[Bug gas/6957] i386 NOPs must be derived from march not mtune

[hjl dot tools at gmail dot com]

------- Additional Comments From hjl dot tools at gmail dot com  2008-10-12 
21:30 -------
(In reply to comment #9)
> Sorry but how can PROCESSOR_UNKNOWN mean it can run any instructions? It's
> unknown! Therefore we must use lowest common denominator to expect it to work 
> on
> all CPUs.

If we do that, x86 assembler won't take any SSE instructions by default.
It will break gcc.

> Tune means scheduling.
> Arch means instructions.

That is true.

> 
> Test case. Pass -march=i486 and -mtune=i686 and it'll use alt_long_patt which
> won't work on i486. Fail.

Where is the testcase?


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http://sourceware.org/bugzilla/show_bug.cgi?id=6957

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