[clang] [llvm] [AMDGPU] Convert AMDGPUResourceUsageAnalysis pass from Module to MF pass (PR #102913)

[Matt Arsenault via cfe-commits]

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@@ -0,0 +1,94 @@
+//===- AMDGPUMCResourceInfo.h ----- MC Resource Info --------------*- C++ -*-=//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+/// \file
+/// \brief MC infrastructure to propagate the function level resource usage
+/// info.
+///
+//===----------------------------------------------------------------------===//
+
+#include "AMDGPUResourceUsageAnalysis.h"
+#include "MCTargetDesc/AMDGPUMCExpr.h"
+
+namespace llvm {
+
+class MCContext;
+class MCSymbol;
+class StringRef;
+class MachineFunction;
+
+class MCResourceInfo {
+public:
+  enum ResourceInfoKind {
+    RIK_NumVGPR,
+    RIK_NumAGPR,
+    RIK_NumSGPR,
+    RIK_PrivateSegSize,
+    RIK_UsesVCC,
+    RIK_UsesFlatScratch,
+    RIK_HasDynSizedStack,
+    RIK_HasRecursion,
+    RIK_HasIndirectCall
+  };
+
+private:
+  int32_t MaxVGPR;
+  int32_t MaxAGPR;
+  int32_t MaxSGPR;
+
+  MCContext &OutContext;
+  bool finalized;
+
+  void assignResourceInfoExpr(int64_t localValue, ResourceInfoKind RIK,
+                              AMDGPUMCExpr::VariantKind Kind,
+                              const MachineFunction &MF,
+                              const SmallVectorImpl<const Function *> &Callees);
+
+  // Assigns expression for Max S/V/A-GPRs to the referenced symbols.
+  void assignMaxRegs();
+
+public:
+  MCResourceInfo(MCContext &OutContext)
+      : MaxVGPR(0), MaxAGPR(0), MaxSGPR(0), OutContext(OutContext),
+        finalized(false) {}
+  void addMaxVGPRCandidate(int32_t candidate) {
+    MaxVGPR = std::max(MaxVGPR, candidate);
+  }
+  void addMaxAGPRCandidate(int32_t candidate) {
+    MaxAGPR = std::max(MaxAGPR, candidate);
+  }
+  void addMaxSGPRCandidate(int32_t candidate) {
+    MaxSGPR = std::max(MaxSGPR, candidate);
+  }
+
+  MCSymbol *getSymbol(StringRef FuncName, ResourceInfoKind RIK);
+  const MCExpr *getSymRefExpr(StringRef FuncName, ResourceInfoKind RIK,
+                              MCContext &Ctx);
+
+  // Resolves the final symbols that requires the inter-function resource info
+  // to be resolved.
+  void Finalize();
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arsenm wrote:

Start with lowercase 

https://github.com/llvm/llvm-project/pull/102913