Initial import

libc/nexgen32e/wcscmp-k8.S

@@ -0,0 +1,68 @@
+/*-*- mode:asm; indent-tabs-mode:t; tab-width:8; coding:utf-8               -*-│
+│vi: set et ft=asm ts=8 sw=8 fenc=utf-8                                     :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2020 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ This program is free software; you can redistribute it and/or modify         │
+│ it under the terms of the GNU General Public License as published by         │
+│ the Free Software Foundation; version 2 of the License.                      │
+│                                                                              │
+│ This program is distributed in the hope that it will be useful, but          │
+│ WITHOUT ANY WARRANTY; without even the implied warranty of                   │
+│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU             │
+│ General Public License for more details.                                     │
+│                                                                              │
+│ You should have received a copy of the GNU General Public License            │
+│ along with this program; if not, write to the Free Software                  │
+│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA                │
+│ 02110-1301 USA                                                               │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/macros.h"
+.yoink	__FILE__
+
+/	Compares NUL-terminated wchar_t strings.
+/
+/	@param	rdi first string
+/	@param	rsi second string
+/	@return	0 if equal, etc.
+/	@note	wchar_t is a 32-bit signed type
+wcscmp$k8:
+	or	$-1,%rdx
+/	fallthrough
+	.endfn	wcscmp$k8,globl
+
+/	Compares NUL-terminated wchar_t strings w/ limit.
+/
+/	@param	rdi first string
+/	@param	rsi second string
+/	@param	rdx max shorts
+/	@return	0 if equal, etc.
+/	@note	wchar_t is a 32-bit signed type
+wcsncmp$k8:
+	.leafprologue
+	.profilable
+	push	%rbx
+	xor	%eax,%eax
+	cmp	%rdi,%rsi
+	je	3f
+	or	$-1,%rcx
+1:	add	$1,%rcx
+	cmp	%rcx,%rdx
+	je	3f
+	mov	(%rsi,%rcx,4),%ebx
+	cmp	(%rdi,%rcx,4),%ebx
+	jne	2f
+	test	%ebx,%ebx
+	jnz	1b
+2:	cmovl	.Lone(%rip),%eax
+	cmovg	.Lneg1(%rip),%eax
+3:	pop	%rbx
+	.leafepilogue
+	.endfn	wcsncmp$k8,globl
+
+	.rodata.cst4
+.Lone:	.long	1
+	.endobj	.Lone
+.Lneg1:	.long	-1
+	.endobj	.Lneg1
+	.previous