From 30634165980deaeead9f4e71e0ff6a5c9d897776 Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 14 Jul 2025 22:39:34 -0400
Subject: usr: libc: Add math.h + musl math impl port

Signed-off-by: Ian Moffett <ian@osmora.org>
---
 lib/libc/src/musl-math/__signbit.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 lib/libc/src/musl-math/__signbit.c

(limited to 'lib/libc/src/musl-math/__signbit.c')

diff --git a/lib/libc/src/musl-math/__signbit.c b/lib/libc/src/musl-math/__signbit.c
new file mode 100644
index 0000000..e700b6b
--- /dev/null
+++ b/lib/libc/src/musl-math/__signbit.c
@@ -0,0 +1,13 @@
+#include "libm.h"
+
+// FIXME: macro in math.h
+int __signbit(double x)
+{
+	union {
+		double d;
+		uint64_t i;
+	} y = { x };
+	return y.i>>63;
+}
+
+
-- 
cgit v1.2.3