re PR target/17390 (missing floating point compare optimization)

re PR target/17390 (missing floating point compare optimization)

	PR target/17390
	* config/i386/i386.c (ix86_expand_fp_compare): Expand fp comparison to
	fake fcomi i387 instruction for !TARGET_CMOVE.
	(ix86_expand_branch): Expand natural sequence with one jump for
	all targets, not only TARGET_CMOVE.
	* config/i386/i386.md (*cmpfp_0_cc): New define_insn_and_split
	pattern to implement fake fcomi sequence.  Split instruction after
	reload to correct compare sequences.
	(*cmpfp_xf_cc): Ditto.
	(*cmpfp_<mode>_cc): Ditto.
	(*cmpfp_u_cc): Ditto.
	(*cmpfp_<mode>_cc): Ditto.

testsuite/ChangeLog:

	PR target/17390
	* gcc.target/i386/pr17390.c: New test.

From-SVN: r127742