hppa: Add peephole2 optimizations for REG+D loads and stores

hppa: Add peephole2 optimizations for REG+D loads and stores

The PA 1.x architecture only supports long displacements in
integer loads and stores.  Floating-point loads and stores
only support short displacements.  As a result, we have to
wait until reload is complete before generating insns with
long displacements.

The PA 2.0 architecture supports long displacements in both
integer and floating-point loads and stores.

The peephole2 optimizations added in this change are only
enabled when 14-bit long displacements aren't supported for
floating-point loads and stores.

2024-09-18  John David Anglin  <danglin@gcc.gnu.org>

gcc/ChangeLog:

	* config/pa/pa.h (GENERAL_REGNO_P): Define.
	* config/pa/pa.md: Add SImode and SFmode peephole2
	patterns to generate loads and stores with long
	displacements.