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miri: make NaN generation non-deterministic #116551
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r? @davidtwco (rustbot has picked a reviewer for you, use r? to override) |
Some changes occurred to the CTFE / Miri engine cc @rust-lang/miri The Miri subtree was changed cc @rust-lang/miri |
_inputs: &[F1], | ||
) -> F2 { | ||
// By default we always return the preferred NaN. | ||
F2::NAN |
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This is a change in behavior for some cases: apfloat does sometimes propagate the payload of an input, e.g. for casts; with this PR const-eval is changed to never propagate and always generate a positive preferred NaN.
The Miri subtree was changed cc @rust-lang/miri Some changes occurred to the CTFE / Miri engine cc @rust-lang/miri |
r? @oli-obk |
I didn't check the tests, just the logic, but that lgtm @bors r+ |
☀️ Test successful - checks-actions |
Finished benchmarking commit (061c330): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesThis benchmark run did not return any relevant results for this metric. Binary sizeThis benchmark run did not return any relevant results for this metric. Bootstrap: 627.375s -> 625.33s (-0.33%) |
48: Pull upstream master 2023 10 12 r=tshepang a=Dajamante * rust-lang/rust#113487 * rust-lang/rust#116506 * rust-lang/rust#116448 * rust-lang/rust#116640 * rust-lang/rust#116627 * rust-lang/rust#116597 * rust-lang/rust#116436 * rust-lang/rust#116315 * rust-lang/rust#116219 * rust-lang/rust#113218 * rust-lang/rust#115937 * rust-lang/rust#116014 * rust-lang/rust#116623 * rust-lang/rust#112818 * rust-lang/rust#115948 * rust-lang/rust#116622 * rust-lang/rust#116621 * rust-lang/rust#116612 * rust-lang/rust#116611 * rust-lang/rust#116530 * rust-lang/rust#95967 * rust-lang/rust#116578 * rust-lang/rust#113915 * rust-lang/rust#116605 * rust-lang/rust#116574 * rust-lang/rust#116560 * rust-lang/rust#116559 * rust-lang/rust#116503 * rust-lang/rust#116444 * rust-lang/rust#116250 * rust-lang/rust#109422 * rust-lang/rust#116598 * rust-lang/rust#116596 * rust-lang/rust#116595 * rust-lang/rust#116589 * rust-lang/rust#116586 * rust-lang/rust#116551 * rust-lang/rust#116409 * rust-lang/rust#116548 * rust-lang/rust#116366 * rust-lang/rust#109882 * rust-lang/rust#116497 * rust-lang/rust#116532 * rust-lang/rust#116569 * rust-lang/rust#116561 * rust-lang/rust#116556 * rust-lang/rust#116549 * rust-lang/rust#116543 * rust-lang/rust#116537 * rust-lang/rust#115882 * rust-lang/rust#116142 * rust-lang/rust#115238 * rust-lang/rust#116533 * rust-lang/rust#116096 * rust-lang/rust#116468 * rust-lang/rust#116515 * rust-lang/rust#116454 * rust-lang/rust#116183 * rust-lang/rust#116514 * rust-lang/rust#116509 * rust-lang/rust#116487 * rust-lang/rust#116486 * rust-lang/rust#116450 * rust-lang/rust#114623 * rust-lang/rust#116416 * rust-lang/rust#116437 * rust-lang/rust#100806 * rust-lang/rust#116330 * rust-lang/rust#116310 * rust-lang/rust#115583 * rust-lang/rust#116457 * rust-lang/rust#116508 * rust-lang/rust#109214 * rust-lang/rust#116318 * rust-lang/rust#116501 * rust-lang/rust#116500 * rust-lang/rust#116458 * rust-lang/rust#116400 * rust-lang/rust#116277 * rust-lang/rust#114709 * rust-lang/rust#116492 * rust-lang/rust#116484 * rust-lang/rust#116481 * rust-lang/rust#116474 * rust-lang/rust#116466 * rust-lang/rust#116423 * rust-lang/rust#116297 * rust-lang/rust#114564 * rust-lang/rust#114811 * rust-lang/rust#116489 * rust-lang/rust#115304 Co-authored-by: Peter Hall <[email protected]> Co-authored-by: Emanuele Vannacci <[email protected]> Co-authored-by: Neven Villani <[email protected]> Co-authored-by: Alex Macleod <[email protected]> Co-authored-by: Tamir Duberstein <[email protected]> Co-authored-by: Eduardo Sánchez Muñoz <[email protected]> Co-authored-by: koka <[email protected]> Co-authored-by: bors <[email protected]> Co-authored-by: Philipp Krones <[email protected]> Co-authored-by: Camille GILLOT <[email protected]> Co-authored-by: Esteban Küber <[email protected]> Co-authored-by: Ralf Jung <[email protected]>
48: Pull upstream master 2023 10 12 r=tshepang a=Dajamante * rust-lang/rust#113487 * rust-lang/rust#116506 * rust-lang/rust#116448 * rust-lang/rust#116640 * rust-lang/rust#116627 * rust-lang/rust#116597 * rust-lang/rust#116436 * rust-lang/rust#116315 * rust-lang/rust#116219 * rust-lang/rust#113218 * rust-lang/rust#115937 * rust-lang/rust#116014 * rust-lang/rust#116623 * rust-lang/rust#112818 * rust-lang/rust#115948 * rust-lang/rust#116622 * rust-lang/rust#116621 * rust-lang/rust#116612 * rust-lang/rust#116611 * rust-lang/rust#116530 * rust-lang/rust#95967 * rust-lang/rust#116578 * rust-lang/rust#113915 * rust-lang/rust#116605 * rust-lang/rust#116574 * rust-lang/rust#116560 * rust-lang/rust#116559 * rust-lang/rust#116503 * rust-lang/rust#116444 * rust-lang/rust#116250 * rust-lang/rust#109422 * rust-lang/rust#116598 * rust-lang/rust#116596 * rust-lang/rust#116595 * rust-lang/rust#116589 * rust-lang/rust#116586 * rust-lang/rust#116551 * rust-lang/rust#116409 * rust-lang/rust#116548 * rust-lang/rust#116366 * rust-lang/rust#109882 * rust-lang/rust#116497 * rust-lang/rust#116532 * rust-lang/rust#116569 * rust-lang/rust#116561 * rust-lang/rust#116556 * rust-lang/rust#116549 * rust-lang/rust#116543 * rust-lang/rust#116537 * rust-lang/rust#115882 * rust-lang/rust#116142 * rust-lang/rust#115238 * rust-lang/rust#116533 * rust-lang/rust#116096 * rust-lang/rust#116468 * rust-lang/rust#116515 * rust-lang/rust#116454 * rust-lang/rust#116183 * rust-lang/rust#116514 * rust-lang/rust#116509 * rust-lang/rust#116487 * rust-lang/rust#116486 * rust-lang/rust#116450 * rust-lang/rust#114623 * rust-lang/rust#116416 * rust-lang/rust#116437 * rust-lang/rust#100806 * rust-lang/rust#116330 * rust-lang/rust#116310 * rust-lang/rust#115583 * rust-lang/rust#116457 * rust-lang/rust#116508 * rust-lang/rust#109214 * rust-lang/rust#116318 * rust-lang/rust#116501 * rust-lang/rust#116500 * rust-lang/rust#116458 * rust-lang/rust#116400 * rust-lang/rust#116277 * rust-lang/rust#114709 * rust-lang/rust#116492 * rust-lang/rust#116484 * rust-lang/rust#116481 * rust-lang/rust#116474 * rust-lang/rust#116466 * rust-lang/rust#116423 * rust-lang/rust#116297 * rust-lang/rust#114564 * rust-lang/rust#114811 * rust-lang/rust#116489 * rust-lang/rust#115304 Co-authored-by: Emanuele Vannacci <[email protected]> Co-authored-by: Neven Villani <[email protected]> Co-authored-by: Alex Macleod <[email protected]> Co-authored-by: Tamir Duberstein <[email protected]> Co-authored-by: Eduardo Sánchez Muñoz <[email protected]> Co-authored-by: koka <[email protected]> Co-authored-by: bors <[email protected]> Co-authored-by: Philipp Krones <[email protected]> Co-authored-by: Camille GILLOT <[email protected]> Co-authored-by: Esteban Küber <[email protected]> Co-authored-by: Ralf Jung <[email protected]> Co-authored-by: ShE3py <[email protected]>
This implements the LLVM semantics for NaN generation. I will soon submit an RFC to make this also officially the Rust semantics, but it has been our de-facto semantics for a long time so there's no reason Miri has to wait for that RFC. This PR just better aligns Miri with codegen.
This PR does that just for the operations that have MIR primitives; a future PR will adjust the intrinsics.