X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=lib%2Ffls.h;fp=lib%2Ffls.h;h=dc7ecd0d629c94afe22a599739e76d68cb39922c;hb=eef323596c6c9d39456aba10954bb47c21982d96;hp=0000000000000000000000000000000000000000;hpb=78e7b3e7765a984742cf809c963499b92eca9c8a;p=fio.git

diff --git a/lib/fls.h b/lib/fls.h
new file mode 100644
index 00000000..dc7ecd0d
--- /dev/null
+++ b/lib/fls.h
@@ -0,0 +1,41 @@
+#ifndef _ASM_GENERIC_BITOPS_FLS_H_
+#define _ASM_GENERIC_BITOPS_FLS_H_
+
+/**
+ * fls - find last (most-significant) bit set
+ * @x: the word to search
+ *
+ * This is defined the same way as ffs.
+ * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
+ */
+
+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 /* _ASM_GENERIC_BITOPS_FLS_H_ */