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Implement C23 log2p1

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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.
This commit is contained in:
Joseph Myers
2024-05-20 13:41:39 +00:00
parent cf0ca8d52e
commit 79c52daf47
52 changed files with 3206 additions and 2 deletions
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8
sysdeps/unix/sysv/linux/riscv/rv32/libm.abilist
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@ -1028,3 +1028,11 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
GLIBC_2.40 log2p1 F
GLIBC_2.40 log2p1f F
GLIBC_2.40 log2p1f128 F
GLIBC_2.40 log2p1f32 F
GLIBC_2.40 log2p1f32x F
GLIBC_2.40 log2p1f64 F
GLIBC_2.40 log2p1f64x F
GLIBC_2.40 log2p1l F

8
sysdeps/unix/sysv/linux/riscv/rv64/libm.abilist
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@ -1125,3 +1125,11 @@ GLIBC_2.35 fminimumf64x F
GLIBC_2.35 fminimuml F
GLIBC_2.35 fsqrt F
GLIBC_2.35 fsqrtl F
GLIBC_2.40 log2p1 F
GLIBC_2.40 log2p1f F
GLIBC_2.40 log2p1f128 F
GLIBC_2.40 log2p1f32 F
GLIBC_2.40 log2p1f32x F
GLIBC_2.40 log2p1f64 F
GLIBC_2.40 log2p1f64x F
GLIBC_2.40 log2p1l F