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37 lines
772 B
Rust
37 lines
772 B
Rust
//@ test-mir-pass: GVN
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#![feature(custom_mir, core_intrinsics)]
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// Check that we do not create overlapping assignments.
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use std::intrinsics::mir::*;
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// EMIT_MIR gvn_overlapping.overlapping.GVN.diff
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#[custom_mir(dialect = "runtime")]
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fn overlapping(_17: Adt) {
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// CHECK-LABEL: fn overlapping(
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// CHECK: let mut [[PTR:.*]]: *mut Adt;
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// CHECK: (*[[PTR]]) = Adt::Some(copy {{.*}});
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mir! {
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let _33: *mut Adt;
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let _48: u32;
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let _73: &Adt;
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{
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_33 = core::ptr::addr_of_mut!(_17);
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_73 = &(*_33);
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_48 = Field(Variant((*_73), 1), 0);
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(*_33) = Adt::Some(_48);
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Return()
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}
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}
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}
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fn main() {
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overlapping(Adt::Some(0));
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}
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enum Adt {
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None,
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Some(u32),
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}
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