Displaying 7 results from an estimated 7 matches for "shouldmergegep".
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shouldmergegeps
2015 Feb 24
2
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
...rote:
> ----- Original Message -----
> > From: "Francois Pichet" <pichet2000 at gmail.com>
> > To: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> > Sent: Sunday, February 22, 2015 5:34:11 PM
> > Subject: [LLVMdev] Question about shouldMergeGEPs in InstructionCombining
> >
> > Hello
> >
> > I am not sure I understand the logic for merging GEPs in
> > InstructionCombining.cpp:
> >
> > static bool shouldMergeGEPs (GEPOperator &GEP, GEPOperator &Src) {
> > // If this GEP has only 0 indi...
2015 Feb 22
2
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
Hello
I am not sure I understand the logic for merging GEPs in
InstructionCombining.cpp:
static bool shouldMergeGEPs(GEPOperator &GEP, GEPOperator &Src) {
// If this GEP has only 0 indices, it is the same pointer as
// Src. If Src is not a trivial GEP too, don't combine
// the indices.
if (GEP.hasAllZeroIndices() && !Src.hasAllZeroIndices() &&
!Src.hasOneUse())
retur...
2015 Feb 25
2
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
...t;
> To: "Francois Pichet" <pichet2000 at gmail.com>
> Cc: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>, "chandlerc" <chandlerc at gmail.com>
> Sent: Tuesday, February 24, 2015 11:27:43 PM
> Subject: Re: [LLVMdev] Question about shouldMergeGEPs in InstructionCombining
>
> w----- Original Message -----
> > From: "Francois Pichet" <pichet2000 at gmail.com>
> > To: "Hal Finkel" <hfinkel at anl.gov>
> > Cc: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> &g...
2015 Mar 12
3
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
I think it would make sense for (1) and (2). I am not sure if (3) is
feasible in instcombine. (I am not too familiar with LoopInfo)
For the Octasic's Opus platform, I modified shouldMergeGEPs in our fork to:
if (GEP.hasAllZeroIndices() && !Src.hasAllZeroIndices() &&
!Src.hasOneUse())
return false;
return Src.hasAllConstantIndices(); // was return false;
Following that change, I noticed some performance gain for a few specific
tests and no regression at...
2015 Mar 16
2
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
...lin at dberlin.org>, "Mark Heffernan" <meheff at google.com>, "Hal Finkel" <hfinkel at anl.gov>
> Cc: "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Sent: Friday, March 13, 2015 1:31:59 PM
> Subject: Re: [LLVMdev] Question about shouldMergeGEPs in InstructionCombining
>
>
> Hi Daniel,
>
> Thanks! I wonder if there's a way to reuse some code in
> Reassociation. Looks like most of the logic we want to implement is
> in Reassociate.cpp already. But the entire pass seems too expensive
> to run with CGP or after...
2015 Mar 12
2
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
....com>
> To: "Francois Pichet" <pichet2000 at gmail.com>
> Cc: "Hal Finkel" <hfinkel at anl.gov>, "LLVM Developers Mailing List" <llvmdev at cs.uiuc.edu>
> Sent: Thursday, March 12, 2015 4:19:56 PM
> Subject: Re: [LLVMdev] Question about shouldMergeGEPs in InstructionCombining
>
>
>
>
> On Thu, Mar 12, 2015 at 2:03 PM, Francois Pichet <
> pichet2000 at gmail.com > wrote:
>
>
>
>
> I think it would make sense for (1) and (2). I am not sure if (3) is
> feasible in instcombine . (I am not too familia...
2015 Mar 13
3
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
On Fri, Mar 13, 2015 at 10:16 AM Mark Heffernan <meheff at google.com> wrote:
> On Thu, Mar 12, 2015 at 2:34 PM, Hal Finkel <hfinkel at anl.gov> wrote:
>
>> It is not clear to me at all that preventing the merging is the right
>> solution. There are a large number of analysis, including alias analysis,
>> and optimizations that use GetUnderlyingObject, and