mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-15 04:20:28 +08:00
72 lines
1.6 KiB
ArmAsm
72 lines
1.6 KiB
ArmAsm
/* Compute maximum of two numbers, regarding NaN as missing argument.
|
|
Copyright (C) 1997-2023 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 <sysdep.h>
|
|
|
|
.text
|
|
ENTRY(__fmaxl)
|
|
fldt 16(%esp) // y
|
|
fxam
|
|
fnstsw
|
|
fldt 4(%esp) // y : x
|
|
|
|
andb $0x45, %ah
|
|
cmpb $0x01, %ah
|
|
je 2f // y == NaN
|
|
|
|
fxam
|
|
fnstsw
|
|
andb $0x45, %ah
|
|
cmpb $0x01, %ah
|
|
je 3f // x == NaN
|
|
|
|
fucom %st(1)
|
|
fnstsw
|
|
sahf
|
|
jnc 1f
|
|
|
|
fxch %st(1)
|
|
1: fstp %st(1)
|
|
|
|
ret
|
|
|
|
2: // st(1) is a NaN; st(0) may or may not be.
|
|
fxam
|
|
fnstsw
|
|
andb $0x45, %ah
|
|
cmpb $0x01, %ah
|
|
je 4f
|
|
// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
|
|
testb $0x40, 23(%esp)
|
|
jz 4f
|
|
fstp %st(1)
|
|
ret
|
|
|
|
3: // st(0) is a NaN; st(1) is not. Test if st(0) is signaling.
|
|
testb $0x40, 11(%esp)
|
|
jz 4f
|
|
fstp %st(0)
|
|
ret
|
|
|
|
4: // Both arguments are NaNs, or one is a signaling NaN.
|
|
faddp
|
|
ret
|
|
END(__fmaxl)
|
|
libm_alias_ldouble (__fmax, fmax)
|