[LLVMbugs] [Bug 9022] New: How to set call attributes via C binding?

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9022

           Summary: How to set call attributes via C binding?
           Product: Documentation
           Version: 2.8
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: General docs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: llvm at henning-thielemann.de
                CC: llvmbugs at cs.uiuc.edu


Created an attachment (id=6031)
 --> (http://llvm.org/bugs/attachment.cgi?id=6031)
attempt to set ReadNone attribute at call

I wonder how to set an attribute like readnone to a call.
Attached is a C program where I try to do add the readnone attribute using
LLVMAddInstrAttribute, which seems to be wrong, since this adds the attribute
to the result of the call. The verifier pass thus complains:

Attribute readnone only applies to the function!
  %2 = call readnone double @llvm.exp.f64(double %0)
Attribute readnone only applies to the function!
  %3 = call readnone double @llvm.sin.f64(double %1)
Broken module found, compilation aborted!
Stack dump:
0.      Running pass 'Function Pass Manager' on module '_module'.
1.      Running pass 'Module Verifier' on function '@arithmetic'
Aborted


I also tried LLVMAddAttribute (but as far as I understand this is for
parameters of the surrounding function) and LLVMAddFunctionAttr (but I want to
add to a call, not a function). Both do not work.

How can I add an attribute to a call? Or is this not necessary at all?

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