| // Reference: CSKY ABI Manual |
| // https://occ-oss-prod.oss-cn-hangzhou.aliyuncs.com/resource//1695027452256/T-HEAD_800_Series_ABI_Standards_Manual.pdf |
| // |
| // Reference: Clang CSKY lowering code |
| // https://github.com/llvm/llvm-project/blob/4a074f32a6914f2a8d7215d78758c24942dddc3d/clang/lib/CodeGen/Targets/CSKY.cpp#L76-L162 |
| |
| use crate::abi::call::{ArgAbi, FnAbi, Reg, Uniform}; |
| |
| fn classify_ret<Ty>(arg: &mut ArgAbi<'_, Ty>) { |
| // For return type, aggregate which <= 2*XLen will be returned in registers. |
| // Otherwise, aggregate will be returned indirectly. |
| if arg.layout.is_aggregate() { |
| let total = arg.layout.size; |
| if total.bits() > 64 { |
| arg.make_indirect(); |
| } else if total.bits() > 32 { |
| arg.cast_to(Uniform { unit: Reg::i32(), total }); |
| } else { |
| arg.cast_to(Reg::i32()); |
| } |
| } else { |
| arg.extend_integer_width_to(32); |
| } |
| } |
| |
| fn classify_arg<Ty>(arg: &mut ArgAbi<'_, Ty>) { |
| // For argument type, the first 4*XLen parts of aggregate will be passed |
| // in registers, and the rest will be passed in stack. |
| // So we can coerce to integers directly and let backend handle it correctly. |
| if arg.layout.is_aggregate() { |
| let total = arg.layout.size; |
| if total.bits() > 32 { |
| arg.cast_to(Uniform { unit: Reg::i32(), total }); |
| } else { |
| arg.cast_to(Reg::i32()); |
| } |
| } else { |
| arg.extend_integer_width_to(32); |
| } |
| } |
| |
| pub fn compute_abi_info<Ty>(fn_abi: &mut FnAbi<'_, Ty>) { |
| if !fn_abi.ret.is_ignore() { |
| classify_ret(&mut fn_abi.ret); |
| } |
| |
| for arg in fn_abi.args.iter_mut() { |
| if arg.is_ignore() { |
| continue; |
| } |
| classify_arg(arg); |
| } |
| } |