[llvm] [X86][Codegen] add sched for lnlp (PR #139446)

[Simon Pilgrim via llvm-commits]

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+//=----- X86SchedLunarlakeP.td - X86 LunarlakeP Scheduling *- 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 machine model for LunarlakeP to support instruction
+// scheduling and other instruction cost heuristics.
+//
+//===----------------------------------------------------------------------===//
+def LunarlakePModel : SchedMachineModel {
+  // LunarlakeP can allocate 8 uops per cycle.
+  // Max micro-ops that may be scheduled per cycle.
+  // Based on Allocator Width
+  let IssueWidth = 8;  
+  // Max micro-ops that can be buffered. 
+  // Based on size of ROB
+  let MicroOpBufferSize = 792;
+  // INT LOAD takes 4 cycles
+  let LoadLatency = 4;
+  let MispredictPenalty = 14;
+  // Latency for microcoded instructions or instructions without latency info.
+  int MaxLatency = 100;
+  // Based on the LSD (loop-stream detector) queue size (ST).
+  // LSD is 200 uops per logical processor in single threaded mode
+  // For SMT 100 uops/thread, LionCove removed SMT in HW.
+  let LoopMicroOpBufferSize = 200;
+  // This flag is set to allow the scheduler to assign a default model to
+  // unrecognized opcodes.
+  let CompleteModel = 0;
+}
+
+let SchedModel = LunarlakePModel in {
+
+// LunarlakeP can issue micro-ops to 18 different ports in one cycle.
+// Lion Cove architectural spec uses port naming that is not sequential
+// for better comprehension we opt for sequential naming since this ports
+// serve logical information for schedule only.
+// 6 INT ALU Ports {P0 to P5}
+def LNLPPort00 : ProcResource<1>;
+def LNLPPort01 : ProcResource<1>;
+def LNLPPort02 : ProcResource<1>;
+def LNLPPort03 : ProcResource<1>;
+def LNLPPort04 : ProcResource<1>;
+def LNLPPort05 : ProcResource<1>;
+// 4 VEC ALU Ports {V0 to V3}
+def LNLPVPort00 : ProcResource<1>;
+def LNLPVPort01 : ProcResource<1>;
+def LNLPVPort02 : ProcResource<1>;
+def LNLPVPort03 : ProcResource<1>;
+// 2 Store Data Ports {P10 to P11}
+def LNLPPort10 : ProcResource<1>;
+def LNLPPort11 : ProcResource<1>;
+// 6 MEM Ports 6 AGU shared with 3 LD, 3 ST
+// AGU LD {P20 to P22}
+def LNLPPort20 : ProcResource<1>;
+def LNLPPort21 : ProcResource<1>;
+def LNLPPort22 : ProcResource<1>;
+// AGU ST {P25 to P27}
+def LNLPPort25 : ProcResource<1>;
+def LNLPPort26 : ProcResource<1>;
+def LNLPPort27 : ProcResource<1>;
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RKSimon wrote:

Add corresponding mappings to X86PfmCounters.td

https://github.com/llvm/llvm-project/pull/139446