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56c81132cc
The instructions xsxexpdp and xsxexpqp introduced on POWER9 extract the exponent from a double-precision and quad-precision floating-point respectively, thus they can be used to improve ilogb, ilogbf and ilogbf128.
63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/* Private inline math functions for powerpc.
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Copyright (C) 2006-2021 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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#ifndef _PPC_MATH_PRIVATE_H_
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#define _PPC_MATH_PRIVATE_H_
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#include <sysdep.h>
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#include <ldsodefs.h>
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#include <dl-procinfo.h>
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#include_next <math_private.h>
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#ifdef _ARCH_PWR9
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#if __GNUC_PREREQ (8, 0)
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# define _GL_HAS_BUILTIN_ILOGB 1
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#elif defined __has_builtin
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# define _GL_HAS_BUILTIN_ILOGB __has_builtin (__builtin_vsx_scalar_extract_exp)
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#else
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# define _GL_HAS_BUILTIN_ILOGB 0
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#endif
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#define __builtin_test_dc_ilogbf __builtin_test_dc_ilogb
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#define __builtin_ilogbf __builtin_ilogb
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#define __builtin_test_dc_ilogb(x, y) \
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__builtin_vsx_scalar_test_data_class_dp(x, y)
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#define __builtin_ilogb(x) __builtin_vsx_scalar_extract_exp(x) - 0x3ff
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#define __builtin_test_dc_ilogbf128(x, y) \
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__builtin_vsx_scalar_test_data_class_qp(x, y)
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#define __builtin_ilogbf128(x) __builtin_vsx_scalar_extract_expq(x) - 0x3fff
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#if __HAVE_DISTINCT_FLOAT128
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extern __always_inline _Float128
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__ieee754_sqrtf128 (_Float128 __x)
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{
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_Float128 __z;
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asm ("xssqrtqp %0,%1" : "=v" (__z) : "v" (__x));
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return __z;
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}
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#endif
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#else /* !_ARCH_PWR9 */
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#define _GL_HAS_BUILTIN_ILOGB 0
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#endif
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#endif /* _PPC_MATH_PRIVATE_H_ */
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