/*
	Copyright 2022 Gabriel Jensen

	This file is part of rgo.

	rgo is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

	rgo 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 Lesser General Public License for more details.

	You should have received a copy of the GNU Lesser General Public License along with rgo. If not, see <https://www.gnu.org/licenses/>. 
*/

#include <rgo.h>

.global rgo_streq

rgo_streq:
#if defined(__x86_64__)
	/*
		rdi: char const * lstr
		rsi: char const * rstr
	*/
	/* rdx: Address of the current input character. */
	movq %rdi,%rdx
	/* rcx: Address of the current output character. */
	movq %rsi,%rcx
	/* r8b: Current input character. */
	/* r9b: Current output character. */
.loop:
	movb (%rdx),%r8b
	movb (%rcx),%r9b
	cmpb %r8b,%r9b
	jne .neq
	testb %r8b,%r8b /* Check if we have reached the null-terminator. */
	jz .eq
	incq %rdx
	incq %rcx
	jmp .loop
.eq:
	mov $0x1,%rax
	ret
.neq:
	mov $0x0,%rax
	ret
#endif