------- Comment #10 from ubizjak at gmail dot com 2009-04-28 21:53 -------
Actually, alignment is from ix86_avoid_jump_misspredicts, where:
/* Look for all minimal intervals of instructions containing 4 jumps.
The intervals are bounded by START and INSN. NBYTES is the total
size of instructions in the interval including INSN and not including
START. When the NBYTES is smaller than 16 bytes, it is possible
that the end of START and INSN ends up in the same 16byte page.
The smallest offset in the page INSN can start is the case where START
ends on the offset 0. Offset of INSN is then NBYTES - sizeof (INSN).
We add p2align to 16byte window with maxskip 17 - NBYTES + sizeof (INSN).
*/
So, this is by design. Use -Os if code size is important.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39942
