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- /* Copyright 2002 Andi Kleen, SuSE Labs */
- /*
- * ISO C memset - set a memory block to a byte value.
- *
- * rdi destination
- * rsi value (char)
- * rdx count (bytes)
- *
- * rax original destination
- */
- .globl __memset
- .globl memset
- .p2align 4
- memset:
- __memset:
- movq %rdi,%r9
- movl %edx,%r8d
- andl $7,%r8d
- movl %edx,%ecx
- shrl $3,%ecx
- /* expand byte value */
- movzbl %sil,%esi
- movabs $0x0101010101010101,%rax
- mulq %rsi /* with rax, clobbers rdx */
- rep
- stosq
- movl %r8d,%ecx
- rep
- stosb
- movq %r9,%rax
- ret
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