glibc/sysdeps/i386/i686
Joseph Myers 79c52daf47 Implement C23 log2p1
C23 adds various <math.h> function families originally defined in TS
18661-4.  Add the log2p1 functions (log2(1+x): like log1p, but for
base-2 logarithms).

This illustrates the intended structure of implementations of all
these function families: define them initially with a type-generic
template implementation.  If someone wishes to add type-specific
implementations, it is likely such implementations can be both faster
and more accurate than the type-generic one and can then override it
for types for which they are implemented (adding benchmarks would be
desirable in such cases to demonstrate that a new implementation is
indeed faster).

The test inputs are copied from those for log1p.  Note that these
changes make gen-auto-libm-tests depend on MPFR 4.2 (or later).

The bulk of the changes are fairly generic for any such new function.
(sysdeps/powerpc/nofpu/Makefile only needs changing for those
type-generic templates that use fabs.)

Tested for x86_64 and x86, and with build-many-glibcs.py.
2024-05-20 13:41:39 +00:00
..
fpu Implement C23 log2p1 2024-05-20 13:41:39 +00:00
multiarch i386: Use generic memrchr in libc (bug 31316) 2024-02-16 07:41:04 +01:00
nptl
add_n.S
dl-hash.h
isa.h
Makefile
memcmp.S
memcpy.S
memmove.S i686: Fix multiple definitions of __memmove_chk and __memset_chk 2024-05-02 11:51:10 +01:00
mempcpy.S
memset.S i686: Fix multiple definitions of __memmove_chk and __memset_chk 2024-05-02 11:51:10 +01:00
pthread_spin_trylock.S
strcmp.S