1 files changed, 5 insertions, 4 deletions
diff --git a/cpu_dsl.py b/cpu_dsl.py
index 928681b..070efbe 100755
--- a/cpu_dsl.py
+++ b/cpu_dsl.py
@@ -468,10 +468,11 @@ def _cmpCImpl(prog, params, rawParams, flagUpdates):
 	if needsCarry:
 		size *= 2
 	tmpvar = 'cmp_tmp{sz}__'.format(sz=size)
-	prog.carryFlowDst = tmpvar
-	prog.lastA = params[1]
-	prog.lastB = params[0]
-	prog.lastBFlow = params[0]
+	if flagUpdates:
+		prog.carryFlowDst = tmpvar
+		prog.lastA = params[1]
+		prog.lastB = params[0]
+		prog.lastBFlow = params[0]
 	scope = prog.getRootScope()
 	if not scope.resolveLocal(tmpvar):
 		scope.addLocal(tmpvar, size)