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-__ffs.h
+++ b/lib/include/bitops-__ffs.h
@@ -0,0 +1,37 @@
+/* bitops-__ffs.h COPYRIGHT FUJITSU LIMITED 2014 */
+#ifndef INCLUDE_BITOPS___FFS_H
+#define INCLUDE_BITOPS___FFS_H
+
+static inline unsigned long __ffs(unsigned long word)
+{
+	int num = 0;
+
+	if (BITS_PER_LONG == 64) {
+		if ((word & 0xffffffff) == 0) {
+			num += 32;
+			word >>= 32;
+		}
+	}
+
+	if ((word & 0xffff) == 0) {
+		num += 16;
+		word >>= 16;
+	}
+	if ((word & 0xff) == 0) {
+		num += 8;
+		word >>= 8;
+	}
+	if ((word & 0xf) == 0) {
+		num += 4;
+		word >>= 4;
+	}
+	if ((word & 0x3) == 0) {
+		num += 2;
+		word >>= 2;
+	}
+	if ((word & 0x1) == 0)
+		num += 1;
+	return num;
+}
+
+#endif