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// ignore-wasm32 compiled with panic=abort by default
// Check that CopyProp does not propagate an assignment to a function argument
// (doing so can break usages of the original argument value)
// unit-test: CopyProp
fn dummy(x: u8) -> u8 {
x
}
// EMIT_MIR copy_propagation_arg.foo.CopyProp.diff
fn foo(mut x: u8) {
// calling `dummy` to make a use of `x` that copyprop cannot eliminate
x = dummy(x); // this will assign a local to `x`
}
// EMIT_MIR copy_propagation_arg.bar.CopyProp.diff
fn bar(mut x: u8) {
dummy(x);
x = 5;
}
// EMIT_MIR copy_propagation_arg.baz.CopyProp.diff
fn baz(mut x: i32) -> i32 {
// self-assignment to a function argument should be eliminated
x = x;
x
}
// EMIT_MIR copy_propagation_arg.arg_src.CopyProp.diff
fn arg_src(mut x: i32) -> i32 {
let y = x;
x = 123; // Don't propagate this assignment to `y`
y
}
fn main() {
// Make sure the function actually gets instantiated.
foo(0);
bar(0);
baz(0);
arg_src(0);
}
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