rust/tests/codegen/inherit_overflow.rs
Mark Rousskov 00f4daa276 Codegen const panic messages as function calls
This skips emitting extra arguments at every callsite (of which there
can be many). For a librustc_driver build with overflow checks enabled,
this cuts 0.7MB from the resulting binary.
2024-03-22 09:55:50 -04:00

15 lines
565 B
Rust

//@ compile-flags: -Zmir-enable-passes=+Inline,+GVN --crate-type lib
//@ revisions: ASSERT NOASSERT
//@[ASSERT] compile-flags: -Coverflow-checks=on
//@[NOASSERT] compile-flags: -Coverflow-checks=off
// CHECK-LABEL: define{{.*}} @assertion
// ASSERT: call void @{{.*4core9panicking11panic_const24panic_const_add_overflow}}
// NOASSERT: ret i8 0
#[no_mangle]
pub fn assertion() -> u8 {
// Optimized MIR will replace this `CheckedBinaryOp` by `const (0, true)`.
// Verify that codegen does or does not emit the panic.
<u8 as std::ops::Add>::add(255, 1)
}