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39bf95c1ba
clang warns:
../sysdeps/x86/fpu/powl_helper.c:233:3: error: absolute value function
'__builtin_fabsf' given an argument of type 'typeof (res)' (aka 'long
double') but has parameter of type 'float' which may cause truncation of
value [-Werror,-Wabsolute-value]
math_check_force_underflow (res);
^
./math-underflow.h:45:11: note: expanded from macro
'math_check_force_underflow'
if (fabs_tg (force_underflow_tmp) \
^
./math-underflow.h:27:20: note: expanded from macro 'fabs_tg'
#define fabs_tg(x) __MATH_TG ((x), (__typeof (x)) __builtin_fabs, (x))
^
../math/math.h:899:16: note: expanded from macro '__MATH_TG'
float: FUNC ## f ARGS, \
^
<scratch space>:73:1: note: expanded from here
__builtin_fabsf
^
Due the use of _Generic from TG_MATH.
Reviewed-by: Sam James <sam@gentoo.org>
89 lines
3.1 KiB
C
89 lines
3.1 KiB
C
/* Check for underflow and force underflow exceptions.
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Copyright (C) 2015-2025 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_UNDERFLOW_H
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#define _MATH_UNDERFLOW_H 1
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#include <float.h>
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#include <math.h>
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#include <math-barriers.h>
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#include <libc-diag.h>
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#define fabs_tg(x) __MATH_TG ((x), (__typeof (x)) __builtin_fabs, (x))
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/* These must be function-like macros because some __MATH_TG
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implementations macro-expand the function-name argument before
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concatenating a suffix to it. */
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#define min_of_type_f() FLT_MIN
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#define min_of_type_() DBL_MIN
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#define min_of_type_l() LDBL_MIN
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#define min_of_type_f128() FLT128_MIN
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#define min_of_type(x) __MATH_TG ((x), (__typeof (x)) min_of_type_, ())
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/* If X (which is not a NaN) is subnormal, force an underflow
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exception.
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clang issues a warning where _Generic is using a non expected
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builtin which may cause truncation of value.
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clang warns the value might be truncated due the use of _Generics. */
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#define math_check_force_underflow(x) \
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do \
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{ \
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DIAG_PUSH_NEEDS_COMMENT_CLANG; \
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DIAG_IGNORE_NEEDS_COMMENT_CLANG (18, "-Wabsolute-value"); \
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__typeof (x) force_underflow_tmp = (x); \
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if (fabs_tg (force_underflow_tmp) \
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< min_of_type (force_underflow_tmp)) \
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{ \
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__typeof (force_underflow_tmp) force_underflow_tmp2 \
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= force_underflow_tmp * force_underflow_tmp; \
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math_force_eval (force_underflow_tmp2); \
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} \
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DIAG_POP_NEEDS_COMMENT_CLANG; \
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} \
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while (0)
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/* Likewise, but X is also known to be nonnegative. */
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#define math_check_force_underflow_nonneg(x) \
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do \
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{ \
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__typeof (x) force_underflow_tmp = (x); \
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if (force_underflow_tmp \
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< min_of_type (force_underflow_tmp)) \
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{ \
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__typeof (force_underflow_tmp) force_underflow_tmp2 \
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= force_underflow_tmp * force_underflow_tmp; \
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math_force_eval (force_underflow_tmp2); \
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} \
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} \
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while (0)
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/* Likewise, for both real and imaginary parts of a complex
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result. */
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#define math_check_force_underflow_complex(x) \
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do \
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{ \
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__typeof (x) force_underflow_complex_tmp = (x); \
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math_check_force_underflow (__real__ force_underflow_complex_tmp); \
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math_check_force_underflow (__imag__ force_underflow_complex_tmp); \
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} \
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while (0)
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#endif /* math-underflow.h */
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