On Thu, Jun 08, 2006 at 05:25:32PM -0500, Menezes, Evandro wrote: > > > 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. >
That is what icc does. It will be very nice if gcc can do that. H.J.
