Evan Cheng
b5950697e8
- 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
llvm-svn: 131948
2011-05-24 01:48:22 +00:00
Chris Lattner
8be174c089
filecheckize a test and mark these wiht a cpu so it passes
...
on hosts without cmovs.
llvm-svn: 98521
2010-03-14 22:31:16 +00:00
Dan Gohman
df2896d609
Eliminate more uses of llvm-as and llvm-dis.
...
llvm-svn: 81290
2009-09-08 23:54:48 +00:00
Evan Cheng
6909ff8c4b
Fix ctlz and cttz. llvm definition requires them to return number of bits in of the src type when value is zero.
...
llvm-svn: 45029
2007-12-14 08:30:15 +00:00
Evan Cheng
51cf86ded0
Implement ctlz and cttz with bsr and bsf.
...
llvm-svn: 45024
2007-12-14 02:13:44 +00:00
