[LLVMbugs] [Bug 5300] New: UNREACHABLE executed at SimpleRegisterCoalescing.cpp:2000!

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=5300

           Summary: UNREACHABLE executed at
                    SimpleRegisterCoalescing.cpp:2000!
           Product: new-bugs
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu


regehr at john-home:~/volatile/tmp214$ clang -w -O3 small.c
No copies from the RHS?
UNREACHABLE executed at SimpleRegisterCoalescing.cpp:2000!
0   clang-cc 0x090906f8
Stack dump:
0.      Program arguments:
/home/regehr/z/tmp/llvm-gcc-r85015-install/bin/../libexec/clang-cc -triple
i386-pc-linux-gnu -S -disable-free -main-file-name small.c --relocation-model
static --disable-fp-elim --unwind-tables=0 --mcpu=pentium4 --fmath-errno=1 -O3
-w -fexceptions=0 -fdiagnostics-show-option -o /tmp/cc-8nFvuk.s -x c small.c 
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'Simple Register Coalescing' on function '@func_31'
clang: error: compiler command failed due to signal 6 (use -v to see
invocation)

regehr at john-home:~/volatile/tmp214$ clang -v

clang version 1.1 (trunk 85015)
Target: i386-pc-linux-gnu
Thread model: posix

regehr at john-home:~/volatile/tmp214$ cat small.c

static unsigned char
bar (char _si1, unsigned char _si2)
{
  return _si1 && _si1 + _si1 ? _si1 : _si1 * _si2;
}

static unsigned char
foo (long long _si1, unsigned char _si2)
{
  return _si2 ? 0 : (_si1 % _si2);
}

unsigned char g_43;
unsigned char *g_133;
unsigned char g_288;
unsigned char g_296;
unsigned char **
func_31 (int **int8p_33, unsigned char **p_34, unsigned char *p_35)
{
  unsigned char l_287;
  short *l_289 = &g_288;
  unsigned char *l_297 = &g_296;
  *l_289 = func_36 (&l_287, 0);
  *l_297 =
    *l_289 < foo (func_36 (&g_133, 0), bar (*l_289, *l_289)) ^ *l_289 >= 1;
}

int
func_36 (int **p_37, unsigned char *p_38, unsigned char **uint32p_40,
         unsigned char *p_41)
{
  unsigned char l_42 = 0xEBL;
  short *l_44 = &g_43;
  unsigned char l_270;
  unsigned char *l_286 = &l_270;
  *l_44 = l_42 <= *l_44;
  if (*l_44)
    return *l_44;
  return *l_286;
}


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