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ABI change: for indirect parameters size_of <= 16, do callee stack copy

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gingerBill
2024-12-05 10:44:53 +00:00
parent cdb86d69b3
commit b36a81ef53
3 changed files with 25 additions and 0 deletions
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src/llvm_backend_proc.cpp
+19
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@@ -579,6 +579,8 @@ gb_internal void lb_begin_procedure_body(lbProcedure *p) {
p->raw_input_parameters = array_make<LLVMValueRef>(permanent_allocator(), raw_input_parameters_count);
LLVMGetParams(p->value, p->raw_input_parameters.data);
bool is_odin_cc = is_calling_convention_odin(ft->calling_convention);
unsigned param_index = 0;
for_array(i, params->variables) {
Entity *e = params->variables[i];
@@ -613,9 +615,26 @@ gb_internal void lb_begin_procedure_body(lbProcedure *p) {
}
} else if (arg_type->kind == lbArg_Indirect) {
if (e->token.string.len != 0 && !is_blank_ident(e->token.string)) {
i64 sz = type_size_of(e->type);
bool do_callee_copy = false;
if (is_odin_cc) {
do_callee_copy = sz <= 16;
if (build_context.internal_by_value) {
do_callee_copy = true;
}
}
lbValue ptr = {};
ptr.value = LLVMGetParam(p->value, param_offset+param_index);
ptr.type = alloc_type_pointer(e->type);
if (do_callee_copy) {
lbValue new_ptr = lb_add_local_generated(p, e->type, false).addr;
lb_mem_copy_non_overlapping(p, new_ptr, ptr, lb_const_int(p->module, t_uint, sz));
ptr = new_ptr;
}
lb_add_entity(p->module, e, ptr);
lb_add_debug_param_variable(p, ptr.value, e->type, e->token, param_index+1, p->decl_block);
}