[LLVMbugs] [Bug 2260] New: sin of omission: load from volatile

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2260

           Summary: sin of omission: load from volatile
           Product: new-bugs
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu


This is observed for llvm + gcc-4.2 version 50368, on Ubuntu Feisty on x86-32.

This input:

volatile int g_1;
void foo (void)
{
  g_1;
}

Compiled like this:

llvm-gcc -O1 -S small.c

Produces:

foo:
        pushl   %ebp
        movl    %esp, %ebp
        popl    %ebp
        ret

It is necessary to load from g_1.


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