66 lines
1.8 KiB
ArmAsm
66 lines
1.8 KiB
ArmAsm
; Copyright (C) 2012-2017 Free Software Foundation, Inc.
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; Contributed by Red Hat.
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;
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; This file is free software; you can redistribute it and/or modify it
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; under the terms of the GNU General Public License as published by the
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; Free Software Foundation; either version 3, or (at your option) any
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; later version.
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;
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; This file is distributed in the hope that it will be useful, but
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; WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; General Public License for more details.
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;
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; Under Section 7 of GPL version 3, you are granted additional
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; permissions described in the GCC Runtime Library Exception, version
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; 3.1, as published by the Free Software Foundation.
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;
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; You should have received a copy of the GNU General Public License and
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; a copy of the GCC Runtime Library Exception along with this program;
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; see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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; <http://www.gnu.org/licenses/>.
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#include "vregs.h"
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;; int signbitf (float X)
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;; int signbit (double X)
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;; int signbitl (long double X)
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;;
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;; `signbit' returns a nonzero value if the value of X has its sign
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;; bit set.
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;;
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;; This is not the same as `x < 0.0', because IEEE 754 floating point
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;; allows zero to be signed. The comparison `-0.0 < 0.0' is false,
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;; but `signbit (-0.0)' will return a nonzero value.
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;----------------------------------------------------------------------
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.text
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START_FUNC _signbit
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START_ANOTHER_FUNC _signbitf
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;; X is at [sp+4]..[SP+7]
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;; result is in R8..R9
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movw r8, #0
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mov a, [sp+7]
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mov1 cy, a.7
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sknc
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movw r8, #1
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ret
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END_ANOTHER_FUNC _signbitf
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END_FUNC _signbit
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START_FUNC _signbitl
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;; X is at [sp+4]..[SP+7]
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;; result is in R8..R9
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movw r8, #0
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mov a, [sp+11]
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mov1 cy, a.7
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sknc
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movw r8, #1
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ret
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END_FUNC _signbitl
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