[Bug middle-end/66741] loops not fused nor vectorized

[aldot at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66741

--- Comment #6 from Bernhard Reutner-Fischer <aldot at gcc dot gnu.org> ---
Created attachment 35942
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35942&action=edit
Variant demonstrating strcpy+tolower fused loop, vectorized, SSE4.x

Code like this should be emitted for such strcpy+tolower "patterns" (on
SSE4.x), like for the motivating -1.c