LLVM: Support global unsigned integer variable

integration_tests/CMakeLists.txt

@@ -428,6 +428,7 @@ RUN(NAME expr_20             LABELS cpython llvm c)
 RUN(NAME expr_01u            LABELS cpython llvm c NOFAST)
 RUN(NAME expr_02u            LABELS cpython llvm c NOFAST)
 RUN(NAME expr_03u            LABELS cpython llvm c NOFAST)
+RUN(NAME expr_04u            LABELS cpython llvm c)
 
 RUN(NAME loop_01             LABELS cpython llvm c)
 RUN(NAME loop_02             LABELS cpython llvm c wasm wasm_x86 wasm_x64)

integration_tests/expr_04u.py

@@ -0,0 +1,12 @@
+from lpython import u8, u16, u32, u64
+
+FLAG1 : u8 = u8(1) << u8(4)
+FLAG2 : u16 = u16(1) << u16(4)
+FLAG3: u32 = u32(1) << u32(4)
+FLAG4: u64 = u64(1) << u64(4)
+
+print(FLAG1, FLAG2, FLAG3, FLAG4)
+assert FLAG1 == u8(16)
+assert FLAG2 == u16(16)
+assert FLAG3 == u32(16)
+assert FLAG4 == u64(16)

src/libasr/codegen/asr_to_llvm.cpp

@@ -2353,8 +2353,9 @@ class ASRToLLVMVisitor : public ASR::BaseVisitor<ASRToLLVMVisitor>
             this->visit_expr_wrapper(x.m_symbolic_value, true);
             init_value = llvm::dyn_cast<llvm::Constant>(tmp);
         }
-        if (x.m_type->type == ASR::ttypeType::Integer) {
-            int a_kind = down_cast<ASR::Integer_t>(x.m_type)->m_kind;
+        if (x.m_type->type == ASR::ttypeType::Integer
+            || x.m_type->type == ASR::ttypeType::UnsignedInteger) {
+            int a_kind = ASRUtils::extract_kind_from_ttype_t(x.m_type);
             llvm::Type *type;
             int init_value_bits = 8*a_kind;
             type = llvm_utils->getIntType(a_kind);