i965/fs: add null_reg_df

Probably not needed since we fix the dst type of comparisons
automatically, but for consistency with the rest of null_reg_*
functions.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i965/brw_fs_builder.h b/src/mesa/drivers/dri/i965/brw_fs_builder.h
index 268ecc6..2087e58 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_fs_builder.h
+++ b/src/mesa/drivers/dri/i965/brw_fs_builder.h
@@ -197,6 +197,13 @@ namespace brw {
                                BRW_REGISTER_TYPE_F));
       }
 
+      dst_reg
+      null_reg_df() const
+      {
+         return dst_reg(retype(brw_null_vec(dispatch_width()),
+                               BRW_REGISTER_TYPE_DF));
+      }
+
       /**
        * Create a null register of signed integer type.
        */