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