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| author | Joseph Myers <joseph@codesourcery.com> | 2021-09-28 23:31:35 +0000 |
|---|---|---|
| committer | Joseph Myers <joseph@codesourcery.com> | 2021-09-28 23:31:35 +0000 |
| commit | 90f0ac10a74b2d43b5a65aab4be40565e359be43 (patch) | |
| tree | ab0e73d7c60a7255fa5e7c9cbe58e80c3eb8d9cd /sysdeps/powerpc/nofpu | |
| parent | 5bf07e1b3a74232bfb8332275110be1a5da50f83 (diff) | |
| download | glibc-90f0ac10a74b2d43b5a65aab4be40565e359be43.zip glibc-90f0ac10a74b2d43b5a65aab4be40565e359be43.tar.gz glibc-90f0ac10a74b2d43b5a65aab4be40565e359be43.tar.bz2 | |
Add fmaximum, fminimum functions
C2X adds new <math.h> functions for floating-point maximum and
minimum, corresponding to the new operations that were added in IEEE
754-2019 because of concerns about the old operations not being
associative in the presence of signaling NaNs. fmaximum and fminimum
handle NaNs like most <math.h> functions (any NaN argument means the
result is a quiet NaN). fmaximum_num and fminimum_num handle both
quiet and signaling NaNs the way fmax and fmin handle quiet NaNs (if
one argument is a number and the other is a NaN, return the number),
but still raise "invalid" for a signaling NaN argument, making them
exceptions to the normal rule that a function with a floating-point
result raising "invalid" also returns a quiet NaN. fmaximum_mag,
fminimum_mag, fmaximum_mag_num and fminimum_mag_num are corresponding
functions returning the argument with greatest or least absolute
value. All these functions also treat +0 as greater than -0. There
are also corresponding <tgmath.h> type-generic macros.
Add these functions to glibc. The implementations use type-generic
templates based on those for fmax, fmin, fmaxmag and fminmag, and test
inputs are based on those for those functions with appropriate
adjustments to the expected results. The RISC-V maintainers might
wish to add optimized versions of fmaximum_num and fminimum_num (for
float and double), since RISC-V (F extension version 2.2 and later)
provides instructions corresponding to those functions - though it
might be at least as useful to add architecture-independent built-in
functions to GCC and teach the RISC-V back end to expand those
functions inline, which is what you generally want for functions that
can be implemented with a single instruction.
Tested for x86_64 and x86, and with build-many-glibcs.py.
Diffstat (limited to 'sysdeps/powerpc/nofpu')
| -rw-r--r-- | sysdeps/powerpc/nofpu/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/powerpc/nofpu/Makefile b/sysdeps/powerpc/nofpu/Makefile index 80c762e..3b51ff6 100644 --- a/sysdeps/powerpc/nofpu/Makefile +++ b/sysdeps/powerpc/nofpu/Makefile @@ -50,4 +50,8 @@ CFLAGS-e_log2l.c += -fno-builtin-fabsl CFLAGS-e_remainderl.c += -fno-builtin-fabsl CFLAGS-s_fmaxmagl.c += -fno-builtin-fabsl CFLAGS-s_fminmagl.c += -fno-builtin-fabsl +CFLAGS-s_fmaximum_magl.c += -fno-builtin-fabsl +CFLAGS-s_fmaximum_mag_numl.c += -fno-builtin-fabsl +CFLAGS-s_fminimum_magl.c += -fno-builtin-fabsl +CFLAGS-s_fminimum_mag_numl.c += -fno-builtin-fabsl endif |