2018-11-08  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/87913
	* tree-ssa-phiopt.c (minmax_replacement): Turn EQ/NE compares
	of extreme values to ordered comparisons.

	* gcc.dg/tree-ssa/phi-opt-20.c: New testcase.

From-SVN: r265909