https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104550
--- Comment #11 from qinzhao at gcc dot gnu.org --- (In reply to Jakub Jelinek from comment #10) > Even in that case, filling the memory with pattern & mask instead of filling > the memory with pattern + __builtin_clear_padding afterwards seems like a > win. So, you mean It's better to do the following for pattern init: 1. add call to .DEFERRED_INIT(, pattern, ) during gimplification; 2. during RTL expansion, fill the memory with pattern & mask if the variable is in memory. how to implement "fill the memory with pattern & mask" during RTL expansion? currently, we use memset to fill the memory when the variable is in memory, pattern & mask might not fit to a BYTE-repeatable pattern that can be used for memset?
