Hi!
On Thu, Mar 28, 2019 at 12:26:13PM -0500, William Tambe wrote:
> I am doing porting work and writing a backend using GCC 8.2.0.
>
> Despite the following #defines, the frame pointer is not getting
> eliminated; any idea why GCC would still generate a frame pointer ?
Do you use -fomit-frame-pointer (perhaps indirectly from -O, or from a
default)?
> #undef TARGET_FRAME_POINTER_REQUIRED
> #define TARGET_FRAME_POINTER_REQUIRED hook_bool_void_false
This is the default for this hook, you don't need this.
> #define ELIMINABLE_REGS \
> {{ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
> {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
> {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}}
Maybe you need to define HARD_FRAME_POINTER as well? Or is FRAME_POINTER
a hardware register for you?
Segher
