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

/* Truncate long double value.
   Copyright (C) 1997-2020 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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.
d614a753	2	Copyright (C) 1997-2020 Free Software Foundation, Inc.
5f93cd52 UD	3	This file is part of the GNU C Library.
	4	Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
	5
	6	The GNU C Library is free software; you can redistribute it and/or
	7	modify it under the terms of the GNU Lesser General Public
	8	License as published by the Free Software Foundation; either
	9	version 2.1 of the License, or (at your option) any later version.
	10
	11	The GNU C Library is distributed in the hope that it will be useful,
	12	but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	Lesser General Public License for more details.
	15
	16	You should have received a copy of the GNU Lesser General Public
59ba27a6	17	License along with the GNU C Library; if not, see
5a82c748	18	<https://www.gnu.org/licenses/>. */
5f93cd52	19
f58e5f48	20	#include <libm-alias-ldouble.h>
5f93cd52 UD	21	#include <machine/asm.h>
	22
	23	ENTRY(__truncl)
	24	fldt 8(%rsp)
30dcf959	25	fnstenv -28(%rsp)
5f93cd52	26	movl $0xc00, %edx
30dcf959 JM	27	orl -28(%rsp), %edx
	28	movl %edx, -32(%rsp)
	29	fldcw -32(%rsp)
5f93cd52	30	frndint
30dcf959 JM	31	fnstsw
	32	andl $0x1, %eax
	33	orl %eax, -24(%rsp)
	34	fldenv -28(%rsp)
5f93cd52 UD	35	ret
5f93cd52 UD	36	END(__truncl)
f58e5f48	37	libm_alias_ldouble (__trunc, trunc)