With gcc-4.6 -O1, Python 3.2 works correctly. With gcc-4.6 -O1 -ftree-vectorize, the assertion "assert (new_line - last_line < 255);" fails in PyCode_Optimize().

I think that the problem is in the following loop:
-------------------------------------
#define NOP    9
#define HAVE_ARGUMENT  90  /* Opcodes from here have an argument: */
#define HAS_ARG(op) ((op) >= HAVE_ARGUMENT)
#define CODESIZE(op)  (HAS_ARG(op) ? 3 : 1)

unsigned char *codestr = NULL;
Py_ssize_t codelen;
int *addrmap = NULL;

/* Fixup linenotab */
for (i=0, nops=0 ; i<codelen ; i += CODESIZE(codestr[i])) {
    addrmap[i] = i - nops;
    if (codestr[i] == NOP)
        nops++;
}
-------------------------------------

gcc-4.6 -O1:
-------------------------------------
0x0000000000480991 <+5041>:  mov    %eax,%edx
0x0000000000480993 <+5043>:  sub    %esi,%edx
0x0000000000480995 <+5045>:  mov    %edx,(%r12,%rax,4)
0x0000000000480999 <+5049>:  movzbl 0x0(%rbp,%rax,1),%edx
0x000000000048099e <+5054>:  cmp    $0x9,%dl
0x00000000004809a1 <+5057>:  jne    0x4809a8 <PyCode_Optimize+5064>
0x00000000004809a3 <+5059>:  add    $0x1,%esi
0x00000000004809a6 <+5062>:  jmp    0x4809b2 <PyCode_Optimize+5074>
0x00000000004809a8 <+5064>:  mov    $0x3,%ecx
0x00000000004809ad <+5069>:  cmp    $0x59,%dl
0x00000000004809b0 <+5072>:  ja     0x4809b7 <PyCode_Optimize+5079>
0x00000000004809b2 <+5074>:  mov    $0x1,%ecx
0x00000000004809b7 <+5079>:  add    %rcx,%rax
0x00000000004809ba <+5082>:  cmp    %rax,%rdi
0x00000000004809bd <+5085>:  jg     0x480991 <PyCode_Optimize+5041>
-------------------------------------

gcc-4.6 -O1 -ftree-vectorize
-------------------------------------
0x0000000000480991 <+5041>:  mov    %eax,%ecx
0x0000000000480993 <+5043>:  sub    %edx,%ecx
0x0000000000480995 <+5045>:  mov    %ecx,(%r12,%rax,4)
0x0000000000480999 <+5049>:  movzbl 0x0(%rbp,%rax,1),%ecx
0x000000000048099e <+5054>:  lea    0x1(%rdx),%esi
0x00000000004809a1 <+5057>:  cmp    $0x9,%cl
0x00000000004809a4 <+5060>:  cmovne %edx,%esi
0x00000000004809a7 <+5063>:  cmove  %esi,%edx
0x00000000004809aa <+5066>:  setne  %cl
0x00000000004809ad <+5069>:  movzbl %cl,%ecx
0x00000000004809b0 <+5072>:  lea    0x1(%rax,%rcx,2),%rax
0x00000000004809b5 <+5077>:  cmp    %rax,%rdi
0x00000000004809b8 <+5080>:  jg     0x480991 <PyCode_Optimize+5041>
-------------------------------------