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std.MultiArrayList: use @memset builtin for undefined

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Andrew Kelley 2021-02-05 15:45:33 -07:00
parent 0f3fa4d654
commit cf42ae178d
1 changed files with 7 additions and 1 deletions
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8
lib/std/multi_array_list.zig
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@ -180,9 +180,15 @@ pub fn MultiArrayList(comptime S: type) type {
capacityInBytes(new_len),
.exact,
) catch {
const self_slice = self.slice();
inline for (fields) |field_info, i| {
const field = @intToEnum(Field, i);
mem.set(field_info.field_type, self.slice().items(field)[new_len..], undefined);
const dest_slice = self_slice.items(field)[new_len..];
const byte_count = dest_slice.len * @sizeOf(field_info.field_type);
// We use memset here for more efficient codegen in safety-checked,
// valgrind-enabled builds. Otherwise the valgrind client request
// will be repeated for every element.
@memset(@ptrCast([*]u8, dest_slice.ptr), undefined, byte_count);
}
self.len = new_len;
return;