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Summary: GCNSchedStrategy re-uses most of GenericScheduler, it's just uses a different method to compute the excess and critical register pressure limits. It's not enabled by default, to enable it you need to pass -misched=gcn to llc. Shader DB stats: 32464 shaders in 17874 tests Totals: SGPRS: 1542846 -> 1643125 (6.50 %) VGPRS: 1005595 -> 904653 (-10.04 %) Spilled SGPRs: 29929 -> 27745 (-7.30 %) Spilled VGPRs: 334 -> 352 (5.39 %) Scratch VGPRs: 1612 -> 1624 (0.74 %) dwords per thread Code Size: 36688188 -> 37034900 (0.95 %) bytes LDS: 1913 -> 1913 (0.00 %) blocks Max Waves: 254101 -> 265125 (4.34 %) Wait states: 0 -> 0 (0.00 %) Totals from affected shaders: SGPRS: 1338220 -> 1438499 (7.49 %) VGPRS: 886221 -> 785279 (-11.39 %) Spilled SGPRs: 29869 -> 27685 (-7.31 %) Spilled VGPRs: 334 -> 352 (5.39 %) Scratch VGPRs: 1612 -> 1624 (0.74 %) dwords per thread Code Size: 34315716 -> 34662428 (1.01 %) bytes LDS: 1551 -> 1551 (0.00 %) blocks Max Waves: 188127 -> 199151 (5.86 %) Wait states: 0 -> 0 (0.00 %) Reviewers: arsenm, mareko, nhaehnle, MatzeB, atrick Subscribers: arsenm, kzhuravl, llvm-commits Differential Revision: https://reviews.llvm.org/D23688 llvm-svn: 279995
55 lines
1.9 KiB
C++
55 lines
1.9 KiB
C++
//===-- GCNSchedStrategy.h - GCN Scheduler Strategy -*- C++ -*-------------===//
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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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/// \file
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_AMDGPU_GCNSCHEDSTRATEGY_H
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#define LLVM_LIB_TARGET_AMDGPU_GCNSCHEDSTRATEGY_H
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#include "llvm/CodeGen/MachineScheduler.h"
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namespace llvm {
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class SIRegisterInfo;
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/// This is a minimal scheduler strategy. The main difference between this
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/// and the GenericScheduler is that GCNSchedStrategy uses different
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/// heuristics to determine excess/critical pressure sets. Its goal is to
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/// maximize kernel occupancy (i.e. maximum number of waves per simd).
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class GCNMaxOccupancySchedStrategy : public GenericScheduler {
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SUnit *pickNodeBidirectional(bool &IsTopNode);
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void pickNodeFromQueue(SchedBoundary &Zone, const CandPolicy &ZonePolicy,
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const RegPressureTracker &RPTracker,
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SchedCandidate &Cand);
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void initCandidate(SchedCandidate &Cand, SUnit *SU,
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bool AtTop, const RegPressureTracker &RPTracker,
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const SIRegisterInfo *SRI,
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int SGPRPressure, int VGPRPressure,
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int SGPRExcessLimit, int VGPRExcessLimit,
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int SGPRCriticalLimit, int VGPRCriticalLimit);
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void tryCandidate(SchedCandidate &Cand, SchedCandidate &TryCand,
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SchedBoundary *Zone, const SIRegisterInfo *SRI,
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unsigned SGPRPressure, unsigned VGPRPressure);
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public:
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GCNMaxOccupancySchedStrategy(const MachineSchedContext *C);
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SUnit *pickNode(bool &IsTopNode) override;
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};
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} // End namespace llvm
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#endif // GCNSCHEDSTRATEGY_H
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