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Makefile.inc
(117 B)
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bcmp.S
(2.6 KB)
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bcopy.c
(176 B)
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bzero.c
(152 B)
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memcmp.S
(4.17 KB)
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memcpy.S
(114 B)
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memmove.S
(5.71 KB)
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memset.S
(3.12 KB)
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stpcpy.S
(2.15 KB)
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strcat.S
(2.62 KB)
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strcmp.S
(1.16 KB)
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strcpy.c
(1.68 KB)
Editing: strcat.S
/* * Written by J.T. Conklin <jtc@acorntoolworks.com> * Public domain. */ #include <machine/asm.h> __FBSDID("$FreeBSD$"); #if 0 RCSID("$NetBSD: strcat.S,v 1.4 2004/07/26 18:51:21 drochner Exp $") #endif ENTRY(strcat) movq %rdi,%rax movabsq $0x0101010101010101,%r8 movabsq $0x8080808080808080,%r9 /* * Align destination to word boundary. * Consider unrolling loop? */ .Lscan: .Lscan_align: testb $7,%dil je .Lscan_aligned cmpb $0,(%rdi) je .Lcopy incq %rdi jmp .Lscan_align .align 4 .Lscan_aligned: .Lscan_loop: movq (%rdi),%rdx addq $8,%rdi subq %r8,%rdx testq %r9,%rdx je .Lscan_loop /* * In rare cases, the above loop may exit prematurely. We must * return to the loop if none of the bytes in the word equal 0. */ cmpb $0,-8(%rdi) /* 1st byte == 0? */ jne 1f subq $8,%rdi jmp .Lcopy 1: cmpb $0,-7(%rdi) /* 2nd byte == 0? */ jne 1f subq $7,%rdi jmp .Lcopy 1: cmpb $0,-6(%rdi) /* 3rd byte == 0? */ jne 1f subq $6,%rdi jmp .Lcopy 1: cmpb $0,-5(%rdi) /* 4th byte == 0? */ jne 1f subq $5,%rdi jmp .Lcopy 1: cmpb $0,-4(%rdi) /* 5th byte == 0? */ jne 1f subq $4,%rdi jmp .Lcopy 1: cmpb $0,-3(%rdi) /* 6th byte == 0? */ jne 1f subq $3,%rdi jmp .Lcopy 1: cmpb $0,-2(%rdi) /* 7th byte == 0? */ jne 1f subq $2,%rdi jmp .Lcopy 1: cmpb $0,-1(%rdi) /* 8th byte == 0? */ jne .Lscan_loop subq $1,%rdi /* * Align source to a word boundary. * Consider unrolling loop? */ .Lcopy: .Lcopy_align: testb $7,%sil je .Lcopy_aligned movb (%rsi),%dl incq %rsi movb %dl,(%rdi) incq %rdi testb %dl,%dl jne .Lcopy_align ret .align 4 .Lcopy_loop: movq %rdx,(%rdi) addq $8,%rdi .Lcopy_aligned: movq (%rsi),%rdx movq %rdx,%rcx addq $8,%rsi subq %r8,%rcx testq %r9,%rcx je .Lcopy_loop /* * In rare cases, the above loop may exit prematurely. We must * return to the loop if none of the bytes in the word equal 0. */ movb %dl,(%rdi) incq %rdi testb %dl,%dl /* 1st byte == 0? */ je .Ldone shrq $8,%rdx movb %dl,(%rdi) incq %rdi testb %dl,%dl /* 2nd byte == 0? */ je .Ldone shrq $8,%rdx movb %dl,(%rdi) incq %rdi testb %dl,%dl /* 3rd byte == 0? */ je .Ldone shrq $8,%rdx movb %dl,(%rdi) incq %rdi testb %dl,%dl /* 4th byte == 0? */ je .Ldone shrq $8,%rdx movb %dl,(%rdi) incq %rdi testb %dl,%dl /* 5th byte == 0? */ je .Ldone shrq $8,%rdx movb %dl,(%rdi) incq %rdi testb %dl,%dl /* 6th byte == 0? */ je .Ldone shrq $8,%rdx movb %dl,(%rdi) incq %rdi testb %dl,%dl /* 7th byte == 0? */ je .Ldone shrq $8,%rdx movb %dl,(%rdi) incq %rdi testb %dl,%dl /* 8th byte == 0? */ jne .Lcopy_aligned .Ldone: ret END(strcat) .section .note.GNU-stack,"",%progbits
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