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avoid promotion so this can be compared with rustc

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This commit is contained in:
Ralf Jung 2020-03-28 09:20:07 +01:00
parent 032d9aa7d5
commit b8a817fc03
1 changed files with 78 additions and 66 deletions
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144
tests/run-pass/floats.rs
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@ -1,9 +1,21 @@
#![feature(track_caller)]
use std::fmt::Debug;
// Helper function to avoid promotion so that this tests "run-time" casts, not CTFE.
// Doesn't make a big difference when running this in Miri, but when running this in
// rustc (with -Zmir-opt-level=0) for comparison it means we use LLVM casts.
#[track_caller]
#[inline(never)]
fn assert_eq<T: PartialEq + Debug>(x: T, y: T) {
assert_eq!(x, y);
}
fn main() {
// basic arithmetic
assert_eq!(6.0_f32*6.0_f32, 36.0_f32);
assert_eq!(6.0_f64*6.0_f64, 36.0_f64);
assert_eq!(-{5.0_f32}, -5.0_f32);
assert_eq!(-{5.0_f64}, -5.0_f64);
assert_eq(6.0_f32*6.0_f32, 36.0_f32);
assert_eq(6.0_f64*6.0_f64, 36.0_f64);
assert_eq(-{5.0_f32}, -5.0_f32);
assert_eq(-{5.0_f64}, -5.0_f64);
// infinities, NaN
assert!((5.0_f32/0.0).is_infinite());
assert!((5.0_f64/0.0).is_infinite());
@ -12,84 +24,84 @@ fn main() {
// byte-level transmute
let x: u64 = unsafe { std::mem::transmute(42.0_f64) };
let y: f64 = unsafe { std::mem::transmute(x) };
assert_eq!(y, 42.0_f64);
assert_eq(y, 42.0_f64);
let x: u32 = unsafe { std::mem::transmute(42.0_f32) };
let y: f32 = unsafe { std::mem::transmute(x) };
assert_eq!(y, 42.0_f32);
assert_eq(y, 42.0_f32);
// f32-to-int casts
assert_eq!(5.0f32 as u32, 5);
assert_eq!(-5.0f32 as u32, 0);
assert_eq!(5.0f32 as i32, 5);
assert_eq!(-5.0f32 as i32, -5);
assert_eq!(std::f32::MAX as i32, i32::MAX);
assert_eq!(std::f32::INFINITY as i32, i32::MAX);
assert_eq!(std::f32::MAX as u32, u32::MAX);
assert_eq!(std::f32::INFINITY as u32, u32::MAX);
assert_eq!(std::f32::MIN as i32, i32::MIN);
assert_eq!(std::f32::NEG_INFINITY as i32, i32::MIN);
assert_eq!(std::f32::MIN as u32, 0);
assert_eq!(std::f32::NEG_INFINITY as u32, 0);
assert_eq!(std::f32::NAN as i32, 0);
assert_eq!(std::f32::NAN as u32, 0);
assert_eq!(u128::MAX as f32, std::f32::INFINITY);
assert_eq!((u32::MAX-127) as f32 as u32, u32::MAX); // rounding loss
assert_eq!((u32::MAX-128) as f32 as u32, u32::MAX-255); // rounding loss
assert_eq(5.0f32 as u32, 5);
assert_eq(-5.0f32 as u32, 0);
assert_eq(5.0f32 as i32, 5);
assert_eq(-5.0f32 as i32, -5);
assert_eq(std::f32::MAX as i32, i32::MAX);
assert_eq(std::f32::INFINITY as i32, i32::MAX);
assert_eq(std::f32::MAX as u32, u32::MAX);
assert_eq(std::f32::INFINITY as u32, u32::MAX);
assert_eq(std::f32::MIN as i32, i32::MIN);
assert_eq(std::f32::NEG_INFINITY as i32, i32::MIN);
assert_eq(std::f32::MIN as u32, 0);
assert_eq(std::f32::NEG_INFINITY as u32, 0);
assert_eq(std::f32::NAN as i32, 0);
assert_eq(std::f32::NAN as u32, 0);
assert_eq(u128::MAX as f32, std::f32::INFINITY);
assert_eq((u32::MAX-127) as f32 as u32, u32::MAX); // rounding loss
assert_eq((u32::MAX-128) as f32 as u32, u32::MAX-255); // rounding loss
// f64-to-int casts
assert_eq!(5.0f64 as u64, 5);
assert_eq!(-5.0f64 as u64, 0);
assert_eq!(5.0f64 as i64, 5);
assert_eq!(-5.0f64 as i64, -5);
assert_eq!(std::f64::MAX as i64, i64::MAX);
assert_eq!(std::f64::INFINITY as i64, i64::MAX);
assert_eq!(std::f64::MAX as u64, u64::MAX);
assert_eq!(std::f64::INFINITY as u64, u64::MAX);
assert_eq!(std::f64::MIN as i64, i64::MIN);
assert_eq!(std::f64::NEG_INFINITY as i64, i64::MIN);
assert_eq!(std::f64::MIN as u64, 0);
assert_eq!(std::f64::NEG_INFINITY as u64, 0);
assert_eq!(std::f64::NAN as i64, 0);
assert_eq!(std::f64::NAN as u64, 0);
assert_eq!(u128::MAX as f64 as u128, u128::MAX);
assert_eq!((u64::MAX-1023) as f64 as u64, u64::MAX); // rounding loss
assert_eq!((u64::MAX-1024) as f64 as u64, u64::MAX-2047); // rounding loss
assert_eq(5.0f64 as u64, 5);
assert_eq(-5.0f64 as u64, 0);
assert_eq(5.0f64 as i64, 5);
assert_eq(-5.0f64 as i64, -5);
assert_eq(std::f64::MAX as i64, i64::MAX);
assert_eq(std::f64::INFINITY as i64, i64::MAX);
assert_eq(std::f64::MAX as u64, u64::MAX);
assert_eq(std::f64::INFINITY as u64, u64::MAX);
assert_eq(std::f64::MIN as i64, i64::MIN);
assert_eq(std::f64::NEG_INFINITY as i64, i64::MIN);
assert_eq(std::f64::MIN as u64, 0);
assert_eq(std::f64::NEG_INFINITY as u64, 0);
assert_eq(std::f64::NAN as i64, 0);
assert_eq(std::f64::NAN as u64, 0);
assert_eq(u128::MAX as f64 as u128, u128::MAX);
assert_eq((u64::MAX-1023) as f64 as u64, u64::MAX); // rounding loss
assert_eq((u64::MAX-1024) as f64 as u64, u64::MAX-2047); // rounding loss
// f32 <-> f64 casts
assert_eq!(5.0f64 as f32, 5.0f32);
assert_eq!(5.0f32 as f64, 5.0f64);
assert_eq!(std::f64::MAX as f32, std::f32::INFINITY);
assert_eq!(std::f64::MIN as f32, std::f32::NEG_INFINITY);
assert_eq!(std::f32::INFINITY as f64, std::f64::INFINITY);
assert_eq!(std::f32::NEG_INFINITY as f64, std::f64::NEG_INFINITY);
assert_eq(5.0f64 as f32, 5.0f32);
assert_eq(5.0f32 as f64, 5.0f64);
assert_eq(std::f64::MAX as f32, std::f32::INFINITY);
assert_eq(std::f64::MIN as f32, std::f32::NEG_INFINITY);
assert_eq(std::f32::INFINITY as f64, std::f64::INFINITY);
assert_eq(std::f32::NEG_INFINITY as f64, std::f64::NEG_INFINITY);
// f32 min/max
assert_eq!((1.0 as f32).max(-1.0), 1.0);
assert_eq!((1.0 as f32).min(-1.0), -1.0);
assert_eq!(std::f32::NAN.min(9.0), 9.0);
assert_eq!(std::f32::NAN.max(-9.0), -9.0);
assert_eq!((9.0 as f32).min(std::f32::NAN), 9.0);
assert_eq!((-9.0 as f32).max(std::f32::NAN), -9.0);
assert_eq((1.0 as f32).max(-1.0), 1.0);
assert_eq((1.0 as f32).min(-1.0), -1.0);
assert_eq(std::f32::NAN.min(9.0), 9.0);
assert_eq(std::f32::NAN.max(-9.0), -9.0);
assert_eq((9.0 as f32).min(std::f32::NAN), 9.0);
assert_eq((-9.0 as f32).max(std::f32::NAN), -9.0);
// f64 min/max
assert_eq!((1.0 as f64).max(-1.0), 1.0);
assert_eq!((1.0 as f64).min(-1.0), -1.0);
assert_eq!(std::f64::NAN.min(9.0), 9.0);
assert_eq!(std::f64::NAN.max(-9.0), -9.0);
assert_eq!((9.0 as f64).min(std::f64::NAN), 9.0);
assert_eq!((-9.0 as f64).max(std::f64::NAN), -9.0);
assert_eq((1.0 as f64).max(-1.0), 1.0);
assert_eq((1.0 as f64).min(-1.0), -1.0);
assert_eq(std::f64::NAN.min(9.0), 9.0);
assert_eq(std::f64::NAN.max(-9.0), -9.0);
assert_eq((9.0 as f64).min(std::f64::NAN), 9.0);
assert_eq((-9.0 as f64).max(std::f64::NAN), -9.0);
// f32 copysign
assert_eq!(3.5_f32.copysign(0.42), 3.5_f32);
assert_eq!(3.5_f32.copysign(-0.42), -3.5_f32);
assert_eq!((-3.5_f32).copysign(0.42), 3.5_f32);
assert_eq!((-3.5_f32).copysign(-0.42), -3.5_f32);
assert_eq(3.5_f32.copysign(0.42), 3.5_f32);
assert_eq(3.5_f32.copysign(-0.42), -3.5_f32);
assert_eq((-3.5_f32).copysign(0.42), 3.5_f32);
assert_eq((-3.5_f32).copysign(-0.42), -3.5_f32);
assert!(std::f32::NAN.copysign(1.0).is_nan());
// f64 copysign
assert_eq!(3.5_f64.copysign(0.42), 3.5_f64);
assert_eq!(3.5_f64.copysign(-0.42), -3.5_f64);
assert_eq!((-3.5_f64).copysign(0.42), 3.5_f64);
assert_eq!((-3.5_f64).copysign(-0.42), -3.5_f64);
assert_eq(3.5_f64.copysign(0.42), 3.5_f64);
assert_eq(3.5_f64.copysign(-0.42), -3.5_f64);
assert_eq((-3.5_f64).copysign(0.42), 3.5_f64);
assert_eq((-3.5_f64).copysign(-0.42), -3.5_f64);
assert!(std::f64::NAN.copysign(1.0).is_nan());
}