[Bug target/105075] [nvptx] Generate sad insn (sum of absolute differences)

[vries at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105075

--- Comment #6 from Tom de Vries <vries at gcc dot gnu.org> ---
Created attachment 52698
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=52698&action=edit
Demonstrator patch with stepping stone patterns for combine

(In reply to Tom de Vries from comment #2)
> Also, I wonder if defining a stepping-stone intermediate pattern could help
> combine.

Well, that approach seems to work.