On Sat, 28 Jun 2008, Marius Strobl wrote:
On Fri, Jun 27, 2008 at 09:58:31PM +0200, Christoph Mallon wrote:
This approach seems wrong to me and I think it works only by chance. The
I wasn't aware that the clobber list allows to explicitly specify
the condition codes, thanks for the hint. Though it unfortunately
took me longer than two days to verify it's effect on the generated
code; sparc64 could still have been one of the archs where "cc" has
no effect.
I think it still only works by chance.
Besides I don't think using "__volatile" for this is
that wrong, given that the sparc64 code generated by using "cc"
and "__volatile" is nearly identical and given that at least i386
relies on "__volatile" telling GCC that the inline assembler uses
the condition codes since quite some time. So the condition codes
are probably part of what GCC treats as "important side-effects".
No, the comments in the i386 version are rotted bits left over from
old failing attempts to fix this problem.
Bruce
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