[PATCH/RFC] ARM -- Implement ATPCS stack alignment rules

[Jason R Thorpe]

...longjmp'ing back to an old thread...

On Mon, Sep 09, 2002 at 01:11:52PM +0100, Richard Earnshaw wrote:

 > You also need to test that -mthumb does not regress either, since you are 
 > making changes to the thumb code as well.

Sigh, where does the time go... anyway, my arm-elf sim test environment
now runs with and without -mthumb ... the patch shows no regressions.  A
run without TARGET_ATPCS passed, and a run with TARGET_ATPCS forced also
passed (run against a newlib, etc. which were compiled with the baseline
compiler).  A run with a newlib compiled with a forced-TARGET_ATPCS will
churn away overnight.

 > > + /* Calculate the size of the stack frame, taking into account any
 > > +    padding that is required to ensure stack-alignment.  */
 > > + 
 > > + HOST_WIDE_INT
 > > + arm_get_frame_size ()
 > > + {
 > > +   int regno;
 > 
 > This function needs to be rewritten to make use of 
 > arm_compute_save_reg_mask and arm_compute_save_reg0_reg12_mask.

Ok, let me make sure I understand this correctly; we want to simply
use the arm_compute_save_reg_mask return value to compute the saved-regs
space rather than computing that mask ourselves, but no other changes?

-- 
        -- Jason R. Thorpe <thorpej@wasabisystems.com>