i965/fs: Remove incorrect note of writing attr in centroid workaround.

This instruction doesn't update its IR destination, it just moves from
payload to f0.  This caused the dead code elimination pass I'm adding to
dead-code-eliminate the first step of interpolation.

Reviewed-by: Matt Turner <mattst88@gmail.com>

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index f9a50b1c18782aed6204385961c66417b76c7ff8..09817b7058b3cfbee5200a33a43dfe316400b872 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1064,7 +1064,7 @@ fs_visitor::emit_general_interpolation(ir_variable *ir)
                    * unlit, replace the centroid data with non-centroid
                    * data.
                    */
-                  emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS, attr);
+                  emit(FS_OPCODE_MOV_DISPATCH_TO_FLAGS);
                   fs_inst *inst = emit_linterp(attr, fs_reg(interp),
                                                interpolation_mode, false);
                   inst->predicate = BRW_PREDICATE_NORMAL;