fix REQ-51

2016-03-26 12:23:16 +09:00
parent a11479eba8
commit b0096a2740
10 changed files with 249 additions and 109 deletions
--- a/lib/include/bitops-fls.h
+++ b/lib/include/bitops-fls.h
@ -0,0 +1,36 @@
+/* bitops-fls.h COPYRIGHT FUJITSU LIMITED 2014 */
+#ifndef INCLUDE_BITOPS_FLS_H
+#define INCLUDE_BITOPS_FLS_H
+
+static inline int fls(int x)
+{
+	int r = 32;
+	if (!x) {
+		return 0;
+	}
+
+	if (!(x & 0xffff0000u)) {
+		x <<= 16;
+		r -= 16;
+	}
+	if (!(x & 0xff000000u)) {
+		x <<= 8;
+		r -= 8;
+	}
+	if (!(x & 0xf0000000u)) {
+		x <<= 4;
+		r -= 4;
+	}
+	if (!(x & 0xc0000000u)) {
+		x <<= 2;
+		r -= 2;
+	}
+	if (!(x & 0x80000000u)) {
+		x <<= 1;
+		r -= 1;
+	}
+	return r;
+}
+
+#endif
+