[LLVMbugs] [Bug 2783] New: likely regression causing ice: Invalid vreg!

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2783

           Summary: likely regression causing ice: Invalid vreg!
           Product: new-bugs
           Version: unspecified
          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


I never saw this error until tonight, and now it is happening quire frequently,
meaning that it most likely is being triggered by a commit that happened during
the last 24 hours.

This is on Ubuntu Hardy on ia32 using r56034.

LLVM is valgrind-clean on this run.

regehr at john-home:~/volatile/tmp30$ llvm-gcc -O1 small.c 
cc1: /home/regehr/llvm/include/llvm/CodeGen/MachineRegisterInfo.h:135: const
llvm::TargetRegisterClass* llvm::MachineRegisterInfo::getRegClass(unsigned int)
const: Assertion `Reg < VRegInfo.size() && "Invalid vreg!"' failed.
small.c:29: internal compiler error: Aborted
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://developer.apple.com/bugreporter> for instructions.

regehr at john-home:~/volatile/tmp30$ cat small.c

typedef unsigned short int uint16_t;
typedef unsigned int uint32_t;
static inline unsigned int
lshift_u_s (unsigned int left, int right)
{
  return left;
}
static inline int
rshift_s_s (int left, int right)
{
  if ((left < 0) || (right < 0) || (right >= sizeof (int)))
    return left;
  return left >> right;
}

uint16_t g_15;
uint32_t
func_3 (uint32_t p_5)
{
  uint32_t l_16;
  uint32_t l_19;
  uint32_t l_22;
  uint32_t l_304;
  func_7 (rshift_s_s
          (((lshift_u_s
             (((1 & g_15) >= ((rshift_u_s (1)) <= 1)) - ((g_15 < 1) >=
                                                         func_20 (1)),
              1)) <= 1), (1 % mod_rhs (1))));
}


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