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// a tour of the compiler's optimization hints. the program is valid and runs;
// the hints only show up in the editor (or the lsp cli), never in a normal build.
// each function below triggers one of them.
fn sink(.d p) { free(d*p); return 0; }
// a variable that is written and never read
fn dead() {
let unused = 5;
return 1;
}
// never reassigned, so it could be a const
fn constant() {
let width = 40;
return width + 2;
}
// multiplying by a power of two is a shift
fn shifty(n) { return n * 8; }
// a number with no name
fn magic(n) { return n + 1234; }
// new inside a loop allocates every pass
fn looping() {
let i = 0;
while (i < 3) {
let buf = new(10);
buf[0] = i;
sink(d*buf);
i++;
}
return i;
}
// a small buffer that never leaves the function can live on the stack
fn scratch() {
let buf = new(8);
buf[0] = 7;
return buf[0];
}
// a consuming call takes the object after its allocation
fn handoff() {
let tmp = new(4);
sink(d*tmp);
return 0;
}
fn main() {
put_n(dead() + constant() + shifty(2) + magic(0) + looping() + scratch() + handoff()); put_c(10);
return 0;
}
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