------- Additional Comments From gary at intrepid dot com 2005-02-17 22:39 -------
> I think that Bug #19566 is a real bug. The ABI specifies to pass 16byte > structs in registers. Anyway MAX_FIXED_MODE_SIZE doesn't influence > the calling convention ... Thanks for the clarification. After re-reading classify_argument() in config/i386/i386.c, I agree. I had thought that for all BLKmode values that it would target the argument into memory, however, for aggregate types (records/unions, etc) it ignores the mode and looks at each field (per the ABI). Thus, I agree this Bug #20020 is performance-related only, and Bug #19566 illustrates a variance from the procedure call ABI. -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20020
