From: Chad Versace <chad.versace@intel.com>
Date: Tue, 5 Jan 2016 18:39:21 +0000 (-0800)
Subject: isl: Prefer linear tiling for 1D surfaces
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=33f06842be7cc0ee51fa80e5442d18d02ca0e114;p=mesa.git

isl: Prefer linear tiling for 1D surfaces
---

diff --git a/src/isl/isl.c b/src/isl/isl.c
index f6b392cfe72..4a1c9f4a94a 100644
--- a/src/isl/isl.c
+++ b/src/isl/isl.c
@@ -166,6 +166,16 @@ isl_surf_choose_tiling(const struct isl_device *dev,
    /* Of the tiling modes remaining, choose the one that offers the best
     * performance.
     */
+
+   if (info->dim == ISL_SURF_DIM_1D) {
+      /* Prefer linear for 1D surfaces because they do not benefit from
+       * tiling. To the contrary, tiling leads to wasted memory and poor
+       * memory locality due to the swizzling and alignment restrictions
+       * required in tiled surfaces.
+       */
+      CHOOSE(ISL_TILING_LINEAR);
+   }
+
    CHOOSE(ISL_TILING_Ys);
    CHOOSE(ISL_TILING_Yf);
    CHOOSE(ISL_TILING_Y0);