LoongArch: genopts: Add infrastructure to generate code for new features in ISA evolution

LoongArch v1.10 introduced the concept of ISA evolution.  During ISA
evolution, many independent features can be added and enumerated via
CPUCFG.

Add a data file into genopts storing the CPUCFG word, bit, the name
of the command line option controlling if this feature should be used
for compilation, and the text description.  Make genstr.sh process these
info and add the command line options into loongarch.opt and
loongarch-str.h, and generate a new file loongarch-cpucfg-map.h for
mapping CPUCFG output to the corresponding option.  When handling
-march=native, use the information in loongarch-cpucfg-map.h to generate
the corresponding option mask.  Enable the features implied by -march
setting unless the user has explicitly disabled the feature.

The added options (-mdiv32 and -mld-seq-sa) are not really handled yet.
They'll be used in the following patches.

gcc/ChangeLog:

	* config/loongarch/genopts/isa-evolution.in: New data file.
	* config/loongarch/genopts/genstr.sh: Translate info in
	isa-evolution.in when generating loongarch-str.h, loongarch.opt,
	and loongarch-cpucfg-map.h.
	* config/loongarch/genopts/loongarch.opt.in (isa_evolution):
	New variable.
	* config/loongarch/t-loongarch: (loongarch-cpucfg-map.h): New
	rule.
	(loongarch-str.h): Depend on isa-evolution.in.
	(loongarch.opt): Depend on isa-evolution.in.
	(loongarch-cpu.o): Depend on loongarch-cpucfg-map.h.
	* config/loongarch/loongarch-str.h: Regenerate.
	* config/loongarch/loongarch-def.h (loongarch_isa):  Add field
	for evolution features.  Add helper function to enable features
	in this field.
	Probe native CPU capability and save the corresponding options
	into preset.
	* config/loongarch/loongarch-cpu.cc (fill_native_cpu_config):
	Probe native CPU capability and save the corresponding options
	into preset.
	(cache_cpucfg): Simplify with C++11-style for loop.
	(cpucfg_useful_idx, N_CPUCFG_WORDS): Move to ...
	* config/loongarch/loongarch.cc
	(loongarch_option_override_internal): Enable the ISA evolution
	feature options implied by -march and not explicitly disabled.
	(loongarch_asm_code_end): New function, print ISA information as
	comments in the assembly if -fverbose-asm.  It makes easier to
	debug things like -march=native.
	(TARGET_ASM_CODE_END): Define.
	* config/loongarch/loongarch.opt: Regenerate.
	* config/loongarch/loongarch-cpucfg-map.h: Generate.
	(cpucfg_useful_idx, N_CPUCFG_WORDS) ... here.

0 files changed, 0 insertions, 0 deletions