now up to 256 bit!

Signed-off-by: Gediminas Jakutis <gediminas@varciai.lt>

1 files changed, 46 insertions, 0 deletions

diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..af819f4
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: LGPL-2.1-only */
+
+/* Copyright (C) 2021 Gediminas Jakutis */
+
+#ifndef ALGOS_UTIL_H_INCLUDED
+#define ALGOS_UTIL_H_INCLUDED
+
+#include "defs.h"
+
+static inline int is_less_equal(const field a, const field b) __attribute__((always_inline));
+
+static inline int is_less_equal(const field a, const field b)
+{
+	int ret;
+
+/* all sizes fitting in a primitive type */
+#if entry_field_size <= 64
+
+	ret = a <= b;
+
+/* composite of two 64bit */
+#elif entry_field_size == 128
+
+	if (unlikely(a.high == b.high)) {
+		ret = a.low <= b.low;
+	} else {
+		ret = a.high < b.high;
+	}
+
+/* composite of four 64bit */
+#elif entry_field_size == 256
+	if (likely(a.high != b.high)) {
+		ret = a.high < b.high;
+	} else if (likely(a.midhigh != b.midhigh)){
+		ret = a.midhigh < b.midhigh;
+	} else if (likely(a.midlow != b.midlow)){
+		ret = a.midlow < b.midlow;
+	} else {
+		ret = a.low <= b.low;
+	}
+#endif
+
+	return ret;
+}
+
+#endif /* ALGOS_UTIL_H_INCLUDED */