Mesa (master): mesa: Make use of u_bit_scan{,64}.

[Mathias Fröhlich]

Module: Mesa
Branch: master
Commit: ed2dae86aef759a6858f56d77eba77895bec5020
URL:    
http://cgit.freedesktop.org/mesa/mesa/commit/?id=ed2dae86aef759a6858f56d77eba77895bec5020

Author: Mathias Fröhlich <mathias.froehl...@web.de>
Date:   Thu Jun  9 06:35:34 2016 +0200

mesa: Make use of u_bit_scan{,64}.

Reviewed-by: Brian Paul <bri...@vmware.com>
Tested-by: Brian Paul <bri...@vmware.com>
Signed-off-by: Mathias Fröhlich <mathias.froehl...@web.de>

---

 src/mesa/main/arrayobj.c | 6 +++---
 src/mesa/main/buffers.c  | 4 ++--
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/mesa/main/arrayobj.c b/src/mesa/main/arrayobj.c
index 897dac6..9c3451e 100644
--- a/src/mesa/main/arrayobj.c
+++ b/src/mesa/main/arrayobj.c
@@ -52,6 +52,7 @@
 #include "mtypes.h"
 #include "varray.h"
 #include "main/dispatch.h"
+#include "util/bitscan.h"
 
 
 /**
@@ -342,13 +343,12 @@ _mesa_update_vao_client_arrays(struct gl_context *ctx,
    GLbitfield64 arrays = vao->NewArrays;
 
    while (arrays) {
+      const int attrib = u_bit_scan64(&arrays);
+
       struct gl_client_array *client_array;
       struct gl_vertex_attrib_array *attrib_array;
       struct gl_vertex_buffer_binding *buffer_binding;
 
-      GLint attrib = ffsll(arrays) - 1;
-      arrays ^= BITFIELD64_BIT(attrib);
-
       attrib_array = &vao->VertexAttrib[attrib];
       buffer_binding = &vao->VertexBinding[attrib_array->VertexBinding];
       client_array = &vao->_VertexAttrib[attrib];
diff --git a/src/mesa/main/buffers.c b/src/mesa/main/buffers.c
index a28c583..e8aedde 100644
--- a/src/mesa/main/buffers.c
+++ b/src/mesa/main/buffers.c
@@ -36,6 +36,7 @@
 #include "enums.h"
 #include "fbobject.h"
 #include "mtypes.h"
+#include "util/bitscan.h"
 
 
 #define BAD_MASK ~0u
@@ -595,13 +596,12 @@ _mesa_drawbuffers(struct gl_context *ctx, struct 
gl_framebuffer *fb,
    if (n > 0 && _mesa_bitcount(destMask[0]) > 1) {
       GLuint count = 0, destMask0 = destMask[0];
       while (destMask0) {
-         GLint bufIndex = ffs(destMask0) - 1;
+         const int bufIndex = u_bit_scan(&destMask0);
          if (fb->_ColorDrawBufferIndexes[count] != bufIndex) {
             updated_drawbuffers(ctx, fb);
             fb->_ColorDrawBufferIndexes[count] = bufIndex;
          }
          count++;
-         destMask0 &= ~(1 << bufIndex);
       }
       fb->ColorDrawBuffer[0] = buffers[0];
       fb->_NumColorDrawBuffers = count;

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