[Bug target/31801] [dataflow] undefined reference to `gen_blockage'

[pinskia at gcc dot gnu dot org]

------- Comment #3 from pinskia at gcc dot gnu dot org  2007-05-03 22:00 -------
(In reply to comment #2)
>  there's no mention of "blockage" in the trunk documentation.
HUH?

@cindex @code{blockage} instruction pattern
@item @samp{blockage}

This pattern defines a pseudo insn that prevents the instruction
scheduler from moving instructions across the boundary defined by the
blockage insn.  Normally an UNSPEC_VOLATILE pattern.


Which was added by:
http://gcc.gnu.org/ml/gcc-patches/2007-01/msg02304.html

See also: http://gcc.gnu.org/ml/gcc-patches/2007-02/msg00147.html
Which talks about this change.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31801