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pmc · 10 July 2008, 13:30

I've got a question about this. If I setup some variables (for want of a better word) like this:

var1: dc.w $1234
var2: dc.l $12345678
var3: dc.l $12345678
var4: dc.b $12
var5: dc.b $34
var6: dc.l $12345678
var7: dc.l $12345678

then link some space:

link a4,#-20

and move the variables into the linked space like this:

move.w var1,(a4)
move.l var2,2(a4)
move.l var3,6(a4)
move.b var4,10(a4)
move.b var5,11(a4)
move.l var6,12(a4)
move.l var7,16(a4)

is it then faster (although, admittedly, less readable) later on in my code to do things like this:

move.l $9abcdef0,2(a4)

instead of things like this:

move.l $9abcdef0,var2

Just curios - I'm trying to work out ways to make code quicker. While I'm on the subject of optimsation, is there a list of optimisations anywhere, such as "instead of clr.l d0, do a moveq.l #0,d0 cos it's faster..."?

10 July 2008, 13:30	#4
pmc gone Join Date: Apr 2007 Location: completely gone Posts: 1,596	I've got a question about this. If I setup some variables (for want of a better word) like this: var1: dc.w $1234 var2: dc.l $12345678 var3: dc.l $12345678 var4: dc.b $12 var5: dc.b $34 var6: dc.l $12345678 var7: dc.l $12345678 then link some space: link a4,#-20 and move the variables into the linked space like this: move.w var1,(a4) move.l var2,2(a4) move.l var3,6(a4) move.b var4,10(a4) move.b var5,11(a4) move.l var6,12(a4) move.l var7,16(a4) is it then faster (although, admittedly, less readable) later on in my code to do things like this: move.l $9abcdef0,2(a4) instead of things like this: move.l $9abcdef0,var2 Just curios - I'm trying to work out ways to make code quicker. While I'm on the subject of optimsation, is there a list of optimisations anywhere, such as "instead of clr.l d0, do a moveq.l #0,d0 cos it's faster..."?