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-rw-r--r--math/tgmath.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/math/tgmath.h b/math/tgmath.h
index dbfa92d..d9ee3e3 100644
--- a/math/tgmath.h
+++ b/math/tgmath.h
@@ -874,6 +874,9 @@
#if __GLIBC_USE (IEC_60559_FUNCS_EXT_C23)
/* Compute exponent to base ten. */
#define exp10(Val) __TGMATH_UNARY_REAL_ONLY (Val, exp10)
+
+/* Return log2(1 + X). */
+#define log2p1(Val) __TGMATH_UNARY_REAL_ONLY (Val, log2p1)
#endif