[LLVMbugs] [Bug 5183] New: call to func optimized out at -O2

bugzilla-daemon at cs.uiuc.edu bugzilla-daemon at cs.uiuc.edu
Tue Oct 13 13:12:20 PDT 2009


           Summary: call to func  optimized out at -O2
           Product: clang
           Version: unspecified
          Platform: PC
        OS/Version: FreeBSD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: LLVM Codegen
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: rdivacky at freebsd.org
                CC: llvmbugs at cs.uiuc.edu

Created an attachment (id=3653)
 --> (http://llvm.org/bugs/attachment.cgi?id=3653)
test case

the attached testcase is basically:

  func_ptr *p;
  for (p = __CTOR_END__ - 1; *p != (func_ptr) -1; p--)
    (*p) ();

which clang -O2 compiles to:

        pushl   %ebp
        movl    %esp, %ebp
        xorb    %al, %al
        .align  16
        notb    %al
        testb   $1, %al
        movb    $0, %al
        jne     .LBB1_2
        popl    %ebp

note that there is no call to the function... gcc generates the call

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