[LLVMbugs] [Bug 9823] New: Assertion `SegStart >= Intf.last() && "Couldn't avoid interference"' failed.

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9823

           Summary: Assertion `SegStart >= Intf.last() && "Couldn't avoid
                    interference"' failed.
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu, chenyang at cs.utah.edu


regehr at home:~/volatile/bugs/tmp024$ clang -c -O -w small.c
clang: RegAllocGreedy.cpp:799:
void<unnamed>::RAGreedy::splitAroundRegion(llvm::LiveInterval&,
<unnamed>::RAGreedy::GlobalSplitCandidate&,
llvm::SmallVectorImpl<llvm::LiveInterval*>&): Assertion `SegStart >=
Intf.last() && "Couldn't avoid interference"' failed.
0  clang 0x09643c58
Stack dump:
0.    Program arguments:
/mnt/z/z/compiler-install/llvm-gcc-r130662-install/bin/clang -cc1 -triple
i386-pc-linux-gnu -emit-obj -disable-free -main-file-name small.c
-mrelocation-model static -mdisable-fp-elim -masm-verbose -mconstructor-aliases
-target-cpu pentium4 -target-linker-version 2.20.51 -momit-leaf-frame-pointer
-resource-dir
/mnt/z/z/compiler-install/llvm-gcc-r130662-install/bin/../lib/clang/3.0 -O2 -w
-ferror-limit 19 -fmessage-length 80 -fgnu-runtime -fdiagnostics-show-option
-fcolor-diagnostics -o small.o -x c small.c 
1.    <eof> parser at end of file
2.    Code generation
3.    Running pass 'Function Pass Manager' on module 'small.c'.
4.    Running pass 'Greedy Register Allocator' on function '@func_64'
clang: error: unable to execute command: Aborted
clang: error: clang frontend command failed due to signal 1 (use -v to see
invocation)

regehr at home:~/volatile/bugs/tmp024$ clang -v

clang version 3.0 (trunk 130662)
Target: i386-pc-linux-gnu
Thread model: posix

regehr at home:~/volatile/bugs/tmp024$ cat small.c


int safe_4 (int si1, int si2)
{
  return si2 && (1 / si1) ? si1 : si2;
}

int safe_6 (char si1, char si2)
{
  return si2 == 0 || si1 && si2 == 1 ? si1 : 1;
}

int safe_26 (int si1, int si2)
{
  return si2 ? si1 : (si1 / si2);
}

int safe_55 (int ui1, int ui2)
{
  return ui1;
}

int g_3;
int g_301;
int g_382;

int func_64 (int p_65, int p_67)
{
  int l_79;
  int l_357;
  for (l_357 = 0; l_357 <= 0; l_357 = 1)
    if (p_67)
      break;
  for (l_79 = 0; l_79 <= 0; l_79 += 1)
    if (safe_6
    (safe_26 (safe_55 (g_301 >= 1, 0), safe_4 (g_3, p_65)), l_357)
    || g_301)
      for (; g_382; g_382 -= 1);
  return 0;
}

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