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Hi again,

On Monday, February 15, 2016 at 8:11:49 PM UTC-6, Ozkan Sezer (sezeroz AT spam DOT no) [via djgpp AT spam DOT no] wrote:
> 
> AFAICS, it is from quake's d_copy.s assembler source.

The actual file should've been named d_copy.S (capital S) since it
uses the preprocessor (to #include three *.h files and #define
stuff). The file makefile.linux seems to use "-x assembler-with-cpp"
to guarantee this.

The actual line (137) is this:

"	rep/movsl	(%esi),(%edi)"

... which is really this: "<tab>rep/movsl<tab>(%esi),(%edi)"

But even more curious is that the file has copious line comments
starting with "//". So if I had to guess, it's that GAS is (now)
confusing the rest of the instruction as a comment.

A quick diff (on objdump output) shows this:

-   dd: f3 a5       rep movs DWORD PTR es:[edi],DWORD PTR ds:[esi]
-   df: 01 c6       add    esi,eax
-   e1: 01 d7       add    edi,edx
-   e3: 4d          dec    ebp
+   dd: f3 01 c6    repz add esi,eax
+   e0: 01 d7       add    edi,edx
+   e2: 4d          dec    ebp

Notice that the "a5" is completely omitted, thus causing it to
combine with the next instruction?

Hmmm, no, "gcc -E -c" still shows "rep/movsl (%esi),(%edi)".

Checking /dev/env/DJDIR/share/info/as.info ...

9.15 80386 Dependent Features
9.15.3.2 Special Characters

"
   If the `--divide' command line option has not been specified then
the `/' character appearing anywhere on a line also introduces a line
comment.
"

But 2.25.1's as.info says the same. So if this differs from 2.25.1,
maybe they finally "fixed" it to do what the doc says.

(A quick check of 2.19 info doc seems to imply similar, but it also
almost seems to imply that '/' would only be a valid comment at the
beginning of a line.)

Weird stuff.  :-P