Add support for -mvector-size-32.

Add support for -mvector-size-32.

2023-11-09  Michael Meissner  <meissner@linux.ibm.com>

gcc/

	* config/rs6000/predicates.md (const_0_to_31_operand): New predicate.
	* config/rs6000/rs6000-c.cc (rs6000_cpu_cpp_builtins): Define
	__VECTOR_SIZE_32__ if -mvector-size-32 was used.
	* config/rs6000/rs6000-cpus.def (OTHER_POWER10_MASKS): Add
	-mvector-size-32.
	(POWERPC_MASKS): Likewise.
	* config/rs6000/rs6000-protos.h (vector_pair_to_vector_mode): New
	declaration.
	(rs6000_adjust_for_vector_pair): Likewise.
	(split_unary_vector_pair): Likewise.
	(split_binary_vector_pair): Likewise.
	(split_fma_vector_pair): Likewise.
	* config/rs6000/rs6000.cc (rs6000_hard_regno_mode_ok_uncached): Add
	support for 32-byte vector types created with -mvector-size-32.
	(rs6000_modes_tieable_p): Make all 32-byte vectors tie with other
	32-byte vectors.
	(rs6000_debug_reg_global): If -mdebug=reg, print whether
	-mvector-size-32 was enabled.
	(rs6000_init_hard_regno_mode_ok): Add support for 32-byte vectors.
	(rs6000_option_override_internal): Add checking for -mvector-size-32.
	(rs6000_opt_masks): Add -mvector-size-32.
	(rs6000_expand_vector_extract): Add support for 32-byte vectors.
	(reg_offset_addressing_ok_p): Likewise.
	(rs6000_emit_move): Likewise.
	(rs6000_preferred_reload_class): Likewise.
	(vector_pair_to_vector_mode): New vector pair helper function.
	(rs6000_adjust_for_vector_pair): Likewise.
	(rs6000_split_vpair_constan): Likewise.
	(split_unary_vector_pair): Likewise.
	(split_binary_vector_pair): Likewise.
	(split_fma_vector_pair): Likewise.
	(rs6000_split_multireg_move): Add support for 32-byte vectors.
	* config/rs6000/rs6000.h (VECTOR_PAIR_MODE): New macro.
	* config/rs6000/rs6000.md (wd attribute): Add 32-byte vector modes.
	(RELOAD): Likewise.
	(toplevel): Include vector-pair.md.
	* config/rs6000/rs6000.opt (-mvector-size-32): New option.
	* config/rs6000/t-rs6000 (MD_INCLUDES): Add vector-pair.md.
	* config/rs6000/vector-pair.md: New file.
	* config/rs6000/vector.md (VEC_base): Add 32-byte vector modes.
	* config/rs6000/vsx.md (VSX_EXTRACT_PREDICATE): Likewise.
	(VSX_EX): Likewise.
	(VPAIR_V4DI_V4DF): New mode iterator.
	(VPAIR_VECTOR): New mode attribute.
	(vpair_vector): Likewise.
	(vsx_extract_<mode>, VPAIR_V4DF_V4DI iterator): New extract insn for
	vector pair support.
	(vsx_extract_v8sf): Likewise.
	(vsx_extract_<mode>, VPAIR_SMALL_INT iterator): Likewise.

gcc/testsuite/

	* gcc.target/powerpc/vector-size-32-1.c: New test.
	* gcc.target/powerpc/vector-size-32-2.c: New test.
	* gcc.target/powerpc/vector-size-32-3.c: New test.
	* gcc.target/powerpc/vector-size-32-4.c: New test.
	* gcc.target/powerpc/vector-size-32-5.c: New test.
	* gcc.target/powerpc/vector-size-32-6.c: New test.