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12a71b7b2e
Summary: This change renames the Backend and BackendPrinter to Pipeline and PipelinePrinter respectively. Variables and comments have also been updated to reflect this change. The reason for this rename, is to be slightly more correct about what MCA is modeling. MCA models a Pipeline, which implies some logical sequence of stages. Reviewers: andreadb, courbet, RKSimon Reviewed By: andreadb, courbet Subscribers: mgorny, javed.absar, tschuett, gbedwell, llvm-commits Differential Revision: https://reviews.llvm.org/D48496 llvm-svn: 335496
59 lines
2.3 KiB
C++
59 lines
2.3 KiB
C++
//===--------------------- Support.h ----------------------------*- 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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/// \file
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///
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/// Helper functions used by various pipeline components.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TOOLS_LLVM_MCA_SUPPORT_H
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#define LLVM_TOOLS_LLVM_MCA_SUPPORT_H
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/MC/MCSchedule.h"
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namespace mca {
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/// Populates vector Masks with processor resource masks.
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///
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/// The number of bits set in a mask depends on the processor resource type.
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/// Each processor resource mask has at least one bit set. For groups, the
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/// number of bits set in the mask is equal to the cardinality of the group plus
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/// one. Excluding the most significant bit, the remaining bits in the mask
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/// identify processor resources that are part of the group.
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///
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/// Example:
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///
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/// ResourceA -- Mask: 0b001
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/// ResourceB -- Mask: 0b010
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/// ResourceAB -- Mask: 0b100 U (ResourceA::Mask | ResourceB::Mask) == 0b111
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///
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/// ResourceAB is a processor resource group containing ResourceA and ResourceB.
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/// Each resource mask uniquely identifies a resource; both ResourceA and
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/// ResourceB only have one bit set.
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/// ResourceAB is a group; excluding the most significant bit in the mask, the
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/// remaining bits identify the composition of the group.
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///
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/// Resource masks are used by the ResourceManager to solve set membership
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/// problems with simple bit manipulation operations.
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void computeProcResourceMasks(const llvm::MCSchedModel &SM,
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llvm::SmallVectorImpl<uint64_t> &Masks);
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/// Compute the reciprocal block throughput from a set of processor resource
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/// cycles. The reciprocal block throughput is computed as the MAX between:
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/// - NumMicroOps / DispatchWidth
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/// - ProcResourceCycles / #ProcResourceUnits (for every consumed resource).
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double computeBlockRThroughput(const llvm::MCSchedModel &SM,
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unsigned DispatchWidth, unsigned NumMicroOps,
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llvm::ArrayRef<unsigned> ProcResourceUsage);
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} // namespace mca
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#endif
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