| //==- ARMScheduleM4.td - Cortex-M4 Scheduling Definitions -*- tablegen -*-====// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file defines the SchedRead/Write data for the ARM Cortex-M4 processor. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| def CortexM4Model : SchedMachineModel { |
| let IssueWidth = 1; // Only IT can be dual-issued, so assume single-issue |
| let MicroOpBufferSize = 0; // In-order |
| let LoadLatency = 2; // Latency when not pipelined, not pc-relative |
| let MispredictPenalty = 2; // Best case branch taken cost |
| let PostRAScheduler = 1; |
| |
| let CompleteModel = 0; |
| let UnsupportedFeatures = [IsARM, HasNEON, HasDotProd, HasZCZ, HasMVEInt, |
| IsNotMClass, HasDPVFP, HasFPARMv8, HasFullFP16, Has8MSecExt, HasV8, |
| HasV8_3a, HasTrustZone, HasDFB, IsWindows]; |
| } |
| |
| |
| // We model the entire cpu as a single pipeline with a BufferSize = 0 since |
| // Cortex-M4 is in-order. |
| |
| def M4Unit : ProcResource<1> { let BufferSize = 0; } |
| |
| |
| let SchedModel = CortexM4Model in { |
| |
| // Some definitions of latencies we apply to different instructions |
| |
| class M4UnitL1<SchedWrite write> : WriteRes<write, [M4Unit]> { let Latency = 1; } |
| class M4UnitL2<SchedWrite write> : WriteRes<write, [M4Unit]> { let Latency = 2; } |
| class M4UnitL3<SchedWrite write> : WriteRes<write, [M4Unit]> { let Latency = 3; } |
| class M4UnitL14<SchedWrite write> : WriteRes<write, [M4Unit]> { let Latency = 14; } |
| def M4UnitL1_wr : SchedWriteRes<[M4Unit]> { let Latency = 1; } |
| def M4UnitL2_wr : SchedWriteRes<[M4Unit]> { let Latency = 2; } |
| class M4UnitL1I<dag instr> : InstRW<[M4UnitL1_wr], instr>; |
| class M4UnitL2I<dag instr> : InstRW<[M4UnitL2_wr], instr>; |
| |
| |
| // Loads, MAC's and DIV all get a higher latency of 2 |
| def : M4UnitL2<WriteLd>; |
| def : M4UnitL2<WriteMAC32>; |
| def : M4UnitL2<WriteMAC64Hi>; |
| def : M4UnitL2<WriteMAC64Lo>; |
| def : M4UnitL2<WriteMAC16>; |
| def : M4UnitL2<WriteDIV>; |
| |
| def : M4UnitL2I<(instregex "(t|t2)LDM")>; |
| def : M4UnitL2I<(instregex "(t|t2)LDR")>; |
| |
| |
| // Stores we use a latency of 1 as they have no outputs |
| |
| def : M4UnitL1<WriteST>; |
| def : M4UnitL1I<(instregex "(t|t2)STM")>; |
| |
| |
| // Everything else has a Latency of 1 |
| |
| def : M4UnitL1<WriteALU>; |
| def : M4UnitL1<WriteALUsi>; |
| def : M4UnitL1<WriteALUsr>; |
| def : M4UnitL1<WriteALUSsr>; |
| def : M4UnitL1<WriteBr>; |
| def : M4UnitL1<WriteBrL>; |
| def : M4UnitL1<WriteBrTbl>; |
| def : M4UnitL1<WriteCMPsi>; |
| def : M4UnitL1<WriteCMPsr>; |
| def : M4UnitL1<WriteCMP>; |
| def : M4UnitL1<WriteMUL32>; |
| def : M4UnitL1<WriteMUL64Hi>; |
| def : M4UnitL1<WriteMUL64Lo>; |
| def : M4UnitL1<WriteMUL16>; |
| def : M4UnitL1<WriteNoop>; |
| def : M4UnitL1<WritePreLd>; |
| def : M4UnitL1I<(instregex "(t|t2)MOV")>; |
| def : M4UnitL1I<(instrs COPY)>; |
| def : M4UnitL1I<(instregex "t2IT", "t2MSR", "t2MRS")>; |
| def : M4UnitL1I<(instregex "t2CLREX")>; |
| def : M4UnitL1I<(instregex "t2SEL", "t2USAD8", "t2SML[AS]", |
| "t2(S|Q|SH|U|UQ|UH|QD)(ADD|ASX|SAX|SUB)", "t2USADA8", "(t|t2)REV")>; |
| |
| // These instructions are not of much interest to scheduling as they will not |
| // be generated or it is not very useful to schedule them. They are here to make |
| // the model more complete. |
| def : M4UnitL1I<(instregex "t2CDP", "t2LDC", "t2MCR", "t2MRC", "t2MRRC", "t2STC")>; |
| def : M4UnitL1I<(instregex "tCPS", "t2ISB", "t2DSB", "t2DMB", "t2?HINT$")>; |
| def : M4UnitL1I<(instregex "t2?UDF$", "tBKPT", "t2DBG")>; |
| def : M4UnitL1I<(instregex "t?2?Int_eh_sjlj_", "tADDframe", "t?ADJCALL")>; |
| def : M4UnitL1I<(instregex "CMP_SWAP", "JUMPTABLE", "MEMCPY")>; |
| def : M4UnitL1I<(instregex "VSETLNi32", "VGETLNi32")>; |
| |
| def : ReadAdvance<ReadALU, 0>; |
| def : ReadAdvance<ReadALUsr, 0>; |
| def : ReadAdvance<ReadMUL, 0>; |
| def : ReadAdvance<ReadMAC, 0>; |
| |
| // Most FP instructions are single-cycle latency, except MAC's, Div's and Sqrt's. |
| // Loads still take 2 cycles. |
| |
| def : M4UnitL1<WriteFPCVT>; |
| def : M4UnitL1<WriteFPMOV>; |
| def : M4UnitL1<WriteFPALU32>; |
| def : M4UnitL1<WriteFPALU64>; |
| def : M4UnitL1<WriteFPMUL32>; |
| def : M4UnitL1<WriteFPMUL64>; |
| def : M4UnitL2I<(instregex "VLD")>; |
| def : M4UnitL1I<(instregex "VST")>; |
| def : M4UnitL3<WriteFPMAC32>; |
| def : M4UnitL3<WriteFPMAC64>; |
| def : M4UnitL14<WriteFPDIV32>; |
| def : M4UnitL14<WriteFPDIV64>; |
| def : M4UnitL14<WriteFPSQRT32>; |
| def : M4UnitL14<WriteFPSQRT64>; |
| def : M4UnitL1<WriteVLD1>; |
| def : M4UnitL1<WriteVLD2>; |
| def : M4UnitL1<WriteVLD3>; |
| def : M4UnitL1<WriteVLD4>; |
| def : M4UnitL1<WriteVST1>; |
| def : M4UnitL1<WriteVST2>; |
| def : M4UnitL1<WriteVST3>; |
| def : M4UnitL1<WriteVST4>; |
| def : M4UnitL1I<(instregex "VMOVS", "FCONSTS", "VCMP", "VNEG", "VABS")>; |
| def : M4UnitL2I<(instregex "VMOVD")>; |
| def : M4UnitL1I<(instregex "VMRS", "VMSR", "FMSTAT")>; |
| |
| def : ReadAdvance<ReadFPMUL, 0>; |
| def : ReadAdvance<ReadFPMAC, 0>; |
| |
| } |
