From 1f6e358d89bfa94e3f0b72a3365d1bcf5a893e6a Mon Sep 17 00:00:00 2001
From: Camil Staps
Date: Mon, 19 Sep 2016 09:50:25 +0200
Subject: Log 2016-09-18: vim plugin, question

---
 log.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/log.md b/log.md
index 939ce1a..239be90 100644
--- a/log.md
+++ 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)
-- 
cgit v1.2.3