mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-25 06:20:06 +00:00
79c52daf47
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.
9 lines
95 B
C
9 lines
95 B
C
#include "nldbl-compat.h"
|
|
|
|
double
|
|
attribute_hidden
|
|
log2p1l (double x)
|
|
{
|
|
return log2p1 (x);
|
|
}
|