[Driver] Promote SmallSet of enum to a bitset. NFCI.

clang/lib/Driver/ToolChains/Cuda.cpp

@@ -259,13 +259,13 @@ void CudaInstallationDetector::AddCudaIncludeArgs(
 void CudaInstallationDetector::CheckCudaVersionSupportsArch(
     CudaArch Arch) const {
   if (Arch == CudaArch::UNKNOWN || Version == CudaVersion::UNKNOWN ||
-      ArchsWithBadVersion.count(Arch) > 0)
+      ArchsWithBadVersion[(int)Arch])
     return;
 
   auto MinVersion = MinVersionForCudaArch(Arch);
   auto MaxVersion = MaxVersionForCudaArch(Arch);
   if (Version < MinVersion || Version > MaxVersion) {
-    ArchsWithBadVersion.insert(Arch);
+    ArchsWithBadVersion[(int)Arch] = true;
     D.Diag(diag::err_drv_cuda_version_unsupported)
         << CudaArchToString(Arch) << CudaVersionToString(MinVersion)
         << CudaVersionToString(MaxVersion) << InstallPath

clang/lib/Driver/ToolChains/Cuda.h

@@ -15,9 +15,9 @@
 #include "clang/Driver/Tool.h"
 #include "clang/Driver/ToolChain.h"
 #include "llvm/ADT/Optional.h"
-#include "llvm/ADT/SmallSet.h"
 #include "llvm/Support/Compiler.h"
 #include "llvm/Support/VersionTuple.h"
+#include <bitset>
 #include <set>
 #include <vector>
 
@@ -41,7 +41,7 @@ private:
 
   // CUDA architectures for which we have raised an error in
   // CheckCudaVersionSupportsArch.
-  mutable llvm::SmallSet<CudaArch, 4> ArchsWithBadVersion;
+  mutable std::bitset<(int)CudaArch::LAST> ArchsWithBadVersion;
 
 public:
   CudaInstallationDetector(const Driver &D, const llvm::Triple &HostTriple,

clang/lib/Driver/ToolChains/ROCm.h

@@ -13,7 +13,6 @@
 #include "clang/Basic/LLVM.h"
 #include "clang/Driver/Driver.h"
 #include "clang/Driver/Options.h"
-#include "llvm/ADT/SmallSet.h"
 #include "llvm/ADT/SmallString.h"
 #include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/Triple.h"
@@ -103,10 +102,6 @@ private:
            CorrectlyRoundedSqrt.isValid();
   }
 
-  // GPU architectures for which we have raised an error in
-  // CheckRocmVersionSupportsArch.
-  mutable llvm::SmallSet<CudaArch, 4> ArchsWithBadVersion;
-
   void scanLibDevicePath(llvm::StringRef Path);
   void ParseHIPVersionFile(llvm::StringRef V);
   SmallVector<Candidate, 4> getInstallationPathCandidates();
@@ -124,12 +119,6 @@ public:
                                   bool DAZ, bool FiniteOnly, bool UnsafeMathOpt,
                                   bool FastRelaxedMath, bool CorrectSqrt) const;
 
-  /// Emit an error if Version does not support the given Arch.
-  ///
-  /// If either Version or Arch is unknown, does not emit an error.  Emits at
-  /// most one error per Arch.
-  void CheckRocmVersionSupportsArch(CudaArch Arch) const;
-
   /// Check whether we detected a valid HIP runtime.
   bool hasHIPRuntime() const { return HasHIPRuntime; }