diff --git a/vlib/builtin/array.v b/vlib/builtin/array.v
index 476b306e13..67b2db4dc3 100644
--- a/vlib/builtin/array.v
+++ b/vlib/builtin/array.v
@@ -571,46 +571,6 @@ fn compare_ints_reverse(a &int, b &int) int {
 	return 0
 }
 
-fn compare_u64s(a &u64, b &u64) int {
-	if *a < *b {
-		return -1
-	}
-	if *a > *b {
-		return 1
-	}
-	return 0
-}
-
-fn compare_u64s_reverse(a &u64, b &u64) int {
-	if *a > *b {
-		return -1
-	}
-	if *a < *b {
-		return 1
-	}
-	return 0
-}
-
-fn compare_floats(a &f64, b &f64) int {
-	if *a < *b {
-		return -1
-	}
-	if *a > *b {
-		return 1
-	}
-	return 0
-}
-
-fn compare_floats_reverse(a &f64, b &f64) int {
-	if *a > *b {
-		return -1
-	}
-	if *a < *b {
-		return 1
-	}
-	return 0
-}
-
 // sort sorts an array of int in place in ascending order.
 pub fn (mut a []int) sort() {
 	a.sort_with_compare(compare_ints)
@@ -649,38 +609,6 @@ pub fn (mut a array) grow_len(amount int) {
 	a.len += amount
 }
 
-// array_eq<T> checks if two arrays contain all the same elements in the same order.
-// []int == []int (also for: i64, f32, f64, byte, string)
-/*
-fn array_eq<T>(a1, a2 []T) bool {
-	if a1.len != a2.len {
-		return false
-	}
-	for i in 0..a1.len {
-		if a1[i] != a2[i] {
-			return false
-		}
-	}
-	return true
-}
-
-pub fn (a []int) eq(a2 []int) bool {
-	return array_eq(a, a2)
-}
-
-pub fn (a []i64) eq(a2 []i64) bool {
-	return array_eq(a, a2)
-}
-
-
-pub fn (a []byte) eq(a2 []byte) bool {
-	return array_eq(a, a2)
-}
-
-pub fn (a []f32) eq(a2 []f32) bool {
-	return array_eq(a, a2)
-}
-*/
 // eq checks if the arrays have the same elements or not.
 // TODO: make it work with all types.
 pub fn (a1 []string) eq(a2 []string) bool {
@@ -700,48 +628,6 @@ pub fn (a1 []string) eq(a2 []string) bool {
 	return true
 }
 
-// compare_i64 for []i64 sort_with_compare()
-// sort []i64 with quicksort
-// usage :
-// mut x := [i64(100),10,70,28,92]
-// x.sort_with_compare(compare_i64)
-// println(x)     // Sorted i64 Array
-// output:
-// [10, 28, 70, 92, 100]
-pub fn compare_i64(a &i64, b &i64) int {
-	if *a < *b {
-		return -1
-	}
-	if *a > *b {
-		return 1
-	}
-	return 0
-}
-
-// compare_f64 for []f64 sort_with_compare()
-// ref. compare_i64(...)
-pub fn compare_f64(a &f64, b &f64) int {
-	if *a < *b {
-		return -1
-	}
-	if *a > *b {
-		return 1
-	}
-	return 0
-}
-
-// compare_f32 for []f32 sort_with_compare()
-// ref. compare_i64(...)
-pub fn compare_f32(a &f32, b &f32) int {
-	if *a < *b {
-		return -1
-	}
-	if *a > *b {
-		return 1
-	}
-	return 0
-}
-
 // pointers returns a new array, where each element
 // is the address of the corresponding element in the array.
 [unsafe]
diff --git a/vlib/builtin/array_test.v b/vlib/builtin/array_test.v
index 238c6b10f6..54646b007a 100644
--- a/vlib/builtin/array_test.v
+++ b/vlib/builtin/array_test.v
@@ -836,7 +836,7 @@ fn test_sort_by_different_order_of_a_b() {
 
 fn test_f32_sort() {
 	mut f := [f32(50.0), 15, 1, 79, 38, 0, 27]
-	f.sort_with_compare(compare_f32)
+	f.sort()
 	assert f[0] == 0.0
 	assert f[1] == 1.0
 	assert f[6] == 79.0
@@ -844,7 +844,7 @@ fn test_f32_sort() {
 
 fn test_f64_sort() {
 	mut f := [50.0, 15, 1, 79, 38, 0, 27]
-	f.sort_with_compare(compare_f64)
+	f.sort()
 	assert f[0] == 0.0
 	assert f[1] == 1.0
 	assert f[6] == 79.0
@@ -852,7 +852,7 @@ fn test_f64_sort() {
 
 fn test_i64_sort() {
 	mut f := [i64(50), 15, 1, 79, 38, 0, 27]
-	f.sort_with_compare(compare_i64)
+	f.sort()
 	assert f[0] == 0
 	assert f[1] == 1
 	assert f[6] == 79
diff --git a/vlib/v/gen/c/array.v b/vlib/v/gen/c/array.v
index 98da61b0cc..082b1713fd 100644
--- a/vlib/v/gen/c/array.v
+++ b/vlib/v/gen/c/array.v
@@ -228,9 +228,7 @@ fn (mut g Gen) gen_array_sort(node ast.CallExpr) {
 		// users.sort() or users.sort(a > b)
 		compare_fn = match typ {
 			ast.int_type, ast.int_type.to_ptr() { 'compare_ints' }
-			ast.u64_type, ast.u64_type.to_ptr() { 'compare_u64s' }
 			ast.string_type, ast.string_type.to_ptr() { 'compare_strings' }
-			ast.f64_type, ast.f64_type.to_ptr() { 'compare_floats' }
 			else { '' }
 		}
 		if compare_fn != '' && is_reverse {