[LLVMdev] Turning on/off instruction extensions

[Hal Finkel]

On Fri, 2011-12-02 at 19:08 +0100, Pablo Barrio wrote:
> I applied the patch to the trunk version successfully, although I get an error in between:
> 
> 1 out of 1 hunk FAILED -- saving rejects to file lib/Transforms/IPO/CMakeLists.txt.rej
> 
> Can I ignore the error? The patch exits normally except for that error.

The attached patch should apply cleanly.

Thanks for the feedback,
Hal

> 
> Also, I tried to apply the patch to the LLVM 3.0 but does not work at all. Is the trunk version the only one where the patch can be applied?
> 
> Thanks ahead,
> Pablo
> 
> On 29/11/2011, at 16:38, Hal Finkel wrote:
> 
> > On Tue, 2011-11-29 at 16:26 +0100, Pablo Barrio wrote:
> >> On 28/11/2011, at 18:52, Hal Finkel wrote:
> >> 
> >>> On Mon, 2011-11-28 at 17:49 +0100, Pablo Barrio wrote:
> >>>> How can I install the patch? Any step-by-step guide?
> >>> 
> >>> First, grab the trunk versions of llvm and clang. This is detailed on
> >>> http://clang.llvm.org/get_started.html
> >>> 
> >>> Then you apply the patch. On a Unix-like system, this is something like:
> >>> cd llvm
> >>> patch -p1 < /path/to/the-patch-file.diff
> >>> 
> >> 
> >> I tried to apply the patch to llvm 2.9 (not the trunk) but it shows a lot of "... hunk FAILED -- saving rejects to file ...". Is it safe to ignore these errors? Is it impossible to apply this patch to LLVM 2.9? Do you have a version of the patch compatible with 2.9?
> >> 
> > 
> > Unfortunately, I don't have a version for 2.9.
> > 
> > -Hal
> > 
> >> Right now I cannot switch to the trunk version.
> >> 
> >> Thanks in advance,
> >> Pablo
> >> 
> >>> Then you rebuild.
> >>> 
> >>> If you have any further questions, or need a more-detailed answer,
> >>> please let me know.
> >>> 
> >>> -Hal
> >>> 
> >>>> 
> >>>> Thanks,
> >>>> Pablo
> >>>> 
> >>>> On 24/11/2011, at 15:33, Hal Finkel wrote:
> >>>> 
> >>>>> On Thu, 2011-11-24 at 15:09 +0100, Pablo Barrio López-Cortijo wrote:
> >>>>>> Hi everybody,
> >>>>>> 
> >>>>>> I'm trying to run some examples with different backend options (turning
> >>>>>> on/off SSE, 3dnow, or MMX instructions). However, I don't see any
> >>>>>> difference in terms of execution time. Does anybody know which language
> >>>>>> constructs (in C/C++ preferably) should I try to make these instructions
> >>>>>> generated (and thus make a difference between a backend that enables
> >>>>>> them or not) ?
> >>>>>> 
> >>>>>> I tried generating vector instructions with loops but it's not
> >>>>>> happening. Perhaps Polly can generate vector instructions?
> >>>>> 
> >>>>> You can also try my basic-block autovectorization patch.
> >>>>> 
> >>>>> http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20111121/132206.html
> >>>>> 
> >>>>> After applying the patch (I recommend applying it to the current trunk),
> >>>>> then run clang with the flags:
> >>>>> -mllvm -vectorize -mllvm -unroll-allow-partial
> >>>>> (the -unroll-allow-partial is not necessary for the vectorization, but
> >>>>> tends to expose additional vectorization opportunities). The basic-block
> >>>>> vectorizer has a number of flags that can be used to customize its
> >>>>> behavior, so if it is not vectorizing something that you think it should
> >>>>> be (or is doing something performance detrimental), please let me know
> >>>>> and I'll be happy to help.
> >>>>> 
> >>>>> -Hal
> >>>>> 
> >>>>>> 
> >>>>>> Thanks ahead,
> >>>>>> 
> >>>>>> Pablo
> >>>>>> DIE-UPM
> >>>>>> Madrid
> >>>>>> 
> >>>>>> _______________________________________________
> >>>>>> LLVM Developers mailing list
> >>>>>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> >>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
> >>>>> 
> >>>>> -- 
> >>>>> Hal Finkel
> >>>>> Postdoctoral Appointee
> >>>>> Leadership Computing Facility
> >>>>> Argonne National Laboratory
> >>>>> 
> >>>> 
> >>> 
> >>> -- 
> >>> Hal Finkel
> >>> Postdoctoral Appointee
> >>> Leadership Computing Facility
> >>> Argonne National Laboratory
> >>> 
> >> 
> > 
> > -- 
> > Hal Finkel
> > Postdoctoral Appointee
> > Leadership Computing Facility
> > Argonne National Laboratory
> > 
> 

-- 
Hal Finkel
Postdoctoral Appointee
Leadership Computing Facility
Argonne National Laboratory
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