| // run-pass |
| // Tests saturating float->int casts. See u128-as-f32.rs for the opposite direction. |
| // compile-flags: -Z saturating-float-casts |
| |
| #![feature(test, stmt_expr_attributes)] |
| #![deny(overflowing_literals)] |
| extern crate test; |
| |
| use std::{f32, f64}; |
| use std::{u8, i8, u16, i16, u32, i32, u64, i64}; |
| #[cfg(not(target_os="emscripten"))] |
| use std::{u128, i128}; |
| use test::black_box; |
| |
| macro_rules! test { |
| ($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!($dest_ty)); |
| ); |
| |
| ($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, $ival:expr) => ( |
| test_c!($fval, f32 -> $ity, $ival); |
| test_c!($fval, f64 -> $ity, $ival); |
| ) |
| } |
| |
| macro_rules! common_fptoi_tests { |
| ($fty:ident -> $($ity:ident)+) => ({ $( |
| test!($fty::NAN, $fty -> $ity, 0); |
| test!($fty::INFINITY, $fty -> $ity, $ity::MAX); |
| test!($fty::NEG_INFINITY, $fty -> $ity, $ity::MIN); |
| // These two tests are not solely float->int tests, in particular the latter relies on |
| // `u128::MAX as f32` not being UB. But that's okay, since this file tests int->float |
| // as well, the test is just slightly misplaced. |
| test!($ity::MIN as $fty, $fty -> $ity, $ity::MIN); |
| test!($ity::MAX as $fty, $fty -> $ity, $ity::MAX); |
| test_c!(0., $fty -> $ity, 0); |
| test_c!($fty::MIN_POSITIVE, $fty -> $ity, 0); |
| test!(-0.9, $fty -> $ity, 0); |
| test_c!(1., $fty -> $ity, 1); |
| test_c!(42., $fty -> $ity, 42); |
| )+ }); |
| |
| (f* -> $($ity:ident)+) => ({ |
| common_fptoi_tests!(f32 -> $($ity)+); |
| common_fptoi_tests!(f64 -> $($ity)+); |
| }) |
| } |
| |
| macro_rules! fptoui_tests { |
| ($fty: ident -> $($ity: ident)+) => ({ $( |
| test!(-0., $fty -> $ity, 0); |
| test!(-$fty::MIN_POSITIVE, $fty -> $ity, 0); |
| test!(-0.99999994, $fty -> $ity, 0); |
| test!(-1., $fty -> $ity, 0); |
| test!(-100., $fty -> $ity, 0); |
| test!(#[allow(overflowing_literals)] -1e50, $fty -> $ity, 0); |
| test!(#[allow(overflowing_literals)] -1e130, $fty -> $ity, 0); |
| )+ }); |
| |
| (f* -> $($ity:ident)+) => ({ |
| fptoui_tests!(f32 -> $($ity)+); |
| fptoui_tests!(f64 -> $($ity)+); |
| }) |
| } |
| |
| pub fn main() { |
| common_fptoi_tests!(f* -> i8 i16 i32 i64 u8 u16 u32 u64); |
| fptoui_tests!(f* -> u8 u16 u32 u64); |
| // FIXME emscripten does not support i128 |
| #[cfg(not(target_os="emscripten"))] { |
| common_fptoi_tests!(f* -> i128 u128); |
| fptoui_tests!(f* -> u128); |
| } |
| |
| // The following tests cover edge cases for some integer types. |
| |
| // # u8 |
| test_c!(254., f* -> u8, 254); |
| test!(256., f* -> u8, 255); |
| |
| // # i8 |
| test_c!(-127., f* -> i8, -127); |
| test!(-129., f* -> i8, -128); |
| test_c!(126., f* -> i8, 126); |
| test!(128., f* -> i8, 127); |
| |
| // # i32 |
| // -2147483648. is i32::MIN (exactly) |
| 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_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_c!(-2147483520., f* -> i32, -2147483520); |
| |
| // # u32 |
| // round(MAX) and nextUp(round(MAX)) |
| test_c!(4294967040., f* -> u32, 4294967040); |
| test!(4294967296., f* -> u32, 4294967295); |
| |
| // # u128 |
| #[cfg(not(target_os="emscripten"))] |
| { |
| // float->int: |
| test_c!(f32::MAX, f32 -> u128, 0xffffff00000000000000000000000000); |
| // nextDown(f32::MAX) = 2^128 - 2 * 2^104 |
| const SECOND_LARGEST_F32: f32 = 340282326356119256160033759537265639424.; |
| test_c!(SECOND_LARGEST_F32, f32 -> u128, 0xfffffe00000000000000000000000000); |
| } |
| } |