abi_ppc64le.cpp
//===-- abi_ppc64le.cpp - Power v2 ABI description ---------------------*- C++ -*-===//
//
// LDC – the LLVM D compiler
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//===----------------------------------------------------------------------===//
//
// The ABI implementation used for 64 bit little-endian PowerPC targets.
//
// The PowerOpen 64bit ELF v2 ABI can be found here:
// https://members.openpowerfoundation.org/document/dl/576
//===----------------------------------------------------------------------===//
typedef bool AbiState;
AbiState default_abi_state = 0;
// count the homogeneous floating agregate size (saturating at max count of 8)
static unsigned isHFA(jl_datatype_t *ty, jl_datatype_t **ty0)
{
size_t i, l = ty->nfields;
if (l == 0) {
if (*ty0 == NULL) {
if (ty == jl_float64_type || ty == jl_float32_type)
*ty0 = ty;
}
return ty == *ty0 ? 1 : 9;
}
int n = 0;
for (i = 0; i < l; i++) {
jl_value_t *fld = jl_field_type(ty, i);
if (!jl_is_datatype(fld))
return 9;
n += isHFA((jl_datatype_t*)fld, ty0);
if (n > 8)
return 9;
}
return n;
}
bool use_sret(AbiState *state, jl_value_t *ty)
{
// Assume jl_is_datatype(ty) && !jl_is_abstracttype(ty)
jl_datatype_t *dt = (jl_datatype_t*)ty;
jl_datatype_t *ty0 = NULL;
if (dt->size > 16 && isHFA(dt, &ty0) > 8)
return true;
return false;
}
void needPassByRef(AbiState *state, jl_value_t *ty, bool *byRef, bool *inReg)
{
if (!jl_is_datatype(ty) || jl_is_abstracttype(ty) || jl_is_cpointer_type(ty) || jl_is_array_type(ty))
return;
size_t size = jl_datatype_size(ty);
if (size > 64)
*byRef = true;
}
Type *preferred_llvm_type(jl_value_t *ty, bool isret)
{
// Arguments are either scalar or passed by value
if (!jl_is_datatype(ty) || jl_is_abstracttype(ty) || jl_is_cpointer_type(ty) || jl_is_array_type(ty))
return NULL;
jl_datatype_t *dt = (jl_datatype_t*)ty;
size_t size = dt->size;
// don't need to change bitstypes
if (!dt->nfields)
return NULL;
// legalize this into [n x f32/f64]
jl_datatype_t *ty0 = NULL;
int hfa = isHFA(dt, &ty0);
if (hfa <= 8)
return ArrayType::get(ty0 == jl_float32_type ? T_float32 : T_float64, hfa);
// rewrite integer-sized (non-HFA) struct to an array of i64
if (size > 8)
return ArrayType::get(T_int64, (size + 7) / 8);
return Type::getIntNTy(jl_LLVMContext, size * 8);
}
bool need_private_copy(jl_value_t *ty, bool byRef)
{
return false;
}