| //! Verify that Rust implements the expected calling convention for `i128`/`u128`. |
| |
| //@ add-core-stubs |
| //@ compile-flags: -Copt-level=3 --target wasm32-wasip1 |
| //@ needs-llvm-components: webassembly |
| |
| #![crate_type = "lib"] |
| #![no_std] |
| #![no_core] |
| #![feature(no_core, lang_items)] |
| |
| extern crate minicore; |
| |
| extern "C" { |
| fn extern_call(arg0: i128); |
| fn extern_ret() -> i128; |
| } |
| |
| #[no_mangle] |
| pub extern "C" fn pass(_arg0: u32, arg1: i128) { |
| // CHECK-LABEL: @pass( |
| // an i128 is passed via registers |
| // CHECK-SAME: i128 noundef %arg1 |
| // CHECK: call void @extern_call |
| unsafe { extern_call(arg1) }; |
| } |
| |
| // Check that we produce the correct return ABI |
| #[no_mangle] |
| pub extern "C" fn ret(_arg0: u32, arg1: i128) -> i128 { |
| // CHECK-LABEL: @ret( |
| // but an i128 is returned via the stack |
| // CHECK-SAME: sret |
| // CHECK: store i128 %arg1 |
| // CHECK-NEXT: ret void |
| arg1 |
| } |
| |
| // Check that we consume the correct return ABI |
| #[no_mangle] |
| pub extern "C" fn forward(dst: *mut i128) { |
| // CHECK-LABEL: @forward |
| // CHECK-SAME: ptr{{.*}} %dst) |
| // without optimizatons, an intermediate alloca is used |
| // CHECK: call void @extern_ret |
| // CHECK: store i128 |
| // CHECK: ret void |
| unsafe { *dst = extern_ret() }; |
| } |
