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-rw-r--r--tools/llvm-mca/Support.cpp79
1 files changed, 0 insertions, 79 deletions
diff --git a/tools/llvm-mca/Support.cpp b/tools/llvm-mca/Support.cpp
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--- a/tools/llvm-mca/Support.cpp
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-//===--------------------- Support.cpp --------------------------*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-/// \file
-///
-/// This file implements a few helper functions used by various pipeline
-/// components.
-///
-//===----------------------------------------------------------------------===//
-
-#include "Support.h"
-#include "llvm/MC/MCSchedule.h"
-
-namespace mca {
-
-using namespace llvm;
-
-void computeProcResourceMasks(const MCSchedModel &SM,
- SmallVectorImpl<uint64_t> &Masks) {
- unsigned ProcResourceID = 0;
-
- // Create a unique bitmask for every processor resource unit.
- // Skip resource at index 0, since it always references 'InvalidUnit'.
- Masks.resize(SM.getNumProcResourceKinds());
- for (unsigned I = 1, E = SM.getNumProcResourceKinds(); I < E; ++I) {
- const MCProcResourceDesc &Desc = *SM.getProcResource(I);
- if (Desc.SubUnitsIdxBegin)
- continue;
- Masks[I] = 1ULL << ProcResourceID;
- ProcResourceID++;
- }
-
- // Create a unique bitmask for every processor resource group.
- for (unsigned I = 1, E = SM.getNumProcResourceKinds(); I < E; ++I) {
- const MCProcResourceDesc &Desc = *SM.getProcResource(I);
- if (!Desc.SubUnitsIdxBegin)
- continue;
- Masks[I] = 1ULL << ProcResourceID;
- for (unsigned U = 0; U < Desc.NumUnits; ++U) {
- uint64_t OtherMask = Masks[Desc.SubUnitsIdxBegin[U]];
- Masks[I] |= OtherMask;
- }
- ProcResourceID++;
- }
-}
-
-double computeBlockRThroughput(const MCSchedModel &SM, unsigned DispatchWidth,
- unsigned NumMicroOps,
- ArrayRef<unsigned> ProcResourceUsage) {
- // The block throughput is bounded from above by the hardware dispatch
- // throughput. That is because the DispatchWidth is an upper bound on the
- // number of opcodes that can be part of a single dispatch group.
- double Max = static_cast<double>(NumMicroOps) / DispatchWidth;
-
- // The block throughput is also limited by the amount of hardware parallelism.
- // The number of available resource units affects the resource pressure
- // distribution, as well as how many blocks can be executed every cycle.
- for (unsigned I = 0, E = SM.getNumProcResourceKinds(); I < E; ++I) {
- unsigned ResourceCycles = ProcResourceUsage[I];
- if (!ResourceCycles)
- continue;
-
- const MCProcResourceDesc &MCDesc = *SM.getProcResource(I);
- double Throughput = static_cast<double>(ResourceCycles) / MCDesc.NumUnits;
- Max = std::max(Max, Throughput);
- }
-
- // The block reciprocal throughput is computed as the MAX of:
- // - (NumMicroOps / DispatchWidth)
- // - (NumUnits / ResourceCycles) for every consumed processor resource.
- return Max;
-}
-
-} // namespace mca