[LLVMbugs] [Bug 13028] New: crash with ffsll()

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=13028

             Bug #: 13028
           Summary: crash with ffsll()
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: markokr at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Following code crashes with clang -O2, both 3.0 and trunk, have not trid other
branches.

-----------------------------
extern int ffsll (long long int v);
int test_ffs(void);
int test_ffs(void)
{
         return ffsll(0);
}
-----------------------------

$ clang -O2 -c -o xxx.o xxx.c
clang: /opt/src/llvm/llvm/lib/VMCore/Value.cpp:301: void
llvm::Value::replaceAllUsesWith(llvm::Value *): Assertion `New->getType() ==
getType() && "replaceAllUses of value with new value of different type!"'
failed.
0  clang 0x09b78e9b
Stack dump:
0.    Program arguments: /opt/apps/llvm/bin/clang -cc1 -triple
i386-pc-linux-gnu -emit-obj -disable-free -main-file-name xxx.c
-mrelocation-model static -fmath-errno -masm-verbose -mconstructor-aliases
-target-cpu pentium4 -target-linker-version 2.20.1 -momit-leaf-frame-pointer
-coverage-file xxx.o -resource-dir /opt/apps/llvm/bin/../lib/clang/3.2
-fmodule-cache-path /var/tmp/clang-module-cache -internal-isystem
/usr/local/include -internal-isystem
/opt/apps/llvm/bin/../lib/clang/3.2/include -internal-externc-isystem
/usr/include/i486-linux-gnu -internal-externc-isystem /include
-internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir
/home/marko/src/libusual/test -ferror-limit 19 -fmessage-length 199
-mstackrealign -fgnu-runtime -fobjc-runtime-has-arc -fobjc-runtime-has-weak
-fobjc-fragile-abi -fdiagnostics-show-option -fcolor-diagnostics -o xxx.o -x c
xxx.c 
1.    <eof> parser at end of file
2.    Per-module optimization passes
3.    Running pass 'CallGraph Pass Manager' on module 'xxx.c'.
4.    Running pass 'Simplify well-known library calls' on function '@test_ffs'
clang: error: unable to execute command: Aborted (core dumped)
clang: error: clang frontend command failed due to signal (use -v to see
invocation)
clang: note: diagnostic msg: Please submit a bug report to
http://llvm.org/bugs/ and include command line arguments and all diagnostic
information.
clang version 3.2 (trunk 157759)
Target: i386-pc-linux-gnu
Thread model: posix
clang: note: diagnostic msg: Preprocessed source(s) and associated run
script(s) are located at:
clang: note: diagnostic msg: /tmp/xxx-MhE8IG.i
clang: note: diagnostic msg: /tmp/xxx-MhE8IG.sh

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