diff --git a/nac3core/src/toplevel/builtins.rs b/nac3core/src/toplevel/builtins.rs
index 97d9f8ff4..3d2f4b717 100644
--- a/nac3core/src/toplevel/builtins.rs
+++ b/nac3core/src/toplevel/builtins.rs
@@ -1,12 +1,14 @@
 use std::cell::RefCell;
-
 use inkwell::{IntPredicate, FloatPredicate};
-
 use crate::symbol_resolver::SymbolValue;
-
 use super::*;
 
-pub fn get_built_ins(primitives: &mut (PrimitiveStore, Unifier)) -> Vec<(Arc<RwLock<TopLevelDef>>, Option<Stmt>)> {
+type BuiltinInfo = (
+    Vec<(Arc<RwLock<TopLevelDef>>, Option<Stmt>)>,
+    &'static [&'static str]
+);
+
+pub fn get_built_ins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
     let int32 = primitives.0.int32;
     let int64 = primitives.0.int64;
     let float = primitives.0.float;
@@ -400,8 +402,172 @@ pub fn get_built_ins(primitives: &mut (PrimitiveStore, Unifier)) -> Vec<(Arc<RwL
                 },
             )))),
         })),
+        Arc::new(RwLock::new(TopLevelDef::Function {
+            name: "floor".into(),
+            simple_name: "floor".into(),
+            signature: primitives.1.add_ty(TypeEnum::TFunc(RefCell::new(FunSignature {
+                args: vec![FuncArg { name: "_".into(), ty: float, default_value: None }],
+                ret: int32,
+                vars: Default::default(),
+            }))),
+            var_id: Default::default(),
+            instance_to_symbol: Default::default(),
+            instance_to_stmt: Default::default(),
+            resolver: None,
+            codegen_callback: Some(Arc::new(GenCall::new(Box::new(|ctx, _, _, args| {
+                let arg = args[0].1;
+                let floor_intrinsic =
+                    ctx.module.get_function("llvm.floor.f64").unwrap_or_else(|| {
+                        let float = ctx.ctx.f64_type();
+                        let fn_type = float.fn_type(&[float.into()], false);
+                        ctx.module.add_function("llvm.floor.f64", fn_type, None)
+                    });
+                let val = ctx
+                    .builder
+                    .build_call(floor_intrinsic, &[arg], "floor")
+                    .try_as_basic_value()
+                    .left()
+                    .unwrap();
+                Some(
+                    ctx.builder
+                        .build_float_to_signed_int(
+                            val.into_float_value(),
+                            ctx.ctx.i32_type(),
+                            "fptosi",
+                        )
+                        .into(),
+                )
+            })))),
+        })),
+        Arc::new(RwLock::new(TopLevelDef::Function {
+            name: "floor64".into(),
+            simple_name: "floor64".into(),
+            signature: primitives.1.add_ty(TypeEnum::TFunc(RefCell::new(FunSignature {
+                args: vec![FuncArg { name: "_".into(), ty: float, default_value: None }],
+                ret: int64,
+                vars: Default::default(),
+            }))),
+            var_id: Default::default(),
+            instance_to_symbol: Default::default(),
+            instance_to_stmt: Default::default(),
+            resolver: None,
+            codegen_callback: Some(Arc::new(GenCall::new(Box::new(|ctx, _, _, args| {
+                let arg = args[0].1;
+                let floor_intrinsic =
+                    ctx.module.get_function("llvm.floor.f64").unwrap_or_else(|| {
+                        let float = ctx.ctx.f64_type();
+                        let fn_type = float.fn_type(&[float.into()], false);
+                        ctx.module.add_function("llvm.floor.f64", fn_type, None)
+                    });
+                let val = ctx
+                    .builder
+                    .build_call(floor_intrinsic, &[arg], "floor")
+                    .try_as_basic_value()
+                    .left()
+                    .unwrap();
+                Some(
+                    ctx.builder
+                        .build_float_to_signed_int(
+                            val.into_float_value(),
+                            ctx.ctx.i64_type(),
+                            "fptosi",
+                        )
+                        .into(),
+                )
+            })))),
+        })),
+        Arc::new(RwLock::new(TopLevelDef::Function {
+            name: "ceil".into(),
+            simple_name: "ceil".into(),
+            signature: primitives.1.add_ty(TypeEnum::TFunc(RefCell::new(FunSignature {
+                args: vec![FuncArg { name: "_".into(), ty: float, default_value: None }],
+                ret: int32,
+                vars: Default::default(),
+            }))),
+            var_id: Default::default(),
+            instance_to_symbol: Default::default(),
+            instance_to_stmt: Default::default(),
+            resolver: None,
+            codegen_callback: Some(Arc::new(GenCall::new(Box::new(|ctx, _, _, args| {
+                let arg = args[0].1;
+                let ceil_intrinsic =
+                    ctx.module.get_function("llvm.ceil.f64").unwrap_or_else(|| {
+                        let float = ctx.ctx.f64_type();
+                        let fn_type = float.fn_type(&[float.into()], false);
+                        ctx.module.add_function("llvm.ceil.f64", fn_type, None)
+                    });
+                let val = ctx
+                    .builder
+                    .build_call(ceil_intrinsic, &[arg], "ceil")
+                    .try_as_basic_value()
+                    .left()
+                    .unwrap();
+                Some(
+                    ctx.builder
+                        .build_float_to_signed_int(
+                            val.into_float_value(),
+                            ctx.ctx.i32_type(),
+                            "fptosi",
+                        )
+                        .into(),
+                )
+            })))),
+        })),
+        Arc::new(RwLock::new(TopLevelDef::Function {
+            name: "ceil64".into(),
+            simple_name: "ceil64".into(),
+            signature: primitives.1.add_ty(TypeEnum::TFunc(RefCell::new(FunSignature {
+                args: vec![FuncArg { name: "_".into(), ty: float, default_value: None }],
+                ret: int64,
+                vars: Default::default(),
+            }))),
+            var_id: Default::default(),
+            instance_to_symbol: Default::default(),
+            instance_to_stmt: Default::default(),
+            resolver: None,
+            codegen_callback: Some(Arc::new(GenCall::new(Box::new(|ctx, _, _, args| {
+                let arg = args[0].1;
+                let ceil_intrinsic =
+                    ctx.module.get_function("llvm.ceil.f64").unwrap_or_else(|| {
+                        let float = ctx.ctx.f64_type();
+                        let fn_type = float.fn_type(&[float.into()], false);
+                        ctx.module.add_function("llvm.ceil.f64", fn_type, None)
+                    });
+                let val = ctx
+                    .builder
+                    .build_call(ceil_intrinsic, &[arg], "ceil")
+                    .try_as_basic_value()
+                    .left()
+                    .unwrap();
+                Some(
+                    ctx.builder
+                        .build_float_to_signed_int(
+                            val.into_float_value(),
+                            ctx.ctx.i64_type(),
+                            "fptosi",
+                        )
+                        .into(),
+                )
+            })))),
+        })),
     ];
     let ast_list: Vec<Option<ast::Stmt<()>>> =
         (0..top_level_def_list.len()).map(|_| None).collect();
-    izip!(top_level_def_list, ast_list).collect_vec()
+    (
+        izip!(top_level_def_list, ast_list).collect_vec(),
+        &[
+            "int32",
+            "int64",
+            "float",
+            "round",
+            "round64",
+            "range",
+            "str",
+            "bool",
+            "floor",
+            "floor64",
+            "ceil",
+            "ceil64"
+        ]
+    )
 }
\ No newline at end of file
diff --git a/nac3core/src/toplevel/composer.rs b/nac3core/src/toplevel/composer.rs
index 4eabb983e..051af13f8 100644
--- a/nac3core/src/toplevel/composer.rs
+++ b/nac3core/src/toplevel/composer.rs
@@ -42,7 +42,7 @@ impl TopLevelComposer {
         builtins: Vec<(StrRef, FunSignature, Arc<GenCall>)>,
     ) -> (Self, HashMap<StrRef, DefinitionId>, HashMap<StrRef, Type>) {
         let mut primitives = Self::make_primitives();
-        let mut definition_ast_list = builtins::get_built_ins(&mut primitives);
+        let (mut definition_ast_list, builtin_name_list) = builtins::get_built_ins(&mut primitives);
         let primitives_ty = primitives.0;
         let mut unifier = primitives.1;
         let mut keyword_list: HashSet<StrRef> = HashSet::from_iter(vec![
@@ -68,9 +68,7 @@ impl TopLevelComposer {
         let mut built_in_id: HashMap<StrRef, DefinitionId> = Default::default();
         let mut built_in_ty: HashMap<StrRef, Type> = Default::default();
 
-        for (id, name) in
-            ["int32", "int64", "float", "round", "round64", "range", "str", "bool"].iter().rev().enumerate()
-        {
+        for (id, name) in builtin_name_list.iter().rev().enumerate() {
             let name = (**name).into();
             let id = definition_ast_list.len() - id - 1;
             let def = definition_ast_list[id].0.read();