, $0x04
JE handle4
CMPQ DX, $0x08
JB handle5to7
JE handle8
CMPQ DX, $0x10
JBE handle9to16
CMPQ DX, $0x20
JBE handle17to32
CMPQ DX, $0x40
JBE handle33to64
BTL $0x08, github·com∕segmentio∕asm∕cpu·X86+0(SB)
JCC generic
CMPQ DX, $0x00000080
JB avx2_tail
JMP avx2
generic:
MOVOU (CX), X0
MOVOU (AX), X1
MOVOU 16(CX), X2
MOVOU 16(AX), X3
MOVOU 32(CX), X4
MOVOU 32(AX), X5
MOVOU 48(CX), X6
MOVOU 48(AX), X7
PAND X1, X0
PAND X3, X2
PAND X5, X4
PAND X7, X6
MOVOU X0, (AX)
MOVOU X2, 16(AX)
MOVOU X4, 32(AX)
MOVOU X6, 48(AX)
ADDQ $0x40, CX
ADDQ $0x40, AX
SUBQ $0x40, DX
CMPQ DX, $0x40
JBE tail
JMP generic
done:
RET
handle1:
MOVB (CX), CL
MOVB (AX), DL
ANDB DL, CL
MOVB CL, (AX)
RET
handle2to3:
MOVW (CX), BX
MOVW (AX), SI
MOVW -2(CX)(DX*1), CX
MOVW -2(AX)(DX*1), DI
ANDW SI, BX
ANDW DI, CX
MOVW BX, (AX)
MOVW CX, -2(AX)(DX*1)
RET
handle4:
MOVL (CX), CX
MOVL (AX), DX
ANDL DX, CX
MOVL CX, (AX)
RET
handle5to7:
MOVL (CX), BX
MOVL (AX), SI
MOVL -4(CX)(DX*1), CX
MOVL -4(AX)(DX*1), DI
ANDL SI, BX
ANDL DI, CX
MOVL BX, (AX)
MOVL CX, -4(AX)(DX*1)
RET
handle8:
MOVQ (CX), CX
MOVQ (AX), DX
ANDQ DX, CX
MOVQ CX, (AX)
RET
handle9to16:
MOVQ (CX), BX
MOVQ (AX), SI
MOVQ -8(CX)(DX*1), CX
MOVQ -8(AX)(DX*1), DI
ANDQ SI, BX
ANDQ DI, CX
MOVQ BX, (AX)
MOVQ CX, -8(AX)(DX*1)
RET
handle17to32:
MOVOU (CX), X0
MOVOU (AX), X1
MOVOU -16(CX)(DX*1), X2
MOVOU -16(AX)(DX*1), X3
PAND X1, X0
PAND X3, X2
MOVOU X0, (AX)
MOVOU X2, -16(AX)(DX*1)
RET
handle33to64:
MOVOU (CX), X0
MOVOU (AX), X1
MOVOU 16(CX), X2
MOVOU 16(AX), X3
MOVOU -32(CX)(DX*1), X4
MOVOU -32(AX)(DX*1), X5
MOVOU -16(CX)(DX*1), X6
MOVOU -16(AX)(DX*1), X7
PAND X1, X0
PAND X3, X2
PAND X5, X4
PAND X7, X6
MOVOU X0, (AX)
MOVOU X2, 16(AX)
MOVOU X4, -32(AX)(DX*1)
MOVOU X6, -16(AX)(DX*1)
RET
// AVX optimized version for medium to large size inputs.
avx2:
VMOVDQU (CX), Y0
VMOVDQU 32(CX), Y1
VMOVDQU 64(CX), Y2
VMOVDQU 96(CX), Y3
VPAND (AX), Y0, Y0
VPAND 32(AX), Y1, Y1
VPAND 64(AX), Y2, Y2
VPAND 96(AX), Y3, Y3
VMOVDQU Y0, (AX)
VMOVDQU Y1, 32(AX)
VMOVDQU Y2, 64(AX)
VMOVDQU Y3, 96(AX)
ADDQ $0x00000080, CX
ADDQ $0x00000080, AX
SUBQ $0x00000080, DX
JZ avx2_done
CMPQ DX, $0x00000080
JAE avx2
avx2_tail:
CMPQ DX, $0x40
JBE avx2_tail_1to64
VMOVDQU (CX), Y0
VMOVDQU 32(CX), Y1
VMOVDQU -64(CX)(DX*1), Y2
VMOVDQU -32(CX)(DX*1), Y3
VPAND (AX), Y0, Y0
VPAND 32(AX), Y1, Y1
VPAND -64(AX)(DX*1), Y2, Y2
VPAND -32(AX)(DX*1), Y3, Y3
VMOVDQU Y0, (AX)
VMOVDQU Y1, 32(AX)
VMOVDQU Y2, -64(AX)(DX*1)
VMOVDQU Y3, -32(AX)(DX*1)
JMP avx2_done
avx2_tail_1to64:
VMOVDQU -64(CX)(DX*1), Y0
VMOVDQU -32(CX)(DX*1), Y1
VPAND -64(AX)(DX*1), Y0, Y0
VPAND -32(AX)(DX*1), Y1, Y1
VMOVDQU Y0, -64(AX)(DX*1)
VMOVDQU Y1, -32(AX)(DX*1)
avx2_done:
VZEROUPPER
RET
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