From bd5969fc876a10b18613302db7087ef3c40f18e1 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Thu, 7 Mar 2024 17:28:00 -0500
Subject: lib: Add mlibc

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 lib/mlibc/options/ansi/musl-generic-math/logbl.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)
 create mode 100644 lib/mlibc/options/ansi/musl-generic-math/logbl.c

(limited to 'lib/mlibc/options/ansi/musl-generic-math/logbl.c')

diff --git a/lib/mlibc/options/ansi/musl-generic-math/logbl.c b/lib/mlibc/options/ansi/musl-generic-math/logbl.c
new file mode 100644
index 0000000..962973a
--- /dev/null
+++ b/lib/mlibc/options/ansi/musl-generic-math/logbl.c
@@ -0,0 +1,16 @@
+#include <math.h>
+#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
+long double logbl(long double x)
+{
+	return logb(x);
+}
+#else
+long double logbl(long double x)
+{
+	if (!isfinite(x))
+		return x * x;
+	if (x == 0)
+		return -1/(x*x);
+	return ilogbl(x);
+}
+#endif
-- 
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