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#include "textflag.h"
// void *memcpy(void *dst, const void *src, size_t n)
// DI = dst, SI = src, DX = size
TEXT clib·_memcpy(SB), $16-0
PUSHQ R8
PUSHQ CX
XORQ CX, CX // clear register
MEMCPY_QUAD_LOOP:
ADDQ $8, CX
CMPQ CX, DX
JA MEMCPY_QUAD_DONE
MOVQ -8(SI)(CX*1), R8
MOVQ R8, -8(DI)(CX*1)
JMP MEMCPY_QUAD_LOOP
MEMCPY_QUAD_DONE:
SUBQ $4, CX
CMPQ CX, DX
JA MEMCPY_LONG_DONE
MOVL -4(SI)(CX*1), R8
MOVL R8, -4(DI)(CX*1)
ADDQ $4, CX
MEMCPY_LONG_DONE:
SUBQ $2, CX
CMPQ CX, DX
JA MEMCPY_WORD_DONE
MOVW -2(SI)(CX*1), R8
MOVW R8, -2(DI)(CX*1)
ADDQ $2, CX
MEMCPY_WORD_DONE:
SUBQ $1, CX
CMPQ CX, DX
JA MEMCPY_BYTE_DONE
MOVB -1(SI)(CX*1), R8
MOVB R8, -1(DI)(CX*1)
MEMCPY_BYTE_DONE:
MOVQ DI, AX // set return value
POPQ CX
POPQ R8
RET
// func _ClibMemcpy(dst, src unsafe.Pointer, n uint) unsafe.Pointer
TEXT ·_ClibMemcpy(SB), NOSPLIT|NOFRAME, $16-24
MOVQ arg1+0(FP), DI
MOVQ arg2+8(FP), SI
MOVQ arg3+16(FP), DX
CALL clib·_memcpy(SB)
MOVQ AX, ret+24(FP)
RET
// void *memset(void *str, int c, size_t n)
// DI = str, SI = c, DX = size
TEXT clib·_memset(SB), $16-0
PUSHQ CX
LONG $0x0101f669; WORD $0x0101 // imul esi, 0x1010101
MOVQ SI, CX
ROLQ $32, CX
ORQ CX, SI
XORQ CX, CX // clear register
MEMSET_QUAD_LOOP:
ADDQ $8, CX
CMPQ CX, DX
JA MEMSET_QUAD_DONE
MOVQ SI, -8(DI)(CX*1)
JMP MEMSET_QUAD_LOOP
MEMSET_QUAD_DONE:
SUBQ $4, CX
CMPQ CX, DX
JA MEMSET_LONG_DONE
MOVL SI, -4(DI)(CX*1)
ADDQ $4, CX
MEMSET_LONG_DONE:
SUBQ $2, CX
CMPQ CX, DX
JA MEMSET_WORD_DONE
MOVW SI, -2(DI)(CX*1)
ADDQ $2, CX
MEMSET_WORD_DONE:
SUBQ $1, CX
CMPQ CX, DX
JA MEMSET_BYTE_DONE
MOVB SI, -1(DI)(CX*1)
MEMSET_BYTE_DONE:
MOVQ DI, AX // set return value
POPQ CX
RET
// func _ClibMemset(dst unsafe.Pointer, c int, n uint) unsafe.Pointer
TEXT ·_ClibMemset(SB), NOSPLIT|NOFRAME, $16-24
MOVQ arg1+0(FP), DI
MOVQ arg2+8(FP), SI
MOVQ arg3+16(FP), DX
CALL clib·_memset(SB)
MOVQ AX, ret+24(FP)
RET
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