range-op-float: Improve binary reverse operations

range-op-float: Improve binary reverse operations

On Mon, Dec 05, 2022 at 02:29:36PM +0100, Aldy Hernandez wrote:
> > So like this for multiplication op1/2_range if it passes bootstrap/regtest?
> > For division I'll need to go to a drawing board...
>
> Sure, looks good to me.

Ulrich just filed PR107972, so in the light of that PR the following patch
attempts to do that differently.

As for testcase, I've tried both attached testcases, but unfortunately it
seems that in neither of the cases we actually figure out that res range
is finite (or for last function non-zero ordered).  So there is further
work needed on that.

2022-12-06  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/107972
	* range-op-float.cc (frange_drop_infs): New function.
	(float_binary_op_range_finish): Add DIV_OP2 argument.  If DIV_OP2 is
	false and lhs is finite or if DIV_OP2 is true and lhs is non-zero and
	not NAN, r must be finite too.
	(foperator_div::op2_range): Pass true to DIV_OP2 of
	float_binary_op_range_finish.