On Thu, Jan 29, 2015 at 11:20 PM, Tom de Vries <tom_devr...@mentor.com> wrote: > On 29-01-15 18:25, Jakub Jelinek wrote: >> >> The stdarg pass can't grok too heavy optimizations, so if at all possible, >> don't schedule such passes early, and if you for some reason do, avoid >> optimizing in there the va_list related accesses. > > > This patch work for the example. > > In pass_lim1, I get: > ... > ;; Function gen_rtvec (gen_rtvec, funcdef_no=1, decl_uid=1841, cgraph_uid=1, > symbol_order=1) > > va_list_related_stmt_p: no simple_mem_ref > _15 = p.gp_offset; > va_list_related_stmt_p: no simple_mem_ref > _16 = p.reg_save_area; > va_list_related_stmt_p: no simple_mem_ref > p.gp_offset = _21; > va_list_related_stmt_p: no simple_mem_ref > _23 = p.overflow_arg_area; > va_list_related_stmt_p: no simple_mem_ref > p.overflow_arg_area = _25; > va_list_related_stmt_p: MOVE_IMPOSSIBLE > _15 = p.gp_offset; > va_list_related_stmt_p: MOVE_IMPOSSIBLE > _16 = p.reg_save_area; > va_list_related_stmt_p: MOVE_IMPOSSIBLE > _23 = p.overflow_arg_area; > gen_rtvec (int n) > ...
I don't like adding more hacks to aid the stdarg pass. It's not required for GCC 5 anyway and for GCC 6 we should push the lowering change. Maybe you want to pick up the work? Thanks, Richard. > Thanks, > - Tom
