[SPARC] Preparatory work for switch to LRA

[Eric Botcazou]

The switch will very likely not happen for GCC 7, but an experimental support 
can probably be introduced.  The attached patch adds the famous -mlra option 
and rescues straightforward changes by DaveM.

Tested on SPARC/Solaris, applied on the mainline.


2016-12-01  Eric Botcazou  <ebotcazou@adacore.com>
            David S. Miller  <davem@davemloft.net>

	* config/sparc/sparc.opt (mlra): New target option.
	* config/sparc/sparc.c (TARGET_LRA_P): Define to...
	(sparc_lra_p): ...this.  New function.
	(D_MODES, DF_MODES): Add missing cast.
	* config/sparc/sparc.md (*movsi_lo_sum, *movsi_high): Do not
	provide these insns when flag_pic.
	(sethi_di_medlow, losum_di_medlow, seth44, setm44, setl44, sethh,
	setlm, sethm, setlo, embmedany_sethi, embmedany_losum,
	embmedany_brsum, embmedany_textuhi, embmedany_texthi,
	embmedany_textulo, embmedany_textlo): Likewise.
	(sethi_di_medlow_embmedany_pic): Provide it only when flag_pic.

-- 
Eric Botcazou
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