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42 lines
926 B
Rust
42 lines
926 B
Rust
// unit-test: GVN
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// Check that we do not propagate past an indirect mutation.
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#![feature(raw_ref_op)]
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// EMIT_MIR indirect_mutation.foo.GVN.diff
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fn foo() {
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// CHECK-LABEL: fn foo(
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// CHECK: debug u => _1;
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// CHECK: debug y => _3;
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// CHECK: _1 = const (1_i32,);
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// CHECK: _2 = &mut (_1.0: i32);
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// CHECK: (*_2) = const 5_i32;
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// CHECK: _4 = (_1.0: i32);
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// CHECK: _3 = Eq(move _4, const 5_i32);
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let mut u = (1,);
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*&mut u.0 = 5;
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let y = { u.0 } == 5;
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}
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// EMIT_MIR indirect_mutation.bar.GVN.diff
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fn bar() {
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// CHECK-LABEL: fn bar(
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// CHECK: debug v => _1;
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// CHECK: debug y => _4;
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// CHECK: _3 = &raw mut (_1.0: i32);
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// CHECK: (*_3) = const 5_i32;
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// CHECK: _5 = (_1.0: i32);
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// CHECK: _4 = Eq(move _5, const 5_i32);
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let mut v = (1,);
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unsafe {
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*&raw mut v.0 = 5;
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}
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let y = { v.0 } == 5;
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}
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fn main() {
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foo();
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bar();
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}
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