improved "turbo" decompressor

README.md

@@ -20,7 +20,7 @@ Afterwards you can choose a decompressor routine in assembly Z80, according to
 your requirements for speed and size:
 
 * "Standard" routine: 70 bytes only
-* "Turbo" routine: 130 bytes, about 20% faster
+* "Turbo" routine: 128 bytes, about 20% faster
 * "Mega" routine: 562 bytes, about 25% faster
 
 Finally compile the chosen decompressor routine and load the compressed file

z80/dzx0_turbo.asm

@@ -1,6 +1,6 @@
 ; -----------------------------------------------------------------------------
 ; ZX0 decoder by Einar Saukas & introspec
-; "Turbo" version (130 bytes, 20% faster)
+; "Turbo" version (128 bytes, 20% faster)
 ; -----------------------------------------------------------------------------
 ; Parameters:
 ;   HL: source address (compressed data)
@@ -70,9 +70,8 @@ dzx0t_elias:
         add     a, a                    ; interlaced Elias gamma coding
         rl      c
         add     a, a
-        jr      z, dzx0t_elias_reload
         jr      nc, dzx0t_elias
-        ret
+        ret     nz
 dzx0t_elias_reload:
         ld      a, (hl)                 ; load another group of 8 bits
         inc     hl

z80/dzx0_turbo_back.asm

@@ -1,6 +1,6 @@
 ; -----------------------------------------------------------------------------
 ; ZX0 decoder by Einar Saukas & introspec
-; "Turbo" version (129 bytes, 20% faster) - BACKWARDS VARIANT
+; "Turbo" version (127 bytes, 20% faster) - BACKWARDS VARIANT
 ; -----------------------------------------------------------------------------
 ; Parameters:
 ;   HL: last source address (compressed data)
@@ -69,9 +69,8 @@ dzx0tb_elias:
         add     a, a                    ; interlaced Elias gamma coding
         rl      c
         add     a, a
-        jr      z, dzx0tb_elias_reload
         jr      nc, dzx0tb_elias
-        ret
+        ret     nz
 dzx0tb_elias_reload:
         ld      a, (hl)                 ; load another group of 8 bits
         dec     hl