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Author SHA1 Message Date
Justin Lebar d17de5380b [NVPTX] Improve lowering of llvm.ctlz. 
Summary:
* Disable "ctlz speculation", which inserts a branch on every ctlz(x) which
  has defined behavior on x == 0 to check whether x is, in fact zero.

* Add DAG patterns that avoid re-truncating or re-expanding the result
  of the 16- and 64-bit ctz instructions.

Reviewers: tra

Subscribers: llvm-commits, jholewinski

Differential Revision: https://reviews.llvm.org/D28719

llvm-svn: 292299
 2017-01-18 00:07:35 +00:00
Justin Holewinski dc372df63b [NVPTX] Add support for cttz/ctlz/ctpop 
llvm-svn: 185176
 2013-06-28 17:58:07 +00:00