* expr.c (store_expr): When converting expression to promoted

	* expr.c (store_expr): When converting expression to promoted
	equivalent type, allow using SUBREG_REG of TARGET as the target
	of the expansion of EXP.
	* loop.c (basic_induction_var, case SUBREG): Always look inside.
	* config/alpha/alpha.c (rtx_equiv_function_matters): Delete decl.
	(alpha_emit_set_const): Handle SImode when can't make new pseudos.
	(alpha_emit_set_const_1, alpha_sa_mask): Use no_new_pseudos.
	* config/alpha/alpha.md (addsi3, subsi3): Don't use if optimizing.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@49992 138bc75d-0d04-0410-961f-82ee72b054a4