[llvm] [ELF] Add CPU name detection for CUDA architectures (PR #75964)

[Justin Lebar via llvm-commits]

================
@@ -517,6 +519,73 @@ StringRef ELFObjectFileBase::getAMDGPUCPUName() const {
   }
 }
 
+StringRef ELFObjectFileBase::getNVPTXCPUName() const {
+  assert(getEMachine() == ELF::EM_CUDA);
+  unsigned SM = getPlatformFlags() & ELF::EF_CUDA_SM;
+
+  switch (SM) {
+  // Fermi architecture.
+  case ELF::EF_CUDA_SM20:
+    return "sm_20";
+  case ELF::EF_CUDA_SM21:
+    return "sm_21";
+
+  // Kepler architecture.
+  case ELF::EF_CUDA_SM30:
+    return "sm_30";
+  case ELF::EF_CUDA_SM32:
+    return "sm_32";
+  case ELF::EF_CUDA_SM35:
+    return "sm_35";
+  case ELF::EF_CUDA_SM37:
+    return "sm_37";
+
+  // Maxwell architecture.
+  case ELF::EF_CUDA_SM50:
+    return "sm_50";
+  case ELF::EF_CUDA_SM52:
+    return "sm_52";
+  case ELF::EF_CUDA_SM53:
+    return "sm_53";
+
+  // Pascal architecture.
+  case ELF::EF_CUDA_SM60:
+    return "sm_60";
+  case ELF::EF_CUDA_SM61:
+    return "sm_61";
+  case ELF::EF_CUDA_SM62:
+    return "sm_62";
+
+  // Volta architecture.
+  case ELF::EF_CUDA_SM70:
+    return "sm_70";
+  case ELF::EF_CUDA_SM72:
+    return "sm_72";
+
+  // Turing architecture.
+  case ELF::EF_CUDA_SM75:
+    return "sm_75";
+
+  // Ampere architecture.
+  case ELF::EF_CUDA_SM80:
+    return "sm_80";
+  case ELF::EF_CUDA_SM86:
+    return "sm_86";
+  case ELF::EF_CUDA_SM87:
+    return "sm_87";
+
+  // Ada architecture.
+  case ELF::EF_CUDA_SM89:
+    return "sm_89";
+
+  // Hopper architecture.
+  case ELF::EF_CUDA_SM90:
+    return getPlatformFlags() & ELF::EF_CUDA_ACCELERATORS ? "sm_90a" : "sm_90";
+  default:
+    llvm_unreachable("Unknown EF_CUDA_SM value");
----------------
jlebar wrote:

report_fatal_error?  In some builds llvm_unreachable is UB if executed.

https://github.com/llvm/llvm-project/pull/75964