> > I see. Provided a local is passed in a register to a > non-vararg function, it is still OK to align the stack. > > Given that we don't support 4 byte aligned stack at all with XMM > regisrers, I would prefer to increase Linux/x86 stack alignment to > 16 byte. People can use 4 byte alignment if they want. As for the > existing 4 byte aligned code, -mstackrealign can be used to support > them.
It would still be possible for the function to align its stack to 16 bytes, even though it can only assume it to be aligned at 4 bytes upon entry, if it needs it. Much like -mstackrealign, but paying its cost only in functions that will benefit from it. -- _______________________________________________________ Evandro Menezes AMD Austin, TX
