371 lines
7.2 KiB
ArmAsm
371 lines
7.2 KiB
ArmAsm
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//
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// hamming distance calculations in Go
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//
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// https://github.com/steakknife/hamming
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//
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// Copyright © 2014, 2015, 2016 Barry Allard
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//
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// MIT license
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//
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#include "textflag.h"
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// type SliceHeader struct {
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// Data uintptr 0
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// Len int 8
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// Cap int 16
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// }
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// 0 x.Data
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// 8 x.Len
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// 16 x.Cap
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// 24 ret
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// type StringHeader struct {
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// Data uintptr 0
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// Len int 8
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// }
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// 0 x.Data
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// 8 x.Len
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// 16 ret
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// func CountBitsInt8sPopCnt(x []int8) (ret int)
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TEXT ·CountBitsInt8sPopCnt(SB),NOSPLIT,$0
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JMP ·CountBitsUint8sPopCnt(SB)
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// func CountBitsInt16sPopCnt(x []int16) (ret int)
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TEXT ·CountBitsInt16sPopCnt(SB),NOSPLIT,$0
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JMP ·CountBitsUint16sPopCnt(SB)
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// func CountBitsInt32sPopCnt(x []int32) (ret int)
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TEXT ·CountBitsInt32sPopCnt(SB),NOSPLIT,$0
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JMP ·CountBitsUint32sPopCnt(SB)
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// func CountBitsInt64sPopCnt(x []int64) (ret int)
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TEXT ·CountBitsInt64sPopCnt(SB),NOSPLIT,$0
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JMP ·CountBitsUint64sPopCnt(SB)
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// func CountBitsUint8sPopCnt(x []uint8) (ret int)
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TEXT ·CountBitsUint8sPopCnt(SB),NOSPLIT,$0
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XORQ AX, AX // ret = 0
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MOVQ x+8(FP), CX // x.Len -> CX
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test_negative_slice_len:
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MOVQ CX, BX // x.Len < 0 ---> x.Len[63] != 0
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SHRQ $63, BX
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JNZ done
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MOVQ x+0(FP), DI // x.Data -> DI
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CMPQ CX, $32 // x.Len >= 32
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JL unrolled_loop_skip
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unrolled_loop_setup:
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XORQ R9, R9
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XORQ BX, BX
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XORQ DX, DX
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unrolled_loop: // 4 unrolled loops of POPCNTQ (4 quad words at a time)
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SUBQ $32, CX
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POPCNTQ 0(DI), R10
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ADDQ R10, R9
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POPCNTQ 8(DI), R11
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ADDQ R11, AX
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POPCNTQ 16(DI), R12
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ADDQ R12, BX
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POPCNTQ 24(DI), R13
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ADDQ R13, DX
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ADDQ $32, DI
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CMPQ CX, $32 // x.Len >= 32
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JGE unrolled_loop
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unrolled_loop_done:
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ADDQ R9, AX
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ADDQ BX, DX
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ADDQ DX, AX
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XORQ BX, BX
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unrolled_loop_skip:
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CMPQ CX, $0
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JZ done
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XORQ DX, DX
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remainder_loop:
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MOVB 0(DI), DL
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POPCNTQ DX, BX
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ADDQ BX, AX
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INCQ DI
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DECQ CX
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JNZ remainder_loop
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done:
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MOVQ AX, ret+24(FP)
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RET
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// func CountBitsUint16sPopCnt(x []uint16) (ret int)
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TEXT ·CountBitsUint16sPopCnt(SB),NOSPLIT,$0
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XORQ AX, AX // ret = 0
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MOVQ x+8(FP), CX // x.Len -> CX
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test_negative_slice_len:
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MOVQ CX, BX // x.Len*2 < 0 ---> x.Len[63:62] != 0
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SHLQ $1, CX
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SHRQ $62, BX
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JNZ done
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MOVQ x+0(FP), DI // x.Data -> DI
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CMPQ CX, $32 // x.Len*2 >= 32
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JL unrolled_loop_skip
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unrolled_loop_setup:
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XORQ R9, R9
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XORQ BX, BX
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XORQ DX, DX
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unrolled_loop: // 4 unrolled loops of POPCNTQ (4 quad words at a time)
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SUBQ $32, CX
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POPCNTQ 0(DI), R10
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ADDQ R10, R9
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POPCNTQ 8(DI), R11
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ADDQ R11, AX
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POPCNTQ 16(DI), R12
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ADDQ R12, BX
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POPCNTQ 24(DI), R13
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ADDQ R13, DX
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ADDQ $32, DI
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CMPQ CX, $32 // x.Len*2 >= 32
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JGE unrolled_loop
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unrolled_loop_done:
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ADDQ R9, AX
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ADDQ BX, DX
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ADDQ DX, AX
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XORQ BX, BX
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unrolled_loop_skip:
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CMPQ CX, $0
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JZ done
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XORQ DX, DX
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remainder_loop:
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MOVW 0(DI), DX
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POPCNTQ DX, BX
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ADDQ BX, AX
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ADDQ $2, DI
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SUBQ $2, CX
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JNZ remainder_loop
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done:
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MOVQ AX, ret+24(FP)
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RET
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// func CountBitsUint32sPopCnt(x []uint32) (ret int)
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TEXT ·CountBitsUint32sPopCnt(SB),NOSPLIT,$0
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XORQ AX, AX // ret = 0
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MOVQ x+8(FP), CX // x.Len -> CX
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MOVQ CX, BX
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MOVQ x+0(FP), DI // x.Data -> DI
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test_negative_slice_len:
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SHLQ $2, CX // x.Len*4 < 0 ---> x.Len[63:61] != 0
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SHRQ $61, BX
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JNZ done
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CMPQ CX, $32 // x.Len*4 >= 32
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JL unrolled_loop_skip
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unrolled_loop_setup:
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XORQ R9, R9
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XORQ BX, BX
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XORQ DX, DX
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unrolled_loop: // 4 unrolled loops of POPCNTQ (4 quad words at a time)
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SUBQ $32, CX
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POPCNTQ 0(DI), R10 // r9 += popcntq(QW DI+0)
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ADDQ R10, R9
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POPCNTQ 8(DI), R11 // ax += popcntq(QW DI+8)
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ADDQ R11, AX
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POPCNTQ 16(DI), R12 // bx += popcntq(QW DI+16)
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ADDQ R12, BX
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POPCNTQ 24(DI), R13 // dx += popcntq(QW DI+24)
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ADDQ R13, DX
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ADDQ $32, DI
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CMPQ CX, $32 // x.Len*4 >= 32
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JGE unrolled_loop
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unrolled_loop_done:
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ADDQ R9, AX // ax = (ax + r9) + (bx + dx)
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ADDQ BX, DX
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ADDQ DX, AX
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XORQ BX, BX
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unrolled_loop_skip:
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CMPQ CX, $0
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JZ done
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XORQ DX, DX
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remainder_loop:
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MOVB (DI), DX // ax += popcnt(DB 0(DI))
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POPCNTQ DX, BX
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ADDQ BX, AX
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INCQ DI
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DECQ CX
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JNZ remainder_loop
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done:
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MOVQ AX, ret+24(FP)
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RET
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// func CountBitsUint64sPopCnt(x []uint64) (ret int)
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TEXT ·CountBitsUint64sPopCnt(SB),NOSPLIT,$0
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XORQ AX, AX // ret = 0
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MOVQ x+8(FP), CX // x.Len -> CX
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test_negative_slice_len:
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MOVQ CX, BX // x.Len*8 < 0 ---> x.Len[63:60] != 0
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SHLQ $3, CX
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SHRQ $60, BX
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JNZ done
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MOVQ x+0(FP), DI // x.Data -> DI
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CMPQ CX, $32 // x.Len*8 >= 32
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JL unrolled_loop_skip
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unrolled_loop_setup:
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XORQ R9, R9
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XORQ BX, BX
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XORQ DX, DX
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unrolled_loop: // 4 unrolled loops of POPCNTQ (4 quad words at a time)
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SUBQ $32, CX
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POPCNTQ 0(DI), R10
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ADDQ R10, R9
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POPCNTQ 8(DI), R11
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ADDQ R11, AX
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POPCNTQ 16(DI), R12
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ADDQ R12, BX
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POPCNTQ 24(DI), R13
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ADDQ R13, DX
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ADDQ $32, DI
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CMPQ CX, $32 // x.Len*4 >= 32
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JGE unrolled_loop
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unrolled_loop_done:
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ADDQ R9, AX
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ADDQ BX, DX
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ADDQ DX, AX
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XORQ BX, BX
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unrolled_loop_skip:
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CMPQ CX, $0
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JZ done
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XORQ DX, DX
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remainder_loop:
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MOVQ 0(DI), DX
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POPCNTQ DX, BX
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ADDQ BX, AX
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ADDQ $8, DI
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SUBQ $8, CX
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JNZ remainder_loop
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done:
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MOVQ AX, ret+24(FP)
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RET
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// func CountBitsBytesPopCnt(x []byte) (ret int)
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TEXT ·CountBitsBytesPopCnt(SB),NOSPLIT,$0
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JMP ·CountBitsUint8sPopCnt(SB)
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// func CountBitsRunesPopCnt(x []rune) (ret int)
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TEXT ·CountBitsRunesPopCnt(SB),NOSPLIT,$0
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JMP ·CountBitsUint32sPopCnt(SB)
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// func CountBitsStringPopCnt(s string) (ret int)
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TEXT ·CountBitsStringPopCnt(SB),NOSPLIT,$0
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XORQ AX, AX // ret = 0
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MOVQ x+8(FP), CX // x.Len -> CX
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test_negative_slice_len:
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MOVQ CX, BX // x.Len < 0 ---> x.Len[63] != 0
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SHRQ $63, BX
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JNZ done
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MOVQ x+0(FP), DI // x.Data -> DI
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CMPQ CX, $32 // x.Len >= 32
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JL unrolled_loop_skip
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unrolled_loop_setup:
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XORQ R9, R9
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XORQ BX, BX
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XORQ DX, DX
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unrolled_loop: // 4 unrolled loops of POPCNTQ (4 quad words at a time)
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SUBQ $32, CX
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POPCNTQ 0(DI), R10
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ADDQ R10, R9
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POPCNTQ 8(DI), R11
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ADDQ R11, AX
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POPCNTQ 16(DI), R12
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ADDQ R12, BX
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POPCNTQ 24(DI), R13
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ADDQ R13, DX
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ADDQ $32, DI
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CMPQ CX, $32 // x.Len >= 32
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JGE unrolled_loop
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unrolled_loop_done:
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ADDQ R9, AX
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ADDQ BX, DX
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ADDQ DX, AX
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XORQ BX, BX
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unrolled_loop_skip:
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CMPQ CX, $0
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JZ done
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XORQ DX, DX
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remainder_loop:
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MOVB 0(DI), DL
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POPCNTQ DX, BX
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ADDQ BX, AX
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INCQ DI
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DECQ CX
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JNZ remainder_loop
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done:
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MOVQ AX, ret+16(FP)
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RET
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