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