[LLVMbugs] [Bug 7637] New: Adding a GVN pass via LLVMAddGVNPass triggers an assert.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7637

           Summary: Adding a GVN pass via LLVMAddGVNPass triggers an
                    assert.
           Product: new-bugs
           Version: 2.7
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: blood.of.life at gmail.com
                CC: llvmbugs at cs.uiuc.edu


(Apologies for using D here, I can't get C and LLVM playing nicely.)

import llvm.c.Core;
import llvm.c.transforms.Scalar;

void main()
{
    LLVMModuleRef _module = LLVMModuleCreateWithNameInContext("module",
LLVMGetGlobalContext());
    LLVMPassManagerRef fpm = LLVMCreateFunctionPassManagerForModule(_module);
    LLVMAddInstructionCombiningPass(fpm);  /* Works. */
    LLVMAddGVNPass(fpm);  /* Triggers an assert. */
}

Attempting to run the executable results in this:

a.out: /home/bernard/src/llvm-2.7/include/llvm/PassAnalysisSupport.h:53:
llvm::AnalysisUsage& llvm::AnalysisUsage::addRequiredID(const llvm::PassInfo*):
Assertion `ID && "Pass class not registered!"' failed.
Aborted

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