commit ebb300d0b4340104dcade3afa656a57da2b7660c
author Antonio Sanchez <cantonios@google.com> Sun May 23 12:35:38 2021 -0700
committer Antonio Sanchez <cantonios@google.com> Sun May 23 12:44:37 2021 -0700
tree cf8ddfa15495969e31ff04141cb112bb30fced6f
parent 12471fcb5d59f969c60a9b78727624dc91e5c04e

Modify Unary/Binary/TernaryOp evaluators to work for non-class types.

This used to work for non-class types (e.g. raw function pointers) in
Eigen 3.3.  This was changed in commit 11f55b29 to optimize the
evaluator:

> `sizeof((A-B).cwiseAbs2())` with A,B Vector4f is now 16 bytes, instead of 48 before this optimization.

though I cannot reproduce the 16 byte result.  Both before the change
and after, with multiple compilers/versions, I always get a result of 40 bytes.

https://godbolt.org/z/MsjTc1PGe

This change modifies the code slightly to allow non-class types.  The
final generated code is identical, and the expression remains 40 bytes
for the `abs2` sample case.

Fixes #2251