mesa: Make use of u_bit_scan{,64}.

Reviewed-by: Brian Paul <brianp@vmware.com>
Tested-by: Brian Paul <brianp@vmware.com>
Signed-off-by: Mathias Fröhlich <Mathias.Froehlich@web.de>

diff --git a/src/mesa/main/arrayobj.c b/src/mesa/main/arrayobj.c
index 897dac6e5db54cfa93e69c291abcc8bea36c2cc6..9c3451ec20367bc12489eed91062939dfe041822 100644 (file)
--- 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 a28c5831576575589869fc09ee9363d4caf1b783..e8aedde877752540b669590cc2d1cbbb8d454b7c 100644 (file)
--- 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;