1 // Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 use abi::{FnType, ArgType, LayoutExt, Reg, RegKind, Uniform};
12 use context::CrateContext;
15 fn is_homogeneous_aggregate<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>)
17 arg.layout.homogeneous_aggregate(ccx).and_then(|unit| {
18 let size = arg.layout.size;
20 // Ensure we have at most four uniquely addressable members.
21 if size > unit.size.checked_mul(4, ccx).unwrap() {
25 let valid_unit = match unit.kind {
26 RegKind::Integer => false,
27 RegKind::Float => true,
28 RegKind::Vector => size.bits() == 64 || size.bits() == 128
42 fn classify_ret_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, ret: &mut ArgType<'tcx>, vfp: bool) {
43 if !ret.layout.is_aggregate() {
44 ret.extend_integer_width_to(32);
49 if let Some(uniform) = is_homogeneous_aggregate(ccx, ret) {
55 let size = ret.layout.size;
56 let bits = size.bits();
58 let unit = if bits <= 8 {
60 } else if bits <= 16 {
74 fn classify_arg_ty<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, arg: &mut ArgType<'tcx>, vfp: bool) {
75 if !arg.layout.is_aggregate() {
76 arg.extend_integer_width_to(32);
81 if let Some(uniform) = is_homogeneous_aggregate(ccx, arg) {
87 let align = arg.layout.align.abi();
88 let total = arg.layout.size;
90 unit: if align <= 4 { Reg::i32() } else { Reg::i64() },
95 pub fn compute_abi_info<'a, 'tcx>(ccx: &CrateContext<'a, 'tcx>, fty: &mut FnType<'tcx>) {
96 // If this is a target with a hard-float ABI, and the function is not explicitly
97 // `extern "aapcs"`, then we must use the VFP registers for homogeneous aggregates.
98 let vfp = ccx.sess().target.target.llvm_target.ends_with("hf")
99 && fty.cconv != CallConv::ArmAapcsCallConv
102 if !fty.ret.is_ignore() {
103 classify_ret_ty(ccx, &mut fty.ret, vfp);
106 for arg in &mut fty.args {
107 if arg.is_ignore() { continue; }
108 classify_arg_ty(ccx, arg, vfp);