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[Axiom-developer] [#48 #define unlikely defined in linux/compiler.h] (ne
[Axiom-developer] [#48 #define unlikely defined in linux/compiler.h] (new)
Mon, 24 Jan 2005 18:41:58 -0600
I finally nailed its origin down to /usr/include/linux/compiler.h
In that file, we have
/* Somewhere in the middle of the GCC 2.96 development cycle, we implemented
a mechanism by which the user can annotate likely branch directions and
expect the blocks to be reordered appropriately. Define __builtin_expect
to nothing for earlier compilers. */
#if __GNUC__ == 2 && __GNUC_MINOR__ < 96
#define __builtin_expect(x, expected_value) (x)
#define likely(x) __builtin_expect((x),1)
#define unlikely(x) __builtin_expect((x),0)
Notice that those defines are not guarded by __KERNEL__.
I would suggest that, Axiom spells its C MACROS all in CAPS, and
prefix them with AXIOM_.
Is that workable?
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