Mesa (master): radeonsi: don' t use fast color clear for small images even on APUs

[Marek Olšák]

Module: Mesa
Branch: master
Commit: f9cd6c502e1eea27f4a7904dfd75a6a0a23cb41b
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f9cd6c502e1eea27f4a7904dfd75a6a0a23cb41b

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Wed Dec 13 00:40:19 2017 +0100

radeonsi: don't use fast color clear for small images even on APUs

Increase the limit and handle non-square images better.

This makes glxgears 20% faster on APUs, and a little more on dGPUs.
We all use and love glxgears.

Tested-by: Dieter Nützel <Dieter at nuetzel-hh.de>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset at gmail.com>

---

 src/gallium/drivers/radeonsi/si_clear.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/src/gallium/drivers/radeonsi/si_clear.c b/src/gallium/drivers/radeonsi/si_clear.c
index 0ac83f446b..464b9d7ac5 100644
--- a/src/gallium/drivers/radeonsi/si_clear.c
+++ b/src/gallium/drivers/radeonsi/si_clear.c
@@ -425,12 +425,11 @@ static void si_do_fast_color_clear(struct si_context *sctx,
 		 * the eliminate pass can be higher than the benefit of fast
 		 * clear. The closed driver does this, but the numbers may differ.
 		 *
-		 * Always use fast clear on APUs.
+		 * This helps on both dGPUs and APUs, even small APUs like Mullins.
 		 */
-		bool too_small = sctx->screen->info.has_dedicated_vram &&
-				 tex->resource.b.b.nr_samples <= 1 &&
-				 tex->resource.b.b.width0 <= 256 &&
-				 tex->resource.b.b.height0 <= 256;
+		bool too_small = tex->resource.b.b.nr_samples <= 1 &&
+				 tex->resource.b.b.width0 *
+				 tex->resource.b.b.height0 <= 512 * 512;
 
 		/* Try to clear DCC first, otherwise try CMASK. */
 		if (vi_dcc_enabled(tex, 0)) {