re PR target/81572 (gcc-7 regression: unnecessary vector regmove on compare)

re PR target/81572 (gcc-7 regression: unnecessary vector regmove on compare)

2018-02-22  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/81572
	* lra-int.h (LRA_UNKNOWN_ALT, LRA_NON_CLOBBERED_ALT): New macros.
	* lra.c (lra_set_insn_recog_data, lra_update_insn_recog_data): Use
	LRA_UNKNOWN_ALT.
	* lra-constraints.c (curr_insn_transform): Set up
	LRA_NON_CLOBBERED_ALT for moves processed on the fast path.  Use
	LRA_UNKNOWN_ALT.
	(remove_inheritance_pseudos): Use LRA_UNKNOWN_ALT.
	* lra-eliminations.c (spill_pseudos): Ditto.
	(process_insn_for_elimination): Ditto.
	* lra-lives.c (reg_early_clobber_p): Use the new macros.
	* lra-spills.c (spill_pseudos): Use LRA_UNKNOWN_ALT and
	LRA_NON_CLOBBERED_ALT.

2018-02-22  Vladimir Makarov  <vmakarov@redhat.com>

	PR target/81572
	* gcc.target/powerpc/pr81572.c: New.

From-SVN: r257915