+ !0 = metadata !{ metadata !1, metadata !2 } ; a list of loop identifiers
+ !1 = metadata !{ metadata !1 } ; an identifier for the inner loop
+ !2 = metadata !{ metadata !2 } ; an identifier for the outer loop
+
+'``llvm.vectorizer``'
+^^^^^^^^^^^^^^^^^^^^^
+
+Metadata prefixed with ``llvm.vectorizer`` is used to control per-loop
+vectorization parameters such as vectorization factor and unroll factor.
+
+``llvm.vectorizer`` metadata should be used in conjunction with ``llvm.loop``
+loop identification metadata.
+
+'``llvm.vectorizer.unroll``' Metadata
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This metadata instructs the loop vectorizer to unroll the specified
+loop exactly ``N`` times.
+
+The first operand is the string ``llvm.vectorizer.unroll`` and the second
+operand is an integer specifying the unroll factor. For example:
+
+.. code-block:: llvm
+
+ !0 = metadata !{ metadata !"llvm.vectorizer.unroll", i32 4 }
+
+Note that setting ``llvm.vectorizer.unroll`` to 1 disables unrolling of the
+loop.
+
+If ``llvm.vectorizer.unroll`` is set to 0 then the amount of unrolling will be
+determined automatically.
+
+'``llvm.vectorizer.width``' Metadata
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+This metadata sets the target width of the vectorizer to ``N``. Without
+this metadata, the vectorizer will choose a width automatically.
+Regardless of this metadata, the vectorizer will only vectorize loops if
+it believes it is valid to do so.
+
+The first operand is the string ``llvm.vectorizer.width`` and the second
+operand is an integer specifying the width. For example:
+
+.. code-block:: llvm
+
+ !0 = metadata !{ metadata !"llvm.vectorizer.width", i32 4 }
+
+Note that setting ``llvm.vectorizer.width`` to 1 disables vectorization of the
+loop.