Add tests

Co-Authored-By: folkertdev <folkert@folkertdev.nl>

Author: sayantn

library/coretests/tests/lib.rs

@@ -50,6 +50,7 @@
 #![feature(fmt_internals)]
 #![feature(formatting_options)]
 #![feature(freeze)]
+#![feature(funnel_shifts)]
 #![feature(future_join)]
 #![feature(generic_assert_internals)]
 #![feature(hasher_prefixfree_extras)]

library/coretests/tests/num/uint_macros.rs

@@ -104,6 +104,19 @@ macro_rules! uint_module {
                 assert_eq_const_safe!($T: C.rotate_left(128), C);
             }
 
+            fn test_funnel_shift() {
+                // Shifting by 0 should have no effect
+                assert_eq_const_safe!($T: <$T>::funnel_shl(A, B, 0), A);
+                assert_eq_const_safe!($T: <$T>::funnel_shr(A, B, 0), B);
+
+                assert_eq_const_safe!($T: <$T>::funnel_shl(_0, _1, 4), 0b1111);
+                assert_eq_const_safe!($T: <$T>::funnel_shr(_0, _1, 4), _1 >> 4);
+                assert_eq_const_safe!($T: <$T>::funnel_shl(_1, _0, 4), _1 << 4);
+
+                assert_eq_const_safe!($T: <$T>::funnel_shl(_1, _1, 4), <$T>::rotate_left(_1, 4));
+                assert_eq_const_safe!($T: <$T>::funnel_shr(_1, _1, 4), <$T>::rotate_right(_1, 4));
+            }
+
             fn test_swap_bytes() {
                 assert_eq_const_safe!($T: A.swap_bytes().swap_bytes(), A);
                 assert_eq_const_safe!($T: B.swap_bytes().swap_bytes(), B);
@@ -150,6 +163,12 @@ macro_rules! uint_module {
             }
         }
 
+        #[test]
+        #[should_panic = "attempt to funnel shift left with overflow"]
+        fn test_funnel_shift_overflow() {
+            let _ = <$T>::funnel_shl(A, B, 150);
+        }
+
         #[test]
         fn test_isolate_highest_one() {
             const BITS: $T = <$T>::MAX;

src/tools/miri/tests/fail/intrinsics/funnel_shl.rs

@@ -0,0 +1,9 @@
+#![feature(core_intrinsics, funnel_shifts)]
+
+fn main() {
+    unsafe {
+        std::intrinsics::unchecked_funnel_shl(1_u32, 2, 5);
+        std::intrinsics::unchecked_funnel_shl(1_u32, 2, 31);
+        std::intrinsics::unchecked_funnel_shl(1_u32, 2, 32); //~ ERROR: Undefined Behavior
+    }
+}

src/tools/miri/tests/fail/intrinsics/funnel_shl.stderr

@@ -0,0 +1,15 @@
+error: Undefined Behavior: `assume` called with `false`
+  --> tests/fail/intrinsics/funnel_shl.rs:LL:CC
+   |
+LL |         std::intrinsics::unchecked_funnel_shl(1_u32, 2, 32);
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `main` at tests/fail/intrinsics/funnel_shl.rs:LL:CC
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+

src/tools/miri/tests/fail/intrinsics/funnel_shr.rs

@@ -0,0 +1,9 @@
+#![feature(core_intrinsics, funnel_shifts)]
+
+fn main() {
+    unsafe {
+        std::intrinsics::unchecked_funnel_shr(1_u32, 2, 5);
+        std::intrinsics::unchecked_funnel_shr(1_u32, 2, 31);
+        std::intrinsics::unchecked_funnel_shr(1_u32, 2, 32); //~ ERROR: Undefined Behavior
+    }
+}

src/tools/miri/tests/fail/intrinsics/funnel_shr.stderr

@@ -0,0 +1,15 @@
+error: Undefined Behavior: `assume` called with `false`
+  --> tests/fail/intrinsics/funnel_shr.rs:LL:CC
+   |
+LL |         std::intrinsics::unchecked_funnel_shr(1_u32, 2, 32);
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Undefined Behavior occurred here
+   |
+   = help: this indicates a bug in the program: it performed an invalid operation, and caused Undefined Behavior
+   = help: see https://doc.rust-lang.org/nightly/reference/behavior-considered-undefined.html for further information
+   = note: BACKTRACE:
+   = note: inside `main` at tests/fail/intrinsics/funnel_shr.rs:LL:CC
+
+note: some details are omitted, run with `MIRIFLAGS=-Zmiri-backtrace=full` for a verbose backtrace
+
+error: aborting due to 1 previous error
+