diff --git a/src/mapleall/maple_be/src/cg/aarch64/aarch64_cgfunc.cpp b/src/mapleall/maple_be/src/cg/aarch64/aarch64_cgfunc.cpp
index d10467c8a542633d0c60e641133058c8b84dade0..5eee49da8f517b481ed2022649b9b58efa2928aa 100644
--- a/src/mapleall/maple_be/src/cg/aarch64/aarch64_cgfunc.cpp
+++ b/src/mapleall/maple_be/src/cg/aarch64/aarch64_cgfunc.cpp
@@ -3896,9 +3896,9 @@ void AArch64CGFunc::SelectCvtInt2Int(const BaseNode *parent, Operand *&resOpnd,
       if (fsize > tsize) {
         if (IsSignedInteger(toType)) {
           if (origValue < 0) {
-            signValue = 0xFFFFFFFFFFFFFFFF & (1ULL << static_cast<uint32>(tsize));
+            signValue = 0xFFFFFFFFFFFFFFFFLL & (1ULL << static_cast<uint32>(tsize));
           }
-          newValue = static_cast<uint64>(origValue) & ((1ULL << static_cast<uint32>(tsize)) - 1u) &
+          newValue = (static_cast<uint64>(origValue) & ((1ULL << static_cast<uint32>(tsize)) - 1u)) |
                      static_cast<uint64>(signValue);
         } else {
           newValue = static_cast<uint64>(origValue) & ((1ULL << static_cast<uint32>(tsize)) - 1u);