mirror of git://sourceware.org/git/glibc.git
90f0ac10a7
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. |
||
|---|---|---|
| .. | ||
| be | ||
| bits | ||
| le | ||
| sh3 | ||
| sh4 | ||
| sys | ||
| Implies | ||
| Makefile | ||
| Versions | ||
| ____longjmp_chk.S | ||
| adaptive_spin_count.h | ||
| arch-syscall.h | ||
| atomic-machine.h | ||
| c++-types.data | ||
| clone.S | ||
| configure | ||
| configure.ac | ||
| jmp_buf-macros.h | ||
| kernel-features.h | ||
| kernel_sigaction.h | ||
| kernel_stat.h | ||
| localplt.data | ||
| lowlevel-atomic.h | ||
| makecontext.S | ||
| pipe.S | ||
| register-dump.h | ||
| shlib-versions | ||
| sigaltstack-offsets.sym | ||
| sigcontextinfo.h | ||
| syscall.S | ||
| syscalls.list | ||
| sysdep.S | ||
| sysdep.h | ||
| time64-compat.h | ||
| vfork.S | ||