i965/fs: Add missing analysis invalidation in fixup_3src_null_dest().

Bug found by the liveness analysis validation pass that will be
introduced in a later commit.  fixup_3src_null_dest() was allocating
registers which makes the cached liveness analysis calculation
incomplete, so it must be invalidated.

Cc: [email protected]
Reviewed-by: Matt Turner <[email protected]>

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 42bc5e2a027..86d2bd92726 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -5190,12 +5190,18 @@ fs_visitor::optimize()
 void
 fs_visitor::fixup_3src_null_dest()
 {
+   bool progress = false;
+
    foreach_block_and_inst_safe (block, fs_inst, inst, cfg) {
       if (inst->is_3src() && inst->dst.is_null()) {
          inst->dst = fs_reg(VGRF, alloc.allocate(dispatch_width / 8),
                             inst->dst.type);
+         progress = true;
       }
    }
+
+   if (progress)
+      invalidate_live_intervals();
 }
 
 void