diff --git a/tests/codegen-llvm/bounds-check-elision-slice-min.rs b/tests/codegen-llvm/bounds-check-elision-slice-min.rs new file mode 100644 index 0000000000000..e160e5da50f93 --- /dev/null +++ b/tests/codegen-llvm/bounds-check-elision-slice-min.rs @@ -0,0 +1,19 @@ +//! Regression test for #: +//! Multiple bounds checking elision failures +//! (ensures bounds checks are properly elided, +//! with no calls to panic_bounds_check in the LLVM IR). + +//@ compile-flags: -C opt-level=3 + +#![crate_type = "lib"] + +// CHECK-LABEL: @foo +// CHECK-NOT: panic_bounds_check +#[no_mangle] +pub fn foo(buf: &[u8], alloced_size: usize) -> &[u8] { + if alloced_size.checked_add(1).map(|total| buf.len() < total).unwrap_or(true) { + return &[]; + } + let size = buf[0]; + &buf[1..1 + usize::min(alloced_size, usize::from(size))] +}