Use std checked_div

Author: bjorn3

example/std_example.rs

@@ -34,8 +34,8 @@ fn main() {
     assert_eq!(0b0000000000000000000000000010000010000000000000000000000000000000_0000000000100000000000000000000000001000000000000100000000000000u128.leading_zeros(), 26);
     assert_eq!(0b0000000000000000000000000010000000000000000000000000000000000000_0000000000000000000000000000000000001000000000000000000010000000u128.trailing_zeros(), 7);
 
-    checked_div_i128(0i128, 2i128);
-    checked_div_u128(0u128, 2u128);
+    0i128.checked_div(2i128);
+    0u128.checked_div(2u128);
     assert_eq!(1u128 + 2, 3);
 
     assert_eq!(0b100010000000000000000000000000000u128 >> 10, 0b10001000000000000000000u128);
@@ -61,18 +61,3 @@ fn map(a: Option<(u8, Box<Instruction>)>) -> Option<Box<Instruction>> {
         Some((_, instr)) => Some(instr),
     }
 }
-
-fn checked_div_i128(lhs: i128, rhs: i128) -> Option<i128> {
-    if rhs == 0 || (lhs == -170141183460469231731687303715884105728 && rhs == -1) {
-        None
-    } else {
-        Some(unsafe { intrinsics::unchecked_div(lhs, rhs) })
-    }
-}
-
-fn checked_div_u128(lhs: u128, rhs: u128) -> Option<u128> {
-    match rhs {
-        0 => None,
-        rhs => Some(unsafe { intrinsics::unchecked_div(lhs, rhs) })
-    }
-}