usr: libc: Add math.h + musl math impl portexpt

Signed-off-by: Ian Moffett <ian@osmora.org>

1 files changed, 19 insertions, 0 deletions

diff --git a/lib/libc/src/musl-math/truncf.c b/lib/libc/src/musl-math/truncf.c
new file mode 100644
index 0000000..1a7d03c
--- /dev/null
+++ b/lib/libc/src/musl-math/truncf.c
@@ -0,0 +1,19 @@
+#include "libm.h"
+
+float truncf(float x)
+{
+	union {float f; uint32_t i;} u = {x};
+	int e = (int)(u.i >> 23 & 0xff) - 0x7f + 9;
+	uint32_t m;
+
+	if (e >= 23 + 9)
+		return x;
+	if (e < 9)
+		e = 1;
+	m = -1U >> e;
+	if ((u.i & m) == 0)
+		return x;
+	FORCE_EVAL(x + 0x1p120f);
+	u.i &= ~m;
+	return u.f;
+}