Add list comparison

integration_tests/CMakeLists.txt

@@ -457,6 +457,7 @@ RUN(NAME test_list_repeat    LABELS cpython llvm NOFAST)
 RUN(NAME test_list_reverse   LABELS cpython llvm)
 RUN(NAME test_list_pop       LABELS cpython llvm NOFAST) # TODO: Remove NOFAST from here.
 RUN(NAME test_list_pop2       LABELS cpython llvm NOFAST) # TODO: Remove NOFAST from here.
+RUN(NAME test_list_compare   LABELS cpython llvm)
 RUN(NAME test_tuple_01       LABELS cpython llvm c)
 RUN(NAME test_tuple_02       LABELS cpython llvm c NOFAST)
 RUN(NAME test_tuple_03       LABELS cpython llvm c)

integration_tests/test_list_compare.py

@@ -0,0 +1,53 @@
+from lpython import i32, f64
+
+def test_list_compare():
+    l1: list[i32] = [1, 2, 3]
+    l2: list[i32] = [1, 2, 3, 4]
+    l3: list[tuple[i32, f64, str]] = [(1, 2.0, 'a'), (3, 4.0, 'b')]
+    l4: list[tuple[i32, f64, str]] = [(1, 3.0, 'a')]
+    l5: list[list[str]] = [[''], ['']]
+    l6: list[str] = []
+    l7: list[str] = []
+    t1: tuple[i32, i32]
+    t2: tuple[i32, i32]
+    i: i32
+
+    assert l1 < l2 and l1 <= l2
+    assert not l1 > l2 and not l1 >= l2
+    i = l2.pop()
+    i = l2.pop()
+    assert l2 < l1 and l1 > l2 and l1 >= l2
+    assert not (l1 < l2)
+
+    l1 = [3, 4, 5]
+    l2 = [1, 6, 7]
+    assert l1 > l2 and l1 >= l2
+    assert not l1 < l2 and not l1 <= l2
+
+    l1 = l2
+    assert l1 == l2 and l1 <= l2 and l1 >= l2
+    assert not l1 < l2 and not l1 > l2
+
+    assert l4 > l3 and l4 >= l3
+    l4[0] = l3[0]
+    assert l4 < l3
+
+    for i in range(0, 10):
+        if i % 2 == 0:
+            l6.append('a')
+        else:
+            l7.append('a')
+        l5[0] = l6
+        l5[1] = l7
+        if i % 2 == 0:
+            assert l5[1 - i % 2] < l5[i % 2]
+            assert l5[1 - i % 2] <= l5[i % 2]
+            assert not l5[1 - i % 2] > l5[i % 2]
+            assert not l5[1 - i % 2] >= l5[i % 2]
+
+    t1 = (1, 2)
+    t2 = (2, 3)
+    assert t1 < t2 and t1 <= t2
+    assert not t1 > t2 and not t1 >= t2
+
+test_list_compare()

src/libasr/codegen/asr_to_llvm.cpp

@@ -1427,10 +1427,31 @@ class ASRToLLVMVisitor : public ASR::BaseVisitor<ASRToLLVMVisitor>
         this->visit_expr(*x.m_right);
         llvm::Value* right = tmp;
         ptr_loads = ptr_loads_copy;
-        tmp = llvm_utils->is_equal_by_value(left, right, *module,
-                ASRUtils::expr_type(x.m_left));
-        if (x.m_op == ASR::cmpopType::NotEq) {
-            tmp = builder->CreateNot(tmp);
+
+        ASR::ttype_t* int32_type = ASRUtils::TYPE(ASR::make_Integer_t(al, x.base.base.loc, 4));
+
+        if(x.m_op == ASR::cmpopType::Eq || x.m_op == ASR::cmpopType::NotEq) {
+            tmp = llvm_utils->is_equal_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left));
+            if (x.m_op == ASR::cmpopType::NotEq) {
+                tmp = builder->CreateNot(tmp);
+            }
+        }
+        else if(x.m_op == ASR::cmpopType::Lt) {
+            tmp = llvm_utils->is_ineq_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left), 0, int32_type);
+        }
+        else if(x.m_op == ASR::cmpopType::LtE) {
+            tmp = llvm_utils->is_ineq_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left), 1, int32_type);
+        }
+        else if(x.m_op == ASR::cmpopType::Gt) {
+            tmp = llvm_utils->is_ineq_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left), 2, int32_type);
+        }
+        else if(x.m_op == ASR::cmpopType::GtE) {
+            tmp = llvm_utils->is_ineq_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left), 3, int32_type);
         }
     }
 
@@ -1761,10 +1782,28 @@ class ASRToLLVMVisitor : public ASR::BaseVisitor<ASRToLLVMVisitor>
         this->visit_expr(*x.m_right);
         llvm::Value* right = tmp;
         ptr_loads = ptr_loads_copy;
-        tmp = llvm_utils->is_equal_by_value(left, right, *module,
-                ASRUtils::expr_type(x.m_left));
-        if (x.m_op == ASR::cmpopType::NotEq) {
-            tmp = builder->CreateNot(tmp);
+        if(x.m_op == ASR::cmpopType::Eq || x.m_op == ASR::cmpopType::NotEq) {
+            tmp = llvm_utils->is_equal_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left));
+            if (x.m_op == ASR::cmpopType::NotEq) {
+                tmp = builder->CreateNot(tmp);
+            }
+        }
+        else if(x.m_op == ASR::cmpopType::Lt) {
+            tmp = llvm_utils->is_ineq_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left), 0);
+        }
+        else if(x.m_op == ASR::cmpopType::LtE) {
+            tmp = llvm_utils->is_ineq_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left), 1);
+        }
+        else if(x.m_op == ASR::cmpopType::Gt) {
+            tmp = llvm_utils->is_ineq_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left), 2);
+        }
+        else if(x.m_op == ASR::cmpopType::GtE) {
+            tmp = llvm_utils->is_ineq_by_value(left, right, *module,
+                    ASRUtils::expr_type(x.m_left), 3);
         }
     }