Mesa (master): radeonsi: use level mask for early out in si_blit_decompress_color

[Nicolai Hähnle]

Module: Mesa
Branch: master
Commit: 450ff0f0d5d603bb36ca3fbd9c871c9e8553baab
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=450ff0f0d5d603bb36ca3fbd9c871c9e8553baab

Author: Nicolai Hähnle <nicolai.haehnle at amd.com>
Date:   Fri Apr 22 15:27:33 2016 -0500

radeonsi: use level mask for early out in si_blit_decompress_color

Mostly for consistency with the other decompress functions, but note that
in the non-DCC decompress case, the function can now early-out in slightly
more (albeit probably rare) cases.

Reviewed-by: Marek Olšák <marek.olsak at amd.com>

---

 src/gallium/drivers/radeonsi/si_blit.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/gallium/drivers/radeonsi/si_blit.c b/src/gallium/drivers/radeonsi/si_blit.c
index 09f3207..32f953d 100644
--- a/src/gallium/drivers/radeonsi/si_blit.c
+++ b/src/gallium/drivers/radeonsi/si_blit.c
@@ -309,17 +309,19 @@ static void si_blit_decompress_color(struct pipe_context *ctx,
 		bool need_dcc_decompress)
 {
 	struct si_context *sctx = (struct si_context *)ctx;
-	unsigned layer, level, checked_last_layer, max_layer;
+	unsigned layer, checked_last_layer, max_layer;
+	unsigned level_mask =
+		u_bit_consecutive(first_level, last_level - first_level + 1);
 
-	if (!rtex->dirty_level_mask && !need_dcc_decompress)
+	if (!need_dcc_decompress)
+		level_mask &= rtex->dirty_level_mask;
+	if (!level_mask)
 		return;
 
-	for (level = first_level; level <= last_level; level++) {
+	while (level_mask) {
+		unsigned level = u_bit_scan(&level_mask);
 		void* custom_blend;
 
-		if (!(rtex->dirty_level_mask & (1 << level)) && !need_dcc_decompress)
-			continue;
-
 		if (rtex->dcc_offset && need_dcc_decompress) {
 			custom_blend = sctx->custom_blend_dcc_decompress;
 		} else if (rtex->fmask.size) {