/* 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
