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- /*
- * Written by J.T. Conklin <jtc@netbsd.org>.
- * Public domain.
- * Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl@wasabisystems.com>
- */
- #include <machine/asm.h>
- ENTRY(memchr)
- movb %sil,%al /* set character to search for */
- movq %rdx,%rcx /* set length of search */
- testq %rcx,%rcx /* test for len == 0 */
- jz L1
- repne /* search! */
- scasb
- jne L1 /* scan failed, return null */
- leaq -1(%rdi),%rax /* adjust result of scan */
- ret
- L1: xorq %rax,%rax
- ret
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