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4 Commits

Author SHA1 Message Date
Andrew Trick db149f9e73 Remove redundant -enable-iv-rewrite=false flags from test cases. 
llvm-svn: 153255
 2012-03-22 17:09:04 +00:00
Lang Hames 850f7b3cdc Removed colons from some target datalayout strings in test, since they don't match the required format. 
llvm-svn: 141825
 2011-10-12 22:24:17 +00:00
Andrew Trick 183013d8d4 Rename -disable-iv-rewrite to -enable-iv-rewrite=false in preparation for default change. 
llvm-svn: 139517
 2011-09-12 18:28:44 +00:00
Andrew Trick 6d45a01b67 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

llvm-svn: 137013
 2011-08-06 07:00:37 +00:00