Read max classical register width from backend info (#458)

CQCL · Jul 12, 2024 · 597eebc · 597eebc
1 parent 73bea9f
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diff --git a/docs/changelog.rst b/docs/changelog.rst
@@ -1,6 +1,11 @@
 Changelog
 ~~~~~~~~~
 
+Unreleased
+----------
+
+* Determine maximum classical register width from backend info.
+
 0.36.0 (July 2024)
 ------------------
 

diff --git a/pytket/extensions/quantinuum/backends/quantinuum.py b/pytket/extensions/quantinuum/backends/quantinuum.py
@@ -1025,9 +1025,13 @@ def process_circuits(
                     quantinuum_circ = circuit_to_qasm_str(
                         c0,
                         header="hqslib1",
-                        maxwidth=32,
-                        # TODO Get maxwidth from self.backend_info once
-                        # https://github.com/CQCL/tket/issues/1445 fixed in pytket
+                        maxwidth=(
+                            self.backend_info.misc.get(
+                                "max_classical_register_width", 32
+                            )
+                            if self.backend_info
+                            else 32
+                        ),
                     )
                     used_scratch_regs = _used_scratch_registers(quantinuum_circ)
                     for name, count in Counter(