[clang] [llvm] [clang][SPIR-V] Add support for AMDGCN flavoured SPIRV (PR #89796)

[Joseph Huber via cfe-commits]

================
@@ -54,3 +56,77 @@ void SPIRV64TargetInfo::getTargetDefines(const LangOptions &Opts,
   BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
   DefineStd(Builder, "SPIRV64", Opts);
 }
+
+namespace {
+const AMDGPUTargetInfo AMDGPUTI(llvm::Triple("amdgcn-amd-amdhsa"), {});
+
+} // anonymous namespace
+
+ArrayRef<const char *> SPIRV64AMDGCNTargetInfo::getGCCRegNames() const {
+  return AMDGPUTI.getGCCRegNames();
+}
+
+bool SPIRV64AMDGCNTargetInfo::initFeatureMap(
+    llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef,
+    const std::vector<std::string> &FeatureVec) const {
+  llvm::AMDGPU::fillAMDGPUFeatureMap({}, getTriple(), Features);
+
+  return TargetInfo::initFeatureMap(Features, Diags, {}, FeatureVec);
+}
+
+bool SPIRV64AMDGCNTargetInfo::validateAsmConstraint(
+    const char *&Name, TargetInfo::ConstraintInfo &Info) const {
+  return AMDGPUTI.validateAsmConstraint(Name, Info);
+}
+
+std::string
+SPIRV64AMDGCNTargetInfo::convertConstraint(const char *&Constraint) const {
+  return AMDGPUTI.convertConstraint(Constraint);
+}
+
+ArrayRef<Builtin::Info> SPIRV64AMDGCNTargetInfo::getTargetBuiltins() const {
+  return AMDGPUTI.getTargetBuiltins();
+}
+
+void SPIRV64AMDGCNTargetInfo::getTargetDefines(const LangOptions &Opts,
+                                               MacroBuilder &Builder) const {
+  BaseSPIRVTargetInfo::getTargetDefines(Opts, Builder);
+  DefineStd(Builder, "SPIRV64", Opts);
+
+  Builder.defineMacro("__AMD__");
+  Builder.defineMacro("__AMDGPU__");
+  Builder.defineMacro("__AMDGCN__");
+}
+
+void SPIRV64AMDGCNTargetInfo::setAuxTarget(const TargetInfo *Aux) {
----------------
jhuber6 wrote:

Is `AUX` guaranteed non-null here? I know in the NVPTX target we only have an `Aux` when compiling for CUDA and use that to make sure type widths match up. However, if you have a direct compilation via `--target=nvptx64-nvidia-cuda` it will be null and not used.

https://github.com/llvm/llvm-project/pull/89796