------- Comment #1 from siarhei dot siamashka at gmail dot com  2008-10-04 
02:48 -------
For -Os optimization, the generated code is much better:

00000000 <unrolled_loop_fn>:
   0:   55                      push   %ebp
   1:   89 e5                   mov    %esp,%ebp
   3:   53                      push   %ebx
   4:   83 ec 04                sub    $0x4,%esp
   7:   8b 5d 08                mov    0x8(%ebp),%ebx
   a:   eb 0a                   jmp    16 <unrolled_loop_fn+0x16>
   c:   e8 fc ff ff ff          call   d <unrolled_loop_fn+0xd>
  11:   e8 fc ff ff ff          call   12 <unrolled_loop_fn+0x12>
  16:   83 eb 02                sub    $0x2,%ebx
  19:   79 f1                   jns    c <unrolled_loop_fn+0xc>
  1b:   80 e3 01                and    $0x1,%bl
  1e:   74 05                   je     25 <unrolled_loop_fn+0x25>
  20:   e8 fc ff ff ff          call   21 <unrolled_loop_fn+0x21>
  25:   5a                      pop    %edx
  26:   5b                      pop    %ebx
  27:   5d                      pop    %ebp
  28:   c3                      ret


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37734

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