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2015 Feb 25
2
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
----- Original Message ----- > From: "Hal Finkel" <hfinkel at anl.gov> > 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
2015 Mar 12
3
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
...Mark Heffernan <meheff at google.com> wrote: > Coincidentally, I just ran into this same issue on some of our benchmarks > for the NVPTX backend. You have something like this before instcombine: > > %tmp = getelementptr inbounds i32, i32* %input, i64 %offset > loop: > %loop_variant = ... > %ptr = getelementptr inbounds i32, i32* %tmp, i64 %loop_variant > > Which gets transformed to: > > loop: > %loop_variant = ... > %sum = add nsw i64 %loop_variant, %offset > %ptr = getelementptr inbounds i32, i32* %input, i64 %sum > > The merge essent...
2015 Mar 12
2
[LLVMdev] Question about shouldMergeGEPs in InstructionCombining
...t; > wrote: > > > > Coincidentally, I just ran into this same issue on some of our > benchmarks for the NVPTX backend. You have something like this > before instcombine: > > > %tmp = getelementptr inbounds i32, i32* %input, i64 %offset > > loop: > > %loop_variant = ... > %ptr = getelementptr inbounds i32, i32* %tmp, i64 %loop_variant > > > Which gets transformed to: > > > > loop: > > %loop_variant = ... > %sum = add nsw i64 %loop_variant, %offset > > %ptr = getelementptr inbounds i32, i32* %input, i64 %sum &g...