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? H.J.
