Some optimization.

zsnes/src/chips/dsp4emu.c

@@ -2062,8 +2062,6 @@ void InitDSP4()
 
 void DSP4SetByte()
 {
-  if ((dsp4_address & 0xf000) == 0x6000 || (dsp4_address >= 0x8000 && dsp4_address < 0xc000))
-  {    
   // clear pending read
   if (DSP4.out_index < DSP4.out_count)
   {
@@ -2259,13 +2257,10 @@ void DSP4SetByte()
         break;
     }
   }
-  }
 }
 
 void DSP4GetByte()
 {
-  if ((dsp4_address & 0xf000) == 0x6000 || (dsp4_address >= 0x8000 && dsp4_address < 0xc000))
-  {
   if (DSP4.out_count)
   {
     dsp4_byte = (uint8) DSP4.output[DSP4.out_index&0x1FF];
@@ -2277,9 +2272,4 @@ void DSP4GetByte()
   {
     dsp4_byte = 0xff;
   }
-  }
-  else
-  {
-    dsp4_byte = 0x80;
-  }
 }

zsnes/src/chips/dsp4proc.asm

@@ -25,11 +25,25 @@ EXTSYM regaccessbankr16,regaccessbankr8,regaccessbankw16,regaccessbankw8
 
 SECTION .text
 
-NEWSYM DSP4Read8b
+%macro RouteAccess 1
-    test ecx,8000h
+    test ecx,08000h
     jnz .dsp4area
-    jmp regaccessbankr8
+    jmp %1
 .dsp4area
+    mov dx,cx
+    and dx,0C000h
+    cmp dx,08000h
+    je .dsp4continue
+    mov dx,cx
+    and dx,0F000h
+    cmp dx,06000h
+    je .dsp4continue
+    ret
+.dsp4continue
+%endmacro
+
+NEWSYM DSP4Read8b
+    RouteAccess regaccessbankr8
     mov word[dsp4_address],cx
     pushad
     call DSP4GetByte
@@ -38,10 +52,7 @@ NEWSYM DSP4Read8b
     ret
 
 NEWSYM DSP4Write8b
-    test ecx,8000h
+    RouteAccess regaccessbankw8
-    jnz .dsp4area
-    jmp regaccessbankw8
-.dsp4area       
     mov word[dsp4_address],cx
     mov byte[dsp4_byte],al
     pushad
@@ -50,10 +61,7 @@ NEWSYM DSP4Write8b
     ret
     
 NEWSYM DSP4Read16b
-    test ecx,8000h
+    RouteAccess regaccessbankr16    
-    jnz .dsp4area
-    jmp regaccessbankr16
-.dsp4area       
     mov word[dsp4_address],cx
     pushad
     call DSP4GetByte
@@ -67,10 +75,7 @@ NEWSYM DSP4Read16b
     ret
 
 NEWSYM DSP4Write16b
-    test ecx,8000h
+    RouteAccess regaccessbankw16
-    jnz .dsp4area
-    jmp regaccessbankw16
-.dsp4area       
     mov word[dsp4_address],cx
     mov byte[dsp4_byte],al
     mov byte[dsp4temp],ah