/*- * Copyright (c) 2018 The FreeBSD Foundation * * This software was developed by Mateusz Guzik * under sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include __FBSDID("$FreeBSD$"); ENTRY(bcmp) cmpq $16,%rdx jae 5f 1: testq %rdx,%rdx je 3f xorl %ecx,%ecx 2: movzbl (%rdi,%rcx,1),%eax movzbl (%rsi,%rcx,1),%r8d cmpb %r8b,%al jne 4f addq $1,%rcx cmpq %rcx,%rdx jz 3f movzbl (%rdi,%rcx,1),%eax movzbl (%rsi,%rcx,1),%r8d cmpb %r8b,%al jne 4f addq $1,%rcx cmpq %rcx,%rdx jz 3f movzbl (%rdi,%rcx,1),%eax movzbl (%rsi,%rcx,1),%r8d cmpb %r8b,%al jne 4f addq $1,%rcx cmpq %rcx,%rdx jz 3f movzbl (%rdi,%rcx,1),%eax movzbl (%rsi,%rcx,1),%r8d cmpb %r8b,%al jne 4f addq $1,%rcx cmpq %rcx,%rdx jne 2b 3: xorl %eax,%eax ret 4: movl $1,%eax ret 5: cmpq $32,%rdx jae 7f 6: /* * 8 bytes */ movq (%rdi),%r8 movq (%rsi),%r9 cmpq %r8,%r9 jne 4b leaq 8(%rdi),%rdi leaq 8(%rsi),%rsi subq $8,%rdx cmpq $8,%rdx jae 6b jl 1b jmp 3b 7: /* * 32 bytes */ movq (%rsi),%r8 movq 8(%rsi),%r9 subq (%rdi),%r8 subq 8(%rdi),%r9 or %r8,%r9 jnz 4b movq 16(%rsi),%r8 movq 24(%rsi),%r9 subq 16(%rdi),%r8 subq 24(%rdi),%r9 or %r8,%r9 jnz 4b leaq 32(%rdi),%rdi leaq 32(%rsi),%rsi subq $32,%rdx cmpq $32,%rdx jae 7b jnz 1b jmp 3b END(bcmp) .section .note.GNU-stack,"",%progbits