From c7ea11bce3184f101543d127b644dad221007fa5 Mon Sep 17 00:00:00 2001
From: "Peter Helcmanovsky (Ped)" <ped@7gods.org>
Date: Wed, 14 Sep 2022 01:44:04 +0200
Subject: [PATCH] z80_unpacker: optimisations: -2B in unpack implementation =
 183B

---
 z80_unpacker/unpack.asm | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/z80_unpacker/unpack.asm b/z80_unpacker/unpack.asm
index d179888..cd2d507 100644
--- a/z80_unpacker/unpack.asm
+++ b/z80_unpacker/unpack.asm
@@ -89,13 +89,12 @@ unpack:
     jr      c,.copy_chunk
 
   ; * extract byte from compressed data (literal)
-    ld      e,1                 ; E = byte = 1
+    inc     c                   ; C = byte = 1 (and also context_index)
 .decode_byte:
-    ld      c,e
     call    decode_bit          ; bit = upkr_decode_bit(byte);
-    rl      e                   ; byte = (byte << 1) + bit;
+    rl      c                   ; byte = (byte << 1) + bit;
     jr      nc,.decode_byte     ; while(byte < 256)
-    ld      a,e
+    ld      a,c
     exx
     ld      (de),a              ; *write_ptr++ = byte;
     inc     de