ref: 18341c3b341f7f7c151673d2f79299f4074d378b
dir: /lib/std/memops-impl+posixy-x64.s/
/* std.memblit : (dst : byte#, src : byte#, len : std.size -> void) */ .globl _std$memblit .globl std$memblit _std$memblit: std$memblit: cmpq %rdi,%rsi movq %rdx,%rcx jz .done jg .fwdcpy movq %rsi,%rax subq %rdi,%rax cmpq %rax,%rcx jg .revcpy .fwdcpy: shrq $3,%rcx rep movsq movq %rdx,%rcx andq $7,%rcx rep movsb jmp .done .revcpy: std leaq -1(%rdx,%rsi),%rsi leaq -1(%rdx,%rdi),%rdi rep movsb cld .done: ret /* std.memfill : (dst : byte#, val : byte, len : std.size -> void) */ .globl _std$memfill .globl std$memfill _std$memfill: std$memfill: /* generate 8 bytes of fill */ movzbq %sil,%rbx mov $0x101010101010101,%rax imul %rbx,%rax /* and fill */ movq %rdx,%rcx shrq $3,%rcx rep stosq movq %rdx,%rcx andq $7,%rcx rep stosb ret /* std.memeq : (a : byte#, b : byte#, len : std.size -> bool) */ .globl _std$memeq .globl std$memeq _std$memeq: std$memeq: movq %rdx,%r8 andq $~0x7,%r8 jz .dotail .nextquad: movq (%rdi),%r9 movq (%rsi),%r10 xorq %r10,%r9 jnz .unequal addq $8,%rsi addq $8,%rdi subq $8,%r8 jnz .nextquad .dotail: andq $0x7,%rdx testq %rdx,%rdx jz .equal .nextbyte: movzbl (%rdi),%r9d movzbl (%rsi),%r10d xorl %r10d,%r9d jnz .unequal addq $1,%rsi addq $1,%rdi subq $1,%rdx jnz .nextbyte .equal: movq $1,%rax ret .unequal: movq $0,%rax ret