question of '__builtin_constant_p'

[Rolf Liu]

Hi, all,
When I walk through the source tree of Linux-ppc kernel,
I found a function named '__builtin_constant_p',
but I can't find any info about the usage of it.
I know it is a built-in function provided by GCC.
Who knows the usage of it ? a brief spec is more appreciated!!!
Thanks a lot.

BRs
Rolf Liu
Software Center Motorola China
Global Software Division, Motorola,Inc.
No 2 Dong San Huan Nan Lu (7th Floor)
Chao Yang District, Beijing 100022, P. R. China
Email: rolfl at sc.mcel.mot.com
          A16975 at email.mot.com
Phone: 86-10-65642023            Fax: 86-10-65668458
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