[llvm-mca] Move the routine that computes processor resource masks to its own file.
Function computeProcResourceMasks is used by the ResourceManager (owned by the
Scheduler) to compute resource masks for processor resources. Before this
refactoring, there was an implicit dependency between the Scheduler and the
InstrBuilder. That is because InstrBuilder has to know about resource masks when
computing the set of processor resources consumed by a new instruction.
With this patch, the functionality that computes resource masks has been
extracted from the ResourceManager, and moved to a separate file (Support.h).
This helps removing the dependency between the Scheduler and the InstrBuilder.
No functional change intended.
llvm-svn: 327973
diff --git a/llvm/tools/llvm-mca/Support.cpp b/llvm/tools/llvm-mca/Support.cpp
new file mode 100644
index 0000000..a0e0f59
--- /dev/null
+++ b/llvm/tools/llvm-mca/Support.cpp
@@ -0,0 +1,52 @@
+//===--------------------- 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 backend
+/// 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++;
+ }
+}
+} // namespace mca