Re: [PATCH 13/15] x86: add cmpxchg_flag() variant

[Christoph Lameter]

On Tue, 23 Aug 2011, H. Peter Anvin wrote:

> I keep meaning to write up a proposal for the gcc people to output
> arithmetic flag status.

Should be relatively straightforward if you make the processor flag a
builtin variable.

i.e. __processor_flag_zero, __processor_flag__gt etc.

Then the inline cmpxchg functions could simply do a

	return __processor_flag_zero;

The code generator then needs to realize from the expression that we are
referring to the zero flag and insert the correct jxx instruction.
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