-// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
($val:expr, $src_ty:ident -> $dest_ty:ident, $expected:expr) => (
// black_box disables constant evaluation to test run-time conversions:
assert_eq!(black_box::<$src_ty>($val) as $dest_ty, $expected,
- "run time {} -> {}", stringify!($src_ty), stringify!($dest_ty));
- // ... whereas this variant triggers constant evaluation:
+ "run-time {} -> {}", stringify!($src_ty), stringify!($dest_ty));
+ );
+
+ ($fval:expr, f* -> $ity:ident, $ival:expr) => (
+ test!($fval, f32 -> $ity, $ival);
+ test!($fval, f64 -> $ity, $ival);
+ )
+}
+
+// This macro tests const eval in addition to run-time evaluation.
+// If and when saturating casts are adopted, this macro should be merged with test!() to ensure
+// that run-time and const eval agree on inputs that currently trigger a const eval error.
+macro_rules! test_c {
+ ($val:expr, $src_ty:ident -> $dest_ty:ident, $expected:expr) => ({
+ test!($val, $src_ty -> $dest_ty, $expected);
{
const X: $src_ty = $val;
const Y: $dest_ty = X as $dest_ty;
assert_eq!(Y, $expected,
"const eval {} -> {}", stringify!($src_ty), stringify!($dest_ty));
}
- );
+ });
($fval:expr, f* -> $ity:ident, $ival:expr) => (
test!($fval, f32 -> $ity, $ival);
// as well, the test is just slightly misplaced.
test!($ity::MIN as $fty, $fty -> $ity, $ity::MIN);
test!($ity::MAX as $fty, $fty -> $ity, $ity::MAX);
- test!(0., $fty -> $ity, 0);
- test!($fty::MIN_POSITIVE, $fty -> $ity, 0);
+ test_c!(0., $fty -> $ity, 0);
+ test_c!($fty::MIN_POSITIVE, $fty -> $ity, 0);
test!(-0.9, $fty -> $ity, 0);
- test!(1., $fty -> $ity, 1);
- test!(42., $fty -> $ity, 42);
+ test_c!(1., $fty -> $ity, 1);
+ test_c!(42., $fty -> $ity, 42);
)+ });
(f* -> $($ity:ident)+) => ({
// The following tests cover edge cases for some integer types.
- // u8
- test!(254., f* -> u8, 254);
+ // # u8
+ test_c!(254., f* -> u8, 254);
test!(256., f* -> u8, 255);
- // i8
- test!(-127., f* -> i8, -127);
+ // # i8
+ test_c!(-127., f* -> i8, -127);
test!(-129., f* -> i8, -128);
- test!(126., f* -> i8, 126);
+ test_c!(126., f* -> i8, 126);
test!(128., f* -> i8, 127);
- // i32
+ // # i32
// -2147483648. is i32::MIN (exactly)
- test!(-2147483648., f* -> i32, i32::MIN);
+ test_c!(-2147483648., f* -> i32, i32::MIN);
// 2147483648. is i32::MAX rounded up
test!(2147483648., f32 -> i32, 2147483647);
// With 24 significand bits, floats with magnitude in [2^30 + 1, 2^31] are rounded to
// multiples of 2^7. Therefore, nextDown(round(i32::MAX)) is 2^31 - 128:
- test!(2147483520., f32 -> i32, 2147483520);
+ test_c!(2147483520., f32 -> i32, 2147483520);
// Similarly, nextUp(i32::MIN) is i32::MIN + 2^8 and nextDown(i32::MIN) is i32::MIN - 2^7
test!(-2147483904., f* -> i32, i32::MIN);
- test!(-2147483520., f* -> i32, -2147483520);
+ test_c!(-2147483520., f* -> i32, -2147483520);
- // u32 -- round(MAX) and nextUp(round(MAX))
- test!(4294967040., f* -> u32, 4294967040);
+ // # u32
+ // round(MAX) and nextUp(round(MAX))
+ test_c!(4294967040., f* -> u32, 4294967040);
test!(4294967296., f* -> u32, 4294967295);
- // u128
- // # float->int
- test!(f32::MAX, f32 -> u128, 0xffffff00000000000000000000000000);
+ // # u128
+ // float->int:
+ test_c!(f32::MAX, f32 -> u128, 0xffffff00000000000000000000000000);
// nextDown(f32::MAX) = 2^128 - 2 * 2^104
const SECOND_LARGEST_F32: f32 = 340282326356119256160033759537265639424.;
- test!(SECOND_LARGEST_F32, f32 -> u128, 0xfffffe00000000000000000000000000);
- // # int->float
+ test_c!(SECOND_LARGEST_F32, f32 -> u128, 0xfffffe00000000000000000000000000);
+
+ // int->float:
// f32::MAX - 0.5 ULP and smaller should be rounded down
- test!(0xfffffe00000000000000000000000000, u128 -> f32, SECOND_LARGEST_F32);
- test!(0xfffffe7fffffffffffffffffffffffff, u128 -> f32, SECOND_LARGEST_F32);
- test!(0xfffffe80000000000000000000000000, u128 -> f32, SECOND_LARGEST_F32);
+ test_c!(0xfffffe00000000000000000000000000, u128 -> f32, SECOND_LARGEST_F32);
+ test_c!(0xfffffe7fffffffffffffffffffffffff, u128 -> f32, SECOND_LARGEST_F32);
+ test_c!(0xfffffe80000000000000000000000000, u128 -> f32, SECOND_LARGEST_F32);
// numbers within < 0.5 ULP of f32::MAX it should be rounded to f32::MAX
- test!(0xfffffe80000000000000000000000001, u128 -> f32, f32::MAX);
- test!(0xfffffeffffffffffffffffffffffffff, u128 -> f32, f32::MAX);
- test!(0xffffff00000000000000000000000000, u128 -> f32, f32::MAX);
- test!(0xffffff00000000000000000000000001, u128 -> f32, f32::MAX);
- test!(0xffffff7fffffffffffffffffffffffff, u128 -> f32, f32::MAX);
+ test_c!(0xfffffe80000000000000000000000001, u128 -> f32, f32::MAX);
+ test_c!(0xfffffeffffffffffffffffffffffffff, u128 -> f32, f32::MAX);
+ test_c!(0xffffff00000000000000000000000000, u128 -> f32, f32::MAX);
+ test_c!(0xffffff00000000000000000000000001, u128 -> f32, f32::MAX);
+ test_c!(0xffffff7fffffffffffffffffffffffff, u128 -> f32, f32::MAX);
// f32::MAX + 0.5 ULP and greater should be rounded to infinity
- test!(0xffffff80000000000000000000000000, u128 -> f32, f32::INFINITY);
- test!(0xffffff80000000f00000000000000000, u128 -> f32, f32::INFINITY);
- test!(0xffffff87ffffffffffffffff00000001, u128 -> f32, f32::INFINITY);
-
- test!(!0, u128 -> f32, f32::INFINITY);
+ test_c!(0xffffff80000000000000000000000000, u128 -> f32, f32::INFINITY);
+ test_c!(0xffffff80000000f00000000000000000, u128 -> f32, f32::INFINITY);
+ test_c!(0xffffff87ffffffffffffffff00000001, u128 -> f32, f32::INFINITY);
// u128->f64 should not be affected by the u128->f32 checks
- test!(0xffffff80000000000000000000000000, u128 -> f64,
+ test_c!(0xffffff80000000000000000000000000, u128 -> f64,
340282356779733661637539395458142568448.0);
- test!(u128::MAX, u128 -> f64, 340282366920938463463374607431768211455.0);
+ test_c!(u128::MAX, u128 -> f64, 340282366920938463463374607431768211455.0);
}
projects / rust.git / blobdiff