glsl2: Don't dead-code eliminate a call where the return value is unused.

This showed up since the disabling of inlining at compile time, which
I apparently didn't regenerate piglit summary for.

Fixes:
glsl-deadcode-call.

1 files changed, 6 insertions, 1 deletions

diff --git a/src/glsl/ir_dead_code_local.cpp b/src/glsl/ir_dead_code_local.cpp
index b22cc558df6..4bbedf0ff94 100644
--- a/src/glsl/ir_dead_code_local.cpp
+++ b/src/glsl/ir_dead_code_local.cpp
@@ -156,7 +156,12 @@ process_assignment(void *ctx, ir_assignment *ir, exec_list *assignments)
       }
    }
 
-   /* Add this instruction to the assignment list. */
+   /* Add this instruction to the assignment list available to be removed.
+    * But not if the assignment has other side effects.
+    */
+   if (ir_has_call(ir))
+      return progress;
+
    assignment_entry *entry = new(ctx) assignment_entry(var, ir);
    assignments->push_tail(entry);