[LLVMbugs] [Bug 22820] New: Assertion `Val && "isa<> used on a null pointer"' failed

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22820

            Bug ID: 22820
           Summary: Assertion `Val && "isa<> used on a null pointer"'
                    failed
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: alexis.breust at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 13990
  --> http://llvm.org/bugs/attachment.cgi?id=13990&action=edit
Launch script

Hello everyone,

I made a bit of work to track it down to a minimal example.
Here what I came with:

#include <cmath>

void init(const double a) {
    double ua = (a < 0.0)? -a : a;    
    if (ua > 13.0)
        ua = std::fmod(ua, 13.0);
}

int main(void) {
    init(1.0);
    return 0;
}

This produces:

clang: /home/breusta/tmp/llvm/include/llvm/Support/Casting.h:95: static bool
llvm::isa_impl_cl<To, const From*>::doit(const From*) [with To = llvm::MDNode;
>From = llvm::Metadata]: Assertion `Val && "isa<> used on a null pointer"'
failed.
(...)
clang version 3.6.0 (trunk 223924)

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