Fixed up ENDIAN warning with mingw32. Added ability to disable ucsim and device...

[fw/sdcc] / doc / choices.txt

diff --git a/doc/choices.txt b/doc/choices.txt
index 2e48bae11eb349abc9a22975ea32588b0c48a401..9fa79244d309fd21e6a9d491a227ded83bbf179e 100644 (file)
--- a/doc/choices.txt
+++ b/doc/choices.txt
@@ -86,3 +86,24 @@ PlusIncr on pairs:
        adc     a,b             ; 4
        ld      b,a             ; 4     = 30
 So n <= 5 (1) is better.
+
+Frame pointer:
+It's nice to use HL as the temp register, but what if I used it as the
+frame pointer instead of ix?
+
+Instead of:
+       ld      e,5(ix)         ; 19
+       ld      d,6(ix)         ; 19    = 38
+
+       ld      hl,#5           ; 10
+       add     hl,sp           ; 11
+       ld      e,(hl)          ; 7
+       inc     hl              ; 6
+       ld      d,(hl)          ; 7     = 41
+
+Things get better when you access the same set over, as you get rid
+of the setup.  But they get worse when both ops are on the stack/in
+direct space.  Easiest this way for now.  iy may benifit...
+
+       
+