Implement C23 log10p1

C23 adds various <math.h> function families originally defined in TS
18661-4.  Add the log10p1 functions (log10(1+x): like log1p, but for
base-10 logarithms).

This is directly analogous to the log2p1 implementation (except that
whereas log2p1 has a smaller underflow range than log1p, log10p1 has a
larger underflow range).  The test inputs are copied from those for
log1p and log2p1, plus a few more inputs in that wider underflow
range.

Tested for x86_64 and x86, and with build-many-glibcs.py.

1 files changed, 2 insertions, 0 deletions

diff --git a/math/Versions b/math/Versions
index f6ddd2f4f7..633722f8c6 100644
--- a/math/Versions
+++ b/math/Versions
@@ -642,9 +642,11 @@ libm {
   GLIBC_2.40 {
     # Functions not involving _Float64x or _Float128, for all configurations.
     log2p1; log2p1f; log2p1l; log2p1f32; log2p1f64; log2p1f32x;
+    log10p1; log10p1f; log10p1l; log10p1f32; log10p1f64; log10p1f32x;
     logp1; logp1f; logp1l; logp1f32; logp1f64; logp1f32x;
     # Functions involving _Float64x or _Float128, for some configurations.
     log2p1f64x; log2p1f128;
+    log10p1f64x; log10p1f128;
     logp1f64x; logp1f128;
   }
 }