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59 lines
1.5 KiB
ArmAsm
59 lines
1.5 KiB
ArmAsm
/* Compute maximum of two numbers, regarding NaN as missing argument.
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Copyright (C) 1997-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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-ldouble.h>
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.text
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ENTRY(__fmaxl)
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fldt 8(%rsp) // x
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fldt 24(%rsp) // x : y
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fucomi %st(1), %st
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jp 2f
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fcmovb %st(1), %st
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fstp %st(1)
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ret
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2: // Unordered.
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fucomi %st(0), %st
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jp 3f
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// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
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testb $0x40, 15(%rsp)
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jz 4f
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fstp %st(1)
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ret
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3: // st(0) is a NaN; st(1) may or may not be.
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fxch
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fucomi %st(0), %st
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jp 4f
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// st(1) is a NaN; st(0) is not. Test if st(1) is signaling.
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testb $0x40, 31(%rsp)
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jz 4f
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fstp %st(1)
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ret
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4: // Both arguments are NaNs, or one is a signaling NaN.
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faddp
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ret
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END(__fmaxl)
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libm_alias_ldouble (__fmax, fmax)
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