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Use memmove if possible when emitting store over a certain size

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gingerBill
2022-06-30 15:42:02 +01:00
parent f60e8031f2
commit 4d06a54c0c
1 changed files with 20 additions and 0 deletions
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src/llvm_backend_general.cpp
+20
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@@ -852,6 +852,12 @@ bool lb_is_type_proc_recursive(Type *t) {
void lb_emit_store(lbProcedure *p, lbValue ptr, lbValue value) {
GB_ASSERT(value.value != nullptr);
Type *a = type_deref(ptr.type);
if (LLVMIsNull(value.value)) {
LLVMTypeRef src_t = LLVMGetElementType(LLVMTypeOf(ptr.value));
LLVMBuildStore(p->builder, LLVMConstNull(src_t), ptr.value);
return;
}
if (is_type_boolean(a)) {
// NOTE(bill): There are multiple sized booleans, thus force a conversion (if necessarily)
value = lb_emit_conv(p, value, a);
@@ -861,6 +867,20 @@ void lb_emit_store(lbProcedure *p, lbValue ptr, lbValue value) {
GB_ASSERT_MSG(are_types_identical(ca, core_type(value.type)), "%s != %s", type_to_string(a), type_to_string(value.type));
}
enum {MAX_STORE_SIZE = 32};
if (LLVMIsALoadInst(value.value) && lb_sizeof(LLVMTypeOf(value.value)) > 32) {
LLVMValueRef dst_ptr = ptr.value;
LLVMValueRef src_ptr = LLVMGetOperand(value.value, 0);
src_ptr = LLVMBuildPointerCast(p->builder, src_ptr, LLVMTypeOf(dst_ptr), "");
LLVMBuildMemMove(p->builder,
dst_ptr, 1,
src_ptr, 1,
LLVMConstInt(LLVMInt64TypeInContext(p->module->ctx), lb_sizeof(LLVMTypeOf(value.value)), false));
return;
}
if (lb_is_type_proc_recursive(a)) {
// NOTE(bill, 2020-11-11): Because of certain LLVM rules, a procedure value may be
// stored as regular pointer with no procedure information