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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. |
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| .. | ||
| bits | ||
| htl | ||
| i686/multiarch | ||
| sys | ||
| ____longjmp_chk.S | ||
| __longjmp.S | ||
| c++-types.data | ||
| dl-machine.h | ||
| exc2signal.c | ||
| getcontext.S | ||
| Implies | ||
| init-first.c | ||
| intr-msg.h | ||
| ioperm.c | ||
| jmp_buf-macros.h | ||
| ld.abilist | ||
| libanl.abilist | ||
| libBrokenLocale.abilist | ||
| libc_malloc_debug.abilist | ||
| libc.abilist | ||
| libcrypt.abilist | ||
| libdl.abilist | ||
| libm.abilist | ||
| libnsl.abilist | ||
| libpthread.abilist | ||
| libresolv.abilist | ||
| librt.abilist | ||
| libutil.abilist | ||
| localplt.data | ||
| longjmp-ts.c | ||
| makecontext.S | ||
| Makefile | ||
| setcontext.S | ||
| sigcontextinfo.h | ||
| signal-defines.sym | ||
| sigreturn.c | ||
| static-start.S | ||
| swapcontext.S | ||
| tls.h | ||
| tlsdesc.sym | ||
| trampoline.c | ||
| ucontext_i.sym | ||
| Versions | ||
| vm_param.h | ||