diff --git a/compiler/builtins/src/std.rs b/compiler/builtins/src/std.rs
index a94a7dfa7d..440afbf8cc 100644
--- a/compiler/builtins/src/std.rs
+++ b/compiler/builtins/src/std.rs
@@ -323,6 +323,12 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
         SolvedType::Func(vec![float_type()], Box::new(float_type())),
     );
 
+    // round : Float -> Int
+    add_type(
+        Symbol::FLOAT_ROUND,
+        SolvedType::Func(vec![float_type()], Box::new(int_type())),
+    );
+
     // highest : Float
     add_type(Symbol::FLOAT_HIGHEST, float_type());
 
diff --git a/compiler/builtins/src/unique.rs b/compiler/builtins/src/unique.rs
index dbb1c849cc..193251a460 100644
--- a/compiler/builtins/src/unique.rs
+++ b/compiler/builtins/src/unique.rs
@@ -386,6 +386,12 @@ pub fn types() -> MutMap<Symbol, (SolvedType, Region)> {
         unique_function(vec![float_type(UVAR1)], float_type(UVAR2)),
     );
 
+    // round : Float -> Int
+    add_type(
+        Symbol::FLOAT_ROUND,
+        unique_function(vec![float_type(UVAR1)], int_type(UVAR2)),
+    );
+
     // highest : Float
     add_type(Symbol::FLOAT_HIGHEST, float_type(UVAR1));
 
diff --git a/compiler/gen/src/llvm/build.rs b/compiler/gen/src/llvm/build.rs
index 6a57b21537..278e25de70 100644
--- a/compiler/gen/src/llvm/build.rs
+++ b/compiler/gen/src/llvm/build.rs
@@ -5,7 +5,7 @@ use inkwell::context::Context;
 use inkwell::memory_buffer::MemoryBuffer;
 use inkwell::module::{Linkage, Module};
 use inkwell::passes::{PassManager, PassManagerBuilder};
-use inkwell::types::{BasicTypeEnum, IntType, StructType};
+use inkwell::types::{BasicTypeEnum, FunctionType, IntType, StructType};
 use inkwell::values::BasicValueEnum::{self, *};
 use inkwell::values::{FunctionValue, IntValue, PointerValue, StructValue};
 use inkwell::{FloatPredicate, IntPredicate, OptimizationLevel};
@@ -57,8 +57,48 @@ pub fn module_from_builtins<'ctx>(ctx: &'ctx Context, module_name: &str) -> Modu
     let memory_buffer =
         MemoryBuffer::create_from_memory_range(include_bytes!("builtins.bc"), module_name);
 
-    Module::parse_bitcode_from_buffer(&memory_buffer, ctx)
-        .unwrap_or_else(|err| panic!("Unable to import builtins bitcode. LLVM error: {:?}", err))
+    let module = Module::parse_bitcode_from_buffer(&memory_buffer, ctx)
+        .unwrap_or_else(|err| panic!("Unable to import builtins bitcode. LLVM error: {:?}", err));
+
+    // Add LLVM intrinsics.
+    add_intrinsics(ctx, &module);
+
+    module
+}
+
+fn add_intrinsics<'ctx>(ctx: &'ctx Context, module: &Module<'ctx>) {
+    // List of all supported LLVM intrinsics:
+    //
+    // https://releases.llvm.org/10.0.0/docs/LangRef.html#standard-c-library-intrinsics
+    let i64_type = ctx.i64_type();
+    let f64_type = ctx.f64_type();
+
+    add_intrinsic(
+        module,
+        LLVM_SQRT_F64,
+        f64_type.fn_type(&[f64_type.into()], false),
+    );
+
+    add_intrinsic(
+        module,
+        LLVM_LROUND_I64_F64,
+        i64_type.fn_type(&[f64_type.into()], false),
+    );
+}
+
+static LLVM_SQRT_F64: &str = "llvm.sqrt.f64";
+static LLVM_LROUND_I64_F64: &str = "llvm.lround.i64.f64";
+
+fn add_intrinsic<'ctx>(
+    module: &Module<'ctx>,
+    intrinsic_name: &'static str,
+    fn_type: FunctionType<'ctx>,
+) -> FunctionValue<'ctx> {
+    let fn_val = module.add_function(intrinsic_name, fn_type, None);
+
+    fn_val.set_call_conventions(C_CALL_CONV);
+
+    fn_val
 }
 
 pub fn add_passes(fpm: &PassManager<FunctionValue<'_>>, opt_level: OptLevel) {
@@ -1182,6 +1222,8 @@ fn call_with_args<'a, 'ctx, 'env>(
                 }
             }
         }
+        Symbol::FLOAT_SQRT => call_intrinsic(LLVM_SQRT_F64, env, args),
+        Symbol::FLOAT_ROUND => call_intrinsic(LLVM_LROUND_I64_F64, env, args),
         Symbol::LIST_SET => list_set(parent, args, env, InPlace::Clone),
         Symbol::LIST_SET_IN_PLACE => list_set(parent, args, env, InPlace::InPlace),
         _ => {
@@ -1209,6 +1251,36 @@ fn call_with_args<'a, 'ctx, 'env>(
     }
 }
 
+fn call_intrinsic<'a, 'ctx, 'env>(
+    intrinsic_name: &'static str,
+    env: &Env<'a, 'ctx, 'env>,
+    args: &[(BasicValueEnum<'ctx>, &'a Layout<'a>)],
+) -> BasicValueEnum<'ctx> {
+    let fn_val = env
+        .module
+        .get_function(intrinsic_name)
+        .unwrap_or_else(|| panic!("Unrecognized intrinsic function: {}", intrinsic_name));
+
+    let mut arg_vals: Vec<BasicValueEnum> = Vec::with_capacity_in(args.len(), env.arena);
+
+    for (arg, _layout) in args.iter() {
+        arg_vals.push(*arg);
+    }
+
+    let call = env
+        .builder
+        .build_call(fn_val, arg_vals.into_bump_slice(), "call");
+
+    call.set_call_convention(fn_val.get_call_conventions());
+
+    call.try_as_basic_value().left().unwrap_or_else(|| {
+        panic!(
+            "LLVM error: Invalid call by name for intrinsic {}",
+            intrinsic_name
+        )
+    })
+}
+
 fn load_list_len<'ctx>(
     builder: &Builder<'ctx>,
     wrapper_struct: StructValue<'ctx>,
diff --git a/compiler/gen/tests/gen_builtins.rs b/compiler/gen/tests/gen_builtins.rs
index bcf02841fc..8f6f62bc7b 100644
--- a/compiler/gen/tests/gen_builtins.rs
+++ b/compiler/gen/tests/gen_builtins.rs
@@ -27,6 +27,16 @@ mod gen_builtins {
     use roc_mono::layout::Layout;
     use roc_types::subs::Subs;
 
+    #[test]
+    fn f64_sqrt() {
+        assert_evals_to!("Float.sqrt 144", 12.0, f64);
+    }
+
+    #[test]
+    fn f64_round() {
+        assert_evals_to!("Float.round 3.6", 4, i64);
+    }
+
     #[test]
     fn empty_list_literal() {
         assert_evals_to!("[]", &[], &'static [i64]);