This is _mesa_fls() for 64-bit values.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/main/imports.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/src/mesa/main/imports.h b/src/mesa/main/imports.h
index 29f2499..c4d917e 100644
--- a/src/mesa/main/imports.h
+++ b/src/mesa/main/imports.h
@@ -433,6 +433,30 @@ _mesa_fls(unsigned int n)
#endif
}
+/**
+ * Find the last (most significant) bit set in a uint64_t value.
+ *
+ * Essentially ffsll() in the reverse direction.
+ */
+static inline unsigned int
+_mesa_flsll(uint64_t n)
+{
+#ifdef HAVE___BUILTIN_CLZLL
+ return n == 0 ? 0 : 64 - __builtin_clzll(n);
+#else
+ unsigned int v = 1;
+
+ if (n == 0)
+ return 0;
+
+ while (n >>= 1)
+ v++;
+
+ return v;
+#endif
+}
+
+
extern GLhalfARB
_mesa_float_to_half(float f);
--
2.3.4
_______________________________________________
mesa-dev mailing list
mesa-dev@lists.freedesktop.org
http://lists.freedesktop.org/mailman/listinfo/mesa-dev
