Tests showed that it helps to eliminates redundant 32-to-64-bit extensions.

Tested on SPARC/Solaris, applied on the mainline.


2016-11-24  Eric Botcazou  <ebotcazou@adacore.com>

	* common/config/sparc/sparc-common.c (option_optimization_table):
	Enable REE at -O2 and higher.
	* config/sparc/sparc.c (sparc_option_override): Disable it by default
	in 32-bit mode.

-- 
Eric Botcazou