[Mlir-commits] [mlir] [mlir][LLVM] Add the `byte` type to the LLVM dialect (PR #203795)

[Fabian Mora]

Markus =?utf-8?q?Böck?= <markus.boeck02 at gmail.com>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/203795 at github.com>


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@@ -60,6 +60,31 @@ def LLVMArrayType : LLVMType<"LLVMArray", "array", [
   }];
 }
 
+//===----------------------------------------------------------------------===//
+// LLVMByteType
+//===----------------------------------------------------------------------===//
+
+def LLVMByteType : LLVMType<"LLVMByte", "byte", [
+    DeclareTypeInterfaceMethods<DataLayoutTypeInterface,
+                                ["getTypeSizeInBits", "getABIAlignment"]>,
+    VectorElementTypeInterface]> {
+  let summary = "LLVM byte type";
+  let description = [{
+    The ``!llvm.byte` type represents raw memory data in SSA registers, mirroring
+    LLVM's builtin byte type.
+    It should be used when it cannot be determined whether a value holds a
+    pointer or another type at run time, or if the value contains uninitialized
+    or poison data.
+    Unlike integer types, copying byte types preserves all poison bits and the
+    provenance of pointers.
+  }];
+
+  let parameters = (ins "unsigned":$bitWidth);
----------------
fabianmcg wrote:

Per the lang ref, the width can be `Any bit width from 1 bit to 2^23(about 8 million) can be specified.`

https://github.com/llvm/llvm-project/pull/203795