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/trunc.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 lib/libc/src/musl-math/trunc.c

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

diff --git a/lib/libc/src/musl-math/trunc.c b/lib/libc/src/musl-math/trunc.c
new file mode 100644
index 0000000..d13711b
--- /dev/null
+++ b/lib/libc/src/musl-math/trunc.c
@@ -0,0 +1,19 @@
+#include "libm.h"
+
+double trunc(double x)
+{
+	union {double f; uint64_t i;} u = {x};
+	int e = (int)(u.i >> 52 & 0x7ff) - 0x3ff + 12;
+	uint64_t m;
+
+	if (e >= 52 + 12)
+		return x;
+	if (e < 12)
+		e = 1;
+	m = -1ULL >> e;
+	if ((u.i & m) == 0)
+		return x;
+	FORCE_EVAL(x + 0x1p120f);
+	u.i &= ~m;
+	return u.f;
+}
-- 
cgit v1.2.3