clover/llvm: handle Fixed vs Scalable vectors explicitly starting with llvm-11

This fixes compilation with llvm-13.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/4200
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Francisco Jerez <currojerez@riseup.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9973>

src/gallium/frontends/clover/llvm/compat.hpp

@@ -42,6 +42,7 @@
 #include <llvm/Analysis/TargetLibraryInfo.h>
 #include <llvm/IR/LegacyPassManager.h>
 #include <llvm/IR/LLVMContext.h>
+#include <llvm/IR/Type.h>
 #include <llvm/Linker/Linker.h>
 #include <llvm/Target/TargetMachine.h>
 #include <llvm/Transforms/IPO.h>
@@ -103,6 +104,36 @@ namespace clover {
 #endif
                                                d);
          }
+
+         static inline bool
+         is_scalable_vector(const ::llvm::Type *type)
+         {
+#if LLVM_VERSION_MAJOR >= 11
+            return ::llvm::isa<::llvm::ScalableVectorType>(type);
+#else
+            return false;
+#endif
+         }
+
+         static inline bool
+         is_fixed_vector(const ::llvm::Type *type)
+         {
+#if LLVM_VERSION_MAJOR >= 11
+            return ::llvm::isa<::llvm::FixedVectorType>(type);
+#else
+            return type->isVectorTy();
+#endif
+         }
+
+         static inline unsigned
+         get_fixed_vector_elements(const ::llvm::Type *type)
+         {
+#if LLVM_VERSION_MAJOR >= 11
+            return ::llvm::cast<::llvm::FixedVectorType>(type)->getNumElements();
+#else
+            return ((::llvm::VectorType*)type)->getNumElements();
+#endif
+         }
       }
    }
 }

src/gallium/frontends/clover/llvm/metadata.hpp

@@ -128,8 +128,10 @@ namespace clover {
                      data += "long";
                      break;
                }
-               if (type->isVectorTy())
-                  data += std::to_string(((::llvm::VectorType*)type)->getNumElements());
+               if (compat::is_scalable_vector(type))
+                  throw build_error("hit unexpected scalable vector");
+               if (compat::is_fixed_vector(type))
+                  data += std::to_string(compat::get_fixed_vector_elements(type));
 
             } else {
                ::llvm::raw_string_ostream os { data };