diff --git a/src/mir/RegAlloc.cpp b/src/mir/RegAlloc.cpp
index a8d6cd60..394106c5 100644
--- a/src/mir/RegAlloc.cpp
+++ b/src/mir/RegAlloc.cpp
@@ -1431,6 +1431,10 @@ namespace mir
           }
         }
 
+        // 大函数丢弃 move 偏好以保持分配稳定性
+        if (function.GetNumVRegs() > 150)
+          move_preferences.clear();
+
         std::vector<int> gp_alloc(GP_ALLOCATABLE, GP_ALLOCATABLE + GP_NUM_ALLOCATABLE);
         std::vector<int> fp_alloc(FP_ALLOCATABLE, FP_ALLOCATABLE + FP_NUM_ALLOCATABLE);
 
@@ -1719,6 +1723,9 @@ namespace mir
         }
       }
 
+      if (function.GetNumVRegs() > 150)
+        move_preferences.clear();
+
       std::vector<int> gp_alloc(GP_ALLOCATABLE, GP_ALLOCATABLE + GP_NUM_ALLOCATABLE);
       std::vector<int> fp_alloc(FP_ALLOCATABLE, FP_ALLOCATABLE + FP_NUM_ALLOCATABLE);
       InterferenceGraph gp_graph, fp_graph;