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[Bug gas/6957] i386 NOPs must be derived from march not mtune
From: |
hjl dot tools at gmail dot com |
Subject: |
[Bug gas/6957] i386 NOPs must be derived from march not mtune |
Date: |
12 Oct 2008 21:30:41 -0000 |
------- 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?
--
http://sourceware.org/bugzilla/show_bug.cgi?id=6957
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- [Bug gas/6957] New: i386 NOPs must be derived from march not mtune, swanson at ukfsn dot org, 2008/10/11
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, swanson at ukfsn dot org, 2008/10/11
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, hjl dot tools at gmail dot com, 2008/10/11
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, swanson at ukfsn dot org, 2008/10/12
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, hjl dot tools at gmail dot com, 2008/10/12
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, hjl dot tools at gmail dot com, 2008/10/12
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, swanson at ukfsn dot org, 2008/10/12
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, hjl dot tools at gmail dot com, 2008/10/12
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, hjl dot tools at gmail dot com, 2008/10/12
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, swanson at ukfsn dot org, 2008/10/12
- [Bug gas/6957] i386 NOPs must be derived from march not mtune,
hjl dot tools at gmail dot com <=
- [Bug gas/6957] i386 NOPs must be derived from march not mtune, hjl dot tools at gmail dot com, 2008/10/12