diff options
Diffstat (limited to 'src/test/ui/consts/const-float-bits-reject-conv.rs')
-rw-r--r-- | src/test/ui/consts/const-float-bits-reject-conv.rs | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/src/test/ui/consts/const-float-bits-reject-conv.rs b/src/test/ui/consts/const-float-bits-reject-conv.rs deleted file mode 100644 index c77e99abb..000000000 --- a/src/test/ui/consts/const-float-bits-reject-conv.rs +++ /dev/null @@ -1,68 +0,0 @@ -// compile-flags: -Zmir-opt-level=0 -// error-pattern: cannot use f32::to_bits on a NaN -#![feature(const_float_bits_conv)] -#![feature(const_float_classify)] - -// Don't promote -const fn nop<T>(x: T) -> T { x } - -macro_rules! const_assert { - ($a:expr) => { - { - const _: () = assert!($a); - assert!(nop($a)); - } - }; - ($a:expr, $b:expr) => { - { - const _: () = assert!($a == $b); - assert_eq!(nop($a), nop($b)); - } - }; -} - -fn f32() { - // Check that NaNs roundtrip their bits regardless of signalingness - // 0xA is 0b1010; 0x5 is 0b0101 -- so these two together clobbers all the mantissa bits - // ...actually, let's just check that these break. :D - const MASKED_NAN1: u32 = f32::NAN.to_bits() ^ 0x002A_AAAA; - //~^ inside - const MASKED_NAN2: u32 = f32::NAN.to_bits() ^ 0x0055_5555; - //~^ inside - - // The rest of the code is dead because the constants already fail to evaluate. - - const_assert!(f32::from_bits(MASKED_NAN1).is_nan()); - const_assert!(f32::from_bits(MASKED_NAN1).is_nan()); - - // LLVM does not guarantee that loads and stores of NaNs preserve their exact bit pattern. - // In practice, this seems to only cause a problem on x86, since the most widely used calling - // convention mandates that floating point values are returned on the x87 FPU stack. See #73328. - // However, during CTFE we still preserve bit patterns (though that is not a guarantee). - const_assert!(f32::from_bits(MASKED_NAN1).to_bits(), MASKED_NAN1); - const_assert!(f32::from_bits(MASKED_NAN2).to_bits(), MASKED_NAN2); -} - -fn f64() { - // Check that NaNs roundtrip their bits regardless of signalingness - // 0xA is 0b1010; 0x5 is 0b0101 -- so these two together clobbers all the mantissa bits - // ...actually, let's just check that these break. :D - const MASKED_NAN1: u64 = f64::NAN.to_bits() ^ 0x000A_AAAA_AAAA_AAAA; - //~^ inside - const MASKED_NAN2: u64 = f64::NAN.to_bits() ^ 0x0005_5555_5555_5555; - //~^ inside - - // The rest of the code is dead because the constants already fail to evaluate. - - const_assert!(f64::from_bits(MASKED_NAN1).is_nan()); - const_assert!(f64::from_bits(MASKED_NAN1).is_nan()); - - // See comment above. - const_assert!(f64::from_bits(MASKED_NAN1).to_bits(), MASKED_NAN1); - const_assert!(f64::from_bits(MASKED_NAN2).to_bits(), MASKED_NAN2); -} - -fn main() { - f32(); - f64(); -} |