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diff --git a/tests/stack_machine_add/instructions.s.tcl b/tests/stack_machine_add/instructions.s.tcl
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+#!/usr/bin/env tclsh
+
+source tclasm.tcl
+
+### store 2 values to memory, load them back, add them and store the result
+
+set_sp 0
+
+const 12345678
+store h1EEE0
+const 40302010
+store h1EEE4
+
+const 8
+
+load h1EEE0
+load h1EEE4
+# adding 40302010 to 12345678 should yield 52647688
+add
+# will write to h1EEE0 + 8 = h1EEE8
+store+ h1EEE0
+
+halt