glibc/sysdeps/ieee754/ldbl-opt/nldbl-log2p1.c

#include "nldbl-compat.h"

double
attribute_hidden
log2p1l (double x)
{
  return log2p1 (x);
}
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			`#include "nldbl-compat.h"`

			`double`
			`attribute_hidden`
			`log2p1l (double x)`
			`{`
			`return log2p1 (x);`
			`}`