[PATCH] D8943: Calculate vectorization factor using the narrowest type instead of widest type

[Cong Hou via llvm-commits]

congh added a comment.

In http://reviews.llvm.org/D8943#252089, @hfinkel wrote:

> Have you run LLVM's test suite with this turned on? Are there any significant performance changes? [I'm happy for this to go in, given that it's disabled by default, even if there are regressions to fix, but I'd like to know where we stand].
>
> .


For all 498 test cases in the test suite, the average speed-up is 6.66% with this patch. There are several significant performance changes (>100%) and most are positive. I will keep investigating those significant negative changes.


http://reviews.llvm.org/D8943