Replace the Radeon GCN GPU family names by more descriptive ones

[• tstellarAMD]

LGTM. Thanks for doing this.

lib/Basic/Targets.cpp

enum GPUKind {
     GK_R600,
     GK_R600_DOUBLE_OPS,
     GK_R700,
     GK_R700_DOUBLE_OPS,
     GK_EVERGREEN,
     GK_EVERGREEN_DOUBLE_OPS,
     GK_NORTHERN_ISLANDS,
     GK_CAYMAN,
-    GK_SOUTHERN_ISLANDS,
-    GK_SEA_ISLANDS,
-    GK_VOLCANIC_ISLANDS
+    GK_GFX6,
+    GK_GFX7,
+    GK_GFX8
   } GPU;
 
   bool hasFP64:1;
   bool hasFMAF:1;
   bool hasLDEXPF:1;
   bool hasDenormSupport:1;
 
   static bool isAMDGCN(const llvm::Triple &TT) {
     return TT.getArch() == llvm::Triple::amdgcn;
   }
 
 public:
   AMDGPUTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
     : TargetInfo(Triple) ,
-      GPU(isAMDGCN(Triple) ? GK_SOUTHERN_ISLANDS : GK_R600),
+      GPU(isAMDGCN(Triple) ? GK_GFX6 : GK_R600),
       hasFP64(false),
       hasFMAF(false),
       hasLDEXPF(false),
       hasDenormSupport(false){
     if (getTriple().getArch() == llvm::Triple::amdgcn) {
       hasFP64 = true;
       hasFMAF = true;
       hasLDEXPF = true;
return llvm::StringSwitch<GPUKind>(Name)
       .Case("caicos",   GK_NORTHERN_ISLANDS)
       .Case("cayman",   GK_CAYMAN)
       .Case("aruba",    GK_CAYMAN)
       .Default(GK_NONE);
   }
 
   static GPUKind parseAMDGCNName(StringRef Name) {
     return llvm::StringSwitch<GPUKind>(Name)
-      .Case("tahiti",    GK_SOUTHERN_ISLANDS)
-      .Case("pitcairn",  GK_SOUTHERN_ISLANDS)
-      .Case("verde",     GK_SOUTHERN_ISLANDS)
-      .Case("oland",     GK_SOUTHERN_ISLANDS)
-      .Case("hainan",    GK_SOUTHERN_ISLANDS)
-      .Case("bonaire",   GK_SEA_ISLANDS)
-      .Case("kabini",    GK_SEA_ISLANDS)
-      .Case("kaveri",    GK_SEA_ISLANDS)
-      .Case("hawaii",    GK_SEA_ISLANDS)
-      .Case("mullins",   GK_SEA_ISLANDS)
-      .Case("tonga",     GK_VOLCANIC_ISLANDS)
-      .Case("iceland",   GK_VOLCANIC_ISLANDS)
-      .Case("carrizo",   GK_VOLCANIC_ISLANDS)
-      .Case("fiji",      GK_VOLCANIC_ISLANDS)
-      .Case("stoney",    GK_VOLCANIC_ISLANDS)
-      .Case("polaris10", GK_VOLCANIC_ISLANDS)
-      .Case("polaris11", GK_VOLCANIC_ISLANDS)
+      .Case("tahiti",    GK_GFX6)
+      .Case("pitcairn",  GK_GFX6)
+      .Case("verde",     GK_GFX6)
+      .Case("oland",     GK_GFX6)
+      .Case("hainan",    GK_GFX6)
+      .Case("bonaire",   GK_GFX7)
+      .Case("kabini",    GK_GFX7)
+      .Case("kaveri",    GK_GFX7)
+      .Case("hawaii",    GK_GFX7)
+      .Case("mullins",   GK_GFX7)
+      .Case("tonga",     GK_GFX8)
+      .Case("iceland",   GK_GFX8)
+      .Case("carrizo",   GK_GFX8)
+      .Case("fiji",      GK_GFX8)
+      .Case("stoney",    GK_GFX8)
+      .Case("polaris10", GK_GFX8)
+      .Case("polaris11", GK_GFX8)
       .Default(GK_NONE);
   }
 
   bool setCPU(const std::string &Name) override {
     if (getTriple().getArch() == llvm::Triple::amdgcn)
       GPU = parseAMDGCNName(Name);
     else
       GPU = parseR600Name(Name);
if (hasFP64)
       Opts.cl_khr_fp64 = 1;
     if (GPU >= GK_EVERGREEN) {
       Opts.cl_khr_byte_addressable_store = 1;
       Opts.cl_khr_global_int32_base_atomics = 1;
       Opts.cl_khr_global_int32_extended_atomics = 1;
       Opts.cl_khr_local_int32_base_atomics = 1;
       Opts.cl_khr_local_int32_extended_atomics = 1;
     }
-    if (GPU >= GK_SOUTHERN_ISLANDS) {
+    if (GPU >= GK_GFX6) {
       Opts.cl_khr_fp16 = 1;
       Opts.cl_khr_int64_base_atomics = 1;
       Opts.cl_khr_int64_extended_atomics = 1;
       Opts.cl_khr_mipmap_image = 1;
       Opts.cl_khr_subgroups = 1;
       Opts.cl_khr_3d_image_writes = 1;
       Opts.cl_amd_media_ops = 1;
       Opts.cl_amd_media_ops2 = 1;
bool AMDGPUTargetInfo::initFeatureMap(
   const std::vector<std::string> &FeatureVec) const {
 
   // XXX - What does the member GPU mean if device name string passed here?
   if (getTriple().getArch() == llvm::Triple::amdgcn) {
     if (CPU.empty())
       CPU = "tahiti";
 
     switch (parseAMDGCNName(CPU)) {
-    case GK_SOUTHERN_ISLANDS:
-    case GK_SEA_ISLANDS:
+    case GK_GFX6:
+    case GK_GFX7:
       break;
 
-    case GK_VOLCANIC_ISLANDS:
+    case GK_GFX8:
       Features["s-memrealtime"] = true;
       Features["16-bit-insts"] = true;
       break;
 
     case GK_NONE:
       return false;
     default:
       llvm_unreachable("unhandled subtarget");