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| 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/i386 | |
| parent | cf0ca8d52e1653d4aa4311a4649af8dc541ce6b4 (diff) | |
| download | glibc-79c52daf4740b00bef43e4f5a4281b3480459b38.zip glibc-79c52daf4740b00bef43e4f5a4281b3480459b38.tar.gz glibc-79c52daf4740b00bef43e4f5a4281b3480459b38.tar.bz2 | |
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/i386')
| -rw-r--r-- | sysdeps/i386/i686/fpu/multiarch/libm-test-ulps | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps b/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps index da6602f..9eb3088 100644 --- a/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps +++ b/sysdeps/i386/i686/fpu/multiarch/libm-test-ulps @@ -1424,6 +1424,30 @@ float: 1 float128: 1 ldouble: 1 +Function: "log2p1": +double: 1 +float: 1 +float128: 3 +ldouble: 2 + +Function: "log2p1_downward": +double: 1 +float: 1 +float128: 3 +ldouble: 4 + +Function: "log2p1_towardzero": +double: 1 +float: 1 +float128: 2 +ldouble: 4 + +Function: "log2p1_upward": +double: 1 +float: 1 +float128: 2 +ldouble: 5 + Function: "log_downward": double: 1 float128: 1 |