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# dmd.argtypes_aarch64

Break down a D type into basic (register) types for the AArch64 ABI.
Authors:
Martin Kinkelin
License:
Boost License 1.0

Source argtypes_aarch64.d

Documentation https://dlang.org/phobos/dmd_argtypes_aarch64.html

Coverage https://codecov.io/gh/dlang/dmd/src/master/src/dmd/argtypes_aarch64.d

TypeTuple `toArgTypes_aarch64`(Type `t`);
  This breaks a type down into 'simpler' types that can be passed to a function in registers, and returned in registers. This is the implementation for the AAPCS64 ABI, based on https://github.com/ARM-software/abi-aa/blob/master/aapcs64/aapcs64.rst.
  Parameters:

  Type `t` | type to break down

  Returns:
  tuple of 1 type if `t` can be passed in registers; e.g., a static array for Homogeneous Floating-point/Vector Aggregates (HFVA). A tuple of zero length means the type cannot be passed/returned in registers. null indicates a void.
bool `isHFVA`(Type `t`, int `maxNumElements` = 4, Type* `rewriteType` = null);
  A Homogeneous Floating-point/Vector Aggregate (HFA/HVA) is an ARM/AArch64 concept that consists of up to 4 elements of the same floating point/vector type. It is the aggregate final data layout that matters so structs, unions, static arrays and complex numbers can result in an HFVA.
  simple HFAs: struct F1 {float f;} struct D4 {double a,b,c,d;} interesting HFA: struct {F1[2] vals; float weight;}
  If the type is an HFVA and `rewriteType` is specified, it is set to a corresponding static array type.

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