Log 2016-09-18: vim plugin, question

1 files changed, 9 insertions, 0 deletions

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+++ b/log.md
@@ -3,6 +3,8 @@
 Camil Staps
 
 ### 2016-09-18
+Made a Vim plugin for ABC code highlighting (camilstaps/vim-abc).
+
 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
@@ -16,3 +18,10 @@ Started to make changes to the code generator:
  - 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.
+
+**Question**:
+Is there an interface to get an auxiliary register in the code generator? For
+example, to swap to registers a third is necessary (or the stack, but then the
+PC and SP cannot be modified). In `w_as_jsr_instruction`, the PC is stored on
+the stack, but PC cannot be `Rd` for `str`. Therefore we need an auxiliary
+register (`8c91384` does this for some cases)