* config/sparc/sparc.c (fp_sethi_p, fp_mov_p, fp_high_losum_p):
	New functions.
	* config/sparc/sparc-protos.h: Add them.
	* config/sparc/sparc.h: Add them to PREDICATE_CODES.
	(EXTRA_CONSTRAINT_BASE): New macro, handling Q, R, and S
	constraints which use those helpers.
	(EXTRA_CONSTRAINT): Use this new macro.
	* md.texi: Update sparc target constraints documentation.
	* config/sparc/sparc.md (clear_sf, clear_sfp, movsf_const_intreg,
	movsf_const_high, movsf_const_lo, movsf_insn): Delete.
	(movsf_insn_novis_liveg0, movsf_insn_novis_noliveg0,
	movsf_insn_vis, movsf_lo_sum, movsf_high): New patterns.
	(movsf high/lo_sum split): Rework for new patterns.
	(movsf expander): Allow storing fp_zero to memory if ! live_g0.

From-SVN: r30857