add ctlz and cttz tests

Author: dvermd

tests/run/int_intrinsics.rs

@@ -0,0 +1,71 @@
+// Compiler:
+//
+// Run-time:
+
+#![feature(no_core, intrinsics)]
+#![no_std]
+#![no_core]
+#![no_main]
+
+extern crate mini_core;
+use intrinsics::black_box;
+use mini_core::*;
+
+#[rustc_intrinsic]
+pub const fn ctlz<T: Copy>(_x: T) -> u32;
+
+#[rustc_intrinsic]
+pub const fn cttz<T: Copy>(_x: T) -> u32;
+
+#[no_mangle]
+extern "C" fn main(argc: i32, _argv: *const *const u8) -> i32 {
+    macro_rules! check {
+        ($func_name:ident, $input:expr, $expected:expr, $res:expr) => {{
+            if $func_name(black_box($input)) != $expected {
+                return $res;
+            }
+        }};
+    }
+
+    check!(ctlz, 0_u128, 128_u32, 1);
+    check!(ctlz, 1_u128, 127_u32, 2);
+    check!(ctlz, 0x8000_0000_0000_0000_0000_0000_0000_0000_u128, 0_u32, 3);
+    check!(cttz, 0_u128, 128_u32, 4);
+    check!(cttz, 1_u128, 0_u32, 5);
+    check!(cttz, 2_u128, 1_u32, 6);
+    check!(cttz, 0x8000_0000_0000_0000_0000_0000_0000_0000_u128, 127_u32, 7);
+
+    check!(ctlz, 0_u64, 64_u32, 8);
+    check!(ctlz, 1_u64, 63_u32, 9);
+    check!(ctlz, 0x8000_0000_0000_0000_u64, 0_u32, 10);
+    check!(cttz, 0_u64, 64_u32, 11);
+    check!(cttz, 1_u64, 0_u32, 12);
+    check!(cttz, 2_u64, 1_u32, 13);
+    check!(cttz, 0x8000_0000_0000_0000_u64, 63_u32, 14);
+    
+    check!(ctlz, 0_u32, 32_u32, 15);
+    check!(ctlz, 1_u32, 31_u32, 16);
+    check!(ctlz, 0x8000_0000_u32, 0_u32, 17);
+    check!(cttz, 0_u32, 32_u32, 18);
+    check!(cttz, 1_u32, 0_u32, 19);
+    check!(cttz, 2_u32, 1_u32, 20);
+    check!(cttz, 0x8000_0000_u32, 31_u32, 21);
+    
+    check!(ctlz, 0_u16, 16_u32, 22);
+    check!(ctlz, 1_u16, 15_u32, 23);
+    check!(ctlz, 0x8000_u16, 0_u32, 24);
+    check!(cttz, 0_u16, 16_u32, 25);
+    check!(cttz, 1_u16, 0_u32, 26);
+    check!(cttz, 2_u16, 1_u32, 27);
+    check!(cttz, 0x8000_u16, 15_u32, 28);
+    
+    check!(ctlz, 0_u8, 8_u32, 29);
+    check!(ctlz, 1_u8, 7_u32, 30);
+    check!(ctlz, 0x80_u8, 0_u32, 31);
+    check!(cttz, 0_u8, 8_u32, 32);
+    check!(cttz, 1_u8, 0_u32, 33);
+    check!(cttz, 2_u8, 1_u32, 34);
+    check!(cttz, 0x80_u8, 7_u32, 35);
+    
+    0
+}