From: Bryan Cain <bryancain3@gmail.com>
Date: Sat, 25 Jun 2011 04:17:30 +0000 (-0500)
Subject: glsl_to_tgsi: improve eliminate_dead_code_advanced()
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=71cbc9e3c4c9ef6090ee31e87601ae64af26321e;p=mesa.git

glsl_to_tgsi: improve eliminate_dead_code_advanced()
---

diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 13573fc1b94..15a1a3c51c4 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -3379,6 +3379,15 @@ glsl_to_tgsi_visitor::eliminate_dead_code_advanced(void)
       }
    }
 
+   /* Anything still in the write array at this point is dead code. */
+   for (int r = 0; r < this->next_temp; r++) {
+      for (int c = 0; c < 4; c++) {
+         glsl_to_tgsi_instruction *inst = writes[4 * r + c];
+         if (inst)
+            inst->dead_mask |= (1 << c);
+      }
+   }
+
    /* Now actually remove the instructions that are completely dead and update
     * the writemask of other instructions with dead channels.
     */