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//! Verify that Rust implements the expected calling convention for `f128`
//@ 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, f128)]
extern crate minicore;
extern "C" {
fn extern_call(arg0: f128);
fn extern_ret() -> f128;
}
#[no_mangle]
pub extern "C" fn pass(_arg0: u32, arg1: f128) {
// CHECK-LABEL: @pass(
// an f128 is passed via registers
// CHECK-SAME: fp128 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: f128) -> f128 {
// CHECK-LABEL: @ret(
// but an f128 is returned via the stack
// CHECK-SAME: sret
// CHECK: store fp128 %arg1
// CHECK-NEXT: ret void
arg1
}
// Check that we consume the correct return ABI
#[no_mangle]
pub extern "C" fn forward(dst: *mut f128) {
// CHECK-LABEL: @forward
// CHECK-SAME: ptr{{.*}} %dst)
// without optimizatons, an intermediate alloca is used
// CHECK: call void @extern_ret
// CHECK: store fp128
// CHECK: ret void
unsafe { *dst = extern_ret() };
}
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