Hello,

generalizing a bit one transformation, to avoid a regression with another 
patch I am working on. Handling conversions always gets messy :-( It would 
have been easier to stick to scalars and wide_int, but since the existing 
transformation handles vectors, I didn't want to regress.

Bootstrap+testsuite on powerpc64le-unknown-linux-gnu.

2017-05-22  Marc Glisse  <marc.glisse@inria.fr>

gcc/
 	* match.pd ((A +- CST1) +- CST2): Allow some conversions.
 	* tree.c (drop_tree_overflow): Handle COMPLEX_CST and VECTOR_CST.

gcc/testsuite/
 	* gcc.dg/tree-ssa/addadd.c: New file.

-- 
Marc Glisse