unchecked_{shl,shr}: extend const tests.

Author: Centril

src/test/ui/consts/const-int-unchecked.rs

@@ -2,10 +2,119 @@
 
 use std::intrinsics;
 
-const SHR: u8 = unsafe { intrinsics::unchecked_shr(5_u8, 8) };
+// The documentation of `unchecked_shl` states that it:
+//
+// Performs an unchecked left shift, resulting in undefined behavior when
+// y < 0 or y >= N, where N is the width of T in bits.
+//
+// So we check this for a few `y`.
+
+// unsigned types:
+
+const SHL_U8: u8 = unsafe { intrinsics::unchecked_shl(5_u8, 8) };
+//~^ ERROR any use of this value will cause an error
+const SHL_U16: u16 = unsafe { intrinsics::unchecked_shl(5_u16, 16) };
+//~^ ERROR any use of this value will cause an error
+const SHL_U32: u32 = unsafe { intrinsics::unchecked_shl(5_u32, 32) };
+//~^ ERROR any use of this value will cause an error
+const SHL_U64: u64 = unsafe { intrinsics::unchecked_shl(5_u64, 64) };
+//~^ ERROR any use of this value will cause an error
+const SHL_U128: u128 = unsafe { intrinsics::unchecked_shl(5_u128, 128) };
+//~^ ERROR any use of this value will cause an error
+
+// signed types:
+
+const SHL_I8: i8 = unsafe { intrinsics::unchecked_shl(5_i8, 8) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I16: i16 = unsafe { intrinsics::unchecked_shl(5_16, 16) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I32: i32 = unsafe { intrinsics::unchecked_shl(5_i32, 32) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I64: i64 = unsafe { intrinsics::unchecked_shl(5_i64, 64) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I128: i128 = unsafe { intrinsics::unchecked_shl(5_i128, 128) };
+//~^ ERROR any use of this value will cause an error
+
+// and make sure we capture y < 0:
+
+const SHL_I8_NEG: i8 = unsafe { intrinsics::unchecked_shl(5_i8, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I16_NEG: i16 = unsafe { intrinsics::unchecked_shl(5_16, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I32_NEG: i32 = unsafe { intrinsics::unchecked_shl(5_i32, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I64_NEG: i64 = unsafe { intrinsics::unchecked_shl(5_i64, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I128_NEG: i128 = unsafe { intrinsics::unchecked_shl(5_i128, -1) };
+//~^ ERROR any use of this value will cause an error
+
+// and that there's no special relation to the value -1 by picking some
+// negative values at random:
+
+const SHL_I8_NEG_RANDOM: i8 = unsafe { intrinsics::unchecked_shl(5_i8, -6) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I16_NEG_RANDOM: i16 = unsafe { intrinsics::unchecked_shl(5_16, -13) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I32_NEG_RANDOM: i32 = unsafe { intrinsics::unchecked_shl(5_i32, -25) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I64_NEG_RANDOM: i64 = unsafe { intrinsics::unchecked_shl(5_i64, -30) };
+//~^ ERROR any use of this value will cause an error
+const SHL_I128_NEG_RANDOM: i128 = unsafe { intrinsics::unchecked_shl(5_i128, -93) };
+//~^ ERROR any use of this value will cause an error
+
+// Repeat it all over for `unchecked_shr`
+
+// unsigned types:
+
+const SHR_U8: u8 = unsafe { intrinsics::unchecked_shr(5_u8, 8) };
+//~^ ERROR any use of this value will cause an error
+const SHR_U16: u16 = unsafe { intrinsics::unchecked_shr(5_u16, 16) };
+//~^ ERROR any use of this value will cause an error
+const SHR_U32: u32 = unsafe { intrinsics::unchecked_shr(5_u32, 32) };
+//~^ ERROR any use of this value will cause an error
+const SHR_U64: u64 = unsafe { intrinsics::unchecked_shr(5_u64, 64) };
+//~^ ERROR any use of this value will cause an error
+const SHR_U128: u128 = unsafe { intrinsics::unchecked_shr(5_u128, 128) };
+//~^ ERROR any use of this value will cause an error
+
+// signed types:
+
+const SHR_I8: i8 = unsafe { intrinsics::unchecked_shr(5_i8, 8) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I16: i16 = unsafe { intrinsics::unchecked_shr(5_16, 16) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I32: i32 = unsafe { intrinsics::unchecked_shr(5_i32, 32) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I64: i64 = unsafe { intrinsics::unchecked_shr(5_i64, 64) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I128: i128 = unsafe { intrinsics::unchecked_shr(5_i128, 128) };
+//~^ ERROR any use of this value will cause an error
+
+// and make sure we capture y < 0:
+
+const SHR_I8_NEG: i8 = unsafe { intrinsics::unchecked_shr(5_i8, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I16_NEG: i16 = unsafe { intrinsics::unchecked_shr(5_16, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I32_NEG: i32 = unsafe { intrinsics::unchecked_shr(5_i32, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I64_NEG: i64 = unsafe { intrinsics::unchecked_shr(5_i64, -1) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I128_NEG: i128 = unsafe { intrinsics::unchecked_shr(5_i128, -1) };
+//~^ ERROR any use of this value will cause an error
+
+// and that there's no special relation to the value -1 by picking some
+// negative values at random:
+
+const SHR_I8_NEG_RANDOM: i8 = unsafe { intrinsics::unchecked_shr(5_i8, -6) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I16_NEG_RANDOM: i16 = unsafe { intrinsics::unchecked_shr(5_16, -13) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I32_NEG_RANDOM: i32 = unsafe { intrinsics::unchecked_shr(5_i32, -25) };
+//~^ ERROR any use of this value will cause an error
+const SHR_I64_NEG_RANDOM: i64 = unsafe { intrinsics::unchecked_shr(5_i64, -30) };
 //~^ ERROR any use of this value will cause an error
-const SHL: u8 = unsafe { intrinsics::unchecked_shl(5_u8, 8) };
+const SHR_I128_NEG_RANDOM: i128 = unsafe { intrinsics::unchecked_shr(5_i128, -93) };
 //~^ ERROR any use of this value will cause an error
 
-fn main() {
-}
+fn main() {}