[LLVMbugs] [Bug 7537] New: Unable to issue a copy instruction!

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=7537

           Summary: Unable to issue a copy instruction!
           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: regehr at cs.utah.edu
                CC: llvmbugs at cs.uiuc.edu


regehr at john-home:~/volatile/bugs/tmp321$ clang -v
clang version 2.8 (trunk 107352)
Target: i386-pc-linux-gnu
Thread model: posix

regehr at john-home:~/volatile/bugs/tmp321$ clang -O2 small.c -w

clang: InstrEmitter.cpp:807: void
llvm::InstrEmitter::EmitSpecialNode(llvm::SDNode*, bool, bool,
llvm::DenseMap<llvm::SDValue, unsigned int, llvm::DenseMapInfo<llvm::SDValue>,
llvm::DenseMapInfo<unsigned int> >&): Assertion `Emitted && "Unable to issue a
copy instruction!\n"' failed.
0  clang 0x090a4d08
Stack dump:
0.      Program arguments:
/home/regehr/z/compiler-install/llvm-gcc-r107352-install/bin/clang -cc1 -triple
i386-pc-linux-gnu -S -disable-free -main-file-name small.c -mrelocation-model
static -mdisable-fp-elim -mconstructor-aliases -target-cpu pentium4
-resource-dir
/home/regehr/z/compiler-install/llvm-gcc-r107352-install/lib/clang/2.8 -O2 -w
-ferror-limit 19 -fmessage-length 81 -fgnu-runtime -fdiagnostics-show-option
-fcolor-diagnostics -o /tmp/cc-UYgX2i.s -x c small.c 
1.      <eof> parser at end of file
2.      Code generation
3.      Running pass 'X86 DAG->DAG Instruction Selection' on function '@int327'
clang: error: clang frontend command failed due to signal 6 (use -v to see
invocation)

regehr at john-home:~/volatile/bugs/tmp321$ cat small.c

typedef signed char int8_t;
typedef int int32_t;
typedef unsigned short int uint16_t;
static int8_t
safe_mul_func_int8_t_s_s (int8_t si1, int8_t si2)
{
  return si1 * si2;
}

static uint16_t
safe_mul_func_uint16_t_u_u (uint16_t ui1, uint16_t ui2)
{
  return ui1 * ui2;
}

int8_t g_3;
int8_t *g_2 = &g_3;
int8_t g_94;
int8_t *g_99 = &g_94;
int8_t **volatile g = &g_99;

void int327 (int32_t * p_38)
{
  int8_t l_47 = 0x7CC7L;
  safe_mul_func_int8_t_s_s (safe_mul_func_uint16_t_u_u
                            (safe_mul_func_int8_t_s_s (*p_38, l_47), 1), *g_2)
    || safeminus_ ();
lbl_373:{
    *g = safe_mul_func_uint16_t_u_u;
  }
}

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