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2 Commits

Author SHA1 Message Date
Andrew Trick
09cf4287c2 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
a7fc7983d4 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