diff options
Diffstat (limited to 'src/test/ui/numbers-arithmetic/saturating-float-casts.rs')
| -rw-r--r-- | src/test/ui/numbers-arithmetic/saturating-float-casts.rs | 445 |
1 files changed, 410 insertions, 35 deletions
diff --git a/src/test/ui/numbers-arithmetic/saturating-float-casts.rs b/src/test/ui/numbers-arithmetic/saturating-float-casts.rs index f13964fb386..e6d0c94a02f 100644 --- a/src/test/ui/numbers-arithmetic/saturating-float-casts.rs +++ b/src/test/ui/numbers-arithmetic/saturating-float-casts.rs @@ -1,15 +1,22 @@ // run-pass +// compile-flags:-Zmir-opt-level=0 // Tests saturating float->int casts. See u128-as-f32.rs for the opposite direction. -// compile-flags: -Z saturating-float-casts +// +// Some of these tests come from a similar file in miri, +// tests/run-pass/float.rs. Individual test cases are potentially duplicated +// with the previously existing tests, but since this runs so quickly anyway, +// we're not spending the time to figure out exactly which ones should be +// merged. #![feature(test, stmt_expr_attributes)] +#![feature(track_caller)] #![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}; +#[cfg(not(target_os = "emscripten"))] +use std::{i128, u128}; +use std::{i16, i32, i64, i8, u16, u32, u64, u8}; use test::black_box; macro_rules! test { @@ -17,31 +24,18 @@ macro_rules! test { // 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, $ival); + test!($fval, f32 -> $ity, $ival); + test!($fval, f64 -> $ity, $ival); ) } @@ -55,11 +49,11 @@ macro_rules! common_fptoi_tests { // as well, the test is just slightly misplaced. test!($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., $fty -> $ity, 0); + test!($fty::MIN_POSITIVE, $fty -> $ity, 0); test!(-0.9, $fty -> $ity, 0); - test_c!(1., $fty -> $ity, 1); - test_c!(42., $fty -> $ity, 42); + test!(1., $fty -> $ity, 1); + test!(42., $fty -> $ity, 42); )+ }); (f* -> $($ity:ident)+) => ({ @@ -85,11 +79,392 @@ macro_rules! fptoui_tests { }) } +use std::fmt::Debug; + +// Helper function to avoid promotion so that this tests "run-time" casts, not CTFE. +#[track_caller] +#[inline(never)] +fn assert_eq<T: PartialEq + Debug>(x: T, y: T) { + assert_eq!(x, y); +} + +trait FloatToInt<Int>: Copy { + fn cast(self) -> Int; + unsafe fn cast_unchecked(self) -> Int; +} + +impl FloatToInt<i8> for f32 { + fn cast(self) -> i8 { + self as _ + } + unsafe fn cast_unchecked(self) -> i8 { + self.to_int_unchecked() + } +} +impl FloatToInt<i32> for f32 { + fn cast(self) -> i32 { + self as _ + } + unsafe fn cast_unchecked(self) -> i32 { + self.to_int_unchecked() + } +} +impl FloatToInt<u32> for f32 { + fn cast(self) -> u32 { + self as _ + } + unsafe fn cast_unchecked(self) -> u32 { + self.to_int_unchecked() + } +} +impl FloatToInt<i64> for f32 { + fn cast(self) -> i64 { + self as _ + } + unsafe fn cast_unchecked(self) -> i64 { + self.to_int_unchecked() + } +} +impl FloatToInt<u64> for f32 { + fn cast(self) -> u64 { + self as _ + } + unsafe fn cast_unchecked(self) -> u64 { + self.to_int_unchecked() + } +} + +impl FloatToInt<i8> for f64 { + fn cast(self) -> i8 { + self as _ + } + unsafe fn cast_unchecked(self) -> i8 { + self.to_int_unchecked() + } +} +impl FloatToInt<i32> for f64 { + fn cast(self) -> i32 { + self as _ + } + unsafe fn cast_unchecked(self) -> i32 { + self.to_int_unchecked() + } +} +impl FloatToInt<u32> for f64 { + fn cast(self) -> u32 { + self as _ + } + unsafe fn cast_unchecked(self) -> u32 { + self.to_int_unchecked() + } +} +impl FloatToInt<i64> for f64 { + fn cast(self) -> i64 { + self as _ + } + unsafe fn cast_unchecked(self) -> i64 { + self.to_int_unchecked() + } +} +impl FloatToInt<u64> for f64 { + fn cast(self) -> u64 { + self as _ + } + unsafe fn cast_unchecked(self) -> u64 { + self.to_int_unchecked() + } +} +// FIXME emscripten does not support i128 +#[cfg(not(target_os = "emscripten"))] +impl FloatToInt<i128> for f64 { + fn cast(self) -> i128 { + self as _ + } + unsafe fn cast_unchecked(self) -> i128 { + self.to_int_unchecked() + } +} +// FIXME emscripten does not support i128 +#[cfg(not(target_os = "emscripten"))] +impl FloatToInt<u128> for f64 { + fn cast(self) -> u128 { + self as _ + } + unsafe fn cast_unchecked(self) -> u128 { + self.to_int_unchecked() + } +} + +/// Test this cast both via `as` and via `to_int_unchecked` (i.e., it must not saturate). +#[track_caller] +#[inline(never)] +fn test_both_cast<F, I>(x: F, y: I) +where + F: FloatToInt<I>, + I: PartialEq + Debug, +{ + assert_eq!(x.cast(), y); + assert_eq!(unsafe { x.cast_unchecked() }, y); +} + +fn casts() { + // f32 -> i8 + test_both_cast::<f32, i8>(127.99, 127); + test_both_cast::<f32, i8>(-128.99, -128); + + // f32 -> i32 + test_both_cast::<f32, i32>(0.0, 0); + test_both_cast::<f32, i32>(-0.0, 0); + test_both_cast::<f32, i32>(/*0x1p-149*/ f32::from_bits(0x00000001), 0); + test_both_cast::<f32, i32>(/*-0x1p-149*/ f32::from_bits(0x80000001), 0); + test_both_cast::<f32, i32>(/*0x1.19999ap+0*/ f32::from_bits(0x3f8ccccd), 1); + test_both_cast::<f32, i32>(/*-0x1.19999ap+0*/ f32::from_bits(0xbf8ccccd), -1); + test_both_cast::<f32, i32>(1.9, 1); + test_both_cast::<f32, i32>(-1.9, -1); + test_both_cast::<f32, i32>(5.0, 5); + test_both_cast::<f32, i32>(-5.0, -5); + test_both_cast::<f32, i32>(2147483520.0, 2147483520); + test_both_cast::<f32, i32>(-2147483648.0, -2147483648); + // unrepresentable casts + assert_eq::<i32>(2147483648.0f32 as i32, i32::MAX); + assert_eq::<i32>(-2147483904.0f32 as i32, i32::MIN); + assert_eq::<i32>(f32::MAX as i32, i32::MAX); + assert_eq::<i32>(f32::MIN as i32, i32::MIN); + assert_eq::<i32>(f32::INFINITY as i32, i32::MAX); + assert_eq::<i32>(f32::NEG_INFINITY as i32, i32::MIN); + assert_eq::<i32>(f32::NAN as i32, 0); + assert_eq::<i32>((-f32::NAN) as i32, 0); + + // f32 -> u32 + test_both_cast::<f32, u32>(0.0, 0); + test_both_cast::<f32, u32>(-0.0, 0); + test_both_cast::<f32, u32>(-0.9999999, 0); + test_both_cast::<f32, u32>(/*0x1p-149*/ f32::from_bits(0x1), 0); + test_both_cast::<f32, u32>(/*-0x1p-149*/ f32::from_bits(0x80000001), 0); + test_both_cast::<f32, u32>(/*0x1.19999ap+0*/ f32::from_bits(0x3f8ccccd), 1); + test_both_cast::<f32, u32>(1.9, 1); + test_both_cast::<f32, u32>(5.0, 5); + test_both_cast::<f32, u32>(2147483648.0, 0x8000_0000); + test_both_cast::<f32, u32>(4294967040.0, 0u32.wrapping_sub(256)); + test_both_cast::<f32, u32>(/*-0x1.ccccccp-1*/ f32::from_bits(0xbf666666), 0); + test_both_cast::<f32, u32>(/*-0x1.fffffep-1*/ f32::from_bits(0xbf7fffff), 0); + test_both_cast::<f32, u32>((u32::MAX - 128) as f32, u32::MAX - 255); // rounding loss + + // unrepresentable casts: + + // rounds up and then becomes unrepresentable + assert_eq::<u32>((u32::MAX - 127) as f32 as u32, u32::MAX); + + assert_eq::<u32>(4294967296.0f32 as u32, u32::MAX); + assert_eq::<u32>(-5.0f32 as u32, 0); + assert_eq::<u32>(f32::MAX as u32, u32::MAX); + assert_eq::<u32>(f32::MIN as u32, 0); + assert_eq::<u32>(f32::INFINITY as u32, u32::MAX); + assert_eq::<u32>(f32::NEG_INFINITY as u32, 0); + assert_eq::<u32>(f32::NAN as u32, 0); + assert_eq::<u32>((-f32::NAN) as u32, 0); + + // f32 -> i64 + test_both_cast::<f32, i64>(4294967296.0, 4294967296); + test_both_cast::<f32, i64>(-4294967296.0, -4294967296); + test_both_cast::<f32, i64>(9223371487098961920.0, 9223371487098961920); + test_both_cast::<f32, i64>(-9223372036854775808.0, -9223372036854775808); + + // f64 -> i8 + test_both_cast::<f64, i8>(127.99, 127); + test_both_cast::<f64, i8>(-128.99, -128); + + // f64 -> i32 + test_both_cast::<f64, i32>(0.0, 0); + test_both_cast::<f64, i32>(-0.0, 0); + test_both_cast::<f64, i32>(/*0x1.199999999999ap+0*/ f64::from_bits(0x3ff199999999999a), 1); + test_both_cast::<f64, i32>( + /*-0x1.199999999999ap+0*/ f64::from_bits(0xbff199999999999a), + -1, + ); + test_both_cast::<f64, i32>(1.9, 1); + test_both_cast::<f64, i32>(-1.9, -1); + test_both_cast::<f64, i32>(1e8, 100_000_000); + test_both_cast::<f64, i32>(2147483647.0, 2147483647); + test_both_cast::<f64, i32>(-2147483648.0, -2147483648); + // unrepresentable casts + assert_eq::<i32>(2147483648.0f64 as i32, i32::MAX); + assert_eq::<i32>(-2147483649.0f64 as i32, i32::MIN); + + // f64 -> i64 + test_both_cast::<f64, i64>(0.0, 0); + test_both_cast::<f64, i64>(-0.0, 0); + test_both_cast::<f64, i64>(/*0x0.0000000000001p-1022*/ f64::from_bits(0x1), 0); + test_both_cast::<f64, i64>( + /*-0x0.0000000000001p-1022*/ f64::from_bits(0x8000000000000001), + 0, + ); + test_both_cast::<f64, i64>(/*0x1.199999999999ap+0*/ f64::from_bits(0x3ff199999999999a), 1); + test_both_cast::<f64, i64>( + /*-0x1.199999999999ap+0*/ f64::from_bits(0xbff199999999999a), + -1, + ); + test_both_cast::<f64, i64>(5.0, 5); + test_both_cast::<f64, i64>(5.9, 5); + test_both_cast::<f64, i64>(-5.0, -5); + test_both_cast::<f64, i64>(-5.9, -5); + test_both_cast::<f64, i64>(4294967296.0, 4294967296); + test_both_cast::<f64, i64>(-4294967296.0, -4294967296); + test_both_cast::<f64, i64>(9223372036854774784.0, 9223372036854774784); + test_both_cast::<f64, i64>(-9223372036854775808.0, -9223372036854775808); + // unrepresentable casts + assert_eq::<i64>(9223372036854775808.0f64 as i64, i64::MAX); + assert_eq::<i64>(-9223372036854777856.0f64 as i64, i64::MIN); + assert_eq::<i64>(f64::MAX as i64, i64::MAX); + assert_eq::<i64>(f64::MIN as i64, i64::MIN); + assert_eq::<i64>(f64::INFINITY as i64, i64::MAX); + assert_eq::<i64>(f64::NEG_INFINITY as i64, i64::MIN); + assert_eq::<i64>(f64::NAN as i64, 0); + assert_eq::<i64>((-f64::NAN) as i64, 0); + + // f64 -> u64 + test_both_cast::<f64, u64>(0.0, 0); + test_both_cast::<f64, u64>(-0.0, 0); + test_both_cast::<f64, u64>(-0.99999999999, 0); + test_both_cast::<f64, u64>(5.0, 5); + test_both_cast::<f64, u64>(1e16, 10000000000000000); + test_both_cast::<f64, u64>((u64::MAX - 1024) as f64, u64::MAX - 2047); // rounding loss + test_both_cast::<f64, u64>(9223372036854775808.0, 9223372036854775808); + // unrepresentable casts + assert_eq::<u64>(-5.0f64 as u64, 0); + // rounds up and then becomes unrepresentable + assert_eq::<u64>((u64::MAX - 1023) as f64 as u64, u64::MAX); + assert_eq::<u64>(18446744073709551616.0f64 as u64, u64::MAX); + assert_eq::<u64>(f64::MAX as u64, u64::MAX); + assert_eq::<u64>(f64::MIN as u64, 0); + assert_eq::<u64>(f64::INFINITY as u64, u64::MAX); + assert_eq::<u64>(f64::NEG_INFINITY as u64, 0); + assert_eq::<u64>(f64::NAN as u64, 0); + assert_eq::<u64>((-f64::NAN) as u64, 0); + + // FIXME emscripten does not support i128 + #[cfg(not(target_os = "emscripten"))] + { + // f64 -> i128 + assert_eq::<i128>(f64::MAX as i128, i128::MAX); + assert_eq::<i128>(f64::MIN as i128, i128::MIN); + + // f64 -> u128 + assert_eq::<u128>(f64::MAX as u128, u128::MAX); + assert_eq::<u128>(f64::MIN as u128, 0); + } + + // int -> f32 + assert_eq::<f32>(127i8 as f32, 127.0); + assert_eq::<f32>(2147483647i32 as f32, 2147483648.0); + assert_eq::<f32>((-2147483648i32) as f32, -2147483648.0); + assert_eq::<f32>(1234567890i32 as f32, /*0x1.26580cp+30*/ f32::from_bits(0x4e932c06)); + assert_eq::<f32>(16777217i32 as f32, 16777216.0); + assert_eq::<f32>((-16777217i32) as f32, -16777216.0); + assert_eq::<f32>(16777219i32 as f32, 16777220.0); + assert_eq::<f32>((-16777219i32) as f32, -16777220.0); + assert_eq::<f32>( + 0x7fffff4000000001i64 as f32, + /*0x1.fffffep+62*/ f32::from_bits(0x5effffff), + ); + assert_eq::<f32>( + 0x8000004000000001u64 as i64 as f32, + /*-0x1.fffffep+62*/ f32::from_bits(0xdeffffff), + ); + assert_eq::<f32>( + 0x0020000020000001i64 as f32, + /*0x1.000002p+53*/ f32::from_bits(0x5a000001), + ); + assert_eq::<f32>( + 0xffdfffffdfffffffu64 as i64 as f32, + /*-0x1.000002p+53*/ f32::from_bits(0xda000001), + ); + // FIXME emscripten does not support i128 + #[cfg(not(target_os = "emscripten"))] + { + assert_eq::<f32>(i128::MIN as f32, -170141183460469231731687303715884105728.0f32); + assert_eq::<f32>(u128::MAX as f32, f32::INFINITY); // saturation + } + + // int -> f64 + assert_eq::<f64>(127i8 as f64, 127.0); + assert_eq::<f64>(i16::MIN as f64, -32768.0f64); + assert_eq::<f64>(2147483647i32 as f64, 2147483647.0); + assert_eq::<f64>(-2147483648i32 as f64, -2147483648.0); + assert_eq::<f64>(987654321i32 as f64, 987654321.0); + assert_eq::<f64>(9223372036854775807i64 as f64, 9223372036854775807.0); + assert_eq::<f64>(-9223372036854775808i64 as f64, -9223372036854775808.0); + assert_eq::<f64>(4669201609102990i64 as f64, 4669201609102990.0); // Feigenbaum (?) + assert_eq::<f64>(9007199254740993i64 as f64, 9007199254740992.0); + assert_eq::<f64>(-9007199254740993i64 as f64, -9007199254740992.0); + assert_eq::<f64>(9007199254740995i64 as f64, 9007199254740996.0); + assert_eq::<f64>(-9007199254740995i64 as f64, -9007199254740996.0); + // FIXME emscripten does not support i128 + #[cfg(not(target_os = "emscripten"))] + { + // even that fits... + assert_eq::<f64>(u128::MAX as f64, 340282366920938463463374607431768211455.0f64); + } + + // f32 -> f64 + assert_eq::<u64>((0.0f32 as f64).to_bits(), 0.0f64.to_bits()); + assert_eq::<u64>(((-0.0f32) as f64).to_bits(), (-0.0f64).to_bits()); + assert_eq::<f64>(5.0f32 as f64, 5.0f64); + assert_eq::<f64>( + /*0x1p-149*/ f32::from_bits(0x1) as f64, + /*0x1p-149*/ f64::from_bits(0x36a0000000000000), + ); + assert_eq::<f64>( + /*-0x1p-149*/ f32::from_bits(0x80000001) as f64, + /*-0x1p-149*/ f64::from_bits(0xb6a0000000000000), + ); + assert_eq::<f64>( + /*0x1.fffffep+127*/ f32::from_bits(0x7f7fffff) as f64, + /*0x1.fffffep+127*/ f64::from_bits(0x47efffffe0000000), + ); + assert_eq::<f64>( + /*-0x1.fffffep+127*/ (-f32::from_bits(0x7f7fffff)) as f64, + /*-0x1.fffffep+127*/ -f64::from_bits(0x47efffffe0000000), + ); + assert_eq::<f64>( + /*0x1p-119*/ f32::from_bits(0x4000000) as f64, + /*0x1p-119*/ f64::from_bits(0x3880000000000000), + ); + assert_eq::<f64>( + /*0x1.8f867ep+125*/ f32::from_bits(0x7e47c33f) as f64, + 6.6382536710104395e+37, + ); + assert_eq::<f64>(f32::INFINITY as f64, f64::INFINITY); + assert_eq::<f64>(f32::NEG_INFINITY as f64, f64::NEG_INFINITY); + + // f64 -> f32 + assert_eq::<u32>((0.0f64 as f32).to_bits(), 0.0f32.to_bits()); + assert_eq::<u32>(((-0.0f64) as f32).to_bits(), (-0.0f32).to_bits()); + assert_eq::<f32>(5.0f64 as f32, 5.0f32); + assert_eq::<f32>(/*0x0.0000000000001p-1022*/ f64::from_bits(0x1) as f32, 0.0); + assert_eq::<f32>(/*-0x0.0000000000001p-1022*/ (-f64::from_bits(0x1)) as f32, -0.0); + assert_eq::<f32>( + /*0x1.fffffe0000000p-127*/ f64::from_bits(0x380fffffe0000000) as f32, + /*0x1p-149*/ f32::from_bits(0x800000), + ); + assert_eq::<f32>( + /*0x1.4eae4f7024c7p+108*/ f64::from_bits(0x46b4eae4f7024c70) as f32, + /*0x1.4eae5p+108*/ f32::from_bits(0x75a75728), + ); + assert_eq::<f32>(f64::MAX as f32, f32::INFINITY); + assert_eq::<f32>(f64::MIN as f32, f32::NEG_INFINITY); + assert_eq::<f32>(f64::INFINITY as f32, f32::INFINITY); + assert_eq::<f32>(f64::NEG_INFINITY as f32, f32::NEG_INFINITY); +} + pub fn main() { + casts(); // from miri's tests + 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"))] { + #[cfg(not(target_os = "emscripten"))] + { common_fptoi_tests!(f* -> i128 u128); fptoui_tests!(f* -> u128); } @@ -97,39 +472,39 @@ pub fn main() { // The following tests cover edge cases for some integer types. // # u8 - test_c!(254., f* -> u8, 254); + test!(254., f* -> u8, 254); test!(256., f* -> u8, 255); // # i8 - test_c!(-127., f* -> i8, -127); + test!(-127., f* -> i8, -127); test!(-129., f* -> i8, -128); - test_c!(126., f* -> i8, 126); + test!(126., f* -> i8, 126); test!(128., f* -> i8, 127); // # i32 // -2147483648. is i32::MIN (exactly) - test_c!(-2147483648., f* -> i32, i32::MIN); + test!(-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); + test!(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); + test!(-2147483520., f* -> i32, -2147483520); // # u32 // round(MAX) and nextUp(round(MAX)) - test_c!(4294967040., f* -> u32, 4294967040); + test!(4294967040., f* -> u32, 4294967040); test!(4294967296., f* -> u32, 4294967295); // # u128 - #[cfg(not(target_os="emscripten"))] + #[cfg(not(target_os = "emscripten"))] { // float->int: - test_c!(f32::MAX, f32 -> u128, 0xffffff00000000000000000000000000); + test!(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); + test!(SECOND_LARGEST_F32, f32 -> u128, 0xfffffe00000000000000000000000000); } } |