mirror of
https://github.com/intel/isa-l.git
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82 lines
2.6 KiB
NASM
82 lines
2.6 KiB
NASM
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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; Copyright(c) 2011-2016 Intel Corporation All rights reserved.
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;
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; Redistribution and use in source and binary forms, with or without
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; modification, are permitted provided that the following conditions
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; are met:
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; * Redistributions of source code must retain the above copyright
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; notice, this list of conditions and the following disclaimer.
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; * Redistributions in binary form must reproduce the above copyright
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; notice, this list of conditions and the following disclaimer in
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; the documentation and/or other materials provided with the
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; distribution.
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; * Neither the name of Intel Corporation nor the names of its
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; contributors may be used to endorse or promote products derived
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; from this software without specific prior written permission.
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;
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; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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; LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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; OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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%include "reg_sizes.asm"
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;
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;; detect_repeated_char buf, size
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%ifidn __OUTPUT_FORMAT__, elf64
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%define buf rdi
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%define size rsi
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%elifidn __OUTPUT_FORMAT__, win64
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%define buf rcx
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%define size rdx
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%endif ; output formats
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%define tmp r10
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global detect_repeated_char
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detect_repeated_char:
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;; replicate the 1st byte to 8 bytes
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xor tmp, tmp
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xor rax, rax
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mov al, [buf]
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mov ah, al
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mov tmp %+ w, ax
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shl tmp, 16
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or eax, tmp %+ d
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mov tmp %+ d, eax
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shl tmp, 32
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or rax, tmp
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;; detect the 8K input
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lea tmp, [buf + size]
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_loop:
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cmp rax, [buf]
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jne _fail
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add buf, 8
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cmp buf, tmp
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jb _loop
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shr rax, 56
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jmp _end
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_fail:
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mov rax, -1
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_end:
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ret
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%undef buf
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%undef size
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%undef tmp
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