This PR was fixed earlier with a patch that was deemed safe for GCC 6
through the removal of splitters for zero extend and sign extend to
HImode.
Now that trunk has opened for GCC 7 development, the following patch
restores the splitters and fixes the bug in the more aggressive manner
originally p
Anton reported a latent bug in the rs6000 port discovered with csmith.
Splitters for extendqihi2 and zero_extendqihi2 can generate invalid
compare RTL. PowerPC can load and store bytes or halfwords, but
computations operate on registers. Currently the extend patterns
exist for HImode, although no
