[LLVMbugs] [Bug 10809] New: volatile read discarded

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=10809

           Summary: volatile read discarded
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: llvmbugs at cs.uiuc.edu


Clang discards the volatile read in this testcase:

  extern int could_be_volatile;
  void foo() {
    *static_cast<volatile int*>(&could_be_volatile);
  }

C++11 [expr]/5 describes this as a discarded-value-expression and explains that
they are to be evaluated. The volatile operation is whitelisted as undergoing
lvalue-to-rvalue conversion because it is an indirection of a volatile typed
object.

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