[PATCH] D42615: [X86] Generate BT instrutions a bit more agressively
Simon Pilgrim via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
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
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