diff --git a/src/amd/compiler/aco_spill.cpp b/src/amd/compiler/aco_spill.cpp
index 37d6b7408bb..ec29cd7efc0 100644
--- a/src/amd/compiler/aco_spill.cpp
+++ b/src/amd/compiler/aco_spill.cpp
@@ -548,6 +548,7 @@ init_live_in_vars(spill_ctx& ctx, Block* block, unsigned block_idx)
 
       Block::edge_vec& preds =
          phi->opcode == aco_opcode::p_phi ? block->logical_preds : block->linear_preds;
+      bool is_all_undef = true;
       bool is_all_spilled = true;
       bool is_partial_spill = false;
       for (unsigned i = 0; i < phi->operands.size(); i++) {
@@ -557,9 +558,10 @@ init_live_in_vars(spill_ctx& ctx, Block* block, unsigned block_idx)
                         ctx.spills_exit[preds[i]].count(phi->operands[i].getTemp());
          is_all_spilled &= spilled;
          is_partial_spill |= spilled;
+         is_all_undef = false;
       }
 
-      if (is_all_spilled) {
+      if (is_all_spilled && !is_all_undef) {
          /* The phi is spilled at all predecessors. Keep it spilled. */
          ctx.add_to_spills(phi->definitions[0].getTemp(), ctx.spills_entry[block_idx]);
          spilled_registers += phi->definitions[0].getTemp();