[PATCH] D35320: [X86][SSE] Add support for extending bool vectors bitcasted from scalars.

[Elena Demikhovsky via Phabricator via llvm-commits]

delena added a comment.

I'm thinking about another algorithm:
let's assume that we have sext (bitcast i8 to 8 x i1) to <8 x i16>

I can do the following:

1. broadcast i8 over the xmm
2. "pand" with vector-mask (1, 2, 4, 8, 16 ..)
3. compare with zeroinitializer

If we have "zext" instead of "sext", we can put an additional shift-right at the end.


Repository:
  rL LLVM

https://reviews.llvm.org/D35320