3 // Tests saturating float->int casts. See u128-as-f32.rs for the opposite direction.
5 // Some of these tests come from a similar file in miri,
6 // tests/run-pass/float.rs. Individual test cases are potentially duplicated
7 // with the previously existing tests, but since this runs so quickly anyway,
8 // we're not spending the time to figure out exactly which ones should be
13 use self::test::black_box;
15 #[cfg(not(target_os = "emscripten"))]
16 use std::{i128, u128};
17 use std::{i16, i32, i64, i8, u16, u32, u64, u8};
20 ($val:expr, $src_ty:ident -> $dest_ty:ident, $expected:expr) => (
21 // black_box disables constant evaluation to test run-time conversions:
22 assert_eq!(black_box::<$src_ty>($val) as $dest_ty, $expected,
23 "run-time {} -> {}", stringify!($src_ty), stringify!($dest_ty));
26 const X: $src_ty = $val;
27 const Y: $dest_ty = X as $dest_ty;
28 assert_eq!(Y, $expected,
29 "const eval {} -> {}", stringify!($src_ty), stringify!($dest_ty));
33 ($fval:expr, f* -> $ity:ident, $ival:expr) => (
34 test!($fval, f32 -> $ity, $ival);
35 test!($fval, f64 -> $ity, $ival);
39 macro_rules! common_fptoi_tests {
40 ($fty:ident -> $($ity:ident)+) => ({ $(
41 test!($fty::NAN, $fty -> $ity, 0);
42 test!($fty::INFINITY, $fty -> $ity, $ity::MAX);
43 test!($fty::NEG_INFINITY, $fty -> $ity, $ity::MIN);
44 // These two tests are not solely float->int tests, in particular the latter relies on
45 // `u128::MAX as f32` not being UB. But that's okay, since this file tests int->float
46 // as well, the test is just slightly misplaced.
47 test!($ity::MIN as $fty, $fty -> $ity, $ity::MIN);
48 test!($ity::MAX as $fty, $fty -> $ity, $ity::MAX);
49 test!(0., $fty -> $ity, 0);
50 test!($fty::MIN_POSITIVE, $fty -> $ity, 0);
51 test!(-0.9, $fty -> $ity, 0);
52 test!(1., $fty -> $ity, 1);
53 test!(42., $fty -> $ity, 42);
56 (f* -> $($ity:ident)+) => ({
57 common_fptoi_tests!(f32 -> $($ity)+);
58 common_fptoi_tests!(f64 -> $($ity)+);
62 macro_rules! fptoui_tests {
63 ($fty: ident -> $($ity: ident)+) => ({ $(
64 test!(-0., $fty -> $ity, 0);
65 test!(-$fty::MIN_POSITIVE, $fty -> $ity, 0);
66 test!(-0.99999994, $fty -> $ity, 0);
67 test!(-1., $fty -> $ity, 0);
68 test!(-100., $fty -> $ity, 0);
69 test!(#[allow(overflowing_literals)] -1e50, $fty -> $ity, 0);
70 test!(#[allow(overflowing_literals)] -1e130, $fty -> $ity, 0);
73 (f* -> $($ity:ident)+) => ({
74 fptoui_tests!(f32 -> $($ity)+);
75 fptoui_tests!(f64 -> $($ity)+);
81 // Helper function to avoid promotion so that this tests "run-time" casts, not CTFE.
84 fn assert_eq<T: PartialEq + Debug>(x: T, y: T) {
88 trait FloatToInt<Int>: Copy {
90 unsafe fn cast_unchecked(self) -> Int;
93 impl FloatToInt<i8> for f32 {
97 unsafe fn cast_unchecked(self) -> i8 {
98 self.to_int_unchecked()
101 impl FloatToInt<i32> for f32 {
102 fn cast(self) -> i32 {
105 unsafe fn cast_unchecked(self) -> i32 {
106 self.to_int_unchecked()
109 impl FloatToInt<u32> for f32 {
110 fn cast(self) -> u32 {
113 unsafe fn cast_unchecked(self) -> u32 {
114 self.to_int_unchecked()
117 impl FloatToInt<i64> for f32 {
118 fn cast(self) -> i64 {
121 unsafe fn cast_unchecked(self) -> i64 {
122 self.to_int_unchecked()
125 impl FloatToInt<u64> for f32 {
126 fn cast(self) -> u64 {
129 unsafe fn cast_unchecked(self) -> u64 {
130 self.to_int_unchecked()
134 impl FloatToInt<i8> for f64 {
135 fn cast(self) -> i8 {
138 unsafe fn cast_unchecked(self) -> i8 {
139 self.to_int_unchecked()
142 impl FloatToInt<i32> for f64 {
143 fn cast(self) -> i32 {
146 unsafe fn cast_unchecked(self) -> i32 {
147 self.to_int_unchecked()
150 impl FloatToInt<u32> for f64 {
151 fn cast(self) -> u32 {
154 unsafe fn cast_unchecked(self) -> u32 {
155 self.to_int_unchecked()
158 impl FloatToInt<i64> for f64 {
159 fn cast(self) -> i64 {
162 unsafe fn cast_unchecked(self) -> i64 {
163 self.to_int_unchecked()
166 impl FloatToInt<u64> for f64 {
167 fn cast(self) -> u64 {
170 unsafe fn cast_unchecked(self) -> u64 {
171 self.to_int_unchecked()
174 // FIXME emscripten does not support i128
175 #[cfg(not(target_os = "emscripten"))]
176 impl FloatToInt<i128> for f64 {
177 fn cast(self) -> i128 {
180 unsafe fn cast_unchecked(self) -> i128 {
181 self.to_int_unchecked()
184 // FIXME emscripten does not support i128
185 #[cfg(not(target_os = "emscripten"))]
186 impl FloatToInt<u128> for f64 {
187 fn cast(self) -> u128 {
190 unsafe fn cast_unchecked(self) -> u128 {
191 self.to_int_unchecked()
195 /// Test this cast both via `as` and via `to_int_unchecked` (i.e., it must not saturate).
198 fn test_both_cast<F, I>(x: F, y: I)
201 I: PartialEq + Debug,
203 assert_eq!(x.cast(), y);
204 assert_eq!(unsafe { x.cast_unchecked() }, y);
209 test_both_cast::<f32, i8>(127.99, 127);
210 test_both_cast::<f32, i8>(-128.99, -128);
213 test_both_cast::<f32, i32>(0.0, 0);
214 test_both_cast::<f32, i32>(-0.0, 0);
215 test_both_cast::<f32, i32>(/*0x1p-149*/ f32::from_bits(0x00000001), 0);
216 test_both_cast::<f32, i32>(/*-0x1p-149*/ f32::from_bits(0x80000001), 0);
217 test_both_cast::<f32, i32>(/*0x1.19999ap+0*/ f32::from_bits(0x3f8ccccd), 1);
218 test_both_cast::<f32, i32>(/*-0x1.19999ap+0*/ f32::from_bits(0xbf8ccccd), -1);
219 test_both_cast::<f32, i32>(1.9, 1);
220 test_both_cast::<f32, i32>(-1.9, -1);
221 test_both_cast::<f32, i32>(5.0, 5);
222 test_both_cast::<f32, i32>(-5.0, -5);
223 test_both_cast::<f32, i32>(2147483520.0, 2147483520);
224 test_both_cast::<f32, i32>(-2147483648.0, -2147483648);
225 // unrepresentable casts
226 assert_eq::<i32>(2147483648.0f32 as i32, i32::MAX);
227 assert_eq::<i32>(-2147483904.0f32 as i32, i32::MIN);
228 assert_eq::<i32>(f32::MAX as i32, i32::MAX);
229 assert_eq::<i32>(f32::MIN as i32, i32::MIN);
230 assert_eq::<i32>(f32::INFINITY as i32, i32::MAX);
231 assert_eq::<i32>(f32::NEG_INFINITY as i32, i32::MIN);
232 assert_eq::<i32>(f32::NAN as i32, 0);
233 assert_eq::<i32>((-f32::NAN) as i32, 0);
236 test_both_cast::<f32, u32>(0.0, 0);
237 test_both_cast::<f32, u32>(-0.0, 0);
238 test_both_cast::<f32, u32>(-0.9999999, 0);
239 test_both_cast::<f32, u32>(/*0x1p-149*/ f32::from_bits(0x1), 0);
240 test_both_cast::<f32, u32>(/*-0x1p-149*/ f32::from_bits(0x80000001), 0);
241 test_both_cast::<f32, u32>(/*0x1.19999ap+0*/ f32::from_bits(0x3f8ccccd), 1);
242 test_both_cast::<f32, u32>(1.9, 1);
243 test_both_cast::<f32, u32>(5.0, 5);
244 test_both_cast::<f32, u32>(2147483648.0, 0x8000_0000);
245 test_both_cast::<f32, u32>(4294967040.0, 0u32.wrapping_sub(256));
246 test_both_cast::<f32, u32>(/*-0x1.ccccccp-1*/ f32::from_bits(0xbf666666), 0);
247 test_both_cast::<f32, u32>(/*-0x1.fffffep-1*/ f32::from_bits(0xbf7fffff), 0);
248 test_both_cast::<f32, u32>((u32::MAX - 128) as f32, u32::MAX - 255); // rounding loss
250 // unrepresentable casts:
252 // rounds up and then becomes unrepresentable
253 assert_eq::<u32>((u32::MAX - 127) as f32 as u32, u32::MAX);
255 assert_eq::<u32>(4294967296.0f32 as u32, u32::MAX);
256 assert_eq::<u32>(-5.0f32 as u32, 0);
257 assert_eq::<u32>(f32::MAX as u32, u32::MAX);
258 assert_eq::<u32>(f32::MIN as u32, 0);
259 assert_eq::<u32>(f32::INFINITY as u32, u32::MAX);
260 assert_eq::<u32>(f32::NEG_INFINITY as u32, 0);
261 assert_eq::<u32>(f32::NAN as u32, 0);
262 assert_eq::<u32>((-f32::NAN) as u32, 0);
265 test_both_cast::<f32, i64>(4294967296.0, 4294967296);
266 test_both_cast::<f32, i64>(-4294967296.0, -4294967296);
267 test_both_cast::<f32, i64>(9223371487098961920.0, 9223371487098961920);
268 test_both_cast::<f32, i64>(-9223372036854775808.0, -9223372036854775808);
271 test_both_cast::<f64, i8>(127.99, 127);
272 test_both_cast::<f64, i8>(-128.99, -128);
275 test_both_cast::<f64, i32>(0.0, 0);
276 test_both_cast::<f64, i32>(-0.0, 0);
277 test_both_cast::<f64, i32>(/*0x1.199999999999ap+0*/ f64::from_bits(0x3ff199999999999a), 1);
278 test_both_cast::<f64, i32>(
279 /*-0x1.199999999999ap+0*/ f64::from_bits(0xbff199999999999a),
282 test_both_cast::<f64, i32>(1.9, 1);
283 test_both_cast::<f64, i32>(-1.9, -1);
284 test_both_cast::<f64, i32>(1e8, 100_000_000);
285 test_both_cast::<f64, i32>(2147483647.0, 2147483647);
286 test_both_cast::<f64, i32>(-2147483648.0, -2147483648);
287 // unrepresentable casts
288 assert_eq::<i32>(2147483648.0f64 as i32, i32::MAX);
289 assert_eq::<i32>(-2147483649.0f64 as i32, i32::MIN);
292 test_both_cast::<f64, i64>(0.0, 0);
293 test_both_cast::<f64, i64>(-0.0, 0);
294 test_both_cast::<f64, i64>(/*0x0.0000000000001p-1022*/ f64::from_bits(0x1), 0);
295 test_both_cast::<f64, i64>(
296 /*-0x0.0000000000001p-1022*/ f64::from_bits(0x8000000000000001),
299 test_both_cast::<f64, i64>(/*0x1.199999999999ap+0*/ f64::from_bits(0x3ff199999999999a), 1);
300 test_both_cast::<f64, i64>(
301 /*-0x1.199999999999ap+0*/ f64::from_bits(0xbff199999999999a),
304 test_both_cast::<f64, i64>(5.0, 5);
305 test_both_cast::<f64, i64>(5.9, 5);
306 test_both_cast::<f64, i64>(-5.0, -5);
307 test_both_cast::<f64, i64>(-5.9, -5);
308 test_both_cast::<f64, i64>(4294967296.0, 4294967296);
309 test_both_cast::<f64, i64>(-4294967296.0, -4294967296);
310 test_both_cast::<f64, i64>(9223372036854774784.0, 9223372036854774784);
311 test_both_cast::<f64, i64>(-9223372036854775808.0, -9223372036854775808);
312 // unrepresentable casts
313 assert_eq::<i64>(9223372036854775808.0f64 as i64, i64::MAX);
314 assert_eq::<i64>(-9223372036854777856.0f64 as i64, i64::MIN);
315 assert_eq::<i64>(f64::MAX as i64, i64::MAX);
316 assert_eq::<i64>(f64::MIN as i64, i64::MIN);
317 assert_eq::<i64>(f64::INFINITY as i64, i64::MAX);
318 assert_eq::<i64>(f64::NEG_INFINITY as i64, i64::MIN);
319 assert_eq::<i64>(f64::NAN as i64, 0);
320 assert_eq::<i64>((-f64::NAN) as i64, 0);
323 test_both_cast::<f64, u64>(0.0, 0);
324 test_both_cast::<f64, u64>(-0.0, 0);
325 test_both_cast::<f64, u64>(-0.99999999999, 0);
326 test_both_cast::<f64, u64>(5.0, 5);
327 test_both_cast::<f64, u64>(1e16, 10000000000000000);
328 test_both_cast::<f64, u64>((u64::MAX - 1024) as f64, u64::MAX - 2047); // rounding loss
329 test_both_cast::<f64, u64>(9223372036854775808.0, 9223372036854775808);
330 // unrepresentable casts
331 assert_eq::<u64>(-5.0f64 as u64, 0);
332 // rounds up and then becomes unrepresentable
333 assert_eq::<u64>((u64::MAX - 1023) as f64 as u64, u64::MAX);
334 assert_eq::<u64>(18446744073709551616.0f64 as u64, u64::MAX);
335 assert_eq::<u64>(f64::MAX as u64, u64::MAX);
336 assert_eq::<u64>(f64::MIN as u64, 0);
337 assert_eq::<u64>(f64::INFINITY as u64, u64::MAX);
338 assert_eq::<u64>(f64::NEG_INFINITY as u64, 0);
339 assert_eq::<u64>(f64::NAN as u64, 0);
340 assert_eq::<u64>((-f64::NAN) as u64, 0);
342 // FIXME emscripten does not support i128
343 #[cfg(not(target_os = "emscripten"))]
346 assert_eq::<i128>(f64::MAX as i128, i128::MAX);
347 assert_eq::<i128>(f64::MIN as i128, i128::MIN);
350 assert_eq::<u128>(f64::MAX as u128, u128::MAX);
351 assert_eq::<u128>(f64::MIN as u128, 0);
355 assert_eq::<f32>(127i8 as f32, 127.0);
356 assert_eq::<f32>(2147483647i32 as f32, 2147483648.0);
357 assert_eq::<f32>((-2147483648i32) as f32, -2147483648.0);
358 assert_eq::<f32>(1234567890i32 as f32, /*0x1.26580cp+30*/ f32::from_bits(0x4e932c06));
359 assert_eq::<f32>(16777217i32 as f32, 16777216.0);
360 assert_eq::<f32>((-16777217i32) as f32, -16777216.0);
361 assert_eq::<f32>(16777219i32 as f32, 16777220.0);
362 assert_eq::<f32>((-16777219i32) as f32, -16777220.0);
364 0x7fffff4000000001i64 as f32,
365 /*0x1.fffffep+62*/ f32::from_bits(0x5effffff),
368 0x8000004000000001u64 as i64 as f32,
369 /*-0x1.fffffep+62*/ f32::from_bits(0xdeffffff),
372 0x0020000020000001i64 as f32,
373 /*0x1.000002p+53*/ f32::from_bits(0x5a000001),
376 0xffdfffffdfffffffu64 as i64 as f32,
377 /*-0x1.000002p+53*/ f32::from_bits(0xda000001),
379 // FIXME emscripten does not support i128
380 #[cfg(not(target_os = "emscripten"))]
382 assert_eq::<f32>(i128::MIN as f32, -170141183460469231731687303715884105728.0f32);
383 assert_eq::<f32>(u128::MAX as f32, f32::INFINITY); // saturation
387 assert_eq::<f64>(127i8 as f64, 127.0);
388 assert_eq::<f64>(i16::MIN as f64, -32768.0f64);
389 assert_eq::<f64>(2147483647i32 as f64, 2147483647.0);
390 assert_eq::<f64>(-2147483648i32 as f64, -2147483648.0);
391 assert_eq::<f64>(987654321i32 as f64, 987654321.0);
392 assert_eq::<f64>(9223372036854775807i64 as f64, 9223372036854775807.0);
393 assert_eq::<f64>(-9223372036854775808i64 as f64, -9223372036854775808.0);
394 assert_eq::<f64>(4669201609102990i64 as f64, 4669201609102990.0); // Feigenbaum (?)
395 assert_eq::<f64>(9007199254740993i64 as f64, 9007199254740992.0);
396 assert_eq::<f64>(-9007199254740993i64 as f64, -9007199254740992.0);
397 assert_eq::<f64>(9007199254740995i64 as f64, 9007199254740996.0);
398 assert_eq::<f64>(-9007199254740995i64 as f64, -9007199254740996.0);
399 // FIXME emscripten does not support i128
400 #[cfg(not(target_os = "emscripten"))]
403 assert_eq::<f64>(u128::MAX as f64, 340282366920938463463374607431768211455.0f64);
407 assert_eq::<u64>((0.0f32 as f64).to_bits(), 0.0f64.to_bits());
408 assert_eq::<u64>(((-0.0f32) as f64).to_bits(), (-0.0f64).to_bits());
409 assert_eq::<f64>(5.0f32 as f64, 5.0f64);
411 /*0x1p-149*/ f32::from_bits(0x1) as f64,
412 /*0x1p-149*/ f64::from_bits(0x36a0000000000000),
415 /*-0x1p-149*/ f32::from_bits(0x80000001) as f64,
416 /*-0x1p-149*/ f64::from_bits(0xb6a0000000000000),
419 /*0x1.fffffep+127*/ f32::from_bits(0x7f7fffff) as f64,
420 /*0x1.fffffep+127*/ f64::from_bits(0x47efffffe0000000),
423 /*-0x1.fffffep+127*/ (-f32::from_bits(0x7f7fffff)) as f64,
424 /*-0x1.fffffep+127*/ -f64::from_bits(0x47efffffe0000000),
427 /*0x1p-119*/ f32::from_bits(0x4000000) as f64,
428 /*0x1p-119*/ f64::from_bits(0x3880000000000000),
431 /*0x1.8f867ep+125*/ f32::from_bits(0x7e47c33f) as f64,
432 6.6382536710104395e+37,
434 assert_eq::<f64>(f32::INFINITY as f64, f64::INFINITY);
435 assert_eq::<f64>(f32::NEG_INFINITY as f64, f64::NEG_INFINITY);
438 assert_eq::<u32>((0.0f64 as f32).to_bits(), 0.0f32.to_bits());
439 assert_eq::<u32>(((-0.0f64) as f32).to_bits(), (-0.0f32).to_bits());
440 assert_eq::<f32>(5.0f64 as f32, 5.0f32);
441 assert_eq::<f32>(/*0x0.0000000000001p-1022*/ f64::from_bits(0x1) as f32, 0.0);
442 assert_eq::<f32>(/*-0x0.0000000000001p-1022*/ (-f64::from_bits(0x1)) as f32, -0.0);
444 /*0x1.fffffe0000000p-127*/ f64::from_bits(0x380fffffe0000000) as f32,
445 /*0x1p-149*/ f32::from_bits(0x800000),
448 /*0x1.4eae4f7024c7p+108*/ f64::from_bits(0x46b4eae4f7024c70) as f32,
449 /*0x1.4eae5p+108*/ f32::from_bits(0x75a75728),
451 assert_eq::<f32>(f64::MAX as f32, f32::INFINITY);
452 assert_eq::<f32>(f64::MIN as f32, f32::NEG_INFINITY);
453 assert_eq::<f32>(f64::INFINITY as f32, f32::INFINITY);
454 assert_eq::<f32>(f64::NEG_INFINITY as f32, f32::NEG_INFINITY);
458 casts(); // from miri's tests
460 common_fptoi_tests!(f* -> i8 i16 i32 i64 u8 u16 u32 u64);
461 fptoui_tests!(f* -> u8 u16 u32 u64);
462 // FIXME emscripten does not support i128
463 #[cfg(not(target_os = "emscripten"))]
465 common_fptoi_tests!(f* -> i128 u128);
466 fptoui_tests!(f* -> u128);
469 // The following tests cover edge cases for some integer types.
472 test!(254., f* -> u8, 254);
473 test!(256., f* -> u8, 255);
476 test!(-127., f* -> i8, -127);
477 test!(-129., f* -> i8, -128);
478 test!(126., f* -> i8, 126);
479 test!(128., f* -> i8, 127);
482 // -2147483648. is i32::MIN (exactly)
483 test!(-2147483648., f* -> i32, i32::MIN);
484 // 2147483648. is i32::MAX rounded up
485 test!(2147483648., f32 -> i32, 2147483647);
486 // With 24 significand bits, floats with magnitude in [2^30 + 1, 2^31] are rounded to
487 // multiples of 2^7. Therefore, nextDown(round(i32::MAX)) is 2^31 - 128:
488 test!(2147483520., f32 -> i32, 2147483520);
489 // Similarly, nextUp(i32::MIN) is i32::MIN + 2^8 and nextDown(i32::MIN) is i32::MIN - 2^7
490 test!(-2147483904., f* -> i32, i32::MIN);
491 test!(-2147483520., f* -> i32, -2147483520);
494 // round(MAX) and nextUp(round(MAX))
495 test!(4294967040., f* -> u32, 4294967040);
496 test!(4294967296., f* -> u32, 4294967295);
499 #[cfg(not(target_os = "emscripten"))]
502 test!(f32::MAX, f32 -> u128, 0xffffff00000000000000000000000000);
503 // nextDown(f32::MAX) = 2^128 - 2 * 2^104
504 const SECOND_LARGEST_F32: f32 = 340282326356119256160033759537265639424.;
505 test!(SECOND_LARGEST_F32, f32 -> u128, 0xfffffe00000000000000000000000000);