Regression introduced by {rB042143440d76}. The deform group lookup was
performed on the wrong object. Before the lookup was performed on
the lattice object. This patch changes this back.
Reviewed By: Bastien Montagne
Differential Revision: https://developer.blender.org/D9638
Caused Victor.blend from the cloud to crash with ASan. Four floats are
fetched from the stack, but the buffer was only three wide.
Caused by 042143440d. Issue was probably harmless since the fourth
element wasn't actually touched.
This patch improves the single core performance of the lattice deform.
1. Prefetching deform vert during initialization. This data is constant for
each innerloop. This reduces the complexity of the inner loop what makes
more CPU resources free for other optimizations.
2. Prefetching the Lattice instance. It was constant. Although performance
wise this isn't noticeable it is always good to free some space in the
branch prediction tables.
3. Remove branching in all loops by not exiting when the effect of the loop
isn't there. The checks in the inner loops detected if this loop didn't
have any effect on the final result and then continue to the next loop.
This made the branch prediction unpredictable and a lot of mis
predictions were done. For smaller inner loops it is always better
to remove unpredictable if statements by using branchless code patterns.
4. Use SSE2 instruction when available.
This gives 50% performance increase measured on a
Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz with GCC 9.3.
Also check other compilers.
Before:
```
performance_no_dvert_10000 (4 ms)
performance_no_dvert_100000 (30 ms)
performance_no_dvert_1000000 (268 ms)
performance_no_dvert_10000000 (2637 ms)
```
After:
```
performance_no_dvert_10000 (3 ms)
performance_no_dvert_100000 (21 ms)
performance_no_dvert_1000000 (180 ms)
performance_no_dvert_10000000 (1756 ms)
```
Reviewed By: Campbell Barton
Differential Revision: https://developer.blender.org/D9087
- BKE_lattice_deform_data_create was init_latt_deform.
- BKE_lattice_deform_data_destroy was end_latt_deform.
- BKE_lattice_deform_data_eval_co was calc_latt_deform.
This is an improvement over 2.7x which converted edit-mesh to mesh
(CDDM) for all 3 modifiers.
Overall this increases performance in edit-mode by around 15-20%.
