ir3/sched: Use correct src index

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10591>

diff --git a/src/freedreno/ir3/ir3_sched.c b/src/freedreno/ir3/ir3_sched.c
index cec39bb..55f4c73 100644 (file)
--- a/src/freedreno/ir3/ir3_sched.c
+++ b/src/freedreno/ir3/ir3_sched.c
@@ -935,7 +935,17 @@ sched_node_add_dep(struct ir3_instruction *instr, struct ir3_instruction *src, i
 
        dag_add_edge(&sn->dag, &n->dag, NULL);
 
-       unsigned d = ir3_delayslots(src, instr, i, true);
+
+       /* There's a mismatch between the indices foreach_ssa_src_n uses and the
+        * indices that ir3_delayslots expects, and additionally we don't want to
+        * call it and get bogus answers on false dependencies.
+        */
+       unsigned d = 0;
+       if (i < instr->regs_count)
+               d = ir3_delayslots(src, instr, i + 1, true);
+       else if (src == instr->address)
+               d = ir3_delayslots(src, instr, 0, true);
+
        n->delay = MAX2(n->delay, d);
 }