30 lines
745 B
Rust
30 lines
745 B
Rust
// EMIT_MIR_FOR_EACH_PANIC_STRATEGY
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// This is a copy of the `dead_stores_79191` test, except that we turn on DSE. This demonstrates
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// that that pass enables this one to do more optimizations.
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//@ test-mir-pass: DestinationPropagation
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//@ compile-flags: -Zmir-enable-passes=+DeadStoreElimination
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fn id<T>(x: T) -> T {
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x
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}
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// EMIT_MIR dead_stores_better.f.DestinationPropagation.after.mir
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pub fn f(mut a: usize) -> usize {
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// CHECK-LABEL: fn f(
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// CHECK: debug a => [[a:_.*]];
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// CHECK: debug b => [[b:_.*]];
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// CHECK: [[b]] = copy [[a]];
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// CHECK: [[a]] = const 5_usize;
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// CHECK: [[a]] = move [[b]];
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// CHECK: id::<usize>(move [[a]])
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let b = a;
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a = 5;
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a = b;
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id(a)
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}
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fn main() {
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f(0);
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}
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