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Implement C23 rootn.

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C23 adds various <math.h> function families originally defined in TS
18661-4.  Add the rootn functions, which compute the Yth root of X for
integer Y (with a domain error if Y is 0, even if X is a NaN).  The
integer exponent has type long long int in C23; it was intmax_t in TS
18661-4, and as with other interfaces changed after their initial
appearance in the TS, I don't think we need to support the original
version of the interface.

As with pown and compoundn, I strongly encourage searching for worst
cases for ulps error for these implementations (necessarily
non-exhaustively, given the size of the input space).  I also expect a
custom implementation for a given format could be much faster as well
as more accurate, although the implementation is simpler than those
for pown and compoundn.

This completes adding to glibc those TS 18661-4 functions (ignoring
DFP) that are included in C23.  See
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118592 regarding the C23
mathematical functions (not just the TS 18661-4 ones) missing built-in
functions in GCC, where such functions might usefully be added.

Tested for x86_64 and x86, and with build-many-glibcs.py.
This commit is contained in:
Joseph Myers
2025-05-14 10:51:46 +00:00
parent 36189c76fb
commit 06caf53adf
48 changed files with 14473 additions and 2 deletions
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8
sysdeps/unix/sysv/linux/sparc/sparc32/libm.abilist
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@@ -1379,6 +1379,14 @@ GLIBC_2.42 powrf32x F
GLIBC_2.42 powrf64 F
GLIBC_2.42 powrf64x F
GLIBC_2.42 powrl F
GLIBC_2.42 rootn F
GLIBC_2.42 rootnf F
GLIBC_2.42 rootnf128 F
GLIBC_2.42 rootnf32 F
GLIBC_2.42 rootnf32x F
GLIBC_2.42 rootnf64 F
GLIBC_2.42 rootnf64x F
GLIBC_2.42 rootnl F
GLIBC_2.42 rsqrt F
GLIBC_2.42 rsqrtf F
GLIBC_2.42 rsqrtf128 F

8
sysdeps/unix/sysv/linux/sparc/sparc64/libm.abilist
View File

@@ -1269,6 +1269,14 @@ GLIBC_2.42 powrf32x F
GLIBC_2.42 powrf64 F
GLIBC_2.42 powrf64x F
GLIBC_2.42 powrl F
GLIBC_2.42 rootn F
GLIBC_2.42 rootnf F
GLIBC_2.42 rootnf128 F
GLIBC_2.42 rootnf32 F
GLIBC_2.42 rootnf32x F
GLIBC_2.42 rootnf64 F
GLIBC_2.42 rootnf64x F
GLIBC_2.42 rootnl F
GLIBC_2.42 rsqrt F
GLIBC_2.42 rsqrtf F
GLIBC_2.42 rsqrtf128 F