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Do not declare fmax, fmin _FloatN, _FloatNx versions for C2X

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At the last WG14 meeting,
<http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2711.htm> was
accepted, which places more emphasis on the new fmaximum / fminimum
functions and less on the old fmax / fmin functions.  Some of the
changes are to examples, notes or otherwise don't require
implementation changes.  However, the changes include removing the
_FloatN / _FloatNx versions of the fmax and fmin functions that came
from TS 18661-3.

Thus, those function versions should only be declared under similar
conditions to the _FloatN / _FloatNx versions of fmaxmag and fminmag:
for _GNU_SOURCE and pre-C2X use of __STDC_WANT_IEC_60559_TYPES_EXT__,
but not for C2X without _GNU_SOURCE.

In turn this requires a tgmath.h change so that the corresponding
tgmath.h macros, for C2X with __STDC_WANT_IEC_60559_TYPES_EXT__ but
without _GNU_SOURCE, don't try to use function variants that aren't
declared.  (That issue doesn't arise for the tgmath.h macros for
fmaxmag and fminmag, because those aren't defined at all in those
circumstances unless __STDC_WANT_IEC_60559_BFP_EXT__ (from TS 18661-1
and not specified at all by C2X) is also defined, and in that case the
_FloatN / _FloatNx versions of fmaxmag and fminmag get declared - this
is only ever an issue when it's possible for some functions
corresponding to a type-generic-macro to be declared, and for _FloatN
/ _FloatNx functions in general to be declared, but without the
_FloatN / _FloatNx functions corresponding to that particular macro
being declared.)

Tested for x86_64.
This commit is contained in:
Joseph Myers 2021-09-29 18:20:32 +00:00
parent 79850e1025
commit 9bd9978639
2 changed files with 12 additions and 2 deletions
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2
math/bits/mathcalls.h
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@ -328,11 +328,13 @@ __MATHDECL (long long int,llround,, (_Mdouble_ __x));
/* Return positive difference between X and Y. */
__MATHCALL (fdim,, (_Mdouble_ __x, _Mdouble_ __y));
# if !__MATH_DECLARING_FLOATN || defined __USE_GNU || !__GLIBC_USE (ISOC2X)
/* Return maximum numeric value from X and Y. */
__MATHCALLX (fmax,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
/* Return minimum numeric value from X and Y. */
__MATHCALLX (fmin,, (_Mdouble_ __x, _Mdouble_ __y), (__const__));
# endif
/* Multiply-add function computed as a ternary operation. */
__MATHCALL (fma,, (_Mdouble_ __x, _Mdouble_ __y, _Mdouble_ __z));

12
math/tgmath.h
View File

@ -892,12 +892,20 @@
/* Return positive difference between X and Y. */
#define fdim(Val1, Val2) __TGMATH_BINARY_REAL_ONLY (Val1, Val2, fdim)
#if __GLIBC_USE (ISOC2X) && !defined __USE_GNU
/* Return maximum numeric value from X and Y. */
#define fmax(Val1, Val2) __TGMATH_BINARY_REAL_ONLY (Val1, Val2, fmax)
# define fmax(Val1, Val2) __TGMATH_BINARY_REAL_STD_ONLY (Val1, Val2, fmax)
/* Return minimum numeric value from X and Y. */
#define fmin(Val1, Val2) __TGMATH_BINARY_REAL_ONLY (Val1, Val2, fmin)
# define fmin(Val1, Val2) __TGMATH_BINARY_REAL_STD_ONLY (Val1, Val2, fmin)
#else
/* Return maximum numeric value from X and Y. */
# define fmax(Val1, Val2) __TGMATH_BINARY_REAL_ONLY (Val1, Val2, fmax)
/* Return minimum numeric value from X and Y. */
# define fmin(Val1, Val2) __TGMATH_BINARY_REAL_ONLY (Val1, Val2, fmin)
#endif
/* Multiply-add function computed as a ternary operation. */
#define fma(Val1, Val2, Val3) \