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220622dde5
This patch adds a new macro, libm_alias_finite, to define all _finite symbol. It sets all _finite symbol as compat symbol based on its first version (obtained from the definition at built generated first-versions.h). The <fn>f128_finite symbols were introduced in GLIBC 2.26 and so need special treatment in code that is shared between long double and float128. It is done by adding a list, similar to internal symbol redifinition, on sysdeps/ieee754/float128/float128_private.h. Alpha also needs some tricky changes to ensure we still emit 2 compat symbols for sqrt(f). Passes buildmanyglibc. Co-authored-by: Adhemerval Zanella <adhemerval.zanella@linaro.org> Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/* Helper macros for type generic function implementations within libm.
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Copyright (C) 2016-2020 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 _MATH_TYPE_MACROS
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#define _MATH_TYPE_MACROS
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/* Each type imports a header which is expected to
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define:
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M_LIT(x) - Paste the type specific suffix onto the constant x.
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M_MLIT(x) - Paste the type specific suffix used by the macro
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constants in math.h, i.e M_PI or M_PIl.
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M_PFX - The prefixed used by float.h macros like FLT_MANT_DIG.
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M_SUF(x) - Paste the the type specific suffix used by functions
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i.e expf expl exp.
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FLOAT - Resolves to the C typename of M_TYPE.
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CFLOAT - Resolves to the complex typename of M_TYPE.
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M_STRTO_NAN - Resolves to the internal libc function which
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converts a string into the appropriate FLOAT nan
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value.
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declare_mgen_alias(from,to)
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This exposes the appropriate symbol(s) for a
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function f of type FLOAT.
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declare_mgen_alias_r(from,to)
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This exposes the appropriate symbol(s) for a
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function f_r of type FLOAT.
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SET_NAN_PAYLOAD(flt, mant)
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Set the NaN payload bits of the variable FLT of type FLOAT to
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the mantissa MANT. */
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#ifndef M_PFX
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# error "M_PFX must be defined."
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#endif
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#ifndef M_LIT
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# error "M_LIT must be defined."
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#endif
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#ifndef M_MLIT
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# error "M_MLIT must be defined."
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#endif
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#ifndef M_SUF
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# error "M_SUF must be defined."
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#endif
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#ifndef FLOAT
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# error "FLOAT must be defined."
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#endif
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#ifndef CFLOAT
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# error "CFLOAT must be defined."
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#endif
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#ifndef declare_mgen_alias
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# error "declare_mgen_alias must be defined."
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#endif
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#ifndef declare_mgen_alias_r
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# error "declare_mgen_alias_r must be defined."
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#endif
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#ifndef SET_NAN_PAYLOAD
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# error "SET_NAN_PAYLOAD must be defined."
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#endif
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#ifndef declare_mgen_finite_alias_x
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#define declare_mgen_finite_alias_x(from, to) \
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libm_alias_finite (from, to)
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#endif
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#ifndef declare_mgen_finite_alias_s
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# define declare_mgen_finite_alias_s(from,to) \
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declare_mgen_finite_alias_x (from, to)
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#endif
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#ifndef declare_mgen_finite_alias
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# define declare_mgen_finite_alias(from, to) \
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declare_mgen_finite_alias_s (M_SUF (from), M_SUF (to))
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#endif
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#define __M_CONCAT(a,b) a ## b
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#define __M_CONCATX(a,b) __M_CONCAT(a,b)
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#define M_NAN M_SUF (__builtin_nan) ("")
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#define M_MIN_EXP __M_CONCATX (M_PFX, _MIN_EXP)
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#define M_MAX_EXP __M_CONCATX (M_PFX, _MAX_EXP)
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#define M_MIN __M_CONCATX (M_PFX, _MIN)
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#define M_MAX __M_CONCATX (M_PFX, _MAX)
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#define M_MANT_DIG __M_CONCATX (M_PFX, _MANT_DIG)
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#define M_HUGE_VAL (M_SUF (__builtin_huge_val) ())
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/* Helper macros for commonly used functions. */
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#define M_COPYSIGN M_SUF (copysign)
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#define M_FABS M_SUF (fabs)
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#define M_SINCOS M_SUF (__sincos)
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#define M_SCALBN M_SUF (__scalbn)
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#define M_LOG1P M_SUF (__log1p)
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#define M_ATAN2 M_SUF (__ieee754_atan2)
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#define M_COSH M_SUF (__ieee754_cosh)
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#define M_EXP M_SUF (__ieee754_exp)
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#define M_HYPOT M_SUF (__ieee754_hypot)
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#define M_LOG M_SUF (__ieee754_log)
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#define M_SINH M_SUF (__ieee754_sinh)
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#define M_SQRT M_SUF (sqrt)
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/* Needed to evaluate M_MANT_DIG below. */
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#include <float.h>
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#include <libm-alias-finite.h>
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/* Use a special epsilon value for IBM long double
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to avoid spurious overflows/underflows. */
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#if M_MANT_DIG != 106
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# define M_EPSILON __M_CONCATX (M_PFX, _EPSILON)
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#else
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# define M_EPSILON M_LIT (0x1p-106)
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#endif
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/* Enable overloading of function name to assist reuse. */
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#ifndef M_DECL_FUNC
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# define M_DECL_FUNC(f) M_SUF (f)
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#endif
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#endif /* _MATH_TYPE_MACROS */
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