diff options
| author | Joseph Myers <josmyers@redhat.com> | 2024-05-20 13:41:39 +0000 |
|---|---|---|
| committer | Joseph Myers <josmyers@redhat.com> | 2024-05-20 13:41:39 +0000 |
| commit | 79c52daf4740b00bef43e4f5a4281b3480459b38 (patch) | |
| tree | cc15e0f7402870b20dbebf8d539df033806d48b0 /sysdeps/ieee754 | |
| parent | cf0ca8d52e1653d4aa4311a4649af8dc541ce6b4 (diff) | |
| download | glibc-79c52daf4740b00bef43e4f5a4281b3480459b38.tar.gz glibc-79c52daf4740b00bef43e4f5a4281b3480459b38.tar.xz glibc-79c52daf4740b00bef43e4f5a4281b3480459b38.zip | |
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.
Diffstat (limited to 'sysdeps/ieee754')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm-compat/Versions | 3 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-opt/Makefile | 4 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-opt/nldbl-log2p1.c | 8 |
3 files changed, 14 insertions, 1 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm-compat/Versions b/sysdeps/ieee754/ldbl-128ibm-compat/Versions index c0679a1153..c9a74366fd 100644 --- a/sysdeps/ieee754/ldbl-128ibm-compat/Versions +++ b/sysdeps/ieee754/ldbl-128ibm-compat/Versions @@ -137,6 +137,9 @@ libm { __fminimum_magieee128; __fminimum_mag_numieee128; } + GLIBC_2.40 { + __log2p1ieee128; + } } libc { LDBL_IBM128_VERSION { diff --git a/sysdeps/ieee754/ldbl-opt/Makefile b/sysdeps/ieee754/ldbl-opt/Makefile index 74788ac999..80727613c7 100644 --- a/sysdeps/ieee754/ldbl-opt/Makefile +++ b/sysdeps/ieee754/ldbl-opt/Makefile @@ -51,7 +51,8 @@ libnldbl-calls = asprintf dprintf fprintf fscanf fwprintf fwscanf iovfscanf \ roundeven fromfp ufromfp fromfpx ufromfpx fadd dadd \ fdiv ddiv ffma dfma fmul dmul fsqrt dsqrt fsub dsub \ fmaximum fmaximum_mag fmaximum_num fmaximum_mag_num \ - fminimum fminimum_mag fminimum_num fminimum_mag_num + fminimum fminimum_mag fminimum_num fminimum_mag_num \ + log2p1 libnldbl-routines = $(libnldbl-calls:%=nldbl-%) libnldbl-inhibit-o = $(object-suffixes) libnldbl-static-only-routines = $(libnldbl-routines) @@ -151,6 +152,7 @@ CFLAGS-nldbl-log.c = -fno-builtin-logl CFLAGS-nldbl-log10.c = -fno-builtin-log10l CFLAGS-nldbl-log1p.c = -fno-builtin-log1pl CFLAGS-nldbl-log2.c = -fno-builtin-log2l +CFLAGS-nldbl-log2p1.c = -fno-builtin-log2p1l CFLAGS-nldbl-logb.c = -fno-builtin-logbl CFLAGS-nldbl-lrint.c = -fno-builtin-lrintl CFLAGS-nldbl-lround.c = -fno-builtin-lroundl diff --git a/sysdeps/ieee754/ldbl-opt/nldbl-log2p1.c b/sysdeps/ieee754/ldbl-opt/nldbl-log2p1.c new file mode 100644 index 0000000000..989c69e3d7 --- /dev/null +++ b/sysdeps/ieee754/ldbl-opt/nldbl-log2p1.c @@ -0,0 +1,8 @@ +#include "nldbl-compat.h" + +double +attribute_hidden +log2p1l (double x) +{ + return log2p1 (x); +} |