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-rw-r--r--misc/qefgcvt.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/misc/qefgcvt.c b/misc/qefgcvt.c
index faf788aa5d..63fc764121 100644
--- a/misc/qefgcvt.c
+++ b/misc/qefgcvt.c
@@ -28,8 +28,16 @@
#define MAXDIG (NDIGIT_MAX + 12)
#if LDBL_MANT_DIG == 64
# define NDIGIT_MAX 21
+#elif LDBL_MANT_DIG == 53
+# define NDIGIT_MAX 17
+#elif LDBL_MANT_DIG == 113
+# define NDIGIT_MAX 36
+#elif LDBL_MANT_DIG == 56
+# define NDIGIT_MAX 18
#else
-/* See IEEE 854 5.6, table 2 for this formula. */
+/* See IEEE 854 5.6, table 2 for this formula. Unfortunately we need a
+ compile time constant here, so we cannot use it. */
+# error "NDIGIT_MAX must be precomputed"
# define NDIGIT_MAX (lrint (ceil (M_LN2 / M_LN10 * LDBL_MANT_DIG + 1.0)))
#endif