From ef24de24a82fe681581cc130f342363c47c0969a Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 7 Jun 2024 07:48:48 +0200 Subject: Merging upstream version 1.75.0+dfsg1. Signed-off-by: Daniel Baumann --- tests/codegen/unwind-landingpad-inline.rs | 39 +++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 tests/codegen/unwind-landingpad-inline.rs (limited to 'tests/codegen/unwind-landingpad-inline.rs') diff --git a/tests/codegen/unwind-landingpad-inline.rs b/tests/codegen/unwind-landingpad-inline.rs new file mode 100644 index 000000000..0774cefdd --- /dev/null +++ b/tests/codegen/unwind-landingpad-inline.rs @@ -0,0 +1,39 @@ +// min-llvm-version: 17.0.2 +// compile-flags: -Copt-level=3 +// ignore-debug: the debug assertions get in the way +#![crate_type = "lib"] + +// This test checks that we can inline drop_in_place in +// unwind landing pads. + +// Without inlining, the box pointers escape via the call to drop_in_place, +// and LLVM will not optimize out the pointer comparison. +// With inlining, everything should be optimized out. +// See https://github.com/rust-lang/rust/issues/46515 +// CHECK-LABEL: @check_no_escape_in_landingpad +// CHECK: start: +// CHECK-NEXT: __rust_no_alloc_shim_is_unstable +// CHECK-NEXT: __rust_no_alloc_shim_is_unstable +// CHECK-NEXT: ret void +#[no_mangle] +pub fn check_no_escape_in_landingpad(f: fn()) { + let x = &*Box::new(0); + let y = &*Box::new(0); + + if x as *const _ == y as *const _ { + f(); + } +} + +// Without inlining, the compiler can't tell that +// dropping an empty string (in a landing pad) does nothing. +// With inlining, the landing pad should be optimized out. +// See https://github.com/rust-lang/rust/issues/87055 +// CHECK-LABEL: @check_eliminate_noop_drop +// CHECK: call void %g() +// CHECK-NEXT: ret void +#[no_mangle] +pub fn check_eliminate_noop_drop(g: fn()) { + let _var = String::new(); + g(); +} -- cgit v1.2.3