dist/gcc/reg-stack.c

893       rtx i1src = *get_true_reg (&SET_SRC (i1set));
900 	  && REG_P (i1src)
901 	  && REGNO (i1src) == (unsigned) hard_regno - 1
909 	  && REG_P (i1src) && REGNO (i1src) == FIRST_STACK_REG
923       i1src = SET_SRC (i1set);
924       if (GET_CODE (i1src) == FLOAT_EXTEND)
925 	i1src = XEXP (i1src, 0);
928 	  && (MEM_P (i1src) || GET_CODE (i1src) == CONST_DOUBLE)
929 	  && !side_effects_p (i1src)