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Add << prefix to force 5 bit offsets in indexed modes Rounding out the compliment of operand size prefixes, we now have "<<" to mean "force 5 bits". According to Steve Bjork, this was the "official" way to do this since 1980. However, I have no official Motorola source for that. It does suggest that the choice of "<<" is consistent with other (historical) assemblers, though. Either way, it seems the most logical choice while avoiding any conflicts with legal source code, so "<<" it is.
author William Astle <lost@l-w.ca>
date Mon, 23 Jul 2018 17:45:18 -0600
parents cad5937314cb
children a71206ed966c
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>3.12. Cycle Counts</A
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>&#13;The following options for displaying cycle counts in listings are provided.
These options are enabled from pragmas on the command line or in the
assembly files themselves.  For compatibility with other assemblers you can
use the "OPT" keyword in addition to "PRAGMA."</P
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>opt c  - enable cycle counts: [8]
opt cd - enable detailed cycle counts breaking down addressing modes: [5+3]
opt ct - show a running subtotal of cycles
opt cc - clear the running subtotal</PRE
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>&#13;The assembler supports both 6809 as well as native-mode 6309 cycle counts.
In 6309 mode the counts are displayed in parenthesis instead of brackets. 
In addition, some operations have a variable cycle count.  In this case a
"+?" is displayed to alert the reader.  Sample output is shown below.</P
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>266f 7d25e2     (window.asm):00313 [7]     7       move   tst   putflg
2672 2602       (window.asm):00314 [5]     12             bne   a@
2674 1e13       (window.asm):00315 [8]     20             exg   x,u
2676 0dd6       (window.asm):00316 [6]     26      a@     tst   is6309
2678 2618       (window.asm):00317 [5]     31             bne   exit@
                (window.asm):00318                        opt   6309
267a 10860085   (window.asm):00319 (4)     35      b@     ldw   #133
267e 113813     (window.asm):00320 (6+?)   41             tfm   x+,u+
2681 30881b     (window.asm):00321 (4+1)   46             leax  27,x
2684 33c81b     (window.asm):00322 (4+1)   51             leau  27,u
2687 4a         (window.asm):00323 (1)     52             deca
2688 26f0       (window.asm):00324 (5)     57             bne   b@</PRE
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