[LLVMbugs] [Bug 8244] New: clang integer wrong code bug

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Sep 27 15:58:26 PDT 2010


           Summary: clang integer wrong code bug
           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 gamow ~]$ clang -v
clang version 2.9 (trunk 114808)
Target: x86_64-unknown-linux-gnu
Thread model: posix
[regehr at gamow ~]$ clang -O0 small.c -o small
[regehr at gamow ~]$ ./small
g = -1
[regehr at gamow ~]$ clang -O1 small.c -o small
[regehr at gamow ~]$ ./small
g = 0
[regehr at gamow ~]$ cat small.c
char g = -2;

int printf (const char *format, ...);

func_1 (void)
  int t_7 = g;
  g = (char) (t_7 >> 8U);

main (void)
  func_1 ();
  printf ("g = %d\n", g);
  return 0;

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