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Force memset instead of store zeroinitializer when the value is large

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This commit is contained in:
gingerBill
2022-07-24 20:22:50 +01:00
parent c8ab1b7ee1
commit e6ab4f4856
4 changed files with 19 additions and 8 deletions
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src/llvm_backend_general.cpp
+9 -3
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@@ -855,7 +855,11 @@ void lb_emit_store(lbProcedure *p, lbValue ptr, lbValue value) {
if (LLVMIsNull(value.value)) {
LLVMTypeRef src_t = LLVMGetElementType(LLVMTypeOf(ptr.value));
LLVMBuildStore(p->builder, LLVMConstNull(src_t), ptr.value);
if (lb_sizeof(src_t) <= lb_max_zero_init_size()) {
LLVMBuildStore(p->builder, LLVMConstNull(src_t), ptr.value);
} else {
lb_mem_zero_ptr(p, ptr.value, a, LLVMGetAlignment(ptr.value));
}
return;
}
if (is_type_boolean(a)) {
@@ -2737,13 +2741,15 @@ lbAddr lb_add_local(lbProcedure *p, Type *type, Entity *e, bool zero_init, i32 p
if (!zero_init && !force_no_init) {
// If there is any padding of any kind, just zero init regardless of zero_init parameter
LLVMTypeKind kind = LLVMGetTypeKind(llvm_type);
if (kind == LLVMArrayTypeKind) {
kind = LLVMGetTypeKind(lb_type(p->module, core_array_type(type)));
}
if (kind == LLVMStructTypeKind) {
i64 sz = type_size_of(type);
if (type_size_of_struct_pretend_is_packed(type) != sz) {
zero_init = true;
}
} else if (kind == LLVMArrayTypeKind) {
zero_init = true;
}
}