Evan Cheng
b5a55d979c
- Teach SelectionDAG::isKnownNeverZero to return true (op x, c) when c is
...
non-zero.
- Teach X86 cmov optimization to eliminate the cmov from ctlz, cttz extension
when the source of X86ISD::BSR / X86ISD::BSF is proven to be non-zero.
rdar://9490949
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131948 91177308-0d34-0410-b5e6-96231b3b80d8
2011-05-24 01:48:22 +00:00
Chris Lattner
1db570df59
filecheckize a test and mark these wiht a cpu so it passes
...
on hosts without cmovs.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98521 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-14 22:31:16 +00:00
Dan Gohman
36a0947820
Eliminate more uses of llvm-as and llvm-dis.
...
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81290 91177308-0d34-0410-b5e6-96231b3b80d8
2009-09-08 23:54:48 +00:00
Evan Cheng
152804e9c1
Fix ctlz and cttz. llvm definition requires them to return number of bits in of the src type when value is zero.
...
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45029 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-14 08:30:15 +00:00
Evan Cheng
18efe269b1
Implement ctlz and cttz with bsr and bsf.
...
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45024 91177308-0d34-0410-b5e6-96231b3b80d8
2007-12-14 02:13:44 +00:00
