[email protected] writes:

> Can anybody explain about the unspec_volatile() rtl template usage, sample
> example and the purpose of it.

unspec_volatile is documented in the gcc internals manual.  There are
many examples of using it in the existing gcc backends.  The purpose
is to permit describing instructions which can not be adequately
expressed in RTL, such as the x86 cld instruction.


> somebody can explain the procedure for gcc debugging ?

http://gcc.gnu.org/wiki/DebuggingGCC


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Ian

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