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librustc_codegen_llvm: Don't eliminate empty structs in C ABI on linux-sparc64

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This is in accordance with the SPARC Compliance Definition 2.4.1,
Page 3P-12. It says that structs of up to 8 bytes (which applies
to empty structs as well) are to be passed in one register.
This commit is contained in:
Michael Karcher 2018-12-23 20:33:52 +01:00 committed by John Paul Adrian Glaubitz
parent ddab10a692
commit 65dabd6eaf
1 changed files with 6 additions and 2 deletions
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8
src/librustc_codegen_llvm/abi.rs
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@ -456,6 +456,9 @@ impl<'tcx> FnTypeExt<'tcx> for FnType<'tcx, Ty<'tcx>> {
let linux_s390x = target.target_os == "linux"
&& target.arch == "s390x"
&& target.target_env == "gnu";
let linux_sparc64 = target.target_os == "linux"
&& target.arch == "sparc64"
&& target.target_env == "gnu";
let rust_abi = match sig.abi {
RustIntrinsic | PlatformIntrinsic | Rust | RustCall => true,
_ => false
@ -526,8 +529,9 @@ impl<'tcx> FnTypeExt<'tcx> for FnType<'tcx, Ty<'tcx>> {
if arg.layout.is_zst() {
// For some forsaken reason, x86_64-pc-windows-gnu
// doesn't ignore zero-sized struct arguments.
// The same is true for s390x-unknown-linux-gnu.
if is_return || rust_abi || (!win_x64_gnu && !linux_s390x) {
// The same is true for s390x-unknown-linux-gnu
// and sparc64-unknown-linux-gnu.
if is_return || rust_abi || (!win_x64_gnu && !linux_s390x && !linux_sparc64) {
arg.mode = PassMode::Ignore;
}
}