diff --git a/crates/hir-ty/src/consteval/tests/intrinsics.rs b/crates/hir-ty/src/consteval/tests/intrinsics.rs index b74133e24f1..89f3a6d4905 100644 --- a/crates/hir-ty/src/consteval/tests/intrinsics.rs +++ b/crates/hir-ty/src/consteval/tests/intrinsics.rs @@ -163,6 +163,24 @@ fn transmute() { ); } +#[test] +fn read_via_copy() { + check_number( + r#" + extern "rust-intrinsic" { + pub fn read_via_copy(e: *const T) -> T; + pub fn volatile_load(e: *const T) -> T; + } + + const GOAL: i32 = { + let x = 2; + read_via_copy(&x) + volatile_load(&x) + }; + "#, + 4, + ); +} + #[test] fn const_eval_select() { check_number( diff --git a/crates/hir-ty/src/mir/eval/shim.rs b/crates/hir-ty/src/mir/eval/shim.rs index 6cdf9f03c91..8f22bb36568 100644 --- a/crates/hir-ty/src/mir/eval/shim.rs +++ b/crates/hir-ty/src/mir/eval/shim.rs @@ -888,6 +888,13 @@ fn exec_intrinsic( } not_supported!("FnOnce was not available for executing const_eval_select"); } + "read_via_copy" | "volatile_load" => { + let [arg] = args else { + return Err(MirEvalError::TypeError("read_via_copy args are not provided")); + }; + let addr = Address::from_bytes(arg.interval.get(self)?)?; + destination.write_from_interval(self, Interval { addr, size: destination.size }) + } _ => not_supported!("unknown intrinsic {name}"), } }