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// Copyright 2012-2013 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use abi::{FnType, ArgType, LayoutExt, Reg, RegKind, Uniform};
use context::CodegenCx;
use llvm::CallConv;
fn is_homogeneous_aggregate<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>, arg: &mut ArgType<'tcx>)
-> Option<Uniform> {
arg.layout.homogeneous_aggregate(cx).and_then(|unit| {
let size = arg.layout.size;
// Ensure we have at most four uniquely addressable members.
if size > unit.size.checked_mul(4, cx).unwrap() {
return None;
}
let valid_unit = match unit.kind {
RegKind::Integer => false,
RegKind::Float => true,
RegKind::Vector => size.bits() == 64 || size.bits() == 128
};
if valid_unit {
Some(Uniform {
unit,
total: size
})
} else {
None
}
})
}
fn classify_ret_ty<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>, ret: &mut ArgType<'tcx>, vfp: bool) {
if !ret.layout.is_aggregate() {
ret.extend_integer_width_to(32);
return;
}
if vfp {
if let Some(uniform) = is_homogeneous_aggregate(cx, ret) {
ret.cast_to(uniform);
return;
}
}
let size = ret.layout.size;
let bits = size.bits();
if bits <= 32 {
let unit = if bits <= 8 {
Reg::i8()
} else if bits <= 16 {
Reg::i16()
} else {
Reg::i32()
};
ret.cast_to(Uniform {
unit,
total: size
});
return;
}
ret.make_indirect();
}
fn classify_arg_ty<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>, arg: &mut ArgType<'tcx>, vfp: bool) {
if !arg.layout.is_aggregate() {
arg.extend_integer_width_to(32);
return;
}
if vfp {
if let Some(uniform) = is_homogeneous_aggregate(cx, arg) {
arg.cast_to(uniform);
return;
}
}
let align = arg.layout.align.abi();
let total = arg.layout.size;
arg.cast_to(Uniform {
unit: if align <= 4 { Reg::i32() } else { Reg::i64() },
total
});
}
pub fn compute_abi_info<'a, 'tcx>(cx: &CodegenCx<'a, 'tcx>, fty: &mut FnType<'tcx>) {
// If this is a target with a hard-float ABI, and the function is not explicitly
// `extern "aapcs"`, then we must use the VFP registers for homogeneous aggregates.
let vfp = cx.sess().target.target.llvm_target.ends_with("hf")
&& fty.cconv != CallConv::ArmAapcsCallConv
&& !fty.variadic;
if !fty.ret.is_ignore() {
classify_ret_ty(cx, &mut fty.ret, vfp);
}
for arg in &mut fty.args {
if arg.is_ignore() { continue; }
classify_arg_ty(cx, arg, vfp);
}
}
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