On Thu, Jul 30, 2015 at 8:41 PM, H.J. Lu <hongjiu...@intel.com> wrote: > On Tue, Jul 21, 2015 at 02:45:39PM -0700, H.J. Lu wrote: >> When __builtin_frame_address is used to retrieve the address of the >> function stack frame, the frame pointer is always kept, which wastes one >> register and 2 instructions. For x86-32, one less register means >> significant negative impact on performance. This patch adds a new >> builtin function, __builtin_ia32_stack_top, to x86 backend. It >> returns the stack address when the function is called. >> >> Any comments, feedbacks? >> > > Although this function is generic, but implementation is target > specific. I submitted a generic patch: > > https://gcc.gnu.org/ml/gcc-patches/2015-07/msg01859.html > > So far there are no interests from other backends. Here is a patch > to implement __builtin_stack_top in x86 backend. We can update x86 > backedn after it is added to middle-end. OK for trunk?
I think that the discussion about generic implementation should come to some conclusion first. From the discussion, here was no resolution on which way to go. Uros.
