Re: Problem with HARD_REGNO_CALL_PART_CLOBBERED: some changes

[Richard Henderson <rth at redhat dot com>]

On Wed, Mar 06, 2002 at 01:19:56PM +0100, Unruh, Erwin wrote:
> - take CPP 3.0.2 as base.

You'll need to take the 3.2 trunk as a base if you want a patch of
this nature to be applied.  It'll not go into the 3.0 or 3.1 branches.

> - looked at every use of call_used_regs / call_used_reg_set to decide
>   whether to check for partially clobbered regs.

I've slowly been getting rid of uses of call_used_regs, since one
has to use other checks simultaneously for correctness, which were
often forgotten.  I've been replacing them with uses of
regs_invalidated_by_call as I come across them.

I suggest that you add a

#ifdef HARD_REGNO_CALL_PART_CLOBBERED
#define regs_part_invalidated_by_call(MODE)  \
  ((void)(MODE), regs_invalidated_by_call)
#else
HARD_REG_SET x_regs_part_invalidated_by_call[NUM_MACHINE_MODES];
#define regs_part_invalidated_by_call(MODE)  \
  x_regs_part_invalidated_by_call[MODE]
#endif

Where x_regs_part_invalidated_by_call is computed like 
regs_invalidated_by_call except that it takes 
HARD_REGNO_CALL_PART_CLOBBERED to avoid clobbering registers
for appropriate modes.

Then replace uses of regs_invalidated_by_call with
regs_part_invalidated_by_call in the places that the
mode of the register is known.


r~