Fix unsigned to signed int cast

integration_tests/CMakeLists.txt

@@ -574,6 +574,7 @@ RUN(NAME test_unary_op_05    LABELS cpython llvm c) # unsigned unary minus, plus
 RUN(NAME test_unary_op_06    LABELS cpython llvm c) # unsigned unary bitnot
 RUN(NAME test_unsigned_01    LABELS cpython llvm c) # unsigned bitshift left, right
 RUN(NAME test_unsigned_02    LABELS cpython llvm c)
+RUN(NAME test_unsigned_03    LABELS cpython llvm c)
 RUN(NAME test_bool_binop     LABELS cpython llvm c)
 RUN(NAME test_issue_518      LABELS cpython llvm c NOFAST)
 RUN(NAME structs_01          LABELS cpython llvm c)

integration_tests/test_unsigned_02.py

@@ -1,10 +1,15 @@
-from lpython import u16, i32
+from lpython import u16, i32, u8, u32, u64
 
 # test issue 2170
 
-i : i32
-u : u16 = u16(32768)
-x : i32
+u_1 : u16 = u16(32768)
+u_2 : u8 = u8(24)
+u_3 : u32 = u32(32768)
+u_4 : u64 = u64(32768)
 
-for i in range(i32(u)):
-    x = i * 2
+assert u_1 == u16(32768)
+assert u_2 == u8(24)
+assert u_3 == u32(32768)
+assert u_4 == u64(32768)
+
+print(u_1, u_2, u_3, u_4)

integration_tests/test_unsigned_03.py

@@ -0,0 +1,19 @@
+from lpython import u16, i32, u8, u16, u64, i64, u32, i8
+
+# test issue 2174
+
+def f():
+    u: u16 = u16(32768)
+    assert i32(u) == 32768
+    u1: u8 = u8(23)
+    assert i8(u1) == i8(23)
+    assert u16(u1) == u16(23)
+    assert u32(u1) == u32(23)
+    assert u64(u1) == u64(23)
+    print(i8(u1), u16(u1), u32(u1), u64(u1))
+    assert i64(u1) == i64(23)
+    assert i64(u) == i64(32768)
+    assert i32(u1) == 23
+    print(i64(u), i32(u))
+
+f()

src/libasr/codegen/asr_to_llvm.cpp

@@ -6329,7 +6329,7 @@ class ASRToLLVMVisitor : public ASR::BaseVisitor<ASRToLLVMVisitor>
                     arg_kind != dest_kind )
                 {
                     if (dest_kind > arg_kind) {
-                        tmp = builder->CreateSExt(tmp, llvm_utils->getIntType(dest_kind));
+                        tmp = builder->CreateZExt(tmp, llvm_utils->getIntType(dest_kind));
                     } else {
                         tmp = builder->CreateTrunc(tmp, llvm_utils->getIntType(dest_kind));
                     }