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#![feature(coverage_attribute)]
//@ edition: 2021
//@ compile-flags: -Zcoverage-options=branch
//@ llvm-cov-flags: --show-branches=count
// Tests for branch coverage of the lazy boolean operators `&&` and `||`,
// as ordinary expressions that aren't part of an `if` condition or similar.
use core::hint::black_box;
// Helper macro to prevent start-of-function spans from being merged into
// spans on the lines we care about.
macro_rules! no_merge {
() => {
for _ in 0..1 {}
};
}
fn branch_and(a: bool, b: bool) {
no_merge!();
// |13 |18 (no branch)
let c = a && b;
black_box(c);
}
fn branch_or(a: bool, b: bool) {
no_merge!();
// |13 |18 (no branch)
let c = a || b;
black_box(c);
}
// Test for chaining one operator several times.
fn chain(x: u32) {
no_merge!();
// |13 |22 |31 |40 (no branch)
let c = x > 1 && x > 2 && x > 4 && x > 8;
black_box(c);
// |13 |22 |31 |40 (no branch)
let d = x < 1 || x < 2 || x < 4 || x < 8;
black_box(d);
}
// Test for nested combinations of different operators.
fn nested_mixed(x: u32) {
no_merge!();
// |14 |23 |35 |44 (no branch)
let c = (x < 4 || x >= 9) && (x < 2 || x >= 10);
black_box(c);
// |14 |23 |34 |44 (no branch)
let d = (x < 4 && x < 1) || (x >= 8 && x >= 10);
black_box(d);
}
#[coverage(off)]
fn main() {
// Use each set of arguments (2^n) times, so that each combination has a
// unique sum, and we can use those sums to verify expected control flow.
// 1x (false, false)
// 2x (false, true)
// 4x (true, false)
// 8x (true, true)
for a in [false, true, true, true, true] {
for b in [false, true, true] {
branch_and(a, b);
branch_or(a, b);
}
}
for x in 0..16 {
chain(x);
nested_mixed(x);
}
}
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