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+# Bachelor thesis logbook
+
+Camil Staps
+
+### 2016-09-18
+ARM/Thumb-2 mode switches are expensive, and since a Clean program continuously
+switches between the RTS and the program itself, it is not viable to have the
+RTS run in ARM mode and the code generator generate Thumb-2 code. Hence, I
+started to rewrite the RTS for Thumb-2. Mostly minor, trivial changes:
+
+ - Invisible registers for some instructions (auxiliary register needed)
+
+Started to make changes to the code generator:
+
+ - Added `.thumb`, `.syntax unified` to the top of each generated file
+ - Added `.thumb_func` before each code label
+ - Fix for the `str pc,[sp,#-4]!` and similar instructions, since `pc` cannot
+   be the `Rd` operand in a `str` instruction: copy to scratch register first.