[llvm-commits] [llvm] r164173 - in /llvm/trunk: include/llvm/Transforms/Utils/IntegerDivision.h lib/Transforms/Utils/CMakeLists.txt lib/Transforms/Utils/IntegerDivision.cpp

[Joerg Sonnenberger]

On Tue, Sep 18, 2012 at 08:27:30PM -0700, Evan Cheng wrote:
> 
> On Sep 18, 2012, at 6:48 PM, Eli Friedman <eli.friedman at gmail.com> wrote:
> 
> > On Tue, Sep 18, 2012 at 5:42 PM, Evan Cheng <evan.cheng at apple.com> wrote:
> >>> There are a lot of missed optimization opportunities here, e.g.
> >>> dividing by a constant; have you considered anything in this area?
> >> 
> >> Instcombine etc. should have optimized a lot of cases. This is intended to expand the cases that survived optimization.
> > 
> > Instcombine won't touch, e.g. x/3, and there are substantially faster
> > ways to perform that operation.
> 
> Are those cases generic or target specific?

Completely generic. LLVM has code for that already.

Joerg