+3$:
+ tstl r7
+ blss 4$
+ rotl #3,r2,r2 ; q = q << 3
+ bicl3 #^XFFFFFFF8,r2,r8 ; q' gets the high bits from q
+ bicl3 #^X00000007,r2,r2
+ bsb 41$
+4$: ; else
+ rotl #2,r2,r2 ; q = q << 2
+ bicl3 #^XFFFFFFFC,r2,r8 ; q' gets the high bits from q
+ bicl3 #^X00000003,r2,r2
+41$:
+ rotl #3,r3,r3 ; r = r << 3
+ bicl3 #^XFFFFFFF8,r3,r6 ; r' gets the high bits from r
+ bicl3 #^X00000007,r3,r3
+ addl r5,r3 ; r = r + l'
+
+ tstl r7
+ bgeq 5$
+ bitl #1,r7
+ beql 5$ ; if d' < 0 && d' & 1
+ subl r2,r3 ; [r',r] = [r',r] - [q',q]
+ sbwc r8,r6
+45$:
+ bgeq 5$ ; while r < 0
+ decl r2 ; [q',q] = [q',q] - 1
+ sbwc #0,r8
+ addl r7,r3 ; [r',r] = [r',r] + d'
+ adwc #0,r6
+ brb 45$
+
+; The return points are placed in the middle to keep a short distance from
+; all the branch points