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rust_for_linux: -Zreg-struct-return commandline flag for X86 (#116973)
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// Checks how `reg-struct-return` flag works with different calling conventions: | ||
// Return struct with 8/16/32/64 bit size will be converted into i8/i16/i32/i64 (like abi_return_struct_as_int target spec). | ||
// x86 only. | ||
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//@ compile-flags: --target i686-unknown-linux-gnu -Zreg-struct-return -O -C no-prepopulate-passes | ||
//@ needs-llvm-components: x86 | ||
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#![crate_type = "lib"] | ||
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pub mod tests { | ||
#[repr(C)] | ||
pub struct Foo { | ||
x: u32, | ||
y: u32, | ||
} | ||
// CHECK: i64 @f1(i32 inreg noundef %_1, i32 inreg noundef %_2) | ||
#[no_mangle] | ||
pub extern "fastcall" fn f1(x: u32, y: u32) -> Foo { | ||
Foo { x, y } | ||
} | ||
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// reg-struct-return doesn't work for "Rust" calling conv | ||
// CHECK: { i32, i32 } @f2(i32 inreg noundef %_1, i32 inreg noundef %_2) | ||
#[no_mangle] | ||
pub extern "Rust" fn f2(x: u32, y: u32) -> Foo { | ||
Foo { x, y } | ||
} | ||
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// CHECK: i64 @f3(i32 inreg noundef %_1, i32 inreg noundef %_2) | ||
#[no_mangle] | ||
pub extern "C" fn f3(x: u32, y: u32) -> Foo { | ||
Foo { x, y } | ||
} | ||
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// CHECK: i64 @f4(i32 inreg noundef %_1, i32 inreg noundef %_2) | ||
#[no_mangle] | ||
pub extern "cdecl" fn f4(x: u32, y: u32) -> Foo { | ||
Foo { x, y } | ||
} | ||
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// CHECK: i64 @f5(i32 inreg noundef %_1, i32 inreg noundef %_2) | ||
#[no_mangle] | ||
pub extern "stdcall" fn f5(x: u32, y: u32) -> Foo { | ||
Foo { x, y } | ||
} | ||
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// CHECK: i64 @f6(i32 inreg noundef %_1, i32 inreg noundef %_2) | ||
#[no_mangle] | ||
pub extern "thiscall" fn f6(x: u32, y: u32) -> Foo { | ||
Foo { x, y } | ||
} | ||
} |