> On Feb 13, 2008 2:49 PM, Michael Matz <[EMAIL PROTECTED]> wrote: > > Hi, > > > > On Wed, 13 Feb 2008, H.J. Lu wrote: > > > > > Our proposal is at > > > > > > http://gcc.gnu.org/ml/gcc/2007-12/msg00567.html > > > > > > For most cases, we can align stack with RBP/RSP. But > > > we need an extra register when there is dynamic stack > > > allocation or nested functions. It has to be callee-saved > > > to work with setjmp/longjmp. > > > > I'm probably missing something, but why does it have to be a fixed > > register at all? Why not simply saying "a free callee-saved register"? > > > > We allocate this register when expanding prologue. Joey, Xuepeng, > will "a free callee-saved register" work here?
See code around ix86_select_alt_pic_regnum. You can play similar tricks. Honza > > H.J. > _______________________________________________ > discuss mailing list > [EMAIL PROTECTED] > https://www.x86-64.org/mailman/listinfo/discuss
