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Diffstat (limited to '')
-rw-r--r-- | compiler/rustc_target/src/abi/call/aarch64.rs | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/compiler/rustc_target/src/abi/call/aarch64.rs b/compiler/rustc_target/src/abi/call/aarch64.rs new file mode 100644 index 000000000..4613a459c --- /dev/null +++ b/compiler/rustc_target/src/abi/call/aarch64.rs @@ -0,0 +1,86 @@ +use crate::abi::call::{ArgAbi, FnAbi, Reg, RegKind, Uniform}; +use crate::abi::{HasDataLayout, TyAbiInterface}; + +fn is_homogeneous_aggregate<'a, Ty, C>(cx: &C, arg: &mut ArgAbi<'a, Ty>) -> Option<Uniform> +where + Ty: TyAbiInterface<'a, C> + Copy, + C: HasDataLayout, +{ + arg.layout.homogeneous_aggregate(cx).ok().and_then(|ha| ha.unit()).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, + }; + + valid_unit.then_some(Uniform { unit, total: size }) + }) +} + +fn classify_ret<'a, Ty, C>(cx: &C, ret: &mut ArgAbi<'a, Ty>) +where + Ty: TyAbiInterface<'a, C> + Copy, + C: HasDataLayout, +{ + if !ret.layout.is_aggregate() { + ret.extend_integer_width_to(32); + return; + } + 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 <= 128 { + ret.cast_to(Uniform { unit: Reg::i64(), total: size }); + return; + } + ret.make_indirect(); +} + +fn classify_arg<'a, Ty, C>(cx: &C, arg: &mut ArgAbi<'a, Ty>) +where + Ty: TyAbiInterface<'a, C> + Copy, + C: HasDataLayout, +{ + if !arg.layout.is_aggregate() { + arg.extend_integer_width_to(32); + return; + } + if let Some(uniform) = is_homogeneous_aggregate(cx, arg) { + arg.cast_to(uniform); + return; + } + let size = arg.layout.size; + let bits = size.bits(); + if bits <= 128 { + arg.cast_to(Uniform { unit: Reg::i64(), total: size }); + return; + } + arg.make_indirect(); +} + +pub fn compute_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>) +where + Ty: TyAbiInterface<'a, C> + Copy, + C: HasDataLayout, +{ + if !fn_abi.ret.is_ignore() { + classify_ret(cx, &mut fn_abi.ret); + } + + for arg in &mut fn_abi.args { + if arg.is_ignore() { + continue; + } + classify_arg(cx, arg); + } +} |