Move include/ust/ to include/lttng/

[ust.git] / include / lttng / processor.h

diff --git a/include/lttng/processor.h b/include/lttng/processor.h
new file mode 100644 (file)
index 0000000..e3407ba
--- /dev/null
+++ b/include/lttng/processor.h
@@ -0,0 +1,88 @@
+/* Copyright (C) 2009  Pierre-Marc Fournier
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
+ */
+
+#ifndef UST_PROCESSOR_H
+#define UST_PROCESSOR_H
+
+#define ____cacheline_aligned __attribute__((aligned(CAA_CACHE_LINE_SIZE)))
+
+#ifdef __i386
+
+static inline int fls(int x)
+{
+        int r;
+        asm("bsrl %1,%0\n\t"
+            "cmovzl %2,%0"
+            : "=&r" (r) : "rm" (x), "rm" (-1));
+        return r + 1;
+}
+
+#elif defined(__x86_64)
+
+static inline int fls(int x)
+{
+        int r;
+        asm("bsrl %1,%0\n\t"
+            "cmovzl %2,%0"
+            : "=&r" (r) : "rm" (x), "rm" (-1));
+        return r + 1;
+}
+
+#elif defined(__PPC__)
+
+static __inline__ int fls(unsigned int x)
+{
+        int lz;
+
+        asm ("cntlzw %0,%1" : "=r" (lz) : "r" (x));
+        return 32 - lz;
+}
+
+#else /* arch-agnostic */
+
+static __inline__ int fls(unsigned 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
+
+#endif /* UST_PROCESSOR_H */