[llvm] r206957 - [X86] Silvermont new scheduler model

[Alexey Volkov]

Yes, this is an intentional change.
According to Intel optimization reference manual FP addition on Silvermont
happens only on port 1 (FPC_RSV1).


2014-04-29 20:58 GMT+04:00 Hal Finkel <hfinkel at anl.gov>:

> ----- Original Message -----
> > From: "Alexey Volkov" <avolkov.intel at gmail.com>
> > To: llvm-commits at cs.uiuc.edu
> > Sent: Wednesday, April 23, 2014 3:57:10 AM
> > Subject: [llvm] r206957 - [X86] Silvermont new scheduler model
> >
> > Author: volkalex
> > Date: Wed Apr 23 03:57:09 2014
> > New Revision: 206957
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=206957&view=rev
> > Log:
> > [X86] Silvermont new scheduler model
> > This model is not final and work is still in progress.
> > However there are substantial improvements on integer tests mainly
> > because of better RAL with new scheduler.
> >
> > Differential Revision: http://reviews.llvm.org/D3451
> >
> > Modified:
> >     llvm/trunk/lib/Target/X86/X86ScheduleSLM.td
> >
> > Modified: llvm/trunk/lib/Target/X86/X86ScheduleSLM.td
> > URL:
> >
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ScheduleSLM.td?rev=206957&r1=206956&r2=206957&view=diff
> >
> ==============================================================================
> > --- llvm/trunk/lib/Target/X86/X86ScheduleSLM.td (original)
> > +++ llvm/trunk/lib/Target/X86/X86ScheduleSLM.td Wed Apr 23 03:57:09
> > 2014
> > @@ -1,4 +1,4 @@
>
> [snip]
>
> > +// Scalar and vector floating point.
> > +defm : SMWriteResPair<WriteFAdd,   FPC_RSV1, 3>;
>
> [snip]
>
> > -
> > -  // SSE binary operations
> > -  // arithmetic fp scalar
> > -  InstrItinData<IIC_SSE_ALU_F32S_RR, [InstrStage<3, [FPC_RSV0,
> > FPC_RSV1]>] >,
>
> [snip]
>
> Is this an intentional model change? It looks like previously
> floating-point addition could happen in both FPC_RSV0 or FPC_RSV1, but now
> it happens only in FPC_RSV1?
>
>  -Hal
>
> >
> >
> > _______________________________________________
> > llvm-commits mailing list
> > llvm-commits at cs.uiuc.edu
> > http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits
> >
>
> --
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
>



-- 
Alexey Volkov
Intel Corporation
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