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4 Commits

Author SHA1 Message Date
Andrew Trick
dba95737e0 Remove redundant -enable-iv-rewrite=false flags from test cases. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153255 91177308-0d34-0410-b5e6-96231b3b80d8
 2012-03-22 17:09:04 +00:00
Lang Hames
68df750a4f Removed colons from some target datalayout strings in test, since they don't match the required format. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141825 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-10-12 22:24:17 +00:00
Andrew Trick
f21bdf4f42 Rename -disable-iv-rewrite to -enable-iv-rewrite=false in preparation for default change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139517 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-09-12 18:28:44 +00:00
Andrew Trick
06988bcf6a Made SCEV's UDiv expressions more canonical. When dividing a 
recurrence, the initial values low bits can sometimes be ignored.

To take advantage of this, added FoldIVUser to IndVarSimplify to fold
an IV operand into a udiv/lshr if the operator doesn't affect the
result.

-indvars -disable-iv-rewrite now transforms

i = phi i4
i1 = i0 + 1
idx = i1 >> (2 or more)
i4 = i + 4

into

i = phi i4
idx = i0 >> ...
i4 = i + 4


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137013 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-08-06 07:00:37 +00:00