i965: Use compiler builtins when available

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

2 files changed, 8 insertions, 11 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_util.c b/src/mesa/drivers/dri/i965/brw_util.c
index e878da3850..d28d9abcb3 100644
--- a/src/mesa/drivers/dri/i965/brw_util.c
+++ b/src/mesa/drivers/dri/i965/brw_util.c
@@ -37,16 +37,6 @@
 #include "brw_util.h"
 #include "brw_defines.h"
 
-GLuint brw_count_bits(uint64_t val)
-{
-   GLuint i;
-   for (i = 0; val ; val >>= 1)
-      if (val & 1)
-	 i++;
-   return i;
-}
-
-
 GLuint brw_translate_blend_equation( GLenum mode )
 {
    switch (mode) {
diff --git a/src/mesa/drivers/dri/i965/brw_util.h b/src/mesa/drivers/dri/i965/brw_util.h
index 04f3175d3e..940a871550 100644
--- a/src/mesa/drivers/dri/i965/brw_util.h
+++ b/src/mesa/drivers/dri/i965/brw_util.h
@@ -35,7 +35,14 @@
 
 #include "main/mtypes.h"
 
-extern GLuint brw_count_bits(uint64_t val);
+#ifdef __GNUC__
+#define brw_count_bits(v) __builtin_popcount(v)
+#else
+static inline GLuint brw_count_bits(uint64_t v)
+{
+	return _mesa_popcount(v>>32) + _mesa_popcount(v&0xffffffff);
+}
+#endif
 extern GLuint brw_parameter_list_state_flags(struct gl_program_parameter_list *paramList);
 extern GLuint brw_translate_blend_factor( GLenum factor );
 extern GLuint brw_translate_blend_equation( GLenum mode );