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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-17 12:19:50 +0000 |
commit | 2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35 (patch) | |
tree | d325add32978dbdc1db975a438b3a77d571b1ab8 /tests/mir-opt/dataflow-const-prop/enum.rs | |
parent | Releasing progress-linux version 1.68.2+dfsg1-1~progress7.99u1. (diff) | |
download | rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.tar.xz rustc-2e00214b3efbdfeefaa0fe9e8b8fd519de7adc35.zip |
Merging upstream version 1.69.0+dfsg1.
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tests/mir-opt/dataflow-const-prop/enum.rs')
-rw-r--r-- | tests/mir-opt/dataflow-const-prop/enum.rs | 61 |
1 files changed, 58 insertions, 3 deletions
diff --git a/tests/mir-opt/dataflow-const-prop/enum.rs b/tests/mir-opt/dataflow-const-prop/enum.rs index 13288577d..79a20d7ef 100644 --- a/tests/mir-opt/dataflow-const-prop/enum.rs +++ b/tests/mir-opt/dataflow-const-prop/enum.rs @@ -1,13 +1,68 @@ // unit-test: DataflowConstProp -// Not trackable, because variants could be aliased. +#![feature(custom_mir, core_intrinsics, rustc_attrs)] + +use std::intrinsics::mir::*; + enum E { V1(i32), V2(i32) } -// EMIT_MIR enum.main.DataflowConstProp.diff -fn main() { +// EMIT_MIR enum.simple.DataflowConstProp.diff +fn simple() { let e = E::V1(0); let x = match e { E::V1(x) => x, E::V2(x) => x }; } + +#[rustc_layout_scalar_valid_range_start(1)] +#[rustc_nonnull_optimization_guaranteed] +struct NonZeroUsize(usize); + +// EMIT_MIR enum.mutate_discriminant.DataflowConstProp.diff +#[custom_mir(dialect = "runtime", phase = "post-cleanup")] +fn mutate_discriminant() -> u8 { + mir!( + let x: Option<NonZeroUsize>; + { + SetDiscriminant(x, 1); + // This assignment overwrites the niche in which the discriminant is stored. + place!(Field(Field(Variant(x, 1), 0), 0)) = 0_usize; + // So we cannot know the value of this discriminant. + let a = Discriminant(x); + match a { + 0 => bb1, + _ => bad, + } + } + bb1 = { + RET = 1; + Return() + } + bad = { + RET = 2; + Unreachable() + } + ) +} + +// EMIT_MIR enum.multiple.DataflowConstProp.diff +fn multiple(x: bool, i: u8) { + let e = if x { + Some(i) + } else { + None + }; + // The dataflow state must have: + // discriminant(e) => Top + // (e as Some).0 => Top + let x = match e { Some(i) => i, None => 0 }; + // Therefore, `x` should be `Top` here, and no replacement shall happen. + let y = x; +} + +fn main() { + simple(); + mutate_discriminant(); + multiple(false, 5); +} |