C4 Op 13 speedups

2003-06-08 01:14:49 +00:00
parent cc6fd2b622
commit b02607c0e1
1 changed files with 2 additions and 4 deletions
--- a/zsnes/src/cpu/memory.asm
+++ b/zsnes/src/cpu/memory.asm
@@ -2197,23 +2197,21 @@ C4activate:
    pushad
    mov esi,[C4Ram]
    xor eax,eax
-    xor ebx,ebx
    xor ecx,ecx
    mov cx,[esi+1F80h]
    and ecx,1FFh
    movsx ebx,word[CosTable+ecx*2]
    mov ax,[esi+1F83h]
-    imul ebx,2
+    add ebx,ebx
    imul eax,ebx
    sar eax,8
    mov [esi+1F86h],ax
    sar eax,16
    mov [esi+1F88h],al
    xor eax,eax
-    xor ebx,ebx
    movsx ebx,word[SinTable+ecx*2]
    mov ax,[esi+1F83h]
-    imul ebx,2
+    add ebx,ebx
    imul eax,ebx
    sar eax,8
    mov [esi+1F89h],ax