anv: Drop the slow clear heuristic

This no longer provides a performance improvement.

Reviewed-by: Rohan Garg <rohan.garg@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33776>

src/intel/vulkan/anv_image.c

@@ -3548,21 +3548,6 @@ anv_can_fast_clear_color(const struct anv_cmd_buffer *cmd_buffer,
       return false;
    }
 
-   /* The fast-clear preamble and/or postamble flushes are more expensive than
-    * the flushes performed by BLORP during slow clears. Use a heuristic to
-    * determine if the cost of the flushes are worth fast-clearing. See
-    * genX(cmd_buffer_update_color_aux_op)() and blorp_exec_on_render().
-    * TODO: Tune for Xe2
-    */
-   if (cmd_buffer->device->info->verx10 <= 125 &&
-       cmd_buffer->num_independent_clears >= 16 &&
-       cmd_buffer->num_independent_clears >
-       cmd_buffer->num_dependent_clears * 2) {
-      anv_perf_warn(VK_LOG_OBJS(&image->vk.base),
-                    "Not enough back-to-back fast-clears. Slow clearing.");
-      return false;
-   }
-
    return true;
 }
 

src/intel/vulkan/anv_private.h

@@ -4352,10 +4352,6 @@ struct anv_cmd_buffer {
 
    struct anv_cmd_state                         state;
 
-   /* Fast-clear statistics. */
-   uint64_t                                     num_dependent_clears;
-   uint64_t                                     num_independent_clears;
-
    struct anv_address                           return_addr;
 
    /* Set by SetPerformanceMarkerINTEL, written into queries by CmdBeginQuery */

src/intel/vulkan/genX_cmd_buffer.c

@@ -3144,14 +3144,6 @@ genX(cmd_buffer_update_color_aux_op)(struct anv_cmd_buffer *cmd_buffer,
    } else {
       cmd_buffer->state.color_aux_op = next_aux_op;
    }
-
-   if (next_aux_op == ISL_AUX_OP_FAST_CLEAR) {
-      if (aux_op_clears(last_aux_op)) {
-         cmd_buffer->num_dependent_clears++;
-      } else {
-         cmd_buffer->num_independent_clears++;
-      }
-   }
 }
 
 static void