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use the sret attribute at the callsite when appropriate

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Thanks to Shawn Landden for the original pull request.

closes #1450
This commit is contained in:
Andrew Kelley 2018-09-02 21:08:59 -04:00
parent 8558caecb5
commit d5968086fe
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GPG Key ID: 4E7CD66038A4D47C
1 changed files with 9 additions and 1 deletions
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10
src/codegen.cpp
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@ -3101,6 +3101,12 @@ static void gen_set_stack_pointer(CodeGen *g, LLVMValueRef aligned_end_addr) {
LLVMBuildCall(g->builder, write_register_fn_val, params, 2, "");
}
static void set_call_instr_sret(CodeGen *g, LLVMValueRef call_instr) {
unsigned attr_kind_id = LLVMGetEnumAttributeKindForName("sret", 4);
LLVMAttributeRef sret_attr = LLVMCreateEnumAttribute(LLVMGetGlobalContext(), attr_kind_id, 1);
LLVMAddCallSiteAttribute(call_instr, 1, sret_attr);
}
static LLVMValueRef ir_render_call(CodeGen *g, IrExecutable *executable, IrInstructionCall *instruction) {
LLVMValueRef fn_val;
TypeTableEntry *fn_type;
@ -3196,6 +3202,7 @@ static LLVMValueRef ir_render_call(CodeGen *g, IrExecutable *executable, IrInstr
} else if (!ret_has_bits) {
return nullptr;
} else if (first_arg_ret) {
set_call_instr_sret(g, result);
return instruction->tmp_ptr;
} else if (handle_is_ptr(src_return_type)) {
auto store_instr = LLVMBuildStore(g->builder, result, instruction->tmp_ptr);
@ -4662,8 +4669,9 @@ static LLVMValueRef get_coro_alloc_helper_fn_val(CodeGen *g, LLVMTypeRef alloc_f
args.append(allocator_val);
args.append(coro_size);
args.append(alignment_val);
ZigLLVMBuildCall(g->builder, alloc_fn_val, args.items, args.length,
LLVMValueRef call_instruction = ZigLLVMBuildCall(g->builder, alloc_fn_val, args.items, args.length,
get_llvm_cc(g, CallingConventionUnspecified), ZigLLVM_FnInlineAuto, "");
set_call_instr_sret(g, call_instruction);
LLVMValueRef err_val_ptr = LLVMBuildStructGEP(g->builder, sret_ptr, err_union_err_index, "");
LLVMValueRef err_val = LLVMBuildLoad(g->builder, err_val_ptr, "");
LLVMBuildStore(g->builder, err_val, err_code_ptr);