------- Comment #4 from ubizjak at gmail dot com 2007-04-05 12:29 -------
(In reply to comment #2)
> To implement this optimization, some support from assembler is needed. When
> displacement overflows 8bit, assembler should substitute "jecxz" with
> equivalent "test/jmp rel{16,32}" sequence.
Unfortunatelly, test/jmp clobbers flags, and jecxz doesn't. Due to this, and
example in comment #3, we can't reliably generate proposed instructions.
--
ubizjak at gmail dot com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |WONTFIX
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29793
