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13141f04d3
PowerPC uses itineraries to describe processor pipelines (and dispatch-group restrictions for P7/P8 cores). Unfortunately, the target-independent implementation of TII.getInstrLatency calls ItinData->getStageLatency, and that looks for the largest cycle count in the pipeline for any given instruction. This, however, yields the wrong answer for the PPC itineraries, because we don't encode the full pipeline. Because the functional units are fully pipelined, we only model the initial stages (there are no relevant hazards in the later stages to model), and so the technique employed by getStageLatency does not really work. Instead, we should take the maximum output operand latency, and that's what PPCInstrInfo::getInstrLatency now does. This caused some test-case churn, including two unfortunate side effects. First, the new arrangement of copies we get from function parameters now sometimes blocks VSX FMA mutation (a FIXME has been added to the code and the test cases), and we have one significant test-suite regression: SingleSource/Benchmarks/BenchmarkGame/spectral-norm 56.4185% +/- 18.9398% In this benchmark we have a loop with a vectorized FP divide, and it with the new scheduling both divides end up in the same dispatch group (which in this case seems to cause a problem, although why is not exactly clear). The grouping structure is hard to predict from the bottom of the loop, and there may not be much we can do to fix this. Very few other test-suite performance effects were really significant, but almost all weakly favor this change. However, in light of the issues highlighted above, I've left the old behavior available via a command-line flag. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242188 91177308-0d34-0410-b5e6-96231b3b80d8
397 lines
22 KiB
TableGen
397 lines
22 KiB
TableGen
//===-- PPCScheduleP7.td - PPC P7 Scheduling Definitions ---*- tablegen -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the itinerary class data for the POWER7 processor.
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//
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//===----------------------------------------------------------------------===//
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// Primary reference:
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// IBM POWER7 multicore server processor
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// B. Sinharoy, et al.
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// IBM J. Res. & Dev. (55) 3. May/June 2011.
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// Scheduling for the P7 involves tracking two types of resources:
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// 1. The dispatch bundle slots
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// 2. The functional unit resources
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// Dispatch units:
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def P7_DU1 : FuncUnit;
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def P7_DU2 : FuncUnit;
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def P7_DU3 : FuncUnit;
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def P7_DU4 : FuncUnit;
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def P7_DU5 : FuncUnit;
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def P7_DU6 : FuncUnit;
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def P7_LS1 : FuncUnit; // Load/Store pipeline 1
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def P7_LS2 : FuncUnit; // Load/Store pipeline 2
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def P7_FX1 : FuncUnit; // FX pipeline 1
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def P7_FX2 : FuncUnit; // FX pipeline 2
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// VS pipeline 1 (vector integer ops. always here)
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def P7_VS1 : FuncUnit; // VS pipeline 1
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// VS pipeline 2 (128-bit stores and perms. here)
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def P7_VS2 : FuncUnit; // VS pipeline 2
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def P7_CRU : FuncUnit; // CR unit (CR logicals and move-from-SPRs)
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def P7_BRU : FuncUnit; // BR unit
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// Notes:
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// Each LSU pipeline can also execute FX add and logical instructions.
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// Each LSU pipeline can complete a load or store in one cycle.
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//
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// Each store is broken into two parts, AGEN goes to the LSU while a
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// "data steering" op. goes to the FXU or VSU.
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//
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// FX loads have a two cycle load-to-use latency (so one "bubble" cycle).
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// VSU loads have a three cycle load-to-use latency (so two "bubble" cycle).
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//
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// Frequent FX ops. take only one cycle and results can be used again in the
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// next cycle (there is a self-bypass). Getting results from the other FX
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// pipeline takes an additional cycle.
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//
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// The VSU XS is similar to the POWER6, but with a pipeline length of 2 cycles
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// (instead of 3 cycles on the POWER6). VSU XS handles vector FX-style ops.
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// Dispatch of an instruction to VS1 that uses four single prec. inputs
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// (either to a float or XC op). prevents dispatch in that cycle to VS2 of any
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// floating point instruction.
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//
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// The VSU PM is similar to the POWER6, but with a pipeline length of 3 cycles
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// (instead of 4 cycles on the POWER6). vsel is handled by the PM pipeline
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// (unlike on the POWER6).
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//
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// FMA from the VSUs can forward results in 6 cycles. VS1 XS and vector FP
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// share the same write-back, and have a 5-cycle latency difference, so the
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// IFU/IDU will not dispatch an XS instructon 5 cycles after a vector FP
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// op. has been dispatched to VS1.
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//
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// Three cycles after an L1 cache hit, a dependent VSU instruction can issue.
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//
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// Instruction dispatch groups have (at most) four non-branch instructions, and
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// two branches. Unlike on the POWER4/5, a branch does not automatically
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// end the dispatch group, but a second branch must be the last in the group.
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def P7Itineraries : ProcessorItineraries<
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[P7_DU1, P7_DU2, P7_DU3, P7_DU4, P7_DU5, P7_DU6,
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P7_LS1, P7_LS2, P7_FX1, P7_FX2, P7_VS1, P7_VS2, P7_CRU, P7_BRU], [], [
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InstrItinData<IIC_IntSimple , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2,
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P7_LS1, P7_LS2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_IntGeneral , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_IntISEL, [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_FX1, P7_FX2], 0>,
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InstrStage<1, [P7_BRU]>],
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[1, 1, 1, 1]>,
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InstrItinData<IIC_IntCompare , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1, 1]>,
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// FIXME: Add record-form itinerary data.
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InstrItinData<IIC_IntDivW , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<36, [P7_FX1, P7_FX2]>],
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[36, 1, 1]>,
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InstrItinData<IIC_IntDivD , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<68, [P7_FX1, P7_FX2]>],
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[68, 1, 1]>,
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InstrItinData<IIC_IntMulHW , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[4, 1, 1]>,
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InstrItinData<IIC_IntMulHWU , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[4, 1, 1]>,
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InstrItinData<IIC_IntMulLI , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[4, 1, 1]>,
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InstrItinData<IIC_IntRotate , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_IntRotateD , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_IntShift , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_IntTrapW , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1]>,
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InstrItinData<IIC_IntTrapD , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1]>,
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InstrItinData<IIC_BrB , [InstrStage<1, [P7_DU5, P7_DU6], 0>,
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InstrStage<1, [P7_BRU]>],
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[3, 1, 1]>,
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InstrItinData<IIC_BrCR , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_CRU]>],
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[3, 1, 1]>,
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InstrItinData<IIC_BrMCR , [InstrStage<1, [P7_DU5, P7_DU6], 0>,
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InstrStage<1, [P7_BRU]>],
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[3, 1, 1]>,
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InstrItinData<IIC_BrMCRX , [InstrStage<1, [P7_DU5, P7_DU6], 0>,
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InstrStage<1, [P7_BRU]>],
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[3, 1, 1]>,
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InstrItinData<IIC_LdStLoad , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[2, 1, 1]>,
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InstrItinData<IIC_LdStLoadUpd , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[2, 2, 1, 1]>,
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InstrItinData<IIC_LdStLoadUpdX, [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[3, 3, 1, 1]>,
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InstrItinData<IIC_LdStLD , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[2, 1, 1]>,
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InstrItinData<IIC_LdStLDU , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[2, 2, 1, 1]>,
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InstrItinData<IIC_LdStLDUX , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[3, 3, 1, 1]>,
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InstrItinData<IIC_LdStLFD , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[3, 1, 1]>,
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InstrItinData<IIC_LdStLVecX , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[3, 1, 1]>,
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InstrItinData<IIC_LdStLFDU , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[3, 3, 1, 1]>,
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InstrItinData<IIC_LdStLFDUX , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[3, 3, 1, 1]>,
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InstrItinData<IIC_LdStLHA , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[3, 1, 1]>,
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InstrItinData<IIC_LdStLHAU , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[4, 4, 1, 1]>,
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InstrItinData<IIC_LdStLHAUX , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[4, 4, 1, 1]>,
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InstrItinData<IIC_LdStLWA , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[3, 1, 1]>,
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InstrItinData<IIC_LdStLWARX, [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[3, 1, 1]>,
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InstrItinData<IIC_LdStLDARX, [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[3, 1, 1]>,
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InstrItinData<IIC_LdStLMW , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[2, 1, 1]>,
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InstrItinData<IIC_LdStStore , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_LdStSTD , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_LdStSTDU , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[2, 1, 1, 1]>,
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InstrItinData<IIC_LdStSTDUX , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2]>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[2, 1, 1, 1]>,
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InstrItinData<IIC_LdStSTFD , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_VS1, P7_VS2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_LdStSTFDU , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_FX1, P7_FX2], 0>,
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InstrStage<1, [P7_VS1, P7_VS2]>],
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[2, 1, 1, 1]>,
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InstrItinData<IIC_LdStSTVEBX , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2], 0>,
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InstrStage<1, [P7_VS2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_LdStSTDCX , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_LdStSTWCX , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_LS1, P7_LS2]>],
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[1, 1, 1]>,
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InstrItinData<IIC_BrMCRX , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_DU2], 0>,
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InstrStage<1, [P7_DU3], 0>,
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InstrStage<1, [P7_DU4], 0>,
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InstrStage<1, [P7_CRU]>,
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InstrStage<1, [P7_FX1, P7_FX2]>],
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[3, 1]>, // mtcr
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InstrItinData<IIC_SprMFCR , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_CRU]>],
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[6, 1]>,
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InstrItinData<IIC_SprMFCRF , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_CRU]>],
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[3, 1]>,
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InstrItinData<IIC_SprMTSPR , [InstrStage<1, [P7_DU1], 0>,
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InstrStage<1, [P7_FX1]>],
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[4, 1]>, // mtctr
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InstrItinData<IIC_FPGeneral , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_VS1, P7_VS2]>],
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[5, 1, 1]>,
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InstrItinData<IIC_FPAddSub , [InstrStage<1, [P7_DU1, P7_DU2,
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P7_DU3, P7_DU4], 0>,
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InstrStage<1, [P7_VS1, P7_VS2]>],
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[5, 1, 1]>,
|
|
InstrItinData<IIC_FPCompare , [InstrStage<1, [P7_DU1, P7_DU2,
|
|
P7_DU3, P7_DU4], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[8, 1, 1]>,
|
|
InstrItinData<IIC_FPDivD , [InstrStage<1, [P7_DU1, P7_DU2,
|
|
P7_DU3, P7_DU4], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[33, 1, 1]>,
|
|
InstrItinData<IIC_FPDivS , [InstrStage<1, [P7_DU1, P7_DU2,
|
|
P7_DU3, P7_DU4], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[27, 1, 1]>,
|
|
InstrItinData<IIC_FPSqrtD , [InstrStage<1, [P7_DU1, P7_DU2,
|
|
P7_DU3, P7_DU4], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[44, 1, 1]>,
|
|
InstrItinData<IIC_FPSqrtS , [InstrStage<1, [P7_DU1, P7_DU2,
|
|
P7_DU3, P7_DU4], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[32, 1, 1]>,
|
|
InstrItinData<IIC_FPFused , [InstrStage<1, [P7_DU1, P7_DU2,
|
|
P7_DU3, P7_DU4], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[5, 1, 1, 1]>,
|
|
InstrItinData<IIC_FPRes , [InstrStage<1, [P7_DU1, P7_DU2,
|
|
P7_DU3, P7_DU4], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[5, 1, 1]>,
|
|
InstrItinData<IIC_VecGeneral , [InstrStage<1, [P7_DU1], 0>,
|
|
InstrStage<1, [P7_VS1]>],
|
|
[2, 1, 1]>,
|
|
InstrItinData<IIC_VecVSL , [InstrStage<1, [P7_DU1], 0>,
|
|
InstrStage<1, [P7_VS1]>],
|
|
[2, 1, 1]>,
|
|
InstrItinData<IIC_VecVSR , [InstrStage<1, [P7_DU1], 0>,
|
|
InstrStage<1, [P7_VS1]>],
|
|
[2, 1, 1]>,
|
|
InstrItinData<IIC_VecFP , [InstrStage<1, [P7_DU1], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[6, 1, 1]>,
|
|
InstrItinData<IIC_VecFPCompare, [InstrStage<1, [P7_DU1], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[6, 1, 1]>,
|
|
InstrItinData<IIC_VecFPRound , [InstrStage<1, [P7_DU1], 0>,
|
|
InstrStage<1, [P7_VS1, P7_VS2]>],
|
|
[6, 1, 1]>,
|
|
InstrItinData<IIC_VecComplex , [InstrStage<1, [P7_DU1], 0>,
|
|
InstrStage<1, [P7_VS1]>],
|
|
[7, 1, 1]>,
|
|
InstrItinData<IIC_VecPerm , [InstrStage<1, [P7_DU1, P7_DU2], 0>,
|
|
InstrStage<1, [P7_VS2]>],
|
|
[3, 1, 1]>
|
|
]>;
|
|
|
|
// ===---------------------------------------------------------------------===//
|
|
// P7 machine model for scheduling and other instruction cost heuristics.
|
|
|
|
def P7Model : SchedMachineModel {
|
|
let IssueWidth = 6; // 4 (non-branch) instructions are dispatched per cycle.
|
|
// Note that the dispatch bundle size is 6 (including
|
|
// branches), but the total internal issue bandwidth per
|
|
// cycle (from all queues) is 8.
|
|
|
|
let MinLatency = 0; // Out-of-order dispatch.
|
|
let LoadLatency = 3; // Optimistic load latency assuming bypass.
|
|
// This is overriden by OperandCycles if the
|
|
// Itineraries are queried instead.
|
|
let MispredictPenalty = 16;
|
|
|
|
// Try to make sure we have at least 10 dispatch groups in a loop.
|
|
let LoopMicroOpBufferSize = 40;
|
|
|
|
let Itineraries = P7Itineraries;
|
|
}
|
|
|