79a1b80af8
This can reduce some vsetvli toggles. This can be done in pre-ra scheduling as we have moved insertion of vsetvli after the first RA. Currently, we override `tryCandidate` and add a new heuristic based on comparison of `vtype`/`vl`. Reviewers: asb, preames, topperc, lukel97, mshockwave, BeMg Reviewed By: mshockwave, lukel97 Pull Request: https://github.com/llvm/llvm-project/pull/95924
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
//===--- RISCVMachineScheduler.h - Custom RISC-V MI scheduler ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Custom RISC-V MI scheduler.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_RISCV_RISCVMACHINESCHEDULER_H
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#define LLVM_LIB_TARGET_RISCV_RISCVMACHINESCHEDULER_H
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#include "RISCVSubtarget.h"
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#include "RISCVVSETVLIInfoAnalysis.h"
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#include "llvm/CodeGen/MachineScheduler.h"
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namespace llvm {
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/// A GenericScheduler implementation for RISCV pre RA scheduling.
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class RISCVPreRAMachineSchedStrategy : public GenericScheduler {
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const RISCVSubtarget *ST;
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RISCV::RISCVVSETVLIInfoAnalysis VIA;
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RISCV::VSETVLIInfo TopInfo;
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RISCV::VSETVLIInfo BottomInfo;
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RISCV::VSETVLIInfo getVSETVLIInfo(const MachineInstr *MI) const;
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bool tryVSETVLIInfo(const RISCV::VSETVLIInfo &TryInfo,
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const RISCV::VSETVLIInfo &CandInfo,
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SchedCandidate &TryCand, SchedCandidate &Cand,
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CandReason Reason) const;
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public:
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RISCVPreRAMachineSchedStrategy(const MachineSchedContext *C)
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: GenericScheduler(C), ST(&C->MF->getSubtarget<RISCVSubtarget>()),
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VIA(ST, C->LIS) {}
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protected:
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bool tryCandidate(SchedCandidate &Cand, SchedCandidate &TryCand,
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SchedBoundary *Zone) const override;
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void enterMBB(MachineBasicBlock *MBB) override;
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void leaveMBB() override;
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void schedNode(SUnit *SU, bool IsTopNode) override;
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};
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} // end namespace llvm
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#endif
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