From 885f5974cdf65b59415837ae97f5a14ef1350670 Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Tue, 9 Dec 2025 19:20:15 +0100
Subject: feat: add gzip and new headers

---
 lib/libm/nextafter.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 lib/libm/nextafter.c

(limited to 'lib/libm/nextafter.c')

diff --git a/lib/libm/nextafter.c b/lib/libm/nextafter.c
new file mode 100644
index 00000000..f00857c3
--- /dev/null
+++ b/lib/libm/nextafter.c
@@ -0,0 +1,34 @@
+#include "libm.h"
+
+double nextafter(double x, double y)
+{
+	union {
+		double f;
+		uint64_t i;
+	} ux = { x }, uy = { y };
+	uint64_t ax, ay;
+	int e;
+
+	if (isnan(x) || isnan(y))
+		return x + y;
+	if (ux.i == uy.i)
+		return y;
+	ax = ux.i & -1ULL / 2;
+	ay = uy.i & -1ULL / 2;
+	if (ax == 0) {
+		if (ay == 0)
+			return y;
+		ux.i = (uy.i & 1ULL << 63) | 1;
+	} else if (ax > ay || ((ux.i ^ uy.i) & 1ULL << 63))
+		ux.i--;
+	else
+		ux.i++;
+	e = ux.i >> 52 & 0x7ff;
+	/* raise overflow if ux.f is infinite and x is finite */
+	if (e == 0x7ff)
+		FORCE_EVAL(x + x);
+	/* raise underflow if ux.f is subnormal or zero */
+	if (e == 0)
+		FORCE_EVAL(x * x + ux.f * ux.f);
+	return ux.f;
+}
-- 
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