/*
	Copyright 2022 Gabriel Jensen.
	This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
	If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/

#include <zap/priv.h>

#include <zap/math.h>

#include <stdint.h>

#if zap_priv_fastimpl
__asm__ (
	".globl zap_abs_c\n"
	".globl zap_abs_i\n"
	".globl zap_abs_l\n"
	".globl zap_abs_ll\n"
	".globl zap_abs_s\n"

	"zap_abs_c:\n"
		/*
			signed char val
		*/
#if defined(sus_arch_amd64) || defined(sus_arch_ia32)
		"movb %dil,%al\n"
		"sarb $0x3F,%al\n"
		"xorb %al,%dil\n"
		"subb %al,%dil\n"
		"movb %dil,%al\n"
		"ret\n"
#endif

	"zap_abs_i:\n"
		/*
			int val
		*/
#if defined(sus_arch_amd64) || defined(sus_arch_ia32)
		"movl %edi,%eax\n"
		"sarl $0x3F,%eax\n"
		"xorl %eax,%edi\n"
		"subl %eax,%edi\n"
		"movl %edi,%eax\n"
		"ret\n"
#endif

	"zap_abs_l:\n"
		/*
			long val
		*/
#if defined(sus_arch_amd64)
		"movq %rdi,%rax\n"
		"sarq $0x3F,%rax\n"
		"xorq %rax,%rdi\n"
		"subq %rax,%rdi\n"
		"movq %rdi,%rax\n"
		"ret\n"
#endif

	"zap_abs_ll:\n"
		/*
			long long val
		*/
#if defined(sus_arch_amd64)
		"movq %rdi,%rax\n"
		"sarq $0x3F,%rax\n"
		"xorq %rax,%rdi\n"
		"subq %rax,%rdi\n"
		"movq %rdi,%rax\n"
		"ret\n"
#endif

	"zap_abs_s:\n"
		/*
			short val
		*/
#if defined(sus_arch_amd64) || defined(sus_arch_ia32)
		"movw %di,%ax\n"
		"sarw $0x3F,%ax\n"
		"xorw %ax,%di\n"
		"subw %ax,%di\n"
		"movw %di,%ax\n"
		"ret\n"
#endif
);
#else
#define zap_local_abs(_typ,_sufx) \
	_typ zap_abs_ ## _sufx (_typ const _val) {return _val > (_typ)0x0 ? _val : -_val;}

zap_local_abs(signed char,c)
zap_local_abs(int,i)
zap_local_abs(long,l)
zap_local_abs(long long,ll)
zap_local_abs(short,s)

#endif