[avr-libc-dev] [bug #50987] Not all registers need to be declared volatile

[Eric Tang]

URL:
  <http://savannah.nongnu.org/bugs/?50987>

                 Summary: Not all registers need to be declared volatile
                 Project: AVR C Runtime Library
            Submitted by: e_l_tang
            Submitted on: Tue 09 May 2017 08:20:25 PM UTC
                Category: None
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
        Percent Complete: 0%
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 2.0.0
           Fixed Release: None

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Details:

Many registers are no different from a global 8-bit variables in that they
will always contain the values which were last written to them. The compiler
will be able to better optimize code which accesses them if they are not
declared volatile.




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