X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=doc%2Fchoices.txt;h=1442eca452e5bed8306897b5062f5c87fce84d0b;hb=3c3375d0477d692290f05334d4cb858ee1205369;hp=d6fbe90c9b05b3e43273b0616e16ccffae8c351c;hpb=2ceac874f6c59f9a9ff23d72eb06b5c519ea409c;p=fw%2Fsdcc

diff --git a/doc/choices.txt b/doc/choices.txt
index d6fbe90c..1442eca4 100644
--- a/doc/choices.txt
+++ b/doc/choices.txt
@@ -218,4 +218,25 @@ Cleaning up the arguments to a call:
          pop    af              ; 5/byte
 
 
-So for 8 bytes and above use the first form.
\ No newline at end of file
+So for 8 bytes and above use the first form.
+
+Pointer assign:
+        ld      hl,bc           ; 4+4
+        ld      e,(hl)          ; 7
+        inc     hl              ; 6
+        ld      d,(hl)          ; 7
+
+vs:
+        ld      a,(bc)          ; 7
+        ld      e,a             ; 4
+        inc     bc              ; 6
+        ld      a,(bc)          ; 7
+        ld      d,a             ; 4
+
+Same cost.  Not worth it, although is does free up HL.
+
+Shift left signed on HL
+      sla  l
+      rl   h                    ; 8+8 = 16
+
+      add  hl,hl                ; 11