Displaying 20 results from an estimated 2000 matches similar to: "[LLVMdev] getTripCount and pointers"
2009 Mar 08
1
[LLVMdev] getTripCount()
Hello,
I'm writing a new function pass, and I'm having trouble with
getTripCount() in Loop. If I generate the bitcode for the test code
with no optimization then getTripCount() returns NULL, but if I pass -
O3 to the front-end then getTripCount() returns fine. My phase calls
addRequiredID(LoopSimplifyID) from getAnalysisUsage() and I also tried
putting -mem2reg at the front
2009 Apr 02
2
[LLVMdev] Shuffle combine
Hi Stefanus,
Thanks for verifying this. Could you patch this or should I open a new bug
report and find a generic solution first?
Cheers,
Nicolas
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Stefanus Du Toit
Sent: woensdag 1 april 2009 18:59
To: LLVM Developers Mailing List
Subject: Re: [LLVMdev] Shuffle combine
On 1-Apr-09, at 12:42
2010 May 07
2
[LLVMdev] getTripCount requires which optimization passes?
Hi,
For me, getTripCount always returns null, even for trivial loops such
as:
void simple(int j) {
for (int i = 0; i < 10; i++) {
j++;
}
}
Looking through the mailing list archive, it appears that getTripCount
requires certain optimization passes to run first, but it's not clear
which ones. There doesn't seem to be any documentation on this. Does
anybody
2008 Nov 10
3
[LLVMdev] RapidMind/LLVM Announcement
For those curious about uses of LLVM, we just officially announced our
adoption of LLVM in our products:
http://www.rapidmind.com/News-Nov10-08-LLVM-OpenCL.php
Thanks for all the support so far on here, we look forward to
continuing to work with LLVM!
--
Stefanus Du Toit <stefanus.dutoit at rapidmind.com>
RapidMind Inc.
phone: +1 519 885 5455 x116 -- fax: +1 519 885 1463
2009 Apr 01
2
[LLVMdev] Shuffle combine
Hi Stefanus,
Thanks for the info. I still think it's a bug though. Take for example a
case where the vectors each have four elements. The values in Mask[] can
range from 0 to 7, while HLSMask only has 4 elements. So LHSMask[Mask[i]]
can go out of bounds, no?
Cheers,
Nicolas
From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at cs.uiuc.edu] On
Behalf Of Stefanus Du
2009 Apr 03
0
[LLVMdev] Shuffle combine
Hi Nicolas,
On 2-Apr-09, at 6:04 PM, Nicolas Capens wrote:
> Thanks for verifying this. Could you patch this or should I open a
> new bug report and find a generic solution first?
I don't have write access so the best I could do would be to submit a
patch, and I'm crazy busy at the moment.
I actually think the check I described below is fine and would fix
this bug (but
2009 Mar 12
2
[LLVMdev] List archives not updating
The llvm-dev archives (and other llvm/clang mailing list archives) on
the web don't seem to have any new messages since some time Monday
night.
Stefanus
--
Stefanus Du Toit <stefanus.dutoit at rapidmind.com>
RapidMind Inc.
phone: +1 519 885 5455 x116 -- fax: +1 519 885 1463
2009 Apr 01
0
[LLVMdev] Shuffle combine
On 1-Apr-09, at 12:42 PM, Nicolas Capens wrote:
> Hi Stefanus,
>
> Thanks for the info. I still think it’s a bug though. Take for
> example a case where the vectors each have four elements. The values
> in Mask[] can range from 0 to 7, while HLSMask only has 4 elements.
> So LHSMask[Mask[i]] can go out of bounds, no?
Good point! One easy way to fix this would be to use:
2008 Sep 30
1
[LLVMdev] LoopInfo getTripCount modification proposal
Hi,
I am trying to modify a loop by reducing the loop trip count from N to N-1
where N may be constant. I looked into using getTripCount[1] but discovered
that this method returns a Value* which is N itself. This prevents me from
using this method for changing the loop. I suggest creating another method
for returning the 'cmp' instruction. The new getTripCount implementation
will use the
2009 Jun 17
4
[LLVMdev] how do I run 'make check' on say just the 'test/CodeGen' directory ?
Does 'make check' allow just running on a particualar directory of tests ?
Many thanks in advance,
Aaron
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2009 Jan 30
2
[LLVMdev] Reassociating expressions involving GEPs
Hello,
We've run across the following missed optimization: in the attached
loop (addind.c/addind-opt.ll) there's a lookup into an array (V) using
an indirect index (coming from another array, WI[k]) offset by a loop-
invariant base (l). The full addressing expression can be reassociated
so that we add the offset l to V's base first, and then add the
indirect part. This makes
2009 Feb 02
2
[LLVMdev] OpenCL kernel to bitcode
Hi,
is there any possibility to compile OpenCL kernels into LLVM-bitcode?
Thanx,
Nico
2009 May 02
2
[LLVMdev] PointerIntPair causing trouble
On May 1, 2009, at 3:40 PM, Stefanus Du Toit wrote:
> Hi Nicolas,
>
> Looks like Preston and I have found the cause of the problem. The
> issue is with PointerLikeTypeTraits<T*>::NumLowBitsAvailable. This
> is set to 3, which basically assumes that unless the traits are
> specialized for a particular pointer type, objects of that type are
> allocated with
2008 Nov 10
0
[LLVMdev] RapidMind/LLVM Announcement
On Nov 10, 2008, at 12:01 PM, Stefanus Du Toit wrote:
> For those curious about uses of LLVM, we just officially announced our
> adoption of LLVM in our products:
>
> http://www.rapidmind.com/News-Nov10-08-LLVM-OpenCL.php
I'm thrilled to read an official announcement of that! Do you use
LLVM only for static code generation or are you also doing any late
(e.g.,
2009 Apr 01
2
[LLVMdev] Shuffle combine
Hi all,
I'm having some trouble understanding the following lines in
InstructionCombining.cpp, which possibly contain a bug:
if (Mask[i] >= 2*e)
NewMask.push_back(2*e);
else
NewMask.push_back(LHSMask[Mask[i]]);
When Mask[i] is bigger than the size of LHSMask it reads out of bounds on
that last line. I believe the first line is there to try to prevent that but
then it
2009 May 01
7
[LLVMdev] PointerIntPair causing trouble
Hi all,
I've located a regression that causes my project to crash. It's in revision
67979, where PointerIntPair is changed from storing the integer in the upper
bits instead of the lower bits. My project is an experimental JIT-compiler
in Windows.
So I was wondering if anyone had any clue why the new PointerIntPair
implementation might fail. It doesn't seem very safe to me to
2009 Feb 10
0
[LLVMdev] OpenCL kernel to bitcode
I don't think I ever saw a response to this message. RapidMind
reported that they are using OpenCL as well as LLVM but their press
release wasn't clear about whether they do this. I'd be interested in
hearing from Stefanus or anyone else there about how you use OpenCL
and whether it is compiled to LLVM.
--Vikram
Associate Professor, Computer Science
University of Illinois at
2010 May 07
0
[LLVMdev] getTripCount requires which optimization passes?
hi,
On Fri, May 7, 2010 at 8:59 AM, Trevor Harmon <Trevor.W.Harmon at nasa.gov>wrote:
> Hi,
>
> For me, getTripCount always returns null, even for trivial loops such
> as:
>
> void simple(int j) {
> for (int i = 0; i < 10; i++) {
> j++;
> }
> }
>
> Looking through the mailing list archive, it appears that getTripCount
> requires
2009 Jan 30
0
[LLVMdev] Reassociating expressions involving GEPs
On Fri, Jan 30, 2009 at 3:03 PM, Stefanus Du Toit
<stefanus.dutoit at rapidmind.com> wrote:
> The computation of %base then becomes loop-invariant and can be lifted out.
>
> What's the best way to add this optimization to LLVM?
Probably the best place is LICM itself... only loop transformations
are aware whether something is loop-invariant.
Although, I'm not completely
2008 Jul 31
0
[LLVMdev] Generating movq2dq using IRBuilder
On 31-Jul-08, at 2:38 PM, Dan Gohman wrote:
> On Jul 31, 2008, at 7:22 AM, Nicolas Capens wrote:
>> In the same breath I’d also like to kindly ask if someone could have
>> a look at the reverse operations, namely trunk from 128 to 64 bit
>> using movdq2q, and 128 to 32 and 64 to 32 using movd. This also
>> seems related to Bug 2585. Thanks again.
>
> The operations