From 3d799ae7fe6f7f3010bd38573470711c47330ebf Mon Sep 17 00:00:00 2001
From: Irmen de Jong <irmen@razorvine.net>
Date: Sat, 1 Jun 2024 15:03:01 +0200
Subject: [PATCH] todo

---
 docs/source/todo.rst |  4 +++-
 examples/test.p8     | 46 +++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/docs/source/todo.rst b/docs/source/todo.rst
index 428fcb638..90bb59fbc 100644
--- a/docs/source/todo.rst
+++ b/docs/source/todo.rst
@@ -3,7 +3,9 @@ TODO
 
 https://github.com/irmen/prog8/issues/136 (string.find register order issue)
 
-...
+optimize signed byte/word division by powers of 2, it's now using divmod routine.  (also % ?)
+    see inplacemodificationByteVariableWithLiteralval() and inplacemodificationSomeWordWithLiteralval()
+
 
 
 Future Things and Ideas
diff --git a/examples/test.p8 b/examples/test.p8
index 6cd45f85c..af9b00870 100644
--- a/examples/test.p8
+++ b/examples/test.p8
@@ -1,8 +1,52 @@
+%import textio
 %zeropage basicsafe
 %option no_sysinit
 
 main {
     sub start() {
-        cx16.scnsiz(20,8)
+        signed()
+        unsigned()
+    }
+
+    sub signed() {
+        byte @shared bvalue = -100
+        word @shared wvalue = -20000
+
+        bvalue /= 2     ; TODO should be a simple bit shift?
+        wvalue /= 2     ; TODO should be a simple bit shift?
+
+        txt.print_b(bvalue)
+        txt.nl()
+        txt.print_w(wvalue)
+        txt.nl()
+
+        bvalue *= 2
+        wvalue *= 2
+
+        txt.print_b(bvalue)
+        txt.nl()
+        txt.print_w(wvalue)
+        txt.nl()
+    }
+
+    sub unsigned() {
+        ubyte @shared ubvalue = 100
+        uword @shared uwvalue = 20000
+
+        ubvalue /= 2
+        uwvalue /= 2
+
+        txt.print_ub(ubvalue)
+        txt.nl()
+        txt.print_uw(uwvalue)
+        txt.nl()
+
+        ubvalue *= 2
+        uwvalue *= 2
+
+        txt.print_ub(ubvalue)
+        txt.nl()
+        txt.print_uw(uwvalue)
+        txt.nl()
     }
 }