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54 lines
1.6 KiB
ArmAsm
54 lines
1.6 KiB
ArmAsm
/* Compute maximum of two numbers, regarding NaN as missing argument.
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Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Andreas Jaeger <aj@suse.de>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <libm-alias-double.h>
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.text
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ENTRY(__fmax)
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ucomisd %xmm0, %xmm1
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jp 1f // jump if unordered
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maxsd %xmm1, %xmm0
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jmp 2f
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1: ucomisd %xmm1, %xmm1 // Is xmm1 a NaN?
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jp 3f
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// xmm0 is a NaN; xmm1 is not. Test if xmm0 is signaling.
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movsd %xmm0, -8(%rsp)
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testb $0x8, -2(%rsp)
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jz 4f
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movsd %xmm1, %xmm0 // otherwise return xmm1
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ret
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3: // xmm1 is a NaN; xmm0 may or may not be.
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ucomisd %xmm0, %xmm0
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jp 4f
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// xmm1 is a NaN; xmm0 is not. Test if xmm1 is signaling.
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movsd %xmm1, -8(%rsp)
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testb $0x8, -2(%rsp)
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jz 4f
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ret
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4: // Both arguments are NaNs, or one is a signaling NaN.
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addsd %xmm1, %xmm0
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2: ret
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END(__fmax)
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libm_alias_double (__fmax, fmax)
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