[LLVMdev] -indvars issues?

[Andrew Trick]

On Jun 18, 2013, at 6:08 AM, eric.lew <eirc.lew at gmail.com> wrote:

> It seems there is no -enable-iv-rewrite now in llvm3.2,  and it suggest
> -enable-load-pre, but it still does not work.
> 
> So, how to active the transform?

Eric,

Loops are canonicalized with -loop-rotate, which implicitly calls -loop-simplify first.

The canonical form of the induction variables is expressed in the ScalarEvolution analysis.

-indvars simplifies inductions variables, mainly by eliminating sign extension, but does not rewrite them into a canonical form.

-Andy
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