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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 0d51ae60be..95f5f198ba 100644
--- a/math/tgmath.h
+++ b/math/tgmath.h
@@ -438,6 +438,9 @@
      __TGMATH_TERNARY_REAL_ONLY (Val1, Val2, Val3, fma)
 
 #if __GLIBC_USE (IEC_60559_BFP_EXT)
+/* Like ilogb, but returning long int.  */
+#define llogb(Val) __TGMATH_UNARY_REAL_RET_ONLY (Val, long int, llogb)
+
 /* Total order operation.  */
 # define totalorder(Val1, Val2) __TGMATH_BINARY_REAL_ONLY (Val1, Val2,	\
 							   totalorder)