[PATCH] D42615: [X86] Generate BT instrutions a bit more agressively

Sat Jan 27 11:58:55 PST 2018

RKSimon added subscribers: avt77, RKSimon.
RKSimon added a comment.

In https://reviews.llvm.org/D42615#989870, @craig.topper wrote:

> BT has lower throughput than and/test and can't be macrofused. This probably isn't a win. See https://reviews.llvm.org/D37418 for some more discussion on this.

What might be of use is investigating whether this can be instead performed in the MC like @avt77 is trying to do for SHLD/SHRD on https://reviews.llvm.org/D40602.

Repository:
  rL LLVM

https://reviews.llvm.org/D42615