English Amiga Board - View Single Post - Optimizing the 68020+ 32-bit math

Don_Adan · 16 May 2021, 17:42

Anyway, if you need only shortest code, you can use:

Code:

 lea cv(PC),A0
 add.w (A0),D5
 move.l D5,(A0)
 ext.l D5           ; or "and.l #$0000FFFF,D5"
 bsr PR0000
 


 time dc.l 0
 cout dc.l 0
 cv dc.w 0
 buf ds.b 4

But this code is slowest because extra command (lea from PR0000) is called too.

16 May 2021, 17:42	#109
Don_Adan Registered User Join Date: Jan 2008 Location: Warsaw/Poland Age: 55 Posts: 1,960	Anyway, if you need only shortest code, you can use: Code: lea cv(PC),A0 add.w (A0),D5 move.l D5,(A0) ext.l D5 ; or "and.l #$0000FFFF,D5" bsr PR0000 time dc.l 0 cout dc.l 0 cv dc.w 0 buf ds.b 4 But this code is slowest because extra command (lea from PR0000) is called too.