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Improve multiple return value copy-elision

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This commit is contained in:
gingerBill
2020-10-20 17:08:55 +01:00
parent c4dbc88a12
commit feeb342c00
4 changed files with 96 additions and 49 deletions
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src/llvm_backend.cpp
+68 -23
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@@ -2430,15 +2430,16 @@ void lb_begin_procedure_body(lbProcedure *p) {
i32 parameter_index = 0;
lbValue return_ptr_value = {};
if (p->type->Proc.return_by_pointer) {
// NOTE(bill): this must be parameter 0
Type *ptr_type = alloc_type_pointer(reduce_tuple_to_single_type(p->type->Proc.results));
Entity *e = alloc_entity_param(nullptr, make_token_ident(str_lit("agg.result")), ptr_type, false, false);
e->flags |= EntityFlag_Sret | EntityFlag_NoAlias;
lbValue return_ptr_value = {};
return_ptr_value.value = LLVMGetParam(p->value, 0);
return_ptr_value.type = alloc_type_pointer(p->type->Proc.abi_compat_result_type);
return_ptr_value.type = ptr_type;
p->return_ptr = lb_addr(return_ptr_value);
lb_add_entity(p->module, e, return_ptr_value);
@@ -2475,37 +2476,31 @@ void lb_begin_procedure_body(lbProcedure *p) {
GB_ASSERT(p->type->Proc.result_count > 0);
TypeTuple *results = &p->type->Proc.results->Tuple;
isize result_index = 0;
for_array(i, results->variables) {
Entity *e = results->variables[i];
if (e->kind != Entity_Variable) {
continue;
}
GB_ASSERT(e->kind == Entity_Variable);
if (e->token.string != "") {
GB_ASSERT(!is_blank_ident(e->token));
lbAddr res = lb_add_local(p, e->type, e);
lbAddr res = {};
if (p->type->Proc.return_by_pointer) {
lbValue ptr = return_ptr_value;
if (results->variables.count != 1) {
ptr = lb_emit_struct_ep(p, ptr, cast(i32)i);
}
lbValue c = {};
switch (e->Variable.param_value.kind) {
case ParameterValue_Constant:
c = lb_const_value(p->module, e->type, e->Variable.param_value.value);
break;
case ParameterValue_Nil:
c = lb_const_nil(p->module, e->type);
break;
case ParameterValue_Location:
GB_PANIC("ParameterValue_Location");
break;
res = lb_addr(ptr);
lb_add_entity(p->module, e, ptr);
} else {
res = lb_add_local(p, e->type, e);
}
if (c.value != nullptr) {
if (e->Variable.param_value.kind != ParameterValue_Invalid) {
lbValue c = lb_handle_param_value(p, e->type, e->Variable.param_value, e->token.pos);
lb_addr_store(p, res, c);
}
}
result_index += 1;
}
}
@@ -12188,7 +12183,7 @@ void lb_generate_code(lbGenerator *gen) {
LLVMPassManagerRef default_function_pass_manager = LLVMCreateFunctionPassManagerForModule(mod);
defer (LLVMDisposePassManager(default_function_pass_manager));
{
/*{
LLVMAddMemCpyOptPass(default_function_pass_manager);
LLVMAddPromoteMemoryToRegisterPass(default_function_pass_manager);
LLVMAddMergedLoadStoreMotionPass(default_function_pass_manager);
@@ -12219,8 +12214,58 @@ void lb_generate_code(lbGenerator *gen) {
LLVMAddLoopVectorizePass(default_function_pass_manager);
}
}*/
if (build_context.optimization_level == 0 && false) {
auto dfpm = default_function_pass_manager;
LLVMAddMemCpyOptPass(dfpm);
LLVMAddPromoteMemoryToRegisterPass(dfpm);
LLVMAddMergedLoadStoreMotionPass(dfpm);
LLVMAddAggressiveInstCombinerPass(dfpm);
LLVMAddConstantPropagationPass(dfpm);
LLVMAddAggressiveDCEPass(dfpm);
LLVMAddMergedLoadStoreMotionPass(dfpm);
LLVMAddPromoteMemoryToRegisterPass(dfpm);
LLVMAddCFGSimplificationPass(dfpm);
LLVMAddScalarizerPass(dfpm);
} else {
auto dfpm = default_function_pass_manager;
LLVMAddMemCpyOptPass(dfpm);
LLVMAddPromoteMemoryToRegisterPass(dfpm);
LLVMAddMergedLoadStoreMotionPass(dfpm);
LLVMAddAggressiveInstCombinerPass(dfpm);
LLVMAddConstantPropagationPass(dfpm);
LLVMAddAggressiveDCEPass(dfpm);
LLVMAddMergedLoadStoreMotionPass(dfpm);
LLVMAddPromoteMemoryToRegisterPass(dfpm);
LLVMAddCFGSimplificationPass(dfpm);
// LLVMAddInstructionCombiningPass(dfpm);
LLVMAddSLPVectorizePass(dfpm);
LLVMAddLoopVectorizePass(dfpm);
LLVMAddEarlyCSEPass(dfpm);
LLVMAddEarlyCSEMemSSAPass(dfpm);
LLVMAddScalarizerPass(dfpm);
LLVMAddLoopIdiomPass(dfpm);
// LLVMAddAggressiveInstCombinerPass(dfpm);
// LLVMAddLowerExpectIntrinsicPass(dfpm);
// LLVMAddPartiallyInlineLibCallsPass(dfpm);
// LLVMAddAlignmentFromAssumptionsPass(dfpm);
// LLVMAddDeadStoreEliminationPass(dfpm);
// LLVMAddReassociatePass(dfpm);
// LLVMAddAddDiscriminatorsPass(dfpm);
// LLVMAddPromoteMemoryToRegisterPass(dfpm);
// LLVMAddCorrelatedValuePropagationPass(dfpm);
// LLVMAddMemCpyOptPass(dfpm);
}
LLVMPassManagerRef default_function_pass_manager_without_memcpy = LLVMCreateFunctionPassManagerForModule(mod);
defer (LLVMDisposePassManager(default_function_pass_manager_without_memcpy));
{