67 lines
2.7 KiB
ArmAsm
67 lines
2.7 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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/ Compares NUL-terminated char16_t strings.
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/
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/ @param rdi first string
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/ @param rsi second string
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/ @return 0 if equal, etc.
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/ @note char16_t is an unsigned type
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/ @asyncsignalsafe
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strcmp16$k8:
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or $-1,%rdx
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/ fallthrough
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.endfn strcmp16$k8,globl,hidden
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/ Compares NUL-terminated char16_t strings w/ limit.
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/
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/ @param rdi first string
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/ @param rsi second string
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/ @param rdx max shorts
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/ @return 0 if equal, etc.
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/ @note char16_t is an unsigned type
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/ @asyncsignalsafe
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strncmp16$k8:
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.leafprologue
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.profilable
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push %rbx
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xor %eax,%eax
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xor %ebx,%ebx
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xor %ecx,%ecx
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cmp %rdi,%rsi
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je 1f
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test %rdx,%rdx
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jz 1f
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0: inc %rcx
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movzwl -2(%rdi,%rcx,2),%eax
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movzwl -2(%rsi,%rcx,2),%ebx
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cmp %rcx,%rdx
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je 1f
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cmp %ebx,%eax
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jne 1f
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test %eax,%eax
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jne 0b
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1: sub %ebx,%eax
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pop %rbx
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.leafepilogue
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.endfn strncmp16$k8,globl,hidden
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.source __FILE__
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