2017-04-25  Marc Glisse  <marc.glisse@inria.fr>

gcc/
	* fold-const.c (tree_single_nonzero_warnv_p): Handle SSA_NAME.

gcc/testsuite/
	* gcc.dg/tree-ssa/cmpmul-1.c: New file.
	* gcc.dg/Wstrict-overflow-18.c: Xfail.

From-SVN: r247123