i965/fs: Invalidate live intervals in passes that remove an instruction.

Since live intervals are based on ip, removing an instruction trashes
the intervals unless we were to go do some surgery.  These happen to
usually remove a use of a grf, so it's time to recalculate, anyway.

Reviewed-by: Kenneth Graunke <[email protected]>
NOTE: This is a candidate for the 8.0 release branch.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 7c1096b775e..175e36e4257 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1844,6 +1844,9 @@ fs_visitor::compute_to_mrf()
       }
    }
 
+   if (progress)
+      live_intervals_valid = false;
+
    return progress;
 }
 
@@ -1920,6 +1923,9 @@ fs_visitor::remove_duplicate_mrf_writes()
       }
    }
 
+   if (progress)
+      live_intervals_valid = false;
+
    return progress;
 }