tree de9646a1247bbd06f363d32b259e64d6987a130e
parent ba87381eff4539ad6fc7e7c958c01007c26eec78
author David Gross <dgross@google.com> 1460144141 -0700
committer David Gross <dgross@google.com> 1461017174 -0700

If a general reduction kernel lacks a combiner function, synthesize one.

The CPU reference driver can only go multithreaded for a reduction kernel
if that kernel has a combiner function.

Bug: 27299475

Change-Id: If7f3a9ba8ec5e15ed5f3ef96968d28d650b01c20
(cherry picked from commit 57fd9f882f3359be4201c42b02aebf785d311df2)