diff --git a/osaca/data/isa/aarch64.yml b/osaca/data/isa/aarch64.yml
index 44fb2f8..b12ccd1 100644
--- a/osaca/data/isa/aarch64.yml
+++ b/osaca/data/isa/aarch64.yml
@@ -90,3 +90,29 @@ instruction_forms:
           post-indexed: "*"
           source: false
           destination: true
+    - name: cmp
+      operands:
+        - class: "register"
+          prefix: "*"
+          source: true
+          destination: false
+        - class: "register"
+          prefix: "*"
+          source: true
+          destination: false
+    - name: cmp
+      operands:
+        - class: "register"
+          prefix: "*"
+          source: true
+          destination: false
+        - class: "memory"
+          prefix: "*"
+          base: "*"
+          offset: "*"
+          index: "*"
+          scale: "*"
+          pre-indexed: "*"
+          post-indexed: "*"
+          source: true
+          destination: false
diff --git a/osaca/semantics/marker_utils.py b/osaca/semantics/marker_utils.py
index 42cb923..f47c147 100755
--- a/osaca/semantics/marker_utils.py
+++ b/osaca/semantics/marker_utils.py
@@ -23,6 +23,8 @@ def reduce_to_section(kernel, isa):
         raise ValueError('ISA not supported.')
     if start == -1:
         start = 0
+    if end == -1:
+        end = len(kernel)
     return kernel[start:end]