Hi, The lone power8 fate failing test seems like an aliasing issue. I've isolated it into the attached standalone test case. Compiling it with gcc -std=c11 -maltivec -mabi=altivec -mvsx -O3 -fno-tree-vectorize -o test test.c
reproduces on gcc 8.2.0, dropping the optimization level fixes it. This was one of the "adding a printf made it work" things too. -Wstrict-aliasing=1 complains about the "register int *idataptr = (int*)dataptr;" cast. If I put "typedef int __attribute__((may_alias)) int_alias;" at the top and change the cast and type to int_alias, the results become correct. This code would probably crash on systems where unaligned access is prohibited, I think the incoming block is just 16-bit aligned. How do you prefer to fix alignment/aliasing issues? - Lauri
test.c
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