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213 lines
3.5 KiB
213 lines
3.5 KiB
//+build !noasm
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//+build !appengine
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// Copyright 2015, Klaus Post, see LICENSE for details.
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// func crc32sse(a []byte) uint32
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TEXT ·crc32sse(SB), 4, $0
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MOVQ a+0(FP), R10
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XORQ BX, BX
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// CRC32 dword (R10), EBX
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BYTE $0xF2; BYTE $0x41; BYTE $0x0f
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BYTE $0x38; BYTE $0xf1; BYTE $0x1a
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MOVL BX, ret+24(FP)
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RET
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// func crc32sseAll(a []byte, dst []uint32)
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TEXT ·crc32sseAll(SB), 4, $0
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MOVQ a+0(FP), R8 // R8: src
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MOVQ a_len+8(FP), R10 // input length
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MOVQ dst+24(FP), R9 // R9: dst
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SUBQ $4, R10
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JS end
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JZ one_crc
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MOVQ R10, R13
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SHRQ $2, R10 // len/4
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ANDQ $3, R13 // len&3
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XORQ BX, BX
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ADDQ $1, R13
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TESTQ R10, R10
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JZ rem_loop
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crc_loop:
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MOVQ (R8), R11
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XORQ BX, BX
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XORQ DX, DX
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XORQ DI, DI
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MOVQ R11, R12
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SHRQ $8, R11
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MOVQ R12, AX
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MOVQ R11, CX
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SHRQ $16, R12
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SHRQ $16, R11
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MOVQ R12, SI
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// CRC32 EAX, EBX
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BYTE $0xF2; BYTE $0x0f
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BYTE $0x38; BYTE $0xf1; BYTE $0xd8
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// CRC32 ECX, EDX
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BYTE $0xF2; BYTE $0x0f
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BYTE $0x38; BYTE $0xf1; BYTE $0xd1
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// CRC32 ESI, EDI
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BYTE $0xF2; BYTE $0x0f
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BYTE $0x38; BYTE $0xf1; BYTE $0xfe
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MOVL BX, (R9)
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MOVL DX, 4(R9)
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MOVL DI, 8(R9)
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XORQ BX, BX
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MOVL R11, AX
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// CRC32 EAX, EBX
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BYTE $0xF2; BYTE $0x0f
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BYTE $0x38; BYTE $0xf1; BYTE $0xd8
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MOVL BX, 12(R9)
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ADDQ $16, R9
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ADDQ $4, R8
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XORQ BX, BX
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SUBQ $1, R10
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JNZ crc_loop
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rem_loop:
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MOVL (R8), AX
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// CRC32 EAX, EBX
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BYTE $0xF2; BYTE $0x0f
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BYTE $0x38; BYTE $0xf1; BYTE $0xd8
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MOVL BX, (R9)
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ADDQ $4, R9
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ADDQ $1, R8
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XORQ BX, BX
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SUBQ $1, R13
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JNZ rem_loop
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end:
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RET
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one_crc:
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MOVQ $1, R13
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XORQ BX, BX
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JMP rem_loop
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// func matchLenSSE4(a, b []byte, max int) int
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TEXT ·matchLenSSE4(SB), 4, $0
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MOVQ a_base+0(FP), SI
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MOVQ b_base+24(FP), DI
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MOVQ DI, DX
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MOVQ max+48(FP), CX
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cmp8:
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// As long as we are 8 or more bytes before the end of max, we can load and
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// compare 8 bytes at a time. If those 8 bytes are equal, repeat.
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CMPQ CX, $8
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JLT cmp1
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MOVQ (SI), AX
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MOVQ (DI), BX
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CMPQ AX, BX
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JNE bsf
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ADDQ $8, SI
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ADDQ $8, DI
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SUBQ $8, CX
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JMP cmp8
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bsf:
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// If those 8 bytes were not equal, XOR the two 8 byte values, and return
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// the index of the first byte that differs. The BSF instruction finds the
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// least significant 1 bit, the amd64 architecture is little-endian, and
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// the shift by 3 converts a bit index to a byte index.
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XORQ AX, BX
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BSFQ BX, BX
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SHRQ $3, BX
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ADDQ BX, DI
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// Subtract off &b[0] to convert from &b[ret] to ret, and return.
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SUBQ DX, DI
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MOVQ DI, ret+56(FP)
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RET
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cmp1:
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// In the slices' tail, compare 1 byte at a time.
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CMPQ CX, $0
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JEQ matchLenEnd
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MOVB (SI), AX
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MOVB (DI), BX
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CMPB AX, BX
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JNE matchLenEnd
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ADDQ $1, SI
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ADDQ $1, DI
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SUBQ $1, CX
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JMP cmp1
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matchLenEnd:
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// Subtract off &b[0] to convert from &b[ret] to ret, and return.
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SUBQ DX, DI
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MOVQ DI, ret+56(FP)
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RET
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// func histogram(b []byte, h []int32)
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TEXT ·histogram(SB), 4, $0
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MOVQ b+0(FP), SI // SI: &b
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MOVQ b_len+8(FP), R9 // R9: len(b)
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MOVQ h+24(FP), DI // DI: Histogram
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MOVQ R9, R8
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SHRQ $3, R8
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JZ hist1
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XORQ R11, R11
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loop_hist8:
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MOVQ (SI), R10
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MOVB R10, R11
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INCL (DI)(R11*4)
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SHRQ $8, R10
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MOVB R10, R11
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INCL (DI)(R11*4)
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SHRQ $8, R10
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MOVB R10, R11
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INCL (DI)(R11*4)
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SHRQ $8, R10
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MOVB R10, R11
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INCL (DI)(R11*4)
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SHRQ $8, R10
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MOVB R10, R11
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INCL (DI)(R11*4)
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SHRQ $8, R10
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MOVB R10, R11
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INCL (DI)(R11*4)
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SHRQ $8, R10
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MOVB R10, R11
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INCL (DI)(R11*4)
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SHRQ $8, R10
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INCL (DI)(R10*4)
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ADDQ $8, SI
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DECQ R8
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JNZ loop_hist8
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hist1:
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ANDQ $7, R9
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JZ end_hist
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XORQ R10, R10
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loop_hist1:
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MOVB (SI), R10
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INCL (DI)(R10*4)
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INCQ SI
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DECQ R9
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JNZ loop_hist1
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end_hist:
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RET
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