From: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Date: Tue, 28 Mar 2017 23:22:47 +0000 (+0200)
Subject: st/glsl_to_tgsi: teach the DCE pass about bindless samplers/images
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=77cbded9957836d573664a5c2b1d26cbf04988ad;p=mesa.git

st/glsl_to_tgsi: teach the DCE pass about bindless samplers/images

When a texture (or an image) instruction uses a bindless sampler
(respectively a bindless image), make sure the DCE pass won't
remove code when the resource is a temporary variable.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
---

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index e2505a709ae..834b6c6dec4 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5290,6 +5290,21 @@ glsl_to_tgsi_visitor::eliminate_dead_code(void)
                }
             }
          }
+
+         if (inst->resource.file == PROGRAM_TEMPORARY) {
+            int src_chans;
+
+            src_chans  = 1 << GET_SWZ(inst->resource.swizzle, 0);
+            src_chans |= 1 << GET_SWZ(inst->resource.swizzle, 1);
+            src_chans |= 1 << GET_SWZ(inst->resource.swizzle, 2);
+            src_chans |= 1 << GET_SWZ(inst->resource.swizzle, 3);
+
+            for (int c = 0; c < 4; c++) {
+               if (src_chans & (1 << c))
+                  writes[4 * inst->resource.index + c] = NULL;
+            }
+         }
+
          break;
       }