[thirdparty/glibc.git] / sysdeps / x86_64 / fpu / s_truncl.S

/* Truncate long double value.
   Copyright (C) 1997-2021 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library 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 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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 the GNU C Library; if not, see
   <https://www.gnu.org/licenses/>.  */

#include <libm-alias-ldouble.h>
#include <machine/asm.h>

ENTRY(__truncl)
	fldt	8(%rsp)
	fnstenv	-28(%rsp)
	movl	$0xc00, %edx
	orl	-28(%rsp), %edx
	movl	%edx, -32(%rsp)
	fldcw	-32(%rsp)
	frndint
	fnstsw
	andl	$0x1, %eax
	orl	%eax, -24(%rsp)
	fldenv	-28(%rsp)
	ret
END(__truncl)
libm_alias_ldouble (__trunc, trunc)
Commit	Line	Data
5f93cd52	1	/* Truncate long double value.
2b778ceb	2	Copyright (C) 1997-2021 Free Software Foundation, Inc.
5f93cd52	3	This file is part of the GNU C Library.
5f93cd52 UD	4
	5	The GNU C Library is free software; you can redistribute it and/or
	6	modify it under the terms of the GNU Lesser General Public
	7	License as published by the Free Software Foundation; either
	8	version 2.1 of the License, or (at your option) any later version.
	9
	10	The GNU C Library is distributed in the hope that it will be useful,
	11	but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	13	Lesser General Public License for more details.
	14
	15	You should have received a copy of the GNU Lesser General Public
59ba27a6	16	License along with the GNU C Library; if not, see
5a82c748	17	<https://www.gnu.org/licenses/>. */
5f93cd52	18
f58e5f48	19	#include <libm-alias-ldouble.h>
5f93cd52 UD	20	#include <machine/asm.h>
	21
	22	ENTRY(__truncl)
	23	fldt 8(%rsp)
30dcf959	24	fnstenv -28(%rsp)
5f93cd52	25	movl $0xc00, %edx
30dcf959 JM	26	orl -28(%rsp), %edx
	27	movl %edx, -32(%rsp)
	28	fldcw -32(%rsp)
5f93cd52	29	frndint
30dcf959 JM	30	fnstsw
	31	andl $0x1, %eax
	32	orl %eax, -24(%rsp)
	33	fldenv -28(%rsp)
5f93cd52 UD	34	ret
5f93cd52 UD	35	END(__truncl)
f58e5f48	36	libm_alias_ldouble (__trunc, trunc)