[Patch] 1/3 Add new builtin __builtin_flush_icache().
Mark Mitchell
mark@codesourcery.com
Tue Jul 3 23:55:00 GMT 2007
Paolo Bonzini wrote:
>
>> 1) Rename the new builtin to __builtin_clear_cache (char *beg , char
>> *end), and have it call the function in libgcc if there is not an
>> inline expansion for it?
>
> (And use libgcc's prototype). This would be the cleanest.
>
> This, plus, try to see how __clear_cache could use the definition of the
> builtin.
Paolo, I didn't quite follow your suggestion. So, I'm not sure if I'm
agreeing or disagreeing. :-)
Anyhow, here's my suggestion.
1. The builtin should be:
__builtin___clear_cache (char *beg, char *end)
following the standard convention that the builtin for X is __builtin_X.
2. The default implementation of the builtin should be to call
__clear_cache. That means that users can call __builtin_clear_cache
from their code, on all platforms.
3. Targets which can do something clever can implement the builtin as
they please and can define CLEAR_INSN_CACHE(BEG, END) to expand to
__builtin_clear_cache(BEG, END). On such targets, then, __clear_cache
in libgcc will call the builtin, which we can be assured will not
recursively expand to __clear_cache.
Thanks,
--
Mark Mitchell
CodeSourcery
mark@codesourcery.com
(650) 331-3385 x713
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