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3 Commits

Author SHA1 Message Date
Justin Lebar
9ff5ce49a6 [NVPTX] Fix function names in ctlz.ll test. Test-only change. 
Looks like a copy/paste mistake, all the functions in ctlz.ll were named
"ctpop".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292300 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-01-18 00:07:52 +00:00
Justin Lebar
fd46a6b819 [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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292299 91177308-0d34-0410-b5e6-96231b3b80d8
 2017-01-18 00:07:35 +00:00
Justin Holewinski
331ba2739d [NVPTX] Add support for cttz/ctlz/ctpop 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185176 91177308-0d34-0410-b5e6-96231b3b80d8
 2013-06-28 17:58:07 +00:00